Archive

24 August 1996, Volume 15 Issue 4 Previous Issue    Next Issue

---

For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Select

Experimental Investigation on Fatigue Shear Strength for Partially Prestressed Concrete with Unbonded Tendons Zhao Canhui, Jiang Bingzhang, Gong Shanglong 1996, 15(4): 1-7.  Abstract ( )   PDF (576KB) ( )   Based on the fatigue test results of 8 PPC beams with unbonded tendons, this paper analyses the effects on stirrups stress and fatigue failuret and the influence of the shear span-depth, ratio degree of prstess, fatigue limit shear, fatigue numble, ratio of stirrup on stirrups stress are studies.A formula for calculation of stirrups stress is suggested. The formula coincides well with the test results. Related Articles | Metrics

Select

Investigation of Cable Stayed Bridge with Thin Plate Girder Xiao Guanghong, Zhang Qiuling 1996, 15(4): 8-13,20.  Abstract ( )   PDF (416KB) ( )   Based on test results of cable stayed bridge mcxlel with thin reinforced concrete girder, this paper investigates the stubility of thin plate girder, the capacity to distribution loads, mode of damage of the bridge and the dynamic behavior of this type of bridge. It indicates that the cable stayed bridge with thin reinforced concrete girder is reliable. Related Articles | Metrics

Select

Random Pressure Generated by Airplane-Airfield Interactions Sun Lu, Deng Xuejun 1996, 15(4): 14-20.  Abstract ( )   PDF (426KB) ( )   Pavement roughness of airfield is one of Primary factors causing vertical vibration of travelling airplane.In order to analyses pavement dynamics,the paper studies random force generated by air plane-airfield interactions.A two-degree-of-freedom suspenaion system that is the simplificahon model of an airplane is established,through which we can express power spectral density (PSD) of pressure as following form:Sp(ω)=(k2+C2ω2)|H1(ω)|2Sξ (ω).Here H1 (ω)is the property of thevibration system. Therefore, more statictical characterishcs can be obtained by this formula. Related Articles | Metrics

Select

General Approach on Rock Mass Seepage Features in High & Steep Slope in the Permanent Shiplock of the Three Gorges Project (TGP) Chen Hongkai, Zhang Yongxing, Yan Chunfeng 1996, 15(4): 21-25,41.  Abstract ( )   PDF (413KB) ( )   Based on investigation in field in the permanent shiplock of the Three Gorges Project (TGP) basic rock mass seepage features are discussed in this paper. Water-conduction fracluies (WCF) arc selected from thousand of rupture planes or joints and faults, underground water disiribuition and seepage dis charge in WCF are analysized in detail, which outline basic seepage features in the area, then we provide network seepage analysis model formed with WCF. The model is useful in seepage studies farther. Related Articles | Metrics

Select

Nonlinear Finite Element Analysis and Study on Unbonded Prestressed Concrete Beam Wang Zhong 1996, 15(4): 26-32.  Abstract ( )   PDF (464KB) ( )   In this paper, a nonlinear finite element methods developed to analyze and study the behaviors of Unbonded Prestressed Concrete (U. P. C) beam. The author adopts various material analysis mcxiels, makes a program by means of finite element method to analyze U. P. C test beams. The results of finite element analysis well agree with those of test beams. By analyzing some factors which are considered to influence ultimate flexural strength and shear strength of U. P. C beam, puts forward a practical calculation formula. Related Articles | Metrics

Select

Simple Supported Girder Computation with External Tendons Shan Chenglin 1996, 15(4): 33-37.  Abstract ( )   PDF (331KB) ( )   This paper puts forward and inquires into the computation methcxl of partially prestressed concrete simple supported box girder and T-girder of equal cross-section with external tendons in structural design. Related Articles | Metrics

Select

A Study on Allowable Perpetual Deformation of Bridges Zhou Jianting 1996, 15(4): 38-41.  Abstract ( )   PDF (277KB) ( )   It is important for a bridge's safety to restriot its perpetual deformation correctly.In this paper by analysing aspects of relevant factors, the writer sets up a formula of allowable perpetual deformation of bridges.The result of study will be useful in practice. Related Articles | Metrics

Select

Natural Frequencies of Cylindrical liquid Storage Containers Wang Yong 1996, 15(4): 42-47.  Abstract ( )   PDF (360KB) ( )   In this paper, natural frequencies of cylindrical liguid storage containers arc found through the use of a discretization scheme in which the elastic shell is modeled by finite elements of a ring shape and the liquid is treated as a continuum by boundary solution techniques. In tliis approach, the number of the unknown is substantially less than those analyses where both tank wall and liquid are subdivided in to finite elements. Related Articles | Metrics

Select

On Joint Displacement of Cement Concrete Pavement Li Guoqiang, Huang Wei, Deng Xuejun 1996, 15(4): 48-53.  Abstract ( )   PDF (336KB) ( )   With the help of displacement calculus of variations,the joint displacement formula for bath elastic and Burger's materials are obtained under different constraint conditions.The result shows that joint displacement is greatly affected by constraint conditions and joint width.Thus,the determination of joint width should be calculated by jointly considering the joint construction conditions.The results of this paper are of referential values for joint design and construction of both bridge deck and other kinds of pavement. Related Articles | Metrics

Select

Study on Visco elastic Parameters Test on Material of Cement Concrete Pavement Zhou Huxin, Chen Rongsheng, He Zhaoyi 1996, 15(4): 54-62.  Abstract ( )   PDF (473KB) ( )   First, various kinds of material visco-elastic mcxlels are analysed. Visco-elastic test is studied on cement concrete pavement. Second, using minimum variance principle and regression analysis method computer program VDT is drawn up. Finally, visco-elastic parameters are obtained according to test curves. It has practical value for calculating curling stresses on cement pavement. Related Articles | Metrics

Select

Developing the Form of Transport Coordinatedwith Lebensraum Amplifying Hong Wei 1996, 15(4): 63-68.  Abstract ( )   PDF (489KB) ( )   This paper considers that China ought to develop the form of transport coordinated with lebensraum amplifying,and put forward a piece of point of view as multiformity of transport form to be important condition promoting economic growth and saving resource and environmental capacitance,and so on. Related Articles | Metrics

Select

The Expectation of GPS Application Highway Engineering Liu Shanhong 1996, 15(4): 69-77.  Abstract ( )   PDF (711KB) ( )   The theory and applications of Global Positioning System (GPS) are reported briefly in this paper.GPS has caused great change in surveying field.The paper introduce the proper application method of GPS technology in highway engineering. It proposes what GPS should be explored and applied in highway field in future. Related Articles | Metrics

Select

Approximate Expression of Integration of Non-analytic Solutionin Calculation of Curved Channel Circulation Xu Guangxiang, Zhou Zhenglu 1996, 15(4): 78-83.  Abstract ( )   PDF (331KB) ( )   Formula computing velocity of curved channel circulation contains two integral functions F1(η),F2(η) which,has not analytic expression and it is difficult to use widely.Curve fitting and other mathe matic methods are applied in numerical integration of F1(η) and F2(η),then direct mathematic expressions whose form are simple and practical and presicion is very high are obtained in this paper.It is very convenient to apply it in practical engineering and teaching and sicence investigation. Related Articles | Metrics

Select

Research on Strain Properties of Prestressed Concrete Berthing Piles Xu Xibin 1996, 15(4): 84-89.  Abstract ( )   PDF (378KB) ( )   This paper calculates and discusses the strain properties of four reinforced sectional types of prestressed concrete berthing piles.It shous from results that the hoop pile with symmetrical arrangementis the best type for its higher ability of absorbing energy.By reasonalle design,prestressed cncreteberthing piles can be used as berthing facilities because larder strain energy may be developed before failure. Related Articles | Metrics

Select

Study on the Convergence Characteristics in Mountain Stream Liu Jianxin, Cheng Changhua 1996, 15(4): 90-94.  Abstract ( )   PDF (316KB) ( )   Based on the model test and the field data analysis,the paper emphahcally reserches on the convergence charactristics (the main stream and the tributary stream) in mountain area.The result showes that the convergrnce ratio (Q/Q) is a key factor which affects the convergence angle,slope changes,sediment transport and so on.The paper,also,argues some facial relations between Q/Q and the flow and sediment transport. Related Articles | Metrics

Select

Regression Analysis on Highway Embankment Filling Strength and Relative Factors Liu Lang, Zou Jinxue 1996, 15(4): 95-99.  Abstract ( )   PDF (271KB) ( )   Water content, dry unit weight and porosity ratio are three major factors influencing clay strength. There are uncertain relations among them we use regression analysis to find out their linear relations——linear regresion equation and prove its regression effective. Related Articles | Metrics

Select

Theory and Model of Fuzzy Optimization Used in Process of Reinforcing the Soft Foundition by Construction Waste Cui Zhengcai, Lu Zheng 1996, 15(4): 100-106.  Abstract ( )   PDF (440KB) ( )   In order to meet the needs of the character of rock and soil, the cost and design, this paper provide a comparatively optimum plan in process of reinforcing soft foundation. The process includes three steps. First, use heavy tamper to ram the soft foundation, then fill the pit with construction waste, finally ham it. The plan is chosen by the theory and model of fuzzy optimization and it achieves good economic and social benefit. Also it is very helpful to guide the engineering practice. Related Articles | Metrics

Select

APPlication of Explosion Tamping Construction on the Foundation Bed of the 50000 dwt Warf in Mawan Power Plant Wang Zhenggen 1996, 15(4): 107-112,134.  Abstract ( )   PDF (451KB) ( )   A new approach is simply introducted that the application of the explosion shake densification on the foundation bed construction of the 50000 dwt coal serf in rowan power plant in Shenzhen.The explosion damping method is of large advantage by comparing with the traditional hamner tamping method. Related Articles | Metrics

Select

Knowledge Acquisition and Knowledge Base Building for Machanical Design Expert System (Ⅱ)——dBASE Ⅲ Support Data Base and Data Interface Technique between dBASE Ⅲ & GCLISP Miao Yi, Yin Li 1996, 15(4): 113-118.  Abstract ( )   PDF (373KB) ( )   Data maintenance and data utilization are two important problems in building the data base to support machanical design expert system. This paper presents about building such data base by using dBASE Ⅲ,and developing the interface between dBASE Ⅲ and GCLISP by using FORTRAN. Related Articles | Metrics

Select

Evaluation of Metal's Properties Based on Fuzzy Sets Miao Yi, Yin Li 1996, 15(4): 119-126.  Abstract ( )   PDF (492KB) ( )   How to evaluate material properties is an important problem in applying fuzzy decisions to select the most suitable machinery port material. As an example to deal with the problems like this,a subordinating function of Single factor evaluation for metal's properties is presented by three-division methodin this paper.It is confirmed that this method together with fuzzy decisions conforms to the actual situation of engineers consideration in the process of mechanical design. Related Articles | Metrics

Select

Mechanism Approaches on Loose Media Landslide developing along Highway Xiao Hanzhong 1996, 15(4): 127-130.  Abstract ( )   PDF (272KB) ( )   Loose media landslide, one of landslide types, developes usually along highway in hill area. There is slide plane or slide zone between loose media above and rook blow. It must be emphasized that most of the rock in the landslide are low permeability, so groundwater can flow obviously in loose media, which is the hydraulic condition for the landslide to develope. Loading on road base by loose media after the base subsidency or mobiles are fundmental mechanics for the landslide to slide. Tensile area be side the base are discovered after analysis by EFM. The loose media landslide can be disposed in method including both anchoring in road base and drainage in tensile area. Related Articles | Metrics