A Study of Behavior and Design of Reinforced Concrete Shear Walls With Unsymmetrical Cross-Section

在钢筋混凝土结构抗震设计中，剪力墙常采用l型或T型。这些不对称“法兰墙”的横向荷载行为还不清楚。未对长径比大于2的非对称凸缘壁进行实验研究。也没有建议提供适当的分析或设计程序的指导。本项目涉及非对称法兰剪力墙的分析和实验研究。将对旧金山湾区的两座剪力墙主体建筑进行详细的分析研究，使用1989年洛马普里塔地震及其余震记录的仪器响应数据。分析研究旨在通过比较测量和计算的响应来研究横向荷载响应的建模技术。试验研究将涉及四个不同法兰宽度和配筋率的试件的设计、施工和测试。这些试件将受到反向循环横向加载和恒定轴向应力的影响，以研究墙体的刚度、强度和变形特性。使用非线性有限元技术的详细分析研究将用于评估现有的分析模型并开发新的分析模型。结合分析和实验研究的目的是建立分析模型、比例和非对称法兰剪力墙抗震细节的指导方针。

In seismic design of reinforced concrete structures using shear walls L-shaped or T- shaped walls are often used. The lateral load behavior of these unsymmetrical "flanged walls" is not well understood. No experimental studies have been conducted on unsymmetrical flanged walls with aspect ratios greater than two, and no recommendations exist to provide guidance on appropriate analysis or design procedures. This project involves both analytical and experimental studies of unsymmetrical flanged shear walls. Detailed analytical studies will be conducted on two shear wall dominant buildings in the San Francisco Bay Area with instrumented response data recorded from the 1989 Loma Prieta earthquake and its aftershocks. The analytical studies are designed to investigate modeling techniques for lateral load response by comparing measured and computed responses. The experimental studies will involve the design, construction, and testing of four specimens with different flanged widths and reinforcing ratios. The specimens will be subjected to reversed cyclic lateral loading and constant axial stress to investigate stiffness, strength, and deformation characteristics of the walls. Detailed analytical studies using nonlinear finite element techniques will be used to evaluate existing analytical models and to develop new analytical models. The objectives of the combined analytical and experimental studies will be to establish guidelines for analytical modeling, proportioning, and detailing of unsymmetrical flanged shear walls for earthquake resistance.