论文部分内容阅读
评估了不同支撑系统改造的抗弯钢框架的抗震性能。采用3种结构形式:中心支撑框架、防屈曲支撑框架和巨型支撑框架。设计了一横向刚度不足的9层钢框架,满足规范对高地震灾害区域结构的侧移要求。用中心支撑、防屈曲支撑和巨型支撑改造框架,进行非弹性时程分析,评估地震作用下的结构性能。以局部变形(杆件转角)和整体变形(层间及屋顶侧移)为参数,比较改造框架非弹性性能的不同。结果表明:巨型支撑框架是最有效率的支撑系统,其最大层间侧移比抗弯框架低70%,比中心支撑框架低50%。侧移的减小量与地震特性有关,尤其是频率。防屈曲支撑的抗震性能仅稍优于巨型支撑框架,但其总质量更大。巨型支撑框架的杆件和节点用钢量比中心支撑框架低20%,既降低了费用又体现了抗震优势。
The seismic behavior of the flexural steel frame modified with different support systems was evaluated. Three kinds of structure are adopted: central support frame, buckling support frame and giant support frame. A 9-story steel frame with insufficient lateral stiffness was designed to meet the requirements of lateral displacement of the regional structure with high seismic disaster. With the center support, buckling support and giant support transformation framework, the inelastic time history analysis to assess the structural performance under earthquake. The differences of the inelastic properties of the retrofit frame are compared with the parameters of local deformation (the corner of the rod) and overall deformation (interlayer and roof displacement). The results show that the giant support frame is the most efficient support system with a maximum lateral floor displacement of 70% lower than the flexural frame and 50% lower than the center support frame. The amount of lateral displacement is related to the seismic characteristics, especially the frequency. The anti-buckling brace’s seismic behavior is only slightly better than the giant brace, but its overall mass is even greater. Giant support frame members and nodes of steel than the central support frame 20% lower, both to reduce costs and embodies the seismic advantages.