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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。
In order to study the anti-side performance of prestressed concrete shear walls, a nonlinear finite element analysis model based on fiber elements is proposed and established based on the experimental research. Based on the elemental model of fiber beam and column of conventional compliance method, this model improves integral method of plastic zone, and puts forward an integral method which is more suitable for concrete structure. In order to consider the bond-slip and shear deformation between the steel bar and the concrete, two zero-length units are introduced, and the construction of zero-length unit and the suggestion of parameter values are proposed. The analysis model is not observed in the test, but the possible failure modes (such as the failure of prestressing tendons) are taken into consideration. The horizontal load-displacement hysteresis characteristics of the specimen wall, the stress of prestressing tendons, Open and residual deformation indicators were simulated and compared with the test results. The results show that the two are in good agreement with each other to verify the rationality and effectiveness of the analysis model.