装配式方钢管混凝土柱框架-条板复合墙结构足尺振动台试验研究

为研究装配式方钢管混凝土（CFSST）柱框架-条板复合墙结构的抗震性能，对一个两层房屋足尺模型实施了振动台试验，分析了模型在不同工况下的损伤累积过程，研究了模型动力特性和地震响应的变化规律。结果表明：随着地震波峰值加速度的增大，模型自振频率逐渐降低；在地震波峰值加速度为0.7g前阻尼比逐渐增大，之后略降；楼层加速度放大系数介于1.2～1.8之间，且呈降低趋势。模型在8度基本、8度罕遇地震动作用下的最大层间位移角满足规范限值要求，且残余位移较小。模型内力变化具有阶段性特征：在墙板裂缝贯通前，条板复合墙是主要的抗侧力构件，而CFSST柱框架内力较小；裂缝贯通后，条板复合墙通过内部的摩擦错动一定程度上耗散了台面振动能量，是主要的耗能构件；最终条板复合墙裂解为多个单一条板，但仍具有较强的抗倒塌能力。总体上，条板复合墙和CFSST柱框架变形协调，共同工作性能良好，且墙体拉结措施可靠，符合规范要求。

Full-scale shaking table test of prefabricated CFSST column frames-strip composite wall structure

In order to investigate the seismic performance of prefabricated concrete-filled square steel tubular column frames-strip composite wall structure, a full-scale shaking table test was performed on a two-story building model. The cumulative damage process of the model in different test cases was analyzed, and the evolution regularities of dynamic characteristic and seismic responses were studied. Results show that, with the peak ground acceleration increases, the fundamental frequency of the model decreases gradually. The damping ratio of model increases gradually before the peak ground acceleration increases to 0.7g but slightly decreases later. The acceleration magnification factor of floor is between 1.2 and 1.8, and is in a decreasing trend. The maximum inter-story drift ratios of model under basis and rare earthquake ground motions of 8-degree are lower than the drift ratio limits according to the design code, and the residual inter-story drift of model is small. The evolution of internal force shows phased characteristics. Before the cracks penetrate to the cover of composite walls, the strip composite walls are the main lateral resistance components, while the internal force of CFSST column frames is small. After the cracks penetrate, the earthquake energy from shaking table is dissipated to some degree by the frictional movement of strip wallboards, so the strip composite walls are the main energy-consuming components. The strip composite walls finally split into several strip wallboards, but the test model still has a strong collapse capacity. In conclusion，the strip composite walls and CFSST column frames maintain coordinated deformation and work together well. The connecting mode with reinforcing bar between column and strip wallboards is stable, which meets the seismic design code requirements.