钢筋混凝土密肋空腹框架结构地震反应分析
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摘要
借鉴巨型框架结构的抗震作用机制,提出了内嵌混凝土框格单元的密肋空腹框架结构体系。运用有限元程序对密肋空腹框架结构进行了地震反应分析,研究结构的主要动力特性随框格单元密度变化的规律,并与普通框架结构计算结果进行了比较。分析表明:密肋空腹框格单元可以有效提高框架结构的抗侧刚度和抗扭刚度,满足抗震规范对最大层间位移限值的要求;框格单元密度达到一定程度后结构侧移曲线呈现类似框剪结构的弯剪型特征,结构整体具有"内框格单元-外框架"的分步延性破坏机制,增加了强震下框架结构的安全裕度。
Based on anti-seismic mechenism of the mega-frame structure, multi-rib open-web frame structure system with embedded concrete frame units is put forward.Though analyzing the horizontal earthquake action of multi-rib open-web frame structure by ETABS program,it is calculated and compared the variation rules of several major structural dynamic properties according to the density of frame grid element.The result shows that multi-rib open-web frame elements improve lateral stiffness of frame,and it can solve the torsion problem,which caused by short of lateral stiffness of ordinary frame or elements' arrangement.Pushover analysis shows multi-rib open-web frame structure obeys the ductility failure mechanism: first frame unit,then outer frame,and the safety margin of structure has been raised under strong earthquake.
Based on anti-seismic mechenism of the mega-frame structure, multi-rib open-web frame structure system with embedded concrete frame units is put forward.Though analyzing the horizontal earthquake action of multi-rib open-web frame structure by ETABS program,it is calculated and compared the variation rules of several major structural dynamic properties according to the density of frame grid element.The result shows that multi-rib open-web frame elements improve lateral stiffness of frame,and it can solve the torsion problem,which caused by short of lateral stiffness of ordinary frame or elements' arrangement.Pushover analysis shows multi-rib open-web frame structure obeys the ductility failure mechanism: first frame unit,then outer frame,and the safety margin of structure has been raised under strong earthquake.
引文
[1]曾凡生,王红群,杨永哲.钢筋混凝土框-撑结构在多层建筑设计中的探讨[J].建筑结构,2007,37(10):24-26.
[2]陈新孝,牛获涛,石建光,等.偏心支撑钢筋混凝土框架的试验研究与极限分析[J].工业建筑,2003,33(3):35-38.
[3]JGJ 3-2002高层混凝土结构技术规程[S].
[4]张宇峰,左江.巨型框架结构的抗震性能和振动台试验研究[J].建筑结构学报,2001,22(3):2-8.
[5]段红霞,李正良.RC巨型框架结构抗震能力设计措施的探讨[J].工业建筑,2006,36(1):22-26.
[6]汪大绥,贺军利,张凤新.静力弹塑性分析(Pushover Analysis)的基本原理和计算实例[J].世界地震工程,2004,20(1):45-53.
[2]陈新孝,牛获涛,石建光,等.偏心支撑钢筋混凝土框架的试验研究与极限分析[J].工业建筑,2003,33(3):35-38.
[3]JGJ 3-2002高层混凝土结构技术规程[S].
[4]张宇峰,左江.巨型框架结构的抗震性能和振动台试验研究[J].建筑结构学报,2001,22(3):2-8.
[5]段红霞,李正良.RC巨型框架结构抗震能力设计措施的探讨[J].工业建筑,2006,36(1):22-26.
[6]汪大绥,贺军利,张凤新.静力弹塑性分析(Pushover Analysis)的基本原理和计算实例[J].世界地震工程,2004,20(1):45-53.
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