基于塑性铰模型的三塔斜拉桥抗震能力时程分析  

Seismic resistance capacity of cable-stayed bridge with three pylons based on plastic hinge model

作　　者：王龙飞[1] 王仙芝[2] 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]广东水利电力职业技术学院,广州510635

出　　处：《振动与冲击》2012年第15期165-170,179,共7页Journal of Vibration and Shock

基　　金：中央高校基本科研业务费专项资金资助(2010-ZY-TJ-037)

摘　　要：采用非线性塑性铰考虑结构构件的混凝土开裂、钢筋屈服和材料滞回效应,利用APDL语言编制二分法程序使计算机进行自动计算和减少计算量,从而建立通过不断增大地震时程作用来计算斜拉桥结构抗震能力的方法,并以该方法分析研究了一座在建的三塔结合梁斜拉桥的抗震能力和地震反应特性。研究结果表明:在抗震能力状态,三塔斜拉桥中塔底内力响应要远大于边塔,但由地震引起的塔顶位移却相差很小,所以提高中塔抗震能力可以较快地提高整体结构的抗震能力;有塑性铰模型要比无塑性铰模型具有更高的计算抗震能力;采用二分法循环计算程序,不仅可以降低人工试算的烦琐程度而且能大幅减少循环计算次数,使大型结构的抗震能力分析较为简便。Considering the effects of concrete crack,reinforcement yielding and hysteresis of structural components after adopting nonlinear plastic hinges,and using the language of APDL to write a bisection method program for automatic analysis and time reduction,a method of analyzing seismic resistance capacity of cable-stayed bridge was established,in which the seismic load is acted increasingly step by step.The seismic resistance capacity and responses of a composite girder cable-stayed bridge with three pylons under construction was investigated.The results show that the force responses at bottom of the middle pylon are much greater than at that of side pylons,but the deflection responses in the top of pylons caused by the seismic action are very close.So,increasing the capacity of the middle pylon to resist earthquake can improve the seismic resistance capacity of the whole bridge.The calculating seismic resistance capacity of the model with plastic hinges is higher than that with no plastic hinges.The bisection method program for loop calculation can reduce the trivial manual operation work and decrease the times of loop calculation.By using the method,it is convenient to analyze the seismic resistance capacity of large structures.

关 键 词：抗震能力 非线性塑性铰 抗震能力状态 地震反应 二分法程序 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]