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15 December 2007, Volume 26 Issue 6 Previous Issue    Next Issue

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Nonlinear Torsion Analysis of Composite Thin Walled Bar WU Zu-lie,ZHAO Fen,CHANG Guo-qiang 2007, 26(6): 1-6.  Abstract ( )   PDF (221KB) ( )   Taking the effects of geometrical nonlinearity into account，a general theory of composite thin walled bar is established under the combinational deformation of tension，compression and torsion.Focusing on the nonlinear torsion ana1ysis of composite thin walled bar，based on the principle of minimum potential energy，the governing equations of equilibrium as well as all boundary conditions concerned are deduced from the equivalent constitutive equations and general potential energy function.In addition，a solution to the equations of equilibrium is discussed. References | Related Articles | Metrics

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Study on Creep Effect of Eccentrically Compressed CFST Members YU Wu-jun,GU An-bang,CHEN Yu-feng,LI Bo 2007, 26(6): 7-9.  Abstract ( )   PDF (168KB) ( )   The creep-shrinkage effect of CFST is different from that of reinforced concrete because of its containment，stiff consistency and not casting water during curing period as well as its unloading.The stress recontribution of CFST is significant and must not be ignored.In order to calculate the redistributed stress effectively，according to the elastic creep theory and the principle of superposition，one general formula of analytical model for CFST creep function has been suggested based on the theory analysis on the creep-shrinkage effect of axis compression component[1].One creep model and one compensation model were made.The strain tests results met the theory analysis，and proved the formula. References | Related Articles | Metrics

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Model Construction and Contrast Analysis of Concrete-Filled Steel Tubular Arch Bridge SUI Yan-chun,XIAO Sheng-xie,LI Fang,GUO Xiang-ming 2007, 26(6): 10-14.  Abstract ( )   PDF (237KB) ( )   Haikou Bridge is a concrete-filled steel tubular arch bridge with a main span of 150m.Taking that bridge as an example， based on the software ANSYS，two kinds of spatial finite element models for the bridge were respectively established， under the consideration of the pier bases concretion and the interaction between the soil and the pile.Calculation analyses results of natural vibration of the two models are comparatively analyzed.The establishment method of the two models of the half-through concrete—filled steel tubular arch bridge is provided，which can be reference for relative research. References | Related Articles | Metrics

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Limit Bending Moment Analysis of CFST Member of Circular Section LIU Xiao-yu,LIU Dong-sheng 2007, 26(6): 15-17.  Abstract ( )   PDF (159KB) ( )   Two efects of confinement which result from the interaction between steel tube and concrete under ultimate limit bending states are analyzed.In addition，the calculation method of zero line position is deduced as well as the computational formula of limit bending moment under ideal elasto plasticity states. References | Related Articles | Metrics

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Analysis of Shear Lag in Trapezia Thin-Walled Box Beams witIl Constant Cross Section CHANG Guo-qiang,WU Zu-lie,ZHAO Fen,GUAN Yan-wu 2007, 26(6): 18-23.  Abstract ( )   PDF (225KB) ( )   Cosine functions are supposed to simulate the longitudinal displacement of thin·walled box beams when bended. The differential equations of Trapezia thin-walled box beams with constant section are derived on the basis of generalized variational principle，and the solutions of simply supported box girders subjected to vertical concentrated load and vertical uniform pressure load are obtained .The example shows that this method matches cubic·parabola—function method. References | Related Articles | Metrics

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Theoretic and Experimental Research on Loading Characteristics of Cantilever Beam in Composite Structure LI Li-feng,SHAO Xu-dong 2007, 26(6): 24-28.  Abstract ( )   PDF (282KB) ( )   Hongshan Bridge which locates in Changsha City，is a harp style cable-stayed bridge with inclined pylon and without any back-stays.The main span is 206 m long.The main girder is a spine girder，and the bilateral girders are of 13-meter-long steel-concrete composite cantilever stucture，with the longitudinal space of 4 m.The theories of loading distribution along crosswise were analyzed by adopting the modified articulated beam，The calculating formulas were deduced，and a model test was performed to prove the correction of these formulas.Finally，adding ballast weight of 320 kN on the edge of cantilever beam was adviced to solve the crack problem of negative moment zone.The crack width of concrete deck Was analyzed by taking creep and shrinkage of concrete into account and comparing kinds of various specification.The above-mentioned results provide strong basis for the design of bridge deck. References | Related Articles | Metrics

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Wind-Excited Flutter Analysis of Cable-Stayed Bridge with Long Span of Pengxi River LI Xi,TU Zhong-ren, GU An-bang 2007, 26(6): 29-32.  Abstract ( )   PDF (265KB) ( )   Focusing on the sensitivity of wind load action on cable·stayed bridge，investigated the mechanism and analytical method of wind-excited flutter.On the basis of that，taking the Pengxi river cable-stayed bridge with long span as an example，a proper dynamic calculation model Was established by using the professional software of MIDAS and with geometric nonlinear consideration.According to the dynamic behavior at both construction and completion stage，the wind-resistant behavior of the bridge was evaluated.These results provide reference for the design of wind-resistant and the analysis of dynamic stability. References | Related Articles | Metrics

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Evaluation for Cable-Stayed Bridges Stability Based on Fuzzy Theory and AHP HE Li-li,XIAO Sheng-xie,ZANG Deng-ke 2007, 26(6): 33-37.  Abstract ( )   PDF (233KB) ( )   If the stability of cable-stayed bridges are analyzed by means of a numerical procedure，it is difficult to analyze all the factors synthetically，the calculational method is complicated and workload is great.Based on the fuzzy theory，the research on stability of cable-stayed bridges are carried out by the multi-grade fuzzy synthetic judge.Considering factors about stability，the evaluation matrixes of single factor are established，then，the proportions of all kinds of factors are determined by comprehensive application to AHP and the experts evaluating method。the procedure of evaluation is quantitated preferably.At last，the result of evaluation for the cable-stayed bridges stability is drawn through the model of the multi-grade fuzzy synthesis judge.Consequently，whether the stability of cable-stayed bridges is satisfying is known . References | Related Articles | Metrics

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Analysis of Cracks Generating in the Course of Laying Aside Pre-Cast Beam ZAI Guo-jun,ZHOU Zhi-xiang 2007, 26(6): 38-42.  Abstract ( )   PDF (232KB) ( )   Aiming at the problem that pre-cast beam generated cracks in course of laying aside it，the mechanics knowledge Was utilized to deduce the formula，and the tensile stress under different descending value of temperature Was calculated according to the engineering，and the finite element software ANSYS Was used to verify the formula.The conclusion Was put forward that if the bearings of pre-cast beam were incorrectly installed when it Was laid aside，and the sudden descending of temperature may result in cracks ，then the corresponding avoidance measure was suggested . References | Related Articles | Metrics

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Mechanism and Precautionary Measures for Cracking of Pre-Stressed Concrete Continuous Box Girder of Continuous and Rigid Frame Bridges in Service Phase CHEN Yu-feng,LUO Ling,WANG Wei-hong,WANG Yun-tao,XU Jun-Lan 2007, 26(6): 43-45.  Abstract ( )   PDF (212KB) ( )   Based on the cracking investigation，some inclined cracks in webs apprearing in the continuous prestressed concrete box girder bridge in service phase are analyzed.Main factors inducing cracks are considered.such as temperature gradient，vehicular load，principal tensile stress of concrete，fatigue under temperature load and vehicular load.Proper temperature gradient should be selected in design phase to avoid crack.Some anti-rust coatings Can be daubed on the surface of the steel strands to protect them from corrosion by cavity seepage.Webs of box girder from one quarter to three quarters of each span may be poured with steel fiber reinforced concrete to avoid fatigue effect. References | Related Articles | Metrics

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Reason Analysis and Countermeasures for Excessive Deflection of Midspan in Long-Span Continuous Rigid Frame Bridges QI Dong-chun,ZHANG Yong-shui,LI Qiang 2007, 26(6): 46-49.  Abstract ( )   PDF (214KB) ( )   The excessive deflection in the midspan is one of the main faults in long-span continuous rigid frame bridges.This paper make a comprehensive analysis for the causes of the excessive deflection and find out the countermeasures for this problem. References | Related Articles | Metrics

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Calculation and Analysis of Lateral Displacement at the Top of Higher Bridge Pier MA Zhao-xia,CHEN Si-tian,GONG Shang-long 2007, 26(6): 50-54.  Abstract ( )