组合工字钢框架-K型支撑结构振动台试验研究
Research on shaking table test of composited I-beam frame-K bracing structure
孟蕾 1任小强 2王森林 2石鑫朔 3康子恒4
作者信息
- 1. 河北农业大学土木工程系,保定 071001
- 2. 河北农业大学土木工程系,保定 071001;河北农业大学工程结构实验室,保定 071001
- 3. 河北农业大学工程结构实验室,保定 071001
- 4. 河北敬业建筑设计有限公司,石家庄 050000
- 折叠
摘要
为探究组合工字钢框架结构的抗震性能,在其平面内局部布置K型支撑,并对模型进行振动台试验.试验设计了一榀两层单跨的 1/2 比例的缩尺框架模型,选取El Centro波、卧龙波和江油波三条地震波作为单向激励输入,实施测量并分析了结构的动力特性、加速度、位移和应变.试验结果表明:当地震峰值加速度以 0.1g～0.62g逐级增加时,结构的自振频率和刚度略有下降,刚度变小,阻尼比略增大;结构动力放大系数先增大,后因结构损伤累积又逐渐减小;位移和应变逐渐增大;7.5 度设防地震作用下,结构最大层间位移角为 1/952,9 度罕遇地震动用下,结构最大层间位移角为 1/211;结构应变曲线呈线性变化,框架梁、柱及支撑构件未见屈曲,试件始终处于弹性状态,说明该结构的抗震耗能效果良好,符合高烈度地区抗震设防要求.
Abstract
In order to investigate the seismic performance of the composite I-steel frame structure,K-bracing shaking table test was carried out on the model.A 1/2 scale frame model with two stories and a single span was designed.Three seismic waves including El Centro wave,Wolong wave and Jiangyou wave were selected as unidirectional excitation inputs,the dynamic characteristics,acceleration response,displacement response and strain response of the structure were measured and analyzed.The test results show that when the peak acceleration of earthquake increases step by step from 0.1g to 0.62g,the natural frequency and stiffness of the frame structure decrease slightly,the structural stiffness decreases,the damping ratio increases slightly.The structural dynamic amplification coefficient first increases,then gradually decreases due to the accumulation of structural damage.Under a seismic fortification of 7.5 degrees,the maximum story drift angle of the structure is 1/952,and under a rare earthquake of 9 degrees,the maximum story drift angle of the structure is 1/211.The structural strain curve changes linearly,and there is no buckling observed in the frame beams,columns and supporting components.The specimens remain in an elastic state,indicating that the seismic energy dissipation effect of the structure is good and meets the seismic fortification requirements of high-intensity areas.
关键词
组合工字钢/钢框架/振动台试验/抗震性能/动力响应Key words
composite I-beam/steel frame/shaking table test/seismic performance/dynamic characteristic引用本文复制引用
出版年
2024
NETL
NSTL
万方数据