传统风格建筑钢框架结构拟静力试验研究

为研究传统风格建筑的钢框架结构的破坏形态和抗震性能，以位于抗震设防烈度8度区的一传统风格建筑钢框架结构为原型，按1∶2缩尺比例制作了试验模型，对其进行了低周反复加载试验。试验中观察了钢框架结构的受力过程及破坏形态，得到了结构的荷载-位移滞回曲线、骨架曲线、应变特征、延性、耗能性能、刚度与承载力退化等。试验结果表明: 传统风格建筑钢框架结构的斗、栱构件在水平荷载作用下可作为第一道抗震防线，梁端塑性铰发展充分，满足“强柱弱梁、强节点弱构件”的抗震要求；滞回曲线出现捏拢现象，呈Z形变化，表现出剪切滑移特征，与常规钢框架结构有明显的差异；在加载前期刚度退化较为显著；结构破坏时，极限位移角达到1/20，承载力退化系数接近0.9，表现出良好的抗倒塌能力和稳定的承载力。

Quasi-static test on steel frame structure in traditional style buildings

In order to investigate the seismic behavior and failure mode of steel frame structures of traditional style buildings, the low cyclic reversed loading test was carried out on a 1∶2 scaled model of a steel frame structure of traditional style building built in the areas with a seismic design intensity of 8 degree. The failure process and patterns of the structure were observed. The mechanical behaviors such as load-displacement hysteretic loops, skeleton curves, strain characteristics, ductility, energy dissipation, stiffness degradation and load bearing capacity degeneration of the frame were obtained. Test results show that the Dou and Gong components of the Chinese traditional style steel frame structures act as the first seismic line under the action of horizontal load, the plastic hinge at the beam end develops fully and the seismic design principle of ‘strong column-weak beam, strong core zone-weak members’ is satisfied. The pinching phenomenon of hysteretic loops appears, and it is Z-shaped, indicating shear-slip property, which shows obvious difference compared to conventional steel frame. The stiffness degradation of the structure is significant at the early stage of the loading. At failure, the ultimate elasto-plastic drift ratio and the bearing degradation coefficient is 1/20 and 0.9, respectively, indicating the excellent collapse resistance capacity and stable load bearing capacity of the steel frame structures of traditional style buildings.