无焊缝全螺栓连接双钢板混凝土组合剪力墙平面外抗冲击性能有限元分析

Finite element analysis for out of plane anti-impact performance of unwelded steel plate-concrete-steel plate composite shear wall with all bolted joints

为研究无焊缝全螺栓连接双钢板混凝土组合剪力墙在平面外冲击荷载作用下的力学性能,基于ABAQUS软件建立有限元模型并利用已有试验验证该模型的有效性,在此基础上分析了冲击质量、冲击能量、轴压比、截面形式等参数对该组合剪力墙抗冲击能力的影响,获得其破坏模式。结果表明:冲击能量相同时,墙体耗散的能量随着冲击质量的增加而增加;冲击质量相同时,冲击能量的变化能够影响墙体各部件的吸能比;较小的轴压比对墙体抗冲击性能有利,设计时可不考虑轴压比参数,结果偏于安全;墙体端部槽钢开口向内较开口向外其抗冲击性能略有提升;含对拉螺栓的墙体抗冲击性能优于含交错栓钉的墙体。结合有限元分析结果,基于冲击作用下梁的塑性位移计算方法,推导出该组合剪力墙在面外冲击荷载作用下的塑性位移计算公式,计算结果与有限元分析结果吻合较好。

In order to study out of plane anti-impact performance of unwielded steel plate-concrete-steel plate composite shear wall with all bolted joints,its finite element(FE)model was established based on the software ABAQUS and the model effectiveness was verified with the existing test data.Then,effects of impact mass,impact energy,axial compression ratio and cross section form on the wall anti-impact ability were analyzed to acquire its failure mode.The results showed that when the impact energy is the same,the energy dissipated by the wall increases with increase in impact mass;when the impact mass is the same,the change of impact energy can affect the energy absorption ratio of each part of the wall;the smaller axial compression ratio is beneficial to the wall anti-impact ability,the axial compression ratio may not be considered in design and the result is safer;the wall anti-impact performance when the wall end U-steel opening inward is better than that when it opening outward;the anti-impact performance of the wall with split bolt is better than that of the wall with staggered stud;combined with the results of FE analysis,based on the calculation method of beam plastic displacement under impact,the calculation formula of plastic displacement of this wall under out of plane impact load is derived,and its calculation results agree better with the results of FE analysis.