填充墙的平面内损伤对其平面外承载力折减系数的影响

Effects of In-Plane Damage of infill Walls on Their Out-of-Plane Bearing Capacity Reduction Factors

在真实地震场景下,填充墙一般会受到平面内和平面外两个方向共同的地震作用。填充墙的平面内和平面外抗震性能之间存在着较强的耦合作用,平面内损伤会导致平面外承载力降低。建立填充墙钢筋混凝土(RC)框架的有限元模型,通过模拟结果与试验数据的对比验证了模型的有效性,并利用模型进行了数值分析,探讨了砌体填充墙在双向荷载下的抗震性能以及加载模式、高宽比、高厚比和砌块抗压强度对填充墙平面内损伤后的平面外承载力的影响。最后,在试验数据和数值分析结果的基础上,提出了填充墙的平面内损伤对平面外承载力的折减系数计算式。该计算式基于填充墙平面外荷载传递机制,引入了一个综合考虑水平和竖直两个方向的几何参数。与现有计算式相比,新计算式与试验数据的拟合情况较好。

Infill walls are commonly subjected to bidirectional seismic actions in actual seismic events.A robust interaction prevails between the in-plane and out-of-plane seismic performance of infill walls,where in-plane damage often diminishes the out-of-plane bearing capacity of infill walls.A finite element model for RC frames with infill walls was established and validated against experimental data,and extensively employed in numerical analysis.The objective was to delve into the seismic performance of masonry infill walls under bidirectional loading,considering the effects of loading modes,aspect ratio,slenderness ratio,and block compressive strength on the out-of-plane bearing capacity of infill walls with prior in-plane damage.Based on experimental data and parameter analysis,a formula for predicting out-of-plane bearing capacity reduction factors of masonry infill walls with prior in-plane damage was proposed.A new comprehensive geometric parameter was introduced considering the mechanism of out-of-plane load transfer for infill walls.The new formula exhibited a superior fit with experimental data compared to existing equations.