巨型钢框架-拉索支撑体系的Pushover分析

THE PUSHOVER ANALYSIS OF MEGA STEEL FRAME-CABLE BRACING STRUCTURE

为研究新型结构巨型钢框架-拉索支撑体系的破坏模式及其抗震性能,分别采用倒三角形和均布荷载两种水平荷载加载方式,进行Pushover推覆分析。研究表明:在达到水平极限状态时,倒三角形加载模式比均匀分布加载模式出现破坏层数相对高一些,两种水平荷载加载方式的破坏模式基本一致。构件破坏先后顺序为柱肢间支撑、巨型梁腹杆、楼层梁、巨型梁弦杆、柱肢。拉索退出工作的时间越早,则同一层中另一侧拉索拉力增加的速度越快。8度多遇地震作用下,结构处于弹性状态;8度罕遇地震下,结构部分构件进入塑性状态;层间位移均满足抗震规范要求。

For studying failure mode and structural anti-seismic performance of the original mega steel frame-cable bracing structure, the pushover analysis was applied by two different lateral loading patterns of inverted triangle and uniform distribution in this paper. The calculation results show that failure mode is basically the same in the two lateral load patterns. The failure order of members is braces between columns, web rods of mega beam, floor beams, chord rods of mega beam, and column piers. Cable fails earlier, the tension of another cable in the same story increases faster. In 8 degree frequent earthquake, the structure is in the elastic state, and in 8 degree rare earthquake, parts of the structural members enter into plastic state. All the inter-story drifts meet the seismic requirements under the action of 8 degree frequent earthquake and rare earthquake.