芯筒刚臂结构地震倒塌试验研究

发布时间：2018-04-01 16:48

本文选题：芯筒刚臂结构　切入点：振动台试验　出处：《土木工程学报》2014年11期

【摘要】：对一个56层芯筒刚臂纯钢结构进行缩尺模型的振动台倒塌试验。试件缩尺比例为1∶40,主要构件材料根据相似关系选为紫铜。为了揭示地震波共振效应对结构的不利影响,选取天然波Chi-Chi TCU117以及基于该波根据频谱缩放方法得到的试验模型的一阶共振波作为振动台输入。试验中输入的地震波为7度小震水平。结构在天然波作用下保持完好,在一阶共振波作用下发生倾覆倒塌。根据试验数据得到了结构两种地震波作用下的惯性力,层间剪力以及倾覆弯矩包络。数据分析发现,具有共振特性的地震波作用下结构响应达规范反应谱值的10倍以上,峰值加速度仅在规范小震/中震等级时就能够导致结构倒塌。结构的倒塌模式为边柱破坏引起倾覆,与墨西哥地震中pino Suarez建筑类似。结构的伸臂使得楼层质量产生整体转动加速度,使得结构破坏位置转移到下层伸臂以上外柱受压承载力更薄弱的位置。
[Abstract]:The shaking table collapse test of a pure steel structure with 56 layers of core tube with rigid arm is carried out. The scale ratio of the specimen is 1: 40, and the main component material is selected as red copper according to the similarity relationship. In order to reveal the adverse effect of seismic wave resonance effect on the structure, The natural wave Chi-Chi TCU117 and the first order resonance wave of the experimental model based on the spectrum scaling method are selected as the input of the shaking table. The seismic wave input in the test is 7 degrees small earthquake level, and the structure remains intact under the action of the natural wave. Based on the experimental data, the inertial force, interlayer shear force and the envelope of overturning moment are obtained under the action of the first order resonance wave. Under the action of seismic wave with resonance characteristics, the response of the structure is more than 10 times that of the normal response spectrum, and the peak acceleration can lead to the collapse of the structure only when the magnitude of the normal small / medium earthquake is measured. The collapse mode of the structure is the collapse caused by the failure of the edge column. Similar to the pino Suarez building in the Mexico earthquake, the extension arm of the structure causes the overall rotational acceleration of the floor mass, and the structural failure position shifts to the position where the compressive capacity of the outer column above the lower arm is weaker.
【作者单位】：同济大学土木工程防灾国家重点实验室;同济大学土木工程学院;
【基金】：土木工程防灾国家重点实验室项目(SLDRCE09-B-07)
【分类号】：TU973.31

【参考文献】