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Seismic?Performance?of?Chorded?Steel-Concrete?Composite?Arch?Bridge ZHOU Zhi-xiang, XU Yong, , GAO Yan-mei 2009, 28(4): 641-645.  DOI: 10.3969/j.issn.1674-0696.2009.04.01 Abstract ( )   PDF (1331KB) ( )   The?basic?conception?of?a?chorded?steel-concrete?composite?arch?bridge?is?introduced.?And?its?dynamic?characteristics?and?structural?performances?are?discussed.?Its?response?to?earthquakes?is?calculated?by?means?of?time-history?analysis?method,?and?the?comparison?of?that?with?the?general?concrete?ribbed?arch?bridges?has?proved?that?the?chorded?steel-concrete?has?a?stronger?resistance?to?earthquakes,?so?it?can?withstand?stronger?earthquake,?comparing?with?the?general?concrete?ribbed?arch?bridges. References | Related Articles | Metrics

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Shaking?Table?Tests?on?Single-Column-Bent?Double-Deck??Viaduct?Pier?Model?-?II?：Structural?Seismic?Response PENG Kai, , LI Jian-zhong, ZHU Yu, GUAN Zhong-guo 2009, 28(4): 646-651.  DOI: 10.3969/j.issn.1674-0696.2009.04.02 Abstract ( )   PDF (2396KB) ( )   On?the?shaking?table?a?series?of?simulative?seismic?waves?are?input?to?simulate?a?single-column-bent?double-deck?viaduct?pier?model?with?structural?seismic?responses,?including?the?horizontal?accelerations?and?displacements,?etc.?The?seismic?bending?moments?at?the?column?base?and?mutation?section?of?pier?are?evaluated,?and?the?developing?trend?of?structural?damage?is?analyzed.?The?results?indicate?that：the?horizontal?seismic?response?of?single-column-bent?double-deck?viaduct?mainly?lies?on?the?contributions?from?the?first?two?free-vibration?modes?in?the?corresponding?direction;during?the?ordinal?input?of?amplitude-modulated?seismic?waves,?damage?index?of?the?cracked?structure?increases?piecewise?linearly?with?magnification?of?the?maximum?seismic?displacements?along?the?key?degrees?of?freedom,?and?levels?off?when?the?expected?plastic?hinge?area?approximates?yielding?state,?then?the?column?cross-section?effective?bending?rigidity?might?be?reasonably?decided?through?sectional?moment-curvature?analysis References | Related Articles | Metrics

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Mechanic?Characteristics?of?Multi-Cell?Box?Girder?with?Corrugated?Steel?Webs ZHANG Huanan, HAN Yun, WAN Shui 2009, 28(4): 652-657.  DOI: 10.3969/j.issn.1674-0696.2009.04.03 Abstract ( )   PDF (2484KB) ( )   In?the?engineering?case?of?Weihe?Bridge?in?Henan,?series?of?three-dimensional?models?have?been?generated?,which?adopt?the?finite?element?analysis.?From?the?results,?the?influences?of?parameters?to?girder?transverse?stress?have?been?studied.?The?transverse?stress?under?the?dead?load?and?the?vehicle?load?is?calculated?by?the?finite?element?soft?too.?The?distribution?regularity?of?the?transverse?stress?is?also?discussed?,which?would?be?useful?in?the?design?of?this?kind?of?girder.?It?is?indicated?from?the?results?that?the?middle?of?the?cells?and?the?web?armpits?are?proved?to?be?the?worst?loading?position?in?this?kind?of?girder. References | Related Articles | Metrics

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Crack?Causes?of?Prestressed?Concrete?T?Beam ZHENG Shengbao, CAO Zhengzhou, TAN Ke 2009, 28(4): 658-659.  DOI: 10.3969/j.issn.1674-0696.2009.04.04 Abstract ( )   PDF (410KB) ( )   Erhao-Dongsheng?Highway?Bridge?of?Inner?Monglia?is?a?40?m?multi-span?highway?bridge,?which?has?the?structure?of?simply-supported?continuous?prestressed?T?beams.?In?the?process?of?prefabricating?T?beams,?some?cracks?occur?in?a?few?T?beams.?The?crack?causes?are?analyzed?from?several?aspects,?such?as?mixture?ratio,?temperature?and?support?sedimentation,?and?the?corresponding?counter-measures?are?put?forward. References | Related Articles | Metrics

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Calculation?of?Protective?Layer?Thickness?for?Preventing?Longitudinal?Cracks?of??Prestressed?Concrete?T-Beam FENG Jie-chun, XU Yong, , ZHONG Yun-jian 2009, 28(4): 660-663.  DOI: 10.3969/j.issn.1674-0696.2009.04.05 Abstract ( )   PDF (728KB) ( )   The?causes?of?longitudinal?cracks?of?prestressed?concrete?T-beam?are?discussed.?The?great?transverse?tension?stress?on?the?bottom?floor?caused?by?the?reversed?effect?of?tensional?prestressed?steel?bar?on?up-flexion?of?T-beam?and?the?overlapping?enhancing?Poisson?effect?are?analyzed.?Combining?with?theoretic?analysis?and?numerical?computing?method,?a?formula?is?deduced?to?compute?the?minimum?protective?layer?thickness?of?the?prestressed?pipeline?under?the?disadvantageous?stress References | Related Articles | Metrics

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Reinforcement?Technology?of?Transforming?Rectangular?Rib?Arch?Bridge?into?Box?Rib?Arch?Bridge SHi Fei, ZHOU Jianting, MO Xijing, ZHU Xiaolong, WU Diankun 2009, 28(4): 664-667.  DOI: 10.3969/j.issn.1674-0696.2009.04.06 Abstract ( )   PDF (1319KB) ( )   Taking?Chongqing?Fengdu?Miaobao?Bridge?as?the?antitype,?two?reinforced?concrete?rib?arch?models?are?established.?The?reinforcement?technology?of?transforming?rectangular?rib?arch?bridge?into?box?rib?arch?bridge?is?applied?to?reinforce?one?of?the?models,?and?then?destructive?tests?are?carried?out?on?the?pre-reinforced?model?and?post-reinforced?model.?Through?the?com-?parison?analysis?on?the?conditions?of?the?strain,?deflection,?lateral?load?distribution?ratio,?crack,?failure?mode?and?other?indicators?before?and?after?the?hreinforcement,?the?conclusion?is?drawn?that?the?new?reinforced?concrete?box?can?coordinate?with?the?deformation?with?the?original?rib?and?have?a?common?commitment?to?the?live?load. References | Related Articles | Metrics

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Application?Example?for?New?Strengthening?Technology?of??Changing?T?Beam?into?Box?Beam ZHANG Xi-qiang, LiYi-yu, CHEN Hui 2009, 28(4): 668-670.  DOI: 10.3969/j.issn.1674-0696.2009.04.07 Abstract ( )   PDF (558KB) ( )   Changing?T?beam?into?box?beam?is?a?new?method?to?reinforce?the?bridge?with?T?girder.?To?improve?the?bearing?capacity?of?the?bridge,?the?original?section?is?changed?from?T-section?into?box?section,?using?the?high-strength?bolts?and?to?epoxy?mortar?expansion?paste?plate?in?the?end?of?the?ribs?of?the?T-beam.?This?new?method?makes?good?use?of?anti-bending?ability?and?torsional?rigidity?of?box?beam?;?therefore,?it?achieves?the?target?of?improving?the?overall?performance?significantly?comparing?with?the?traditional?T-beam?technology?theory.?This?new?method?is?advantageous?to?reduce?the?construction?period?,to?simplify?the?construction?process?and?have?no?traffic?disruption.?A?case?study?of?Guiyang?Railway?T-Beam?Bridge?reinforcement?is?provided?to?be?referenced References | Related Articles | Metrics

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Study?on?Load?Test?of?Dayan?River?Bridge GU Ying, HU Xuhui 2009, 28(4): 671-672.  DOI: 10.3969/j.issn.1674-0696.2009.04.08 Abstract ( )   PDF (799KB) ( )   Dayan?River?Bridge?is?a?25?m?simply-supported?highway?bridge?of?box?girder?with?corrugated?steel?webs.?FEM?simulation?analysis?on?Dayan?River?Bridge?is?carried?out?and?the?load?test?of?actual?bridge?is?also?implemented.?The?results?show?that?the?design?and?construction?of?Dayan?River?Bridge?is?safe?and?reliable,which?has?guidance?meaning?for?the?construction?of?similar?bridges. References | Related Articles | Metrics

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Safety?Evaluation?of?Long-Range?Monitoring?of?Bridge?Health??Based?on?Internal?Force?Envelope?Theory LIU Lu, ZHOU Jian-ting, CHEN Xiao-ming 2009, 28(4): 673-675.  DOI: 10.3969/j.issn.1674-0696.2009.04.09 Abstract ( )   PDF (786KB) ( )   The?safety?evaluation?model,?the?resistant?internal?force?diagram?and?real-time?internal?force?diagram?based?on?the?real-time?monitoring?of?a?bridge?as?well?as?the?application?are?expounded.?The?internal?force?envelope?method?in?bridge?design?is?applied?to?the?remote?monitoring?of?bridge?health,?and?a?kind?of?safety?evaluation?method?based?on?internal?force?envelope?theory?is?proposed.?Comparing?with?the?current?method,?this?method?solves?the?problems?that?the?measuring?points?are?limited?and?can＇t?reflect?the?state?of?unmeasured?location?and?the?overall?bridge.?Therefore,?this?method?is?advantageous?to?be?more?intuitive?and?more?objective,?at?the?same?time,?it?does?better?in?overcoming?environmental?and?operational?conditions?and?has?a?promising?application?potential. References | Related Articles | Metrics

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Technology?of?Construction?of?Continuous?Box?Girder?Bearer?of?Xishangou?Bridge?II SUN Shuxue, , HAN Xi, CUi Jing 2009, 28(4): 676-679.  DOI: 10.3969/j.issn.1674-0696.2009.04.10 Abstract ( )   PDF (733KB) ( )   The?bearer?structures?of?casting?girder?bridges?in?place?are?various?and?proper?bearer?structure?can?ensure?the?safety?and?quality?of?construction.?Taking?the?design?and?construction?of?casting?30m?bearer?of?Xishangou?Bridge?U?as?case?study,?the?principle?is?demonstrated?;?secondly,?the?proper?construction?structure?should?be?applied?with?the?full?consideration?of?the?influence?of?bearer?sedimentation;?and?during?the?construction,?experiment?measures,?such?as?pre-pressing?are?applied?to?eliminate?the?non-elastic?deformation?and?to?detect?elastic?deformation?of?the?bearer. References | Related Articles | Metrics

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Investigation?on?Construction?Process?of?Shed-Tunnel?and?Its?Application GAO Feng, WU Chen-yu 2009, 28(4): 680-684.  DOI: 10.3969/j.issn.1674-0696.2009.04.11 Abstract ( )   PDF (2296KB) ( )   According?to?one?tunnel?adjacent?to?mountain?at?eastern?mountainous?area?in?Jilin?province,?the?construction?process?of?shed-tunnel?is?simulated?by?the?finite?element?software?ANSYS.?By?virtue?of?Drucker-Prager?yield?criterion?to?analyze?the?elastic-plasticity,?and?using?＂live＂?or?＂dead＂?attributes?of?the?elements,?the?process?of?excavation?of?slope,?construction?of?shed-tunnel?and?backfilling?is?simulated.?The?status?of?stresses?and?deformation?of?shed-tunnel?structure?is?researched.?The?questions?should?be?paid?attention?to?in?the?construction?process?of?shed?tunnel?are?pointed?out.?Furthermore,?The?shed-tunnel?structure?and?gradient?of?backfilling?are?optimized.?The?results?show?that?shed-tunnel?with?inclined?column?and?semi-arch?is?more?reasonable?than?that?with?straight?column?and?semi-arch?in?structure,?and?different?gradient?of?back-filling?has?great?impact?on?stresses?of?shed-tunnel?structure,?which?provides?references?for?the?design?of?shed-tunnel. References | Related Articles | Metrics

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Mechanical?Effect?of?Neighborhood?Highway?Tunnel?Construction XU Linsheng 2009, 28(4): 685-688.  DOI: 10.3969/j.issn.1674-0696.2009.04.12 Abstract ( )   PDF (1082KB) ( )   Adopting?the?FEM?numerical?simulation,?the?mechanical?characteristics?of?middle?rock?pillar,?the?approach?degree?of?surrounding?rock?yielding,the?bolt?axial?force?and?the?internal?force?of?secondary?lining?structure,?etc.?are?elaborated.?The?results?demonstrate?as?follows：?when?the?clear?distance?equals?B/3,?the?mechanical?behavior?of?middle?rock?pillar?is?adverse,?because?it?is?severely?affected?by?the?overlapping?effect?of?the?excavation?stress?field?from?left?and?right?holes;the?yielding?district?can?cut?across?middle?rock?pillar,?and?the?supporting-lining?structures?around?the?middle?rock?pillar?should?be?strengthened.?With?the?clear?distance?at?the?range?from?0.?85B?to?1.5B,the?mechanic?state?of?middle?rock?pillar?is?little?influenced?by?the?clear?distance. References | Related Articles | Metrics

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Length?Design?of?Speed?Change?Lane?at?Interchanges?of?Expressway YUAN Zhongdan, XUE Ling, WANG Weili 2009, 28(4): 689-693.  DOI: 10.3969/j.issn.1674-0696.2009.04.13 Abstract ( )   PDF (486KB) ( )   Aiming?at?the?potential?problems?of?the?referential?value?of?speed?change?lane?in?current?norms?of?China,?the?comparative?research?on?norms?at?home?and?overseas?is?carried?out.?Based?on?the?field?measurement?of?vehicle?velocity?at?the?interchange?of?expressway?in?Jiangsu?province,?the?deep?analysis?on?the?length?of?speed?change?lane?is?carried?out.?On?the?premise?of?running?safety,?the?most?economic?design?method?is?proposed. References | Related Articles | Metrics

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Mechanical?Analysis?on?the?Structure?of?Cement?Strontium?Slag?Pavement DONG Yuanshua,i TANG Boming, ZHU Hongzhou, ZHANG Minggong 2009, 28(4): 694-697.  DOI: 10.3969/j.issn.1674-0696.2009.04.14 Abstract ( )   PDF (880KB) ( )   According?to?the?climatic?characteristics?of?Chongqing,?load?characteristics?of?the?highway?and?structural?parameters?of?the?cement?strontium?slag?pavement,?the?temperature?contracting?stress,?temperature-warping?stress,?load?stress?and?iteration?effect?of?the?cement?strontium?slag?pavement?are?analyzed?by?making?use?of?the?elastic?layered?system?theory.?The?analysis?result?indicates?that?：?it?is?not?necessary?to?set?the?expansion?joint?because?the?resilient?modulus?of?cement?strontium?slays?concrete?is?much?lower?than?that?of?cement?concrete;?furthermore,?its?internal?stress?is?lower?than?its?intensity?under?the?co-action?of?temperature?and?load,?which?will?not?generate?shrinkage?crack.?The?long-term?performance?observation?of?several?cement?strontium?slag?experimental?roads?indicates?that?the?cement?strontium?slag?pavement?without?sawed?joint?has?higher?performance,?which?can?be?used?widely?in?the?highway?construction?of?western?countryside. References | Related Articles | Metrics

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Study?on?the?Performance?of?Pervious?Concrete?Used?on?Pavement WANG Rui-yan, WU Guo-xiong, GUO Peng 2009, 28(4): 698-701.  DOI: 10.3969/j.issn.1674-0696.2009.04.15 Abstract ( )   PDF (799KB) ( )   Pervious?concrete?is?one?kind?of?porous?concrete?which?has?skeleton?structure.?By?the?orthogonal?test?and?corre-sponding?analysis,?the?influence?of?factors,?such?as?the?volume?ratio?of?aggregate?to?slurry,?the?aggregate?gradation?and?the?water-cement?ratio,?on?the?mechanical?and?permeable?properties?of?pervious?concrete?is?studied.?The?results?can?provide?the?basis?for?the?design?and?application?of?pervious?concrete. References | Related Articles | Metrics

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3D?Finite?Element?Analysis?on?Asphalt?Pavement?Dynamic?Response?under?Moving?Load MA Xin, , GUO Zhong-yin, YANG Qun 2009, 28(4): 702-707.  DOI: 10.3969/j.issn.1674-0696.2009.04.16 Abstract ( )   PDF (1729KB) ( )   The?asphalt?pavement?of?newly-buih?roads?in?China?adopts?the?double?group?uni-axle?load?100?kN?（BZZ-100）as?the?standard?axle?load,which?is?designed?by?the?multi-layer?flexible?design?theory?under?the?effect?of?double-circle?uniformly?distributed?load.?But?the?load?that?vehicle?imposes?on?the?road?surface?is?the?moving?load.?FEM?analysis?on?the?dynamic?re-?sponse?of?road?surface?in?the?eases?of?vehicle?running?at?common?speed?and?at?the?state?of?baking?is?carried?out,?through?establishing?the?three?dimensional?dynamic?FEM?model?of?semi-rigid?surface?pavement.?The?time?course?curves?of?the?vertical?displacement,?the?vertical?stress,?the?horizontal?stress,?the?vertical?shear?stress?and?the?horizontal?shear?stress?of?nodes?at?different?depth?which?is?underneath?the?load?are?obtained.?The?calculation?results?are?compared?with?those?under?the?static?load. References | Related Articles | Metrics

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Thermo?Gravimetric?Analysis?on?Four?Fractions?of?Asphalt?and?Base?Asphalt LIN Hai-ying, XUE Xin, LIHua-chun 2009, 28(4): 708-710.  DOI: 10.3969/j.issn.1674-0696.2009.04.17 Abstract ( )   PDF (665KB) ( )   The?non-isothermal?process?of?four?fractions?of?asphalt?and?several?base?asphalt?is?studied?by?TGA,?and?the?results?show?that?the?sharp?decomposition?temperature?of?saturates,?aromatic,?resins?and?asphaltenes?is?300℃?,412℃?,438℃,?472℃?respectively?;?the?decomposition?temperature?of?asphalt?with?more?saturates?content?is?lower.?The?isothermal?gravimetric?analysis?on?saturates?and?aromatics?is?carried?out?when?the?construction?temperature?of?modifying?and?storing?the?asphalt?is?160℃?-?180℃.?The?study?shows?that?saturates?and?aromatics?will?loose?a?large?amount?of?weight?during?the?storage?at?160℃-?180℃.?The?loss?weight?of?saturate?and?aromatic?is?almost?three?times?more?during?storage?at?180℃?than?that?at?160℃.?The?asphalt?from?different?places?has?different?weight?loss?because?the?contents?of?saturate?and?aromatic?in?each?kind?of?asphalt?are?different.?During?thermal?storage,?the?weight?loss?of?asphalt?with?lower?saturate?tends?to?be?stable?in?a?short?time?and?the?weight?loss?of?asphalt?with?higher?saturate?is?more?severe?with?the?time?passing?by. References | Related Articles | Metrics

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Modified?Techniques?of?Commonly-Used?Flame-Retardant??Asphalt?in?Asphalt?Pavement?Tunnel TAN Yi-qiu, LAN Bi-wu, JI Lun, SHANG Yun-fei 2009, 28(4): 711-714.  DOI: 10.3969/j.issn.1674-0696.2009.04.18 Abstract ( )   PDF (398KB) ( )   Asphalt?pavement?has?become?the?mainstream?of?the?tunnel?construction.?However,?the?asphalt?is?inflammable,?and?serious?tunnel?fire?accidents?have?occurred?in?many?countries?around?the?world.?The?commonly-used?effective?flame?retardants?are?selected?to?composite?the?Halogen-Antimony-Boron?flame?retardant?system.?The?flame-retardant?modified?technology?of?asphalt?pavement?is?studied?through?many?experiments,in?which?many?indicators,?such?as?limiting?oxygen?index,?synergistic?efficiency?and?EV?are?adopted?to?evaluate?the?effectiveness?of?flame-retardant?asphalt;the?optimum?content?is?determined?through?the?orthogonal?test;?the?technical?methods?and?results?of?commonly-used?modified?flame?retardants?are?pointed?out,?and?the?feasible?proposal?of?Halogen-Antimony-Boron?flame?retardant?system?i.s?given. References | Related Articles | Metrics

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Experiment?Study?on?the?Performance?of?Rubber-Asphalt?Mixtures??Based?on?GTM?Design?Method Li Zhengzhong, HE Zhaoyi, SONG Xiaoyan, SUN Bin 2009, 28(4): 715-719.  DOI: 10.3969/j.issn.1674-0696.2009.04.19 Abstract ( )   PDF (694KB) ( )   In?order?to?research?the?gradations?and?road?performance?of?the?rubber-asphah?mixture?suitable?for?GTM?rotational?motdding,?the?mixing?ratio?of?rubber-asphalt?mixtures?is?designed?according?to?GTM?physical?mechanics.?Systematic?research?on?the?continuous-graded?and?three?kinds?of?gap-graded?mixtures?with?different?through?rate?of?4.?75mm?is?carried?out?respectively.?Without?considering?the?volume?parameters?,and?the?optimum?asphalt?volume?is?made?out?only?aeeording?to?the?physical?and?mechanical?parameters,including?GSI?and?GSF.?On?this?basis,the?linear?expansion?of?the?rubber-asphalt?designed?in?different?moulding?ways?is?studied?contrastively,?and?it?is?proved?that?the?continuous-graded?rubber-asphalt?mixtures?can?be?used,?according?to?GTM?design?method.?Through?comprehensive?and?contrastive?evaluation?of?the?road?performance,?it?is?effectively?proved?that?GTM?design?method?is?more?appropriate?to?design?the?continuous-graded?rubber-asphalt?mixtures. References | Related Articles | Metrics

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Impact?of?Gradation?on?Voidage?of?Rubber?Asphalt?Mixture ZHENGMao, HUANGWei-dong 2009, 28(4): 720-723.  DOI: 10.3969/j.issn.1674-0696.2009.04.20 Abstract ( )   PDF (574KB) ( )   Rubber?asphalt?mixture?has?been?used?more?and?more?as?a?surface?material;however,?no?introduction?to?special?gradation?of?rubber?asphalt?mixture?can?be?found?in?current?domestic?asphalt?pavement?design?and?construction?norms.?So?the?research?on?the?discontinuous?gradation?of?rubber?asphalt?mixture?is?very?necessary.?SGC?（?Superpave?Gyratory?Compactor）?is?used?to?mold?the?test?sample?of?rubber?asphalt?mixture?in?the?room.?The?impact?rule?of?gradation?on?the?voidage?of?discontinuous?gradation?rubber?asphalt?mixture?is?summarized,?through?the?measurement?of?the?voidage?of?rubber?asphalt?mixture?test?sample?with?different?gradations.?And?the?range?of?each?level?of?the?aggregate?is?pointed?out.?The?voidage?of?rubber?asphalt?mixture?can?be?better?controlled?when?the?bitumen?content?is?low,which?is?beneficial?to?provide?a?better?guidance?to?the?road?construction. References | Related Articles | Metrics

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Hazard?Degree?of?Fengjiaba?Landslide?in?Wushan?at?Three?Gorges??Reservoir?Area?Based?on?Analytic?Hierarchy?Process GU Xiu-zhi, PENG Yu-qi, CHEN Hong-kai 2009, 28(4): 724-727.  DOI: 10.3969/j.issn.1674-0696.2009.04.21 Abstract ( )   PDF (1285KB) ( )   In?order?to?reduce?the?unnecessary?loss?brought?by?landslide,?AHP?is?used?to?analyze?the?main?factors?affecting?Fengjiaba?landslide?in?Wushan.?Furthermore,?the?hierarchical?structure?model?and?the?comparison?matrix?are?established,?and?the?weight?vector?is?calculated.?Finally,?the?hazard?degree?of?Fengjiaba?landslide?in?Wushan?is?determined?to?belong?to?the?high-risk?area. References | Related Articles | Metrics

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Freeway?Congestion?Estimation?Using?Probe?Vehicles WANG Zhongren 2009, 28(4): 728-732.  DOI: 10.3969/j.issn.1674-0696.2009.04.22 Abstract ( )   PDF (1218KB) ( )   The?quantification?of?traffic?congestion?is?critical?to?effective?freeway?traffic?management.?A?congestion?quantification?method?based?on?probe?vehicles?is?presented,?together?with?a?general?discussion?on?the?pros?and?cons?of?the?methodology.?In?the?mean?time,?cautions?in?field?implementation?of?the?method?are?put?forward References | Related Articles | Metrics

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Fuzzy?Diagnosis?Method?of?Dangerous?Factors?in?Road?Accident-Prone?Section LIU Wei, 2009, 28(4): 733-735.  DOI: 10.3969/j.issn.1674-0696.2009.04.23 Abstract ( )   PDF (138KB) ( )   The?dangerous?factor?diagnosis?in?road?accident-prone?section?is?the?foundation?and?premise?to?improve?the?traffic?accident?black-spots.?Establishing?credible?diagnostic?model?of?dangerous?factors?is?more?effective?to?improve?the?remediation?effect?of?road?accident-prone?section.?According?to?the?principle?of?fuzzy?diagnosis,?the?fuzzy?relationship?model?between?traffic?accident?forms?and?their?causes?in?accident-prone?section?is?established,?and?the?membership?function?is?proposed?on?the?basis?of?historic?traffic?accident?statistic?data.?The?main?dangerous?factors?and?their?sequences?of?importance?degree?are?obtained?by?virtue?of?fuzzy?relationship?diagnostic?model,?which?provides?the?basis?for?the?decision-making?of?improving?road?safety?facility. References | Related Articles | Metrics

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Fuzzy-Coordination?Ratio?Evaluation?Method?of?Highway?Landscape ZHANG Xiu-li, PAN Feng-wen, ZHOU Wei-feng, ZHANG Li 2009, 28(4): 736-741.  DOI: 10.3969/j.issn.1674-0696.2009.04.24 Abstract ( )   PDF (209KB) ( )   In?order?to?clarify?the?meaning?of?highway?landscape?and?also?to?enhance?the?level?of?highway?design,?the?highway?landscape?evaluation?is?studied,?by?virtue?of?the?concept?＂large?landscape＂?in?landscape?ecology?theory.?Thus,?using?the?system?theory?and?fuzzy?mathematics?theory,?the?fuzzy-coordination?ratio?evaluation?method?of?highway?landscape?is?established?and?the?indicators?of?horizontal?and?longitudinal?evaluation?on?highway?landscape?are?proposed?definitely,?which?means?blur-?ring?the?comprehensive?evaluation?value?and?coordination?ratio.?The?whole?evaluation?system?is?established?and?the?indicators?are?selected?in?the?case?study. References | Related Articles | Metrics

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Order?of?Link?Trait?Based?on?Significance?and?Reliability HUANG Zhengfeng 2009, 28(4): 742-744.  DOI: 10.3969/j.issn.1674-0696.2009.04.25 Abstract ( )   PDF (447KB) ( )   The?concept?of?link?trait?is?introduced.?Link?trait?is?defined?as?the?linear?weighted?sum?of?the?link?significance?and?the?link?capacity?reliability.?As?the?critical?evaluation?indicator?of?urban?highway?and?road?sections,?the?link?trait?is?helpful?to?ensure?the?road?section?which?needs?urgent?improvement.?The?link?capacities?are?assumed?to?be?subject?to?a?continuous?distribution?function?and?Monte?Carlo?simulation?is?used?to?solve?the?stochastic?user?equilibrium?assignment?model.?The?link?significance?is?ascertained?with?the?sensitivity?analysis?of?stochastic?equilibrium?network?flows.?Link?capacity?reliability?is?calculated?through?its?relevant?distribution?functions.?The?order?of?link?trait?can?be?ascertained?with?all?the?variables?known?above.?A?case?study?of?a?small?network?is?carried?out?,which?verifies?the?feasibility?of?ordering?the?link?trait?indicator References | Related Articles | Metrics

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Application?of?Four-Step?Method?of?Traffic?Planning?to??Logistics?Demand?Forecast MA Kai, EILI Ismutull 2009, 28(4): 745-750.  DOI: 10.3969/j.issn.1674-0696.2009.04.26 Abstract ( )   PDF (669KB) ( )   Combined?with?the?characteristics?of?four-step?method?of?traffic?planning,the?four-step?method?of?traffic?planning?is?applied?to?logistics?demand?forecast?of?urban?logistics?planning,?and?the?methods?and?models?are?discussed?and?studied?respectively?in?each?step.?Finally,?according?to?the?application?of?the?four-step?logistics?demand?forecast?method,?the?corre-?sponding?methods?and?contents?of?urban?logistics?investigation?and?analysis?are?introduced?briefly. References | Related Articles | Metrics

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Evaluation?Method?of?Construction-Agent?System?Based?on?DEA HUANG Xi-bing, , HUANG Qing, HUANG Yun-de 2009, 28(4): 751-754.  DOI: 10.3969/j.issn.1674-0696.2009.04.27 Abstract ( )   PDF (189KB) ( )   Considering?the?agent?obligations?and?the?standard?of?evaluating?the?biding?to?select?the?construction?agent?all?over?the?country,?an?index?system?is?established?to?evaluate?the?construction-agent?system.?And?the?evaluation?method?of?con-?struction-agent?system?based?on?DEA?is?put?forward.?The?C2R?model?should?be?used?when?the?tenderee?have?no?special?preference?of?any?indexes,?otherwise?the?C2?WH?model?should?be?used.?Aiming?at?the?problem?that?the?sequence?of?successful?bid?can＇?t?be?ensured?in?choosing?the?construction?agent?because?of?the?overabundance?of?decision-making?units?（DMUs）?in?general?DEA?method,?an?improved?method?is?proposed,?which?can?continue?to?evaluate?through?establishing?the?ideal?DMUs.?The?reasonability?and?feasibility?of?evaluation?method?of?construction-agent?system?based?on?DEA?is?verified?by?the?case?study. References | Related Articles | Metrics

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Simulation?Study?on?Hydraulics?Characteristic?of?High?Head?Lock?during??Valve?Opening?Process?Based?on?Dynamic?Mesh?Technology YANG Zhong-chao, YANG Bin, CHEN Ming-dong, HU Xue-mei 2009, 28(4): 758-762.  DOI: 10.3969/j.issn.1674-0696.2009.04.29 Abstract ( )   PDF (2519KB) ( )   Using?dynamic?mesh?technology?and?VOF?method,?the?valve?opening?process?of?high?head?lock?is?simulated?successfully?by?means?of?k-ε?turbulence?model.?The?temporal?and?spatial?changing?rule?of?the?hydraulic?parameters,?such?as?the?flow?pattern,?the?flow?velocity?and?the?pressure?and?the?dangerous?region?and?time?in?which?cavitation?erosion?and?flow?induced?vibration?occur?is?studied.?0.4?of?valve?opening?ration?is?the?worst?time?during?the?valve?opening?process,?for?there?are?sources?of?noise?at?the?little?gap?behind?valve,?root?edge?below?valve?and?sharp?angle?of?bank,?where?the?high?speed?flow?and?dangerous?cavitation?erosion?also?occur.?The?front?part?of?ceiling?has?the?lowest?negative?pressure?when?valve?opening?ration?is?about?0.?5,?which?also?has?the?risk?of?cavitation?erosion.?When?valve?opening?ration?is?0.?8,?the?end?of?rise?step?is?the?most?dangerous?cavitation?erosion?region?and?the?pressure?is?up?to?negative?120.?75?kPa.?So?the?suggestion?that?the?tunnel?pattern?should?be?further?optimized;the?valve?should?be?quicker?opened?to?shorten?the?duration?of?negative?pressure?;?and?protective?measures?should?be?taken?to?prevent?the?cavitation?erosion?is?proposed. References | Related Articles | Metrics

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Simulation?Analysis?on?Navigation?Indexes?of?Xiangjiaba?Bridge?by?Ship?Model?Test CAiChuang, CHEN Li, CAiRu-zhe, ZHENG Tao 2009, 28(4): 763-767.  DOI: 10.3969/j.issn.1674-0696.2009.04.30 Abstract ( )   PDF (834KB) ( )   The?navigable?condition?of?Xiangjiaba?Bridge?across?Jinsha?River?is?very?complicated.?In?order?to?investigate?the?navigable?condition?of?Xiangjiaba?Bridge?and?the?implements?of?the?optimal?measurements,?the?simulation?study?on?navigation?indexes?of?Xiangiiaba?Bridge?is?carried?out?by?ship?model?test,to?ensure?all?boats?can?transit?dam?safely.?According?to?the?maximum?safe?limitative?value?requirement?of?ship?model?test,?the?test?results?are?analyzed.?The?best?sea?route,?the?operation?mode?and?the?navigation?difficulty?are?proposed.?Finally?the?recommended?scheme?and?suggestion?is?put?forward. References | Related Articles | Metrics

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Numerical?Simulation?of?Planar?2D?Flow?of?Chongqing?Cuntan?Phase?Ⅲ?Project ZHU Xu, YANG Bin, FANG Chun-yan 2009, 28(4): 768-770.  DOI: 10.3969/j.issn.1674-0696.2009.04.31 Abstract ( )   PDF (932KB) ( )   Mathematical?model?is?built?for?smulating?rivers?condition?of?The?Phase?Ⅲ?Project?of?Chongqing?Cuntan?resch,it?bases?on?orthogonal?body-fitted?coordinate?and?two-dimension?shallow?water?equation.?Verification?calculation?is?performed?about?velocity?and?transverse?distrihutes?of?velocity.?Contrasted?with?the?observed?data,?the?result?shows?that?it?can?accurately?simulate?the?velocity?field?of?project?reach. References | Related Articles | Metrics

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Numerical?Simulation?of?Waterway?Regulation?Engineering?in?Rongjiang?River WEN Cen, MiAO Zhu 2009, 28(4): 771-774.  DOI: 10.3969/j.issn.1674-0696.2009.04.32 Abstract ( )   PDF (884KB) ( )   Aiming?at?the?movement?characteristics?of?the?flow?and?sediment?in?Rongjiang?River?and?combining?with?the?waterway?regulation?engineering,?the?two-dimensional?mathematical?model?which?simulates?the?movement?characteristics?of?the?flow?and?sediment?in?this?area?is?established.?The?field?measurement?data?are?adopted?to?verify?the?correctness?of?the?model,?and?the?simulation?result?is?closely?fitted?with?the?field?data,?which?shows?that?the?model?is?creditable?to?simulate?the?movement?situation?of?water?and?sediment?in?tidal?river.?Therefore,?it?can?provide?the?technical?support?for?the?waterway?regulation. References | Related Articles | Metrics

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Reconstruction?of?Logistics?Operation?Agents?of?Port?Container?Terminal XiA Xin-hai, , TANG De-hua 2009, 28(4): 775-779.  DOI: 10.3969/j.issn.1674-0696.2009.04.33 Abstract ( )   PDF (694KB) ( )   After?introducing?the?operation?process?of?port?container?terminal,?the?structure?of?logistics?operation?reconstruction?system?based?on?Multi-Agent?of?container?terminal?is?established?by?adopting?the?computation?agent?and?role?agent.?The?working?process?of?operation?role?agent?in?reconstruction?is?investigated,?and?the?operation?role?agent?is?designed?by?rein-?forcement?learning?algorithm.?Then?computation?agent?model?in?reconstruction?is?expounded.?Furthermore,?the?coordination?of?adjacent?operation?agent?roles?is?realized?by?the?bi-level?programming?theory.?Finally,?a?case?study?of?the?adjacent?operation?reconstruction?of?container?truck?operation?and?offshore?operation?at?one?port?container?terminal?testifies?the?effectiveness?of?the?reconstruction,?which?is?useful?to?improve?the?reliability?and?the?coordination?of?port?container?terminal?logistics?operation?system. References | Related Articles | Metrics

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Optimization?Design?of?Forklift?and?Truck?in?Open-Pit?Mines PENG De-li, ZHANG Wei-bing 2009, 28(4): 780-784.  DOI: 10.3969/j.issn.1674-0696.2009.04.34 Abstract ( )   PDF (180KB) ( )   It?is?the?major?channel?to?increase?the?economic?efficiency?by?improving?the?utilization?ratio?of?large?forklift?and?truck?in?the?open-pit?mines.?Considering?the?conditions?such?as?the?production?（8?hours）with?the?shovel-bit?output,the?demand?for?unloading?point,?the?road?transport?capacity,?the?power?shovel?loading,?the?capacity?of?the?unloading?point?etc.?in?the?open-pit?mines,the?target?to?use?the?least?total?volume?（ton-kilometers）?,the?least?number?of?forklifts?and?trucks?is?proposed?to?improve?the?utilization?ratio?of?large-scale?equipments.?The?linear?integer?programming?（0-1?P）model?and?the?non-linear?programming?model?are?established,?at?the?same?time?the?corresponding?fast?algorithm?is?given.?A?case?study?of?one?mine?verifies?the?algorithm,and?the?direction?of?target?model?which?can?be?further?optimized?is?pointed?out. References | Related Articles | Metrics

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Welding?Shrinkage?Deformation?and?Residual?Stress?of?Duplex?Stainless?Steel?2205 WANG Zhixiang, WANG Zhenglun 2009, 28(4): 785-788.  DOI: 10.3969/j.issn.1674-0696.2009.04.35 Abstract ( )   PDF (529KB) ( )   TIG?welding?is?adopted?to?carry?out?the?welding?test?of?duplex?stainless?steel?2205.?Using?regression?analysis?method,?the?impact?of?the?welding?current,?arc?voltage,?welding?speed?and?the?thickness?on?welding?shrinkage?deformation?is?studied.?Residual?stress?on?2?mm?thick?welding?specimen?is?tested?by?the?slot-cutting?method,?and?the?distribution?rule?of?longitudinal?residual?stress?along?welding?cross-section?is?found.?And?the?orthogonal?test?method?is?also?used?to?optimize?the?welding?parameters. References | Related Articles | Metrics

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New?Monte?Carlo?Potts?Model?in?Metal?Recrystallization?Simulation ZHANG Ji-xiang , , YANG Gang , ZHONG Li 2009, 28(4): 789-793.  DOI: 10.3969/j.issn.1674-0696.2009.04.36 Abstract ( )   PDF (1629KB) ( )   A?novel?recrystallization?simulation?2-dimension?Monte?Carlo?Potts?model?is?constructed,?including?some?reform?measures?such?as?the?new?nucleation?pattern,?the?storage?energy?distribution,?and?the?new?node?tropism?switch?probability?formula?based?on?the?metal?recrystallization?physical?theory?and?experiments.?And?then?this?novel?model?is?applied?to?simulating?the?isothermal?annealing?of?cold?rolling?high?purity?aluminum?plate.?The?results?show?that?the?innovational?model?could?emulate?heterogeneous?nucleating?and?new?grain?growing?effectually;the?simulation?nucleation?sequence?and?nucleation?rate?accords?with?that?of?recrystallization?theory?and?experiments,?and?recrystallization?kinetics?curve?also?accords?with?JAMK?the-?ory.?The?Avrami?exponent?nαv?is?less?than?the?theoretically?predicted?value?2,?which?accords?with?that?of?experiments. References | Related Articles | Metrics

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Fuzzy?Control?for?Dual-Clutch?Transmission?Vehicle?during?Launching?Process ZHANG Shi-yi, LiGuang-hui 2009, 28(4): 794-800.  DOI: 10.3969/j.issn.1674-0696.2009.04.37 Abstract ( )   PDF (2551KB) ( )   Based?on?the?analysis?of?two?clutches?in?the?joint?at?the?same?time?for?dual-clutch?transmission?during?vehicle?launching,?throttle?and?throttle?rate?as?the?fuzzy?controller?input?for?two?clutches?engaging?intensity?and?shifting?during?vehicle?launching?is?established,?to?improve?the?vehicle?launching?quality.?And?the?fuzzy?controller?with?the?clutch?rotational?speed?difference?and?the?change?rate?of?clutch?engagement?speed?as?input?is?also?designed.?Taking?Changan?vehicle?as?research?object?in?the?case?study,the?simulation?analysis?is?carried?out.?The?simulation?results?indicate?that?the?adopted?clutch?fuzzy?control?strategy?can?improve?the?starting?and?shifting?quality?of?dual-clutch?transmission?vehicle?effectively. References | Related Articles | Metrics

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Hydroxyl-Terminated?Polylactic?Acid?Oligomers YUAN Xiao-ya 2009, 28(4): 801-803.  DOI: 10.3969/j.issn.1674-0696.2009.04.38 Abstract ( )   PDF (277KB) ( )   Hydroxyl-terminated?polylactic?acid?oligomers?were?prepared?by?pre-removal?of?water?and?poly-condensation?polymerization?of?lactic?acid?with?1,4-butanol?as?the?functional?comonomer.?The?effect?of?reaction?parameters?including?the?polymerization?press?and?the?amount?of?1,4-butanol?and?catalyst?on?the?molecular?weight?of?the?oligomers?was?investigated?in?detail.?The?results?show?that?the?molecular?weight?of?oligomers?is?lowered?gradually?with?the?increase?of?the?loading?of?1,4-butanol;and?the?molecular?weight?can?be?increased?by?reducing?the?polymerization?press;increasing?the?dosage?of?the?catalyst?SnCl2?·?2H2O?can?increase?the?molecular?weight?of?the?oligomers?to?a?less?extent,however,the?optimal?amount?of?tile?catalyst?should?be?controlled?at?0.?5%. References | Related Articles | Metrics

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Computing?with?Words?via?Lattice-Valued?Context-Free?Grammar YANG Chun-zhi, ZHANG Chao 2009, 28(4): 804-806.  DOI: 10.3969/j.issn.1674-0696.2009.04.39 Abstract ( )   PDF (140KB) ( )   The?lattice-valued?context-free?grammar?is?equivalent?to?the?lattice-valued?Greibach?grammar?when?the?lattice?semigroups?satisfy?the?commutative?laws.?According?to?Zadeh＇s?extension?principle,?computing?with?words?via?lattice-valued?context-free?grammar?is?studied.?Finally,?this?principle?indicates?that?computing?with?words?can?be?implemented?with?values?with?the?price?of?a?big?amount?of?extra?computations. References | Related Articles | Metrics

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Query?Processing?for?Large?XML?Data?in?Distributive?Environment LUO Jing, CHEN Ning 2009, 28(4): 807-812.  DOI: 10.3969/j.issn.1674-0696.2009.04.40 Abstract ( )   PDF (686KB) ( )   Aiming?at?the?query?for?large?XML?data,?an?efficient?distributive?query?processing?method?is?proposed,?which?can?realize?the?query?through?partitioning?and?distributing?XML?data?to?multiple?computation?nodes.?Every?partitioned?XML?datum?is?distributed?to?the?computation?nodes?to?balance?the?bearing?capability?of?CPU.?It?is?very?important?to?take?account?of?the?query?workloads,?which?are?closely?related?to?the?query?processing?cost?at?each?computation?node?in?distributive?envi-?ronment.?Or?in?the?case?of?load?unbalance?among?computation?nodes,?the?partitioned?XML?data?should?be?relocated?to?balance?the?CPU?load.?The?experiment?result?indicates?that?this?method?can?improve?the?performance?of?query?processing?of?large?XML?data?in?distributive?environment?obviously References | Related Articles | Metrics