Study on Restoring Characteristics of Reinforced Concrete Open-Section Shear Walls Subjected to Bi-directional Horizontal Force

U形或L形截面剪力墙是建筑结构中常见的抵抗地震作用的剪力墙。在分析这类结构时，通常将开洞墙分解为单个平面构件，并假定这些构件只在其平面方向上有效地贡献分离平面墙的平面内刚度和强度。本文通过两个系列的试验，为建立此类墙体的弹塑性力学模型提供了基础数据，并对两个系列的试验结果进行了分析比较，得出了两个系列的试验结果：一个系列的试验结果为试验结果的分析提供了基础数据，另一个系列的试验结果为试验结果的分析提供了依据; 1）钢筋混凝土平面剪力墙在弯剪共同作用下的受弯特性试验; 2）钢筋混凝土不等边l形截面剪力墙在双向作用下的恢复特性试验。试验的主要结果如下：1）平面剪力墙在钢筋开始弯曲屈服前的曲率分布可以近似地用一条三次曲线来表示，2）对L-1000型钢筋混凝土柱的双向极限抗弯承载力进行了研究，结果表明，L-1000型钢筋混凝土柱的双向极限抗弯承载力与墙体的竖向抗弯承载力基本一致。形截面剪力墙可以由双向荷载平面上三种弯曲破坏模式的计算值绘制的三角形来估算。

The shear walls with a U or L shaped section are commonly in building structures to resist the lateral forces imposed by earthqakes. In the analysis of such structures the open-section walls are usually disassembled to the single plane components which are assumed to contribute only in-plane stiffness and strength of separated plane walls effective in their own plane direction. However, in order to estimate the proper behaviors of open-section walls subjected to lateral forces, it must be treated as the integrated open-section walls conforming to their overall proper structural characteristics.In this research project, following two series of tests were carried out in order to obtain the basic data for preparing the elastic-plastic mechanical model of such walls;1) Tests for obtaining the data on flexural characteristics of reinforced concrete plane shear walls subjected to combined bending and shear.2) Tests for obtaining the data on restoring characteristics of reinforced concrete unequal-sided l-shaped section shear walls subjected to bi-directional horizontal force.The main results of this tests are as follows;1) The distribution of plane shear wall's curvature before reinforcing bar starting to yield by flexure can be nearly expressed by a cubic curve, so that fiexural deformation can be estimated from the curvature of wall base.2) The bi-directional ultimate bending strength of L-shaped section shear walls can be estimated from the triangle plotted the calculated value from three patterns of bending failure on a bi-directional loads plane.