多层住宅新型复合结构的Pushover分析及支撑优化

The Pushover analysis and optimization of compound structure for new residence

通过对柔性梁柱加“人字”支撑的新型住宅复合结构的静力弹塑性(Pushovei)分析,进行了抗震性能评 估,并优化了结构构件截面．采用250mm×250mm的梁柱截面、120mm×120mm的支撑截面及正常配筋所 形成的复合结构,满足按9度抗震设防(多遇地震)的抗震能力和延性要求以及8度罕遇地震的抗倒塌验算． 其耗能机制为“混合机制”,塑性铰出现的位置及顺序为:支撑、梁端、柱下端、柱上端,因此满足“强柱、中 梁、弱支撑”多道抗震防线的抗震要求．在柱截面不改变的情况下,薄弱层出现在底层,最大层间位移满足 罕遇地震作用下结构薄弱层弹塑性层间位移的要求．计算分析得出合理的支撑与柱的抗侧刚度比在4-10 之间;最后优化了支撑截面．

Based on Pushover analysis, the new compound structure would be estimated for seismic fortification properties and optimized on members' sections. The compound structure that beam and column sections are 250 mm × 250 mm and braces section is 120 mm × 120 mm with normal steel ratio would satisfy seismic and ductile requirements of 9 seismic fortification intensity and anti - collapse of 8 rare earthquake . The energy dissipation mechanism of the structure is belong to ' mixed mechanism' . Because the positions and orders of plastic hinges are braces, and then beams ends, at last columns ends, the seismic fortification requirements are attained to 'stronger columns, medium beams, and week braces' . The weakest position of the structure is first floor, but it satisfies requirement of displacement between floors. It is reasonable that the ratio of braces and columns is between 4 - 10. At last, the structural sections are optimized.