【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。更多还原

【Abstract】 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.更多还原