多层钢筋混凝土框架结构抗地震倒塌研究进展

Research progress of seismic collapse resistance of multi-story RC frame structures

多层钢筋混凝土(RC)框架结构占我国建筑总量的30%以上.传统意义上普遍认为其具有较好的抗震性能,但近年来发生的破坏性地震中,极震区RC框架结构大量倒塌,其倒塌率甚至超过了砖混结构,造成了大量人员伤亡和财产损失.这说明RC框架结构在大震作用下抗倒塌冗余度不足.针对多层RC框架结构的地震倒塌破坏问题,国内外学者进行了诸多研究.从结构地震倒塌机理和抗地震倒塌措施两方面对多层RC框架结构抗地震倒塌问题的研究现状进行了综述和讨论.

Multi-story reinforced concrete（RC）frame structures contribute more than 30% of the total buildings in China.And it is traditionally supposed to have satisfactory seismic performance.However,a large number of RC frame structures collapsed in the epicenter of the past mega-earthquakes.The collapse ratio of RC frames is even higher than that of masonry structures,which caused grave losses of life and property.It demonstrates that the anti-collapse redundancy of RC frame structures is still insufficient under the mega-earthquakes.Much study on the seismic collapse resistance problems of RC frames has been done at home and abroad.The research progress of seismic collapse resistance problems of multi-story RC frame structures is summarized and discussed from the aspects：seismic collapse mechanism and anti-collapse measures.