Large-Scale Experimental Evaluation of the Lateral Load Response of Unbonded Post-Tensioned Precast Walls with Horizontal Connections

最近的试验和分析研究表明，使用无粘结后张法可以改善预制梁柱节点子组件的抗震性能。 无粘结后张法在抗震结构体系中的应用，与目前的工业实践相比，是一个重大的创新。 对无粘结后张预应力装配式混凝土水平连接墙体的抗震性能进行了分析研究。 然而，验证壁分析模型所需的实验证据目前还不可用。 本计画旨在评估多层无粘结后张法预制混凝土墙之侧向受力性能。 研究有两个具体目标：（1）验证已开发的墙分析模型，以预测地震荷载下的弯曲墙的行为;（2）这些墙的水平连接的抗剪能力。 循环和单调横向荷载试验将在八面墙的半比例模型上进行。 将使用基于非线性动力分析的两个横向荷载剖面。 第一侧向荷载剖面产生较大的基底弯矩-基底剪力比。 将在此荷载剖面下对5面墙进行测试。 第二个横向荷载剖面产生一个小的基底弯矩-基底剪力比。 将在此荷载剖面下对三面墙进行测试。 将实验结果与预测的行为进行比较，以确定需要改进的模型和方法预测弯曲和剪切滑移行为。

Recent experimental and analytical research has shown the benefits of using unbonded post-tensional to improve the seismic behavior of precast beam-to-column joint subassemblages. Compared with current industry practice, the use of unbonded post-tensional in a seismic structural system is a significant innovation. The seismic behavior of unbonded post-tensioned precast concrete walls with horizontal connections has been investigate analytically. However, the experimental evidence needed to verify the wall analytical model is not currently available. This project is to experimentally evaluate the lateral load behavior of multi-story unbonded post-tensioned precast concrete walls. The research has two specific objectives: (1) to verify the wall analytical model that has been developed to predict the flexural wall behavior under seismic loading; and (2) to qualify the shear capability of the horizontal connections of these walls. Cyclic and monotonic lateral load tests will be performed on half-scale models of eight walls. Two lateral load profiles, based on nonlinear dynamic analyses, will be used. The first lateral load profile produces a large base-moment-to-base shear ratio. Five walls will be tested under this load profile. The second lateral load profile produces a small base-moment-to-base-shear ratio. Three walls will be tested under this load profile. Experimental results will be compared with predicted behavior to identify improvements that need to be made in the models and methods for predicting flexural and shear slip behavior.