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为研究拉链柱支撑钢框架结构的抗震性能并对设计方法进行验证,完成了一个3层单跨1∶4缩尺比例的拉链柱支撑钢框架结构模型在24个地震作用工况下的模拟地震作用振动台试验。通过试验,得到了结构的动力特性、层间位移响应、加速度响应以及各结构构件的受力状态等。结果表明,8度多遇及设防烈度地震作用工况下,结构基本未进入塑性,试验模型振动时以第1阶模态振动为主。超9度罕遇地震作用工况下,底层支撑失稳明显,顶层支撑未见失稳。底层受拉支撑的最大轴拉力接近屈服轴力,受压支撑的屈曲后承载力约为支撑稳定承载力的30%,表明由支撑失稳产生的竖向不平衡力按受拉支撑的最小屈服承载力和受压支撑的最大屈曲承载力的30%计算是可行的。拉链柱主要通过受拉传递因支撑失稳产生的竖向不平衡力。因变形协调关系,被支撑梁可以承受一定的竖向不平衡力,在拉链柱未屈服的前提下,一般下层被支撑梁承受的竖向不平衡力要高于上层的。总体上,各构件的受力状态及传力路径与设计初衷基本一致,结构体系在模拟地震作用振动台试验中表现出了良好的抗震性能。
In order to study the seismic behavior of the steel frame structure with zipper column support and to validate the design method, a three-layer simulated single-span, 1: 4 scale-scale steel frame structure model with 24- Shaking table test. Through the experiment, the dynamic characteristics of the structure, the displacement response between layers, the acceleration response and the stress state of each structural member are obtained. The results show that the structure basically does not enter the plastic under the action of seismic intensity more than 8 degrees and fortification intensity, and the vibration of the experimental model is dominated by the first mode vibration. Super-9 degree rare earthquake conditions, the bottom support obvious instability, the top support no instability. The maximum axial tensile force of the bottom tensioned support is close to the yield axial force. The post-buckling bearing capacity of the compression brace is about 30% of the steady bearing capacity of the brace, indicating that the vertical unbalanced force caused by the instability of the brace depends on the minimum yielding of the brace The calculation of 30% of the maximum buckling capacity of bearing capacity and compression bearing is feasible. The zipper column transmits the vertical imbalance force caused by the instability of the support mainly through tension. Due to the coordination of deformation, the supported beam can withstand a certain amount of vertical unbalance force. Under the premise that the zipper column is not yielding, the vertical unbalance force under the lower support beam is higher than the upper one. In general, the stress state and force transmission path of each component are basically the same as original design intention, and the structural system shows good anti-seismic performance in shaking table test under simulated earthquake action.