竖向分布钢筋不连续的装配式剪力墙结构振动台试验研究

为研究竖向分布钢筋不连续的装配式剪力墙结构抗震性能，设计了1个缩尺比为1/2的四层模型结构，并对其开展振动台试验。试验中考虑了7度多遇至9度罕遇等地震烈度(0.035g~0.62g)，并进行了峰值加速度0.80g的El Centro波破坏加载。研究结果表明：在7度罕遇地震作用下，模型结构处于弹性状态，最大层间位移角仅1/991；模型结构进入塑性阶段后(8度罕遇和9度罕遇地震作用)，现浇边缘构件产生水平裂缝并跨越竖向拼缝向预制墙体发展，模型结构频率和阻尼比大幅变化，最大层间位移角为1/125；在峰值加速度0.80g的El Centro波作用下，模型结构发生典型的压弯破坏，一层现浇边缘构件混凝土局部压坏，钢筋压曲，但未发生整体破坏或倒塌；模型结构的1阶频率和阻尼比分别降低58.3%和增大163.2%，层间位移角达1/87；该剪力墙结构整体变形呈弯曲型，其现浇边缘构件和预制墙体具有良好的协同工作能力，抗震性能良好。

Shaking table test on a precast concrete shear wall structure with discontinuous vertical distributing reinforcements

In order to study the seismic performance of the precast concrete shear wall with discontinuous vertical distributing reinforcements, a shaking table test of a half-scale four-story precast concrete shear wall structure was conducted. The seismic intensity levels ranging from frequent seven degree to rare nine degree (0.035g-0.62g), and an additional El Centro wave with the peak acceleration of 0.80g was adopted in the test. The test results show that the model is in the elastic state under seven degree ground motions, and the maximum inter-story drift is 1/991. Comparatively, in the plastic stage of the model (rare eight degree and rare nine degree), horizontal cracks are observed on the boundary elements and propagate along the precast wall slab. The maximum inter-story drift reaches 1/125 with significant changes in the frequency and damping ratio. Eventually, typical bending failure appears under the El Centro wave of 0.80g. The cast-in-situ boundary elements at the ground floor are partially crushed, and the longitudinal bars inside are buckled. The primary frequency decreases by 58.3%, and the damping ratio increases by 163.2%. Moreover, there is no overall damage or collapse with the maximum inter-story drift of 1/87. The overall deformation of the innovative shear wall is primarily due to flexural stresses. The cast-in-situ boundary elements and precast walls could still work together well, and the structure exhibits a superior seismic performance.