型钢混凝土异形柱空间框架结构模型振动台试验研究  

Shaking table test on steel reinforced concrete spatial frame structure model with special-shaped columns

作　　者：薛建阳[1] 胡宗波[1,2] 刘祖强[1] XUE Jianyang HU Zongbo LIU Zuqiang(College of Civil Engineering, Xi＇an University of Architecture and Technology, Xi＇an 710055, China Department of Architectural Engineering, Logistics University of People＇ s Armed Police Force, Tianjin 300309, China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]武警后勤学院建筑工程系,天津300309

出　　处：《建筑结构学报》2017年第2期74-82,共9页Journal of Building Structures

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

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。A one-fourth scaled steel reinforced concrete frame structure model with special-shaped columns was tested on the 3D and 6-degree shaking table with three different seismic wave inputs. Dynamic characteristics such as natural frequency,vibration mode and damping ratio were assessed through white-noise scanning. Failure characteristics,acceleration,displacement response,inter-story shear force and strain response were investigated. The test analysis indicates that the natural frequency descends,the damping ratio ascends and the acceleration amplifying factor decreases gradually with the increase of seismic intensity. Structural vibration is given priority to with the first vibration mode. Under the action of strong earthquake,the deterioration of inter-story stiffness is quite rapid. The integral lateral displacement curve is S-shaped and the inter-story shear force decreases gradually along the height. The strain analysis indicates that the steel flange parallel to the main vibration direction of side column and corner column yield firstly on the first floor of side frame. Then,the plastic hinge is formed on the third floor beam end of side frame,and the seismic capacity of corner column and the beam end connected to corner column is low. The analysis of inter-story drift ratio shows that the steel reinforced concrete frame with special-shaped columns has good seismic performance. In the later elasto-plastic stage,energy consumption of model structure is improved significantly.

关 键 词：型钢混凝土 异形柱 空间框架 振动台试验 抗震性能 

分 类 号：TU398.703[建筑科学—结构工程]