型钢混凝土异形柱空间框架结构模型振动台试验研究

发布时间：2018-01-11 17:44

本文关键词：型钢混凝土异形柱空间框架结构模型振动台试验研究　出处：《建筑结构学报》2017年02期 　论文类型：期刊论文

【摘要】：采用三维6自由度模拟地震振动台对1∶4缩尺的型钢混凝土异形柱空间框架结构模型进行了三种地震波输入试验。通过白噪声扫描得到了该模型结构的自振频率、振型、阻尼比等动力特性,研究了模型的破坏特征、加速度、位移反应、楼层剪力和应变反应。试验结果表明:随着地震峰值加速度的增加,框架模型的自振频率下降,阻尼比增大,加速度放大系数逐渐减小,结构振动以第1阶振型为主;在罕遇地震作用下,层间侧向刚度退化较快,结构整体侧向位移曲线呈S形,楼层剪力沿楼层高度方向呈递减趋势;在弹塑性工作阶段,第1层边框架角柱和边柱平行于主振方向一侧的型钢翼缘首先屈服,第3层边框架梁端随后出现塑性铰。由应变分析可知,边框架角柱及其梁端为抗震薄弱区域;型钢混凝土异形柱框架结构抗震性能良好,弹塑性工作阶段后期,模型结构耗能显著提高。
[Abstract]:Using 3-D 6-DOF simulated seismic shaking table pair 1:. 4. Three kinds of seismic wave input tests have been carried out for the spatial frame structure model of special-shaped steel reinforced concrete columns with scale. The natural vibration frequency of the model structure has been obtained by scanning the white noise. The failure characteristics, acceleration, displacement response, floor shear and strain response of the model are studied in this paper. The experimental results show that with the increase of the peak acceleration of the earthquake, the dynamic characteristics of the model, such as vibration mode and damping ratio, are studied. The natural vibration frequency of the frame model decreases, the damping ratio increases, and the acceleration magnification coefficient decreases gradually. Under the action of rare earthquake, the lateral stiffness of the floor degenerates rapidly, the overall lateral displacement curve of the structure is S-shaped, and the shear force of the floor decreases along the direction of the height of the floor. At the stage of elastic-plastic work, the flange of the first layer frame corner column and the edge column parallel to the side of the main vibration direction first yield, and then the plastic hinge appears at the end of the third layer edge frame beam, which can be seen from the strain analysis. The edge frame corner column and its beam end are seismic weak area; The steel reinforced concrete special-shaped column frame structure has good seismic performance, and the energy consumption of the model structure increases significantly in the later stage of elastic-plastic work.
【作者单位】：西安建筑科技大学土木工程学院;武警后勤学院建筑工程系;
【基金】：国家自然科学基金项目(51308444) 陕西省自然科学基础研究基金项目(2014JQ7288) 西安建筑科技大学创新团队项目
【分类号】：TU398.9
【正文快照】： 0引言由于异形柱结构建筑功能好,实用性强,国内外学者对该类结构进行了大量研究,Marin[1]、Rammamurthy等[2]、Cheng等[3-4]对钢筋混凝土异形柱的力学性能及设计方法进行了研究。Tokgoz等[5]对L形截面型钢混凝土异形柱进行了偏心受压试验,分析了柱长细比的影响。康谷贻等[6-7]

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