【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。更多还原

【Abstract】 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.更多还原