【摘要】 鉴于带普通加强层的框架核心筒结构在加强层附近刚度突变和应力集中现象严重,罕遇地震下难以形成合理的破坏机制,本文借鉴偏心支撑钢框架剪切屈服耗能梁段,提出采用剪切屈服型伸臂加强层。通过对比带剪切屈服型伸臂加强层与带普通加强层的框架核心筒结构在风载以及多遇地震下弹性动力响应,以及其在罕遇地震下塑性铰和剪力墙裂缝分布情况,得到其在弹性阶段与带普通加强层结构抗侧刚度接近的情况下,在弹塑性阶段的位移控制能力优于带普通加强层结构,且破坏机制合理,有效减少了剪力墙裂缝,并保护了框架柱使其不出现破坏。更多还原

【Abstract】 A new concept of shear-yielding-outrigger strengthened storey is proposed in this paper.By employing active link of eccentrically braced frame,the proposed strengthened storey intends to alleviate the abrupt changes in stiffness and stress concentration as well as to improve failure mechanism under major earthquake of ordinary frame-core tube-outrigger structure.Elastic dynamic response with respect to frame-core tube structure with shear-yielding and ordinary outrigger strengthened storey under wind load and frequent earthquake are studied.That is followed by the investigation of the distribution of plastic hinges and cracks on the shear wall under major earthquake.Conclusion is drawn that frame-core tube structure with shear-yielding-outrigger strengthened storey is superior to ordinary outrigger strengthened storey in drift control and failure mechanism under elasto-plastic stage,in spite of having the contiguous lateral stiffness under elastic stage.更多还原