高层钢结构基于均匀损伤设计的整体抗震能力提高方法

本文主要研究如何通过合理设计来提高高层钢结构的整体抗震能力。首先,给出了高层钢结构的非线性计算模型;其次,建立了高层钢结构在强地震动作用下的倒塌失效模式的极限状态判别准则;然后,通过模态pushover分析,研究了高层钢结构在水平地震作用下的损伤规律;最后,重点研究了高层钢结构的整体抗震能力的提高方法,提出了均匀损伤的设计方法,该方法通过消除结构的薄弱层,来达到提高高层钢结构的整体抗震能力的目的。通过对两栋20层的高层钢框架结构进行极限时程分析和极限pushover分析,验证了文中提出的均匀损伤的设计方法的可行性。本文的工作可为高层钢结构的抗地震倒塌设计提供参考依据。

A method for increasing the integral seismic capacity of tall steel buildings based on uniform-damage seismic design

The paper mainly study how to increase the integral seismic capacity of the tall steel buildings by reasonable design.Firstly,the structural nonlinear calculation model is given.Secondly,the criterion of collapse failure modes of tall steel buildings under strong earthquake motion is established.Thirdly,by modal pushover analysis,damage law of tall steel buildings under horizongtal earthquake action is studied.Finally,the method for increasing the integral seismic capacity of tall steel buildings is studied mainly.The uniform-damage design method is proposed to increase the integral seismic capacity of tall steel buildings by eliminating the structural weakest stories.Two 20-story steel frame structures are designed on the basis of conventional philosophy and the uniform damage design method are used for limit state time history analysis and limit state pushover analysis to verify the proposed method in the paper.The results demonstrate that the uniform-damage design method is effective for increasing the integral seismic capacity.The research in the paper will give a reference to the design for preventing the seismic collapse of tall steel buildings.