装配式高强钢组合延性桁框结构滞回性能研究

Research on hysteretic behavior of prefabricated special truss moment frame fabricated with high-strength steel

为研究装配式高强钢组合延性桁框结构(HSS-PSTMF)的抗震性能并扩展其工程应用,通过ABAQUS有限元软件建立了不同耗能段长度和节间数量的HSS-PSTMF模型;对装配式高强钢组合延性桁框结构的滞回性能进行了数值分析,研究了耗能段长度、节间数量及长深比对结构承载力、刚度、延性和耗能能力的影响规律。结果表明:延性桁框结构(STMF)体系中主要通过耗能段耗散地震能量;改变耗能段长度对结构的承载力、延性、刚度、耗能能力影响较大;当耗能段长度一定时,改变耗能段节间数量对结构的承载力、延性、耗能能力影响较小;耗能段长度介于0.2L~0.4L(L为跨度)之间且耗能段任何节间的长深比在0.67~1.5时结构抗震性能较好;耗能段长度介于0.4L~0.5L时,在满足结构安全性要求的前提下,可以将结构的长深比提高到3。

In order to study the seismic performance of prefabricated special truss moment frame fabricated with high-strength steel(HSS-PSTMF)and expand its engineering applications,the HSS-PSTMF models were established using ABAQUS finite element software for different energy dissipation section lengths and number of internodes.The numerical analysis was conducted on the hysteresis performance of prefabricated special truss moment frame fabricated with high-strength steel.The influences of the length of energy dissipation section,the number of internodes,and the length-to-depth ratio on the structural bearing capacity,stiffness,ductility,and energy dissipation capacity were studied.The results show that in special truss moment frame(STMF)system,seismic energy is mainly dissipated through energy dissipation sections.Changing the length of energy dissipation section has a significant impact on the bearing capacity,ductility,stiffness,and energy dissipation capacity of structure.When the length of energy dissipation section is constant,changing the number of internodes has a relatively small impact on the structural bearing capacity,ductility,and energy dissipation capacity.The seismic performance of structure is better when the length of the energy dissipation section is between 0.2 L-0.4L(L is span)and the length-to-depth ratio of any internodes of energy dissipation section is between 0.67-1.5.When the length of energy dissipation section ranges from 0.4 L to 0.5 L,the length-to-depth ratio of structure can be increased to 3 while meeting the safety requirements of structure.