防屈曲支撑在高层混凝土框架结构抗震加固中的应用

Application of Buckling Restrained Braces in Seismic Retrofitting of High-Rise Concrete Frames

某十层的纯框架结构建筑检测结果表明,其弹性层间变形和弹塑性层间变形均不满足现行规范要求。采用防屈曲支撑对该结构进行了抗震加固设计,并基于SATWE软件分析了其小震下的结构性能。利用SAP2000软件,基于Pushover分析方法进行了抗震性能分析。由分析结果得知,防屈曲支撑增加了结构的抗侧刚度,增强了结构延性,改善了原结构薄弱层的抗震承载力。经防屈曲支撑加固后的结构,其变形特性仍与原框架结构类似。对实际工程所采用的防屈曲支撑进行了抗震性能抽检试验,结果表明,构件力学性能与设计数据吻合良好。防屈曲支撑技术用于高层框架结构的抗震加固具有良好的技术优势。

Based on a seismic evaluation,aseismic capacity of original ten-story concrete frame structure cannot satisfy the design standard requirements. The elastic drift and elasto-plastic drift are too large. In this paper,a concrete frame structure is strengthened by buckling restrained brace. The elastic behavior is evaluated using SATWE software. Based on pushover methods, the elasto-plastie seismic behavior is analyzed using SAP2000 software. The results show the buckling restrained brace enhances horizontal stiffness,overall plastic behavior and aseismic capacity of weak floors. The deformation behavior of strengthened structure is similar to the original structure. A full scale seismic test on buckling restrained brace is also conducted. The test results show a good agreement between experimental and numeric analysis. Based on the analysis and test results, buckling restrained brace can be used for structural strengthening.