Specimen W2-D: Structural wall with geometric and reinforcement discontinuities subjected to lateral loads

Two walls with an opening (one each) were tested under static lateral loads. The specimens were proportioned to represent structural walls with elevations resembling the shape of upside-down trousers. The load point (see drawings) meant to represent the ground level (referred to as Section S1) and the section 4 ft north of the load point (referred to as Section S2) represented the bottom end of the lower opening. The walls on either side of the opening were referred to as wall legs and were coupled through plates meant to represent the coupling effects of slabs. The region of wall with no opening and bounded by Sections S1 and S2 was referred to as wall podium, and was meant to represent the first-story aboveground. The wall podium segment immediately adjacent to the opening was referred to as panel zone. Both walls had continuous boundary longitudinal reinforcement along their exterior edges. In addition, along each edge of the opening, boundary longitudinal reinforcement was provided. In wall W2-C, this reinforcement was anchored beyond the load point (i.e., in a region intended to represent the foundation). In wall W2-D, this reinforcement was anchored in the wall podium (i.e., region meant to represent the first story). The walls were loaded slowly and in one direction (downwards) first (Trial 1: first pull). After it was judged that each specimen had reached its full strength in that direction, each specimen was rotated 180 degrees about its longitudinal axis and reloaded to failure (Trial 2: Second pull).

本试验针对两面各开设一处洞口的墙体开展静力侧向荷载（static lateral loads）试验。试件按比例设计以模拟立面呈倒裤形的结构墙体。加载点（详见试验图纸）代表地面层，记为S1截面；加载点北侧4英尺处的截面记为S2截面，代表下部洞口的底端。洞口两侧的墙体被称为墙肢（wall legs），并通过模拟楼板连接作用的连接板实现耦连。S1与S2截面之间无开洞的墙体区域被称为墙台（wall podium），用于模拟地上一层结构；紧邻洞口的墙台区段被称为节点域（panel zone）。两面墙体的外边缘均布置有连续的边缘纵向钢筋（boundary longitudinal reinforcement），此外洞口的每一侧边缘也均配置了该类钢筋。其中W2-C墙体的此类钢筋锚固于加载点之外，即代表基础的区域；而W2-D墙体的此类钢筋则锚固于墙台内，即代表地上一层的区域。试验首先以单方向（向下）慢速加载，即试验1：首次受拉。待判定各试件在该方向达到极限承载力后，将其绕纵轴旋转180度，再次加载至破坏，即试验2：二次受拉。