建筑結(jié)構(gòu)彈塑性分析軟件應用若干問題探討
焦 柯， 吳桂廣， 賴鴻立， 趙云龍
- 摘 要
-
焦 柯， 吳桂廣， 賴鴻立， 趙云龍(廣東省建筑設(shè)計研究院，廣州510010)[摘要] 針對建筑結(jié)構(gòu)彈塑性分析軟件在抗震設(shè)計中存在的一些問題進行分析討論。比較了梁柱構(gòu)件采用纖維束單元與塑性鉸單元進行計算的差異。采用不同加載模式下靜力推覆分析結(jié)果差異較大，建議采用給定水平力加載模式計算。當結(jié)構(gòu)第一振型參與質(zhì)量大于70%，推覆分析與時程分析結(jié)果比較接近。對存在明顯軟弱層的高層結(jié)構(gòu)進行推覆分析，軟弱層的位移角結(jié)果偏大，此類結(jié)構(gòu)建議采用時程分析。時程分析中不宜通過增加峰值加速度或放大地震力方法來滿足規(guī)范選波要求，宜通過地震波修正軟件選波。分析了造成彈塑性分析模型與彈性設(shè)計模型不一致的幾個因素。[關(guān)鍵詞] 彈塑性分析軟件；推覆分析；時程分析；地震波；加載模式中圖分類號：TU973 +.2 文獻標識碼：A 文章編號：1002-848X(2012) S2-0197-05Discussion on some practical problems about elasto-plastic analysis software for building structuresJiao Ke, Wu Guiguang, Lai Hongli, Zhao Yunlong( The Arclutectural Design and Research Institute of Guangdong Province, Guangzhou 510010, China)Abstract: Some practical problems about elasto-plastic analysis software for building structures were discussed. The differences between fiber bundle model and plastic hinge model of beam element had been compared. The results of different load pattems by push-over analysis are great different, and the given horizontal force pattern is suitable. Push-over analysis should be used on building structures which first modal participation mass is more than 70% of the total mass. Story drifts of the lugh-rise structures owrung obvious weak layer by push-over analysis are bigger than story drifts by time-lustory analysis, and the later is suggested to use for that kind of structures. In time-history analysis, artificially increasing peak acceleration or the seismic force to meet the requirements of the codes are not suitable, using the corrected software of seismic waves is a better choice. The factors that give rise to differences between elasto-plastic model and elastic model were analyzed.Keywords: elasto-plastic analysis software; push-over; time history analysis; seismic waves; load pattems
