Experimental Investigation of the Strength Stiffness and Deformaton Capacity of Slender Reinforced Concrete Walls

在过去的20年里，许多钢筋混凝土建筑在破坏性地震中表现出令人满意的性能，这归功于结构墙的存在。结构墙为建筑系统提供刚性，并控制建筑中的漂移和损坏。地震区结构墙设计的一个关键问题是钢筋细节的规范，以确保延性反应。1985年3月智利地震期间，维纳德尔马尔的建筑表现似乎与专业意见相矛盾，因为这些建筑表现良好，加固细节基本上不存在。这项研究项目开发了确定钢筋混凝土墙的强度、有效刚度和变形能力的方法。在许多钢筋混凝土结构中，墙被用作主要的抗侧向荷载体系，但许多基本概念还没有得到试验验证。该项目的试验阶段包括钢筋混凝土墙的水平荷载测试。主要变量包括横截面的几何形状、腹板配筋量、荷载类型和约束配筋量。承受静载反转和动载作用的墙体。该项目的分析阶段使用观测到的响应和实验的测量响应来开发适用于复制剪切和弯曲的非线性响应的滞后模型。提出了在设计过程中确定结构墙的强度、可能的破坏模式和有效刚度的方法。

During the past 20 years, the satisfactory behavior of many reinforced concrete buildings during damaging earthquakes has been attributed to the presence of structural walls. Structural walls provide stiffness to the building systems, and control the drift and damage in the buildings. A critical concern for the design of structural walls in seismic regions has been the specification of reinforcement details to insure ductile response. The performance of buildings in Vina del Mar during the March 1985 Chilean earthquake appears to contradict professional opinion, because the buildings performed well and the reinforcement details were essentially nonexistent. This research project develops methods for determining the strength, effective stiffness, and deformation capacity of reinforced concrete walls. Walls are used as the primary lateral-load resisting system in many reinforced concrete structures, yet many fundamental concepts have not been verified experimentally. The experimental phase of the project involves lateral load tests of reinforced concrete walls. Major variables include the geometry of the cross section, amount of web reinforcement, type of loading, and amount of confinement reinforcement. Walls subjected to static load reversals and dynamic loading. The analytical phase of the project uses the observed response and the measured response of the experiments to develop a hysteresis model suitable for reproducing nonlinear response in shear and flexure. Methods are developed to determine the strength, likely mode of failure, and effective stiffness of structural walls during the design process.