桁架式钢骨混凝土梁－钢骨混凝土柱梁柱组合构件抗震性能试验研究

摘要

A new type of frame joint with steel reinforced concrete (SRC)column-reinforced concrete (RC)beam encased steel truss was put forward.Reversed cyclic loading tests on eight specimens were conducted to intensively investigate the seismic behaviors of the beam-column combined components.The failure processes of eight frame joints under low-cyclic reversed loading were observed and recorded.And the load-displacement hysteretic loops,shear behavior of the joint core,skeleton,curve,load-intersection angle hysteretic loops etc.of the test subassemblies were tested.Then the seismic behaviors such as the ductility,energy dissipation capacity,and strength and stiffness degradations were analyzed.The influential factors,such as the steel proportion,axial compression ratio and size of angle iron's web member,on the mechanical performance of joints were discussed.The results indicate that the joints with SRC column RC beam encased steel truss have good ductility and energy dissipation capacity.It provides theoretical basis for engineering application of this kind of structures.%提出了一种由桁架式钢骨混凝土（SRC）梁和钢骨混凝土（SRC）柱组成的框架结构新的节点形式。为了研究这种新型梁柱组合构件的抗震性能，对8个桁架式钢骨混凝土梁－钢骨混凝土柱框架边节点进行了低周反复荷载试验。试验观察并记录了各节点试件的破坏形态，测得其梁端荷载－位移滞回曲线、节点剪切变形、骨架曲线和梁端荷载－转角滞回曲线。以试验结果为基础，对节点的延性、耗能性能、承载力及刚度退化等抗震耗能性能进行了分析，讨论了含钢率、轴压比及角钢腹杆尺寸对节点受力性能的影响。研究结果表明，这种新型桁架式钢骨混凝土框架节点具有良好的延性及耗能性能，为其工程应用提供了理论依据。