大型火电厂钢结构主厂房框排架结构拟静力试验研究

对1榀3跨5层的钢框排架主体结构进行了低周反复加载试验，观测了框排架的破坏形态，得到了试件的荷载-位移滞回曲线、骨架曲线，分析了钢框排架的破坏机制、滞回性能、延性、耗能能力、刚度退化等力学性能。结果表明：钢框排架结构的破坏机制为先梁端后柱端出现塑性铰的混合破坏机制，滞回曲线较饱满，整体位移延性系数大于4.0，等效黏滞阻尼系数达到0.189。钢框排架结构体系总体上表现出良好的抗震能力，适合高烈度抗震设防区采用。模型结构的层间位移角在底层和第二层较大，为薄弱层；煤斗梁地震反应较强，设计时要特别注意。

Quasi-static test of steel frame-bent structures of large thermal power plant main buildings

Through the experimental study on the model of a three-bay and five-story steel frame-bent structures under low cycle reversed loading,the failure condition of frame-bent structures was observed.The load-displacement,hysteretic loops and skeleton curve of tested model were obtained.The failure mechanism,hysteretic behavior,ductility,energy dissipation capacity and stiffness degradation were investigated.The results show that the failure mechanism of steel frame-bent structures is the first occurrence of beam-hinge and then column-hinge mechanism.The hysteretic loops are plump.The average of the overall ductility factors is greater than 4.The equivalent viscous damping coefficient is 0.189.The steel frame-bent structure exhibits excellent seismic behavior,and can be adopted in high seismic fortification zones.The inter-story drift is relatively large on the bottom story and the second story,namely the weak stories.And there are large seismic forces at the coal hopper beams,which must be paid attention in design.