| No matter it is framework story steel structure or underframe masonry mixed structure,which makes it possible to build multi-functional housings.Although there are numerous advantages in utility,they are characterized with “flexible upper stories and rigid bottom” and “rigid upper stories and flexible bottom”.The lateral stiffness of irregular system,whose quake-proof performance research is an essential and complicated issue,is able to cause the buildings breakdown under earthquake.The mechanical properties and quake-proof performance of typical irregular structures under earthquake are both taken into consideration.Then reinforcement study utilizing buckling supports is conducted based above analysis.What is explored is the reinforcement effects of Buckling Restrained Braces in the system with irregular lateral stiffness.The main work is here:(1)On the whole,the background and significance of the project are presented.This paper introduces the characteristics of the structure with “flexible upper stories and rigid bottom”and “rigid upper stories and flexible bottom”,and the research progress of the Buckling Restrained Braces and the practical application in engineering are well concluded.(2)PKPM structural software is applied in the analysis of framework story steel structure and underframe masonry mixed structure.It is aimed to analyze the mechanical characteristics,the weak positions,the quake-proof performance and damage causes of the irregular system.According to above study,a variety of reinforcement schemes are proposed,and a more reasonable reinforcement scheme is established.(3)Based on the actual“flexible upper stories and rigid bottom” project,the difference between the normal support and the buckling support is assessed between the static checking and the reinforcement effect.(4)With the help of MIDAS.Gen,the reinforcement design scheme of“flexible upper stories and rigid bottom” is analyzed by the response spectrum analysis,time history analysis and static elastic-plastic analysis,and the feasibility and applicabilityof reinforcement design scheme with the PKPM is verified.(5)Based on the above study,PKPM structural software is applied to analyze the frame structure and find a reinforcement plan.It is evidenced that the quake-proof performance of the structures with “flexible upper stories and rigid bottom”and “rigid upper stories and flexible bottom”is poor.Under the earthquake,the appearance of the weak layer is far from meet the requirements of quake-proof measures.The quake-proof performance of the structure is improved with the application of anti buckling support,which has a good energy dissipation effect in rare earthquakes.As a result,the overall quake-proof performance of the irregular structure is improved a lot. |
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