SENSITIVE ANALYSIS AND MODEL MODIFICATION FOR FINITE ELEMENT ANALYSIS OF R/C BRIDGE PIERS UNDER CYCLIC LOADING
-
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。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.
-
Keywords:
- structural engineering /
- finite element /
- R/C bridge piers /
- hysteretic behavior /
- ANSYS software
-
计量
- 文章访问数: 1394
- HTML全文浏览量: 14
- PDF下载量: 648
下载:
