拉链柱支撑钢框架结构振动台试验研究

发布时间：2018-11-20 20:40

【摘要】：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。
[Abstract]:In order to study the seismic behavior of braced steel frame structure with zipper column and verify the design method, The shaking table tests of a 3-story single-span 1:4 scale steel frame model with zipper braced columns under 24 earthquake conditions are completed. The dynamic characteristics of the structure, the response of interstory displacement, the acceleration response and the stress state of each structural member are obtained through the test. The results show that under the condition of frequent occurrences of 8 degrees and earthquake intensity, the structure is basically not plastic, and the vibration of the test model is dominated by the first mode vibration. Under the action of earthquake exceedingly, the underlayer bracing is unstable obviously, but the top brace is not unstable. The maximum axial tensile force of the bottom tensile support is close to the yield axial force, and the post-buckling bearing capacity of the compression bracing is about 30% of the stable bearing capacity of the bracing. It is shown that the vertical unbalance force caused by the instability of the braces is feasible according to the minimum yield bearing capacity of the tensile braces and the maximum buckling capacity of the compressive braces. The vertical unbalance force caused by the instability of the braces is mainly transmitted by the zipper column. Because of the compatibility of deformation, the braced beam can bear a certain vertical unbalance force. Under the condition that the zipper column does not yield, the vertical unbalance force of the lower braced beam is higher than that of the upper one. On the whole, the stress state and load transfer path of each component are basically consistent with the original intention of design, and the structural system shows good seismic performance in the shaking table test of simulating earthquake action.
【作者单位】：河北科技大学建筑工程学院;哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金项目(51208169,51178145) 河北省自然科学基金项目(E2014208115)
【分类号】：TU391

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