【摘要】 单跨框架结构的减震加固技术对于提高原框架结构的抗震性能、减小加固工程量和降低施工复杂性具有重要意义。文章通过设置防屈曲支撑(BRB)使单跨结构改变为框架—耗能支撑减震结构,从而减小原框架承担的地震效应的研究,阐明了单跨框架结构减震加固的基本原理,提出了耗能减震加固设计的准则,并对减震加固的工程实例进行了分析。结果表明:减震加固后,小震作用下的层间位移和由框架柱承担的地震剪力为加固前的30%~40%,罕遇地震作用下为25%~45%;BRB率先进入塑性变形,是整个结构的第一道地震防线;单跨框架结构采用BRB做减震加固,可有效提高结构的抗震性能。更多还原

【Abstract】 Energy dissipation technology in seismic strengthening of single-span frame structures has important implications for improving their seismic performance and reducing the quantities and the complexity of construction. Being installed some Buckling Restrained Braces( BRB),a single-span frame structure could be changed to a frame-energy dissipation brace structure,and the seismic effects carried by frame were reduced obviously. Based on such a research,this paper presented the basic principle and design guidelines for energy dissipation strengthening,and analyzed an example. The results show that,after strengthening,the inter-story shear forces carried by columns and the interstory drifts under frequent earthquakes are reduced to less than 40%,whereas those under severe earthquakes are reduced to less than 45%; BRB takes a lead in entering the plastic deformation and plays a roll of the first seismic line; Strengthened with BRB,the seismic performance of the singlespan frame structure is effectively improved.更多还原