中文摘要：

在最近的地震，很多增强的水泥(RC ) 桥严重地由于桥墩的混合挠曲砍失败模式被损坏。综合试验性、有限的元素(FE ) 分析研究在这篇论文被描述学习在挠曲砍模式失败了的桥墩的地震表演。在第一部分，有圆形的横断面的六 RC 桥墩上的非线性的周期的装载测试试验性地被执行。损坏状态，韧性和能量耗散参数，僵硬降级和墩的抗剪强度被学习并且与对方相比。试验性的结果建议所有墩在展出前在排水量韧性展出稳定的曲折反应直到四易碎砍失败。墩的最终的表演被统治由砍能力由于重要砍裂开，并且在一些情况中，螺线酒吧破裂。在第二部分，为描述墩的 hysteretic 行为的途径建模被使用 ANSYS 软件调查。有不同参数的一套模型与试验性的结果通过比较被选择并且评估。在模仿的 hysteretic 曲线上的具体裂缝，在纵的加强的 Bauschinger 效果，在纵的加强之间的契约滑倒关系和水泥和具体失败表面之间的 shear 保留系数的影响被讨论。然后，一个修改分析模型被介绍，它的精确性被把模仿的结果与试验性的作比较验证。这研究在商业 FE 代码可得到的使用模型并且为研究人员和对使用 ANSYS 软件预言增强的具体结构的 hysteretic 行为感兴趣的工程师被打算。

英文摘要：

In recent earthquakes, a large number of reinforced concrete （RC） bridges were severely damaged due to mixed flexure-shear failure modes of the bridge piers. An integrated experimental and finite element （FE） analysis study is described in this paper to study the seismic performance of the bridge piers that failed in flexure-shear modes. In the first part, a nonlinear cyclic loading test on six RC bridge piers with circular cross sections is carried out experimentally. The damage states, ductility and energy dissipation parameters, stiffness degradation and shear strength of the piers are studied and compared with each other. The experimental results suggest that all the piers exhibit stable flexural response at displacement ductilities up to four before exhibiting brittle shear failure. The ultimate performance of the piers is dominated by shear capacity due to significant shear cracking, and in some cases, rupturing of spiral bars. In the second part, modeling approaches describing the hysteretic behavior of the piers are investigated by using ANSYS software. A set of models with different parameters is selected and evaluated through comparison with experimental results. The influences of the shear retention coefficients between concrete cracks, the Bauschinger effect in longitudinal reinforcement, the bond-slip relationship between the longitudinal reinforcement and the concrete and the concrete failure surface on the simulated hysteretic curves are discussed. Then, a modified analysis model is presented and its accuracy is verified by comparing the simulated results with experimental ones. This research uses models available in commercial FE codes and is intended for researchers and engineers interested in using ANSYS software to predict the hysteretic behavior of reinforced concrete structures.