两边连接暗支撑预制墙板抗震性能分析

Aseismic performance analysis of prefabricated wallboard with concealed braces connected on both sides

提出了一种适用于多、高层装配式钢框架结构的两边连接暗支撑预制墙板。对6个2/3缩尺的暗支撑预制墙板试件进行低周往复循环水平剪力加载试验,分析了几种典型的破坏模型,并对不同试件的抗剪承载力、延性和耗能能力进行研究。试验结果表明:暗支撑预制墙板具有良好的延性和耗能能力,减小剪跨比、增大墙厚能有效提高预制墙板抗剪承载力,但其峰值位移会降低至原来的1/2;设置暗柱构能有效提高预制墙板抗剪承载力;试件的上部连接、T型件与暗支撑骨架下部焊缝为薄弱位置,应对其局部加强,上部连接宜采用长圆孔构造,防止螺栓剪切破坏。有限元参数化分析的结果表明:提高混凝土强度,对暗支撑预制墙板的峰值荷载影响较小,但采用C30以上混凝土能有效提高其屈服荷载;当钢支撑用钢量相同时,相较于增大截面厚度,增大截面宽度对墙板抗剪承载力提升的影响更为显著。

Here,a prefabricated wallboard with concealed braces connected on both sides suitable for multi-story and high-rise fabricated steel frame structures was proposed.Six specimens of concealed braced prefabricated wallboard with 2/3 scale were tested under low-cycle cyclic horizontal shear loading,several typical failure models were analyzed,and the shear-bearing capacity,ductility and energy dissipation capacity of different specimens were studied.The test results showed that the concealed braced prefabricated wallboard has good ductility and energy dissipation capacity,reducing shear-span ratio and increasing wall thickness can effectively improve the shear-bearing capacity of the prefabricated wallboard,but its peak displacement can be reduced to 1/2 of the original one;setting concealed column structure can effectively improve the shear-bearing capacity of the prefabricated wallboard;upper part connection of specimens and the weld between T-shaped piece and lower part of concealed brace framework are weak positions,they should be locally strengthened;upper part connection should adopt long round hole structure to prevent bolt shear failure.The finite element parametric analysis results showed that increasing concrete strength has less effect on peak load of the prefabricated wallboard,but using concrete above C30 can effectively improve yield load;when the steel amount used for steel brace keeps the same,increasing section width is more significant than increasing section thickness for improving shear-bearing capacity of prefabricated wallboard.