中文摘要：

为揭示新型卷边PEC柱（弱轴）-削弱截面钢梁组合框架结构的层间抗震机理,按1∶2缩尺比例设计制作1榀组合框架层间子结构试验试件并进行低周往复荷载试验。基于试验观察和数据整理,对试件结构的破坏过程与破坏模式、滞回特性、刚度退化、耗能能力与变形模式等抗震性能进行分析。结果显示：试件结构最终破坏模式为梁端削弱截面处充分屈服形成塑性铰的理想塑性破坏机构;试件中间层推拉方向位移延性系数μu分别为3.91和3.97,层间最大等效黏滞阻尼系数（ζeq）max=0.359;试件结构侧移分布规律呈理想的倒三角弯剪型变形模式;试件结构在承载力下降到极限承载力的85%时,对应试件层间相对侧移大于4.9%,而节点转角最小值为0.366 rad,均超过大震层间侧移限值下限的1/30,表明试件具有良好的抗倒塌性能。

英文摘要：

In order to examine the seismic mechanism of a new partially encased concrete（ PEC） column（ weak axis）-steel beam（ reduced beam section） composite frame,a 1 ∶ 2 specimen of the inter-story substructure was designed and built. A test of the specimen was conducted with lateral low-cycle repeated loading. Based on the test observation and data analysis,the seismic performance of the specimen,including the failure process,failure mode,hysteretic property,lateral stiffness degradation,energy dissipation capacity,and deformation pattern,was analyzed. Test results show that the failure mode is primarily induced by the plastic hinge forming in the reduced beam section. The displacement ductility coefficients of the inter-story in the pushing and pulling direction are 3.91 and 3. 97,respectively,and the maximum equivalent viscous damping ratio is 0. 359. The drift distribution of the specimen shows the ideal inverted triangle pattern of the flexure-shear type. When the load-carrying capacity of the specimen is decreased to 85% of its ultimate strength,the inter-story drift ratio is greater than 4. 9% and the minimum connection rotation is 0. 366 rad,which all surpass the lower limit（ 1 / 30） of inter-story drift at the maximum considered earthquake level,indicating that the specimen has high collapse prevention capacity.