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为研究拉链柱支撑钢框架结构在水平荷载作用下的承载能力、抗侧刚度、破坏模式以及构件的传力模式等,对一个3层单跨1∶2.6缩尺比例的拉链柱支撑钢框架进行了静力推覆试验及数值模拟。结果表明:在对应8度多遇及设防烈度地震作用工况的水平侧移下,结构基本处于弹性工作状态,构件未出现明显失稳现象。在对应8度罕遇地震作用工况的水平侧移下,由于支撑失稳导致结构抗侧刚度明显降低,但结构的承载力并无明显下降,随着加载的进一步进行,因支撑失稳产生的竖向不平衡力主要由拉链柱承担,且该不平衡力由此逐层向上传递,导致顶层支撑的轴压力逐渐增加;当反向卸载时,拉链柱构件承担部分压力,但并未失稳。总体上,结构各构件的受力状态及传力过程与设计目标基本一致,结构在静力推覆试验中表现出良好的受力性能。
In order to study the load-bearing capacity, lateral stiffness, failure modes, and force transfer modes of the zipper column-supported steel frame structure under horizontal loads, a 3-tier single-span zipper column supporting steel frame with a scale ratio of 1:2.6 was tested. Static push test and numerical simulation. The results show that the structure is basically in the elastic working state and the component does not appear obvious destabilizing phenomenon under the horizontal side shift corresponding to the conditions of 8 degree occurrence and fortification intensity earthquake action. Under the lateral displacement of the 8-degree rare-earthquake action condition, the lateral stiffness of the structure was significantly reduced due to the support instability. However, the bearing capacity of the structure did not decrease significantly. As the loading progressed further, the support instability resulted. The vertical unbalance force is mainly borne by the zipper column, and the unbalanced force is thus transmitted layer by layer upwards, resulting in a gradual increase in the axial pressure of the top layer support; when the reverse unloading, the zipper column component bears part of the pressure but does not lose stable. In general, the stress state and force transmission process of each component of the structure are basically consistent with the design goals, and the structure shows good stress performance in the static pushover test.