钢筋混凝土桥墩滞回性能的有限元参数敏感性分析及模型改进  

SENSITIVE ANALYSIS AND MODEL MODIFICATION FOR FINITE ELEMENT ANALYSIS OF R/C BRIDGE PIERS UNDER CYCLIC LOADING

作　　者：司炳君[1] 孙治国[2] 艾庆华[1] 王东升[2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《工程力学》2009年第1期174-180,186,共8页Engineering Mechanics

基　　金：国家自然科学青年基金项目(50308027);海岸和近海工程国家重点实验室主任基金(LP0504)

摘　　要：研究了反复荷载作用下钢筋混凝土桥墩滞回性能的有限元建模方法,以6个弯剪破坏形态的钢筋混凝土桥墩拟静力试验结果为依据,利用ANSYS软件,首先建立了不同的桥墩有限元模型进行参数敏感性分析,讨论了混凝土的裂缝剪力传递系数、应力-应变曲线的下降段、纵筋的包辛格效应、纵筋与混凝土之间的粘结-滑移关系以及混凝土压碎破坏面等参数对模拟结果的影响;在此基础上对分析模型进行了改进,并将模拟得到的桥墩滞回曲线及骨架曲线同试验结果进行对比,验证了模型的正确性。This paper investigates modeling approaches describing the hysteretic behavior of R/C bridge piers subjected to cyclic loading. Corresponding to the low-cycle reversed loading test of 6 R/C bridge piers, different pier models are created firstly using ANSYS software and evaluated experimentally, where bridge piers are circular-sectioned and flexure ＆ shear dominated. Then, the following related points are discussed including the influences of the shear retention coefficients, the strain softening in the concrete stress-strain relationship, the Bauschinger effect of reinforcing steel, the bond-slip relationship between the longitudinal reinforcement and the concrete, and the effect of concrete failure surface. Finally, a modified analysis model is presented and its accuracy is verified by comparing the calculated hysteretic curves and skeleton cutves with the experimental tesults.

关 键 词：结构工程 有限元 钢筋混凝土桥墩 滞回性能 ANSYS软件 

分 类 号：TU352.1[建筑科学—结构工程] U442.5[建筑科学—桥梁与隧道工程]