矮塔混凝土斜拉桥成桥索力优化

针对矮塔混凝土斜拉桥结构受力特点,推导出了在恒载、车辆荷载、温度作用下整体弯曲能量表达式,以结构整体弯曲变形能最小为目标,主梁主塔单元弯矩和轴力为约束条件,应用MIDAS/CIVIL 2010的未知荷载系数模块进行了最不利荷载组合作用下矮塔混凝土斜拉桥成桥索力优化计算分析.讨论了车辆荷载和温度作用对矮塔斜拉桥成桥索力优化结果及大桥结构内力分布的影响,研究结果表明,车辆荷载和温度作用对拉索索力、主梁弯矩等力学参数的影响较大,在进行成桥索力优化时应该考虑车辆荷载和温度作用.

Optimization of bridge-completing cable force for extradosed concrete cable-stayed bridges

Aiming at the loading behavior of extradosed concrete cable-stayed bridges(ECCB),the global bending energy equation of the structure under the effects of dead load,vehicle load and temperature is deduced.Taking the minimum global bending energy as a target and the moments and axial forces of main girder and tower elements as restriction conditions,the optimization of bridge-completing cable force for ECCB is carried out under the most unfavorable combination of the loads by the unknown load coefficient module in MIDAS/CIVIL 2010.The influences of vehicle load and temperature on the optimal results of bridge-completing cable force for ECCB and the distribution of bridge internal force are discussed.The results show that the vehicle load and temperature have a considerable effect on the cable tension,the moment of main girder and other mechanical parameters.Thus,the vehicle load and temperature should be taken into consideration in the optimization of bridge-completing cable force.