高耸型钢钢筋混凝土筒体结构抗震性能振动台试验研究

为了研究高耸型钢钢筋混凝土结构抗震性能,以实际高宽比13.33的高耸型钢钢筋混凝土筒体结构为试验研究对象,提出了考虑重力完全相似模型设计方法及实现策略,设计并制作了 1∶20的试验模型,对其进行自由衰减试验及不同地震波激励下的振动台试验,获得了高耸型钢钢筋混凝土外筒体结构的阻尼比,研究了不同幅值不同地震波激励下其加速度...

Shaking table test on seismic performance of towering steel-reinforced concrete tube structure

In order to study the seismic performace of towering steel-reinforced concrete tube structure, taking a model with actual aspect ratio of 13.33 as the experimental research object, the design method and implementation strategy of experimental model considering full similarity of gravity were proposed. One 1∶20 test model was designed and manufactured, and its free attenuation test and shaking table test were carried out under different seismic wave excitations to obtain the damping ratio of the towering steel-reinforced concrete tube structure and to study the distribution laws of acceleration response, displacement response, strain response and inter-story shear force under different seismic wave excitations. The test results show that the scale test model based on gravity full similarity design method and implementation strategy can reflect the performance of the prototype structure well, and the experimental results of natural vibration characteristics are basically consistent with the finite element analysis results. The interal energy-dissipation performance of towering steel-reinforced concrete tube structure is low, and the first-period damping ratio is 1.123%, which is less than the value specified in the code. When the structure is damaged during fortification earthquake and rare earthquake, the distribution of acceleration, inter-story displacement and inter-story shear force will change greatly, and the maximum value of acceleration response increases gradually from top to bottom of the structure. The distribution of inter-story displacement becomes uneven in the middle and upper part of the structure, presenting ‘wave’ shape. The inter-story shear force increases linearly from top to bottom of the structure. The towering steel-reinforced concrete tube structure presents favorable seismic performance. The steel can work together with concrete, and the difference between the strain of steel and concrete is small. The steel-reinforced concrete wall is mainly affected by the overall overturning moment. Its seismic performance can meet the seismic requirements of the Chinese Code.