钢板带加固砖填充墙RC框架抗震性能试验研究

为研究钢板带加固砖填充墙RC框架的抗震性能，设计了缩尺单层单跨的纯RC框架1个、砖填充墙RC框架1个以及钢板带加固砖填充墙RC框架2个，考虑砂浆强度的影响，并对钢板带施加一定的预应力。基于低周往复荷载试验，对比分析了不同类型框架的破坏过程、滞回曲线、骨架曲线、刚度、延性和耗能能力。结果表明：钢板带加固砖填充墙RC框架可提高其承载力与耗能能力，但位移延性系数略有下降；钢板带加固基本不影响砖镇充墙RC框架的初始抗侧刚度，但是在层间位移角为1/100~1/50时，割线刚度可以提高24.6%~31.9%；螺栓孔对水平灰缝的削弱会影响填充墙的破坏形态；砂浆强度的提高会增加钢板带加固砖填充墙RC框架的初始抗侧刚度、峰值荷载与耗能能力。此外，提出了预应力钢板带加固砖填充墙RC框架的水平承载力计算方法，具有较好的预测精度。

Experimental investigation on seismic performance of RC frame infilled with brick wall strengthened by steel strips

In order to investigate the seismic performance of RC frames infilled with brick walls strengthened by steel strips, one single-story single-span scaled RC frame, one scaled RC frame with infilled brick walls, and two RC frames infilled with brick walls strengthened by steel strips were designed. The influence of mortar strength was considered, and a certain prestressing force was applied to the steel strips. Based on the low-cycle reversed loading test, the failure process, hysteretic curve, skeleton curve, stiffness, ductility and energy dissipation capacity of the frames were compared and analyzed. The results show that using steel strips to strengthen the RC frame with infilled brick walls can improve its capacity and energy dissipation, but the displacement ductility coefficient decreases slightly. Using steel strips for strengthening hardly affects the initial lateral stiffness of the RC frame with infilled brick walls, but the secant stiffness can be increased by 24.6%-31.9% corresponding to the inter-story drift ratio from 1/100 to 1/50. The weakening of the bolt hole on the horizontal gray seam will affect the failure mode of the infilled wall. The increase in the strength of the mortar will increase the initial lateral stiffness, peak load, and energy dissipation capacity of the specimen. In addition, the calculation method of the lateral bearing capacity of the RC frame infilled with brick wall strengthened by prestressing steel strips was proposed, which has good prediction accuracy.