内嵌轻质墙板L形方钢管混凝土组合柱框架结构抗震性能试验与数值模拟

Seismic Performance Test and Numerical Simulation of the L-Shaped Column Composed of Concrete-Filled Square Steel Tube Column Frames with Embedded Lightweight Panels

针对内嵌轻质墙板双钢板连接L形方钢管混凝土组合柱(LCFST柱)框架结构的抗震性能,设计并制作了未安装墙板的LCFST柱框架试件SJ-1和内嵌轻质墙板的LCFST柱框架试件SJ-2进行低周反复荷载试验,并通过有限元软件对内嵌墙板厚度、墙板强度进行参数化分析.试验结果表明:两框架结构属于“强柱弱梁”的破坏模式;SJ-2中墙板破坏多出现墙板顶端和角部,内嵌墙板可在一定程度上延缓主体框架的破坏;SJ-1和SJ-2均具有良好的耗能能力、延性和变形能力;SJ-2较SJ-1,正、负向弹性刚度、极限承载力均有明显提高,耗能能力比SJ-1略有增加.参数分析表明:增大墙板的厚度或强度,整体结构初始刚度的提升很小,但其峰值荷载的提升较为明显;其中墙板厚度由100 mm增至200 mm,墙板对峰值荷载的贡献率从22.76%提升至30.70%;墙板强度由2.5 MPa增至7.5 MPa,墙板对主体结构峰值荷载的贡献率从23.68%提升至34.52%.

The L-shaped column composed of concrete-filled square steel tube(LCFST)column frame specimens SJ-1 without wall panels and SJ-2 with embedded lightweight panels were designed and manufactured for a pseudo-static test because of the seismic performance of the LCFST column frame structure with double steel plate connection and embedded lightweight panel,and the thickness and strength of the inner wall panel were parameterized by finite element software.The test results show that the two-frame structure belongs to the failure mode of“strong column and weak beam”.In SJ-2,wall panel destruction mostly occurs at the top and corner of the wall panel,and the embedded wall panel can delay the main frame destruction to a certain extent.Both SJ-1 and SJ-2 have good energy dissipation capacity,ductility,and deformation capacity.The positive and negative elastic stiffness and ultimate bearing capacity are significantly improved,and the energy dissipation capacity is slightly increased in SJ-2 compared with SJ-1.The parameter analysis shows that the initial stiffness of the whole structure increases a little with the increased thickness or strength of the wall panel,but its peak load increases obviously.The contribution rate of the wall panel to peak load increases from 22.76%to 30.70%when the thickness of the wall panel increases from 100 mm to 200 mm,respectively.The wall panel strength increases from 2.5MPa to 7.5MPa,and the contribution rate of the wall panel to the peak load of the main structure increases from 23.68%to 34.52%.