基于纤维单元的预应力预制混凝土剪力墙抗侧性能数值分析

为研究预应力预制混凝土剪力墙的抗侧性能，在试验研究的基础上，提出并建立了基于纤维单元的非线性有限元分析模型。该模型在常规柔度法纤维梁柱单元模型的基础上，对单元塑性区积分法加以改进，提出了更加适用于混凝土结构的积分方法。为考虑墙底钢筋与混凝土的黏结滑移及剪切变形，引入两个零长度单元，提出了零长度单元的构建和参数取值建议。该分析模型对试验中虽未观察到，但可能发生的失效模式（如预应力筋失效等）给予考虑，对试件墙片水平荷载-位移滞回特征、预应力筋应力、墙角接缝张开、残余变形指标等进行模拟并与试验结果进行比较，结果表明两者较为吻合，验证了该分析模型的合理性和有效性。

Numerical analysis on lateral performance of prestressed precast concrete shear walls based on fiber element

In order to investigate the performance of prestressed precast concrete shear walls under lateral loading, a nonlinear fiber-element-based model was proposed and developed on the basis of previous experimental work. The proposed modeling approach was based on the commonly known fiber model using force-based beam-column element, yet had been improved in the integration method for the plastic hinge element, which is more appropriate for modeling reinforced concrete structures. To account for the effects of bond-slip behavior of longitudinal reinforcing steel and shear deformation at the wall base, two zero-length elements were introduced in the model, and the configuration and associated parameters were also presented. Failure modes (such as failure of prestressed strands) that were not observed in the test, but may potentially occur, had been reasonably taken into account in the proposed modeling approach. Comparisons of various responses, such as lateral force-displacement hysteretic behavior of wall, stresses of prestressed strands, gap opening at wall toe and residual deformation were conducted between the analytical and experimental results. The good agreement between analytical and experimental results demonstrates the validity and efficiency of the proposed modeling approach.