摘要
结合BRB的工作原理,推导了BRB的等效刚度,并采用Perform-3D软件对一幢14层普通钢筋混凝土框架结构及其用BRB加固后的抗震性能进行了非线性对比分析。分析选取了7条涉及50年设计基准期超越概率10%和50年设计基准期超越概率2%的地震波,加速度调整系数根据FEMA356规范选取。通过分析研究了BRB的耗能能力及不同楼层中BRB的轴向变形能力,并比较了两种结构的层间位移角值、楼层剪力、构件屈服情况等。分析结果表明,防屈曲支撑(BucklingRestrained Brace,简称BRB)能提高结构的刚度,具有良好的滞回性能,可以有效地耗散地震能量,能够很好地改善结构的抗震性能及工作性能。
Based on working principle of BRB, the equivalent stiffness of BRB is derived. With Perfom-3D software nonlinear analysis on a 14-story reinforced concrete frame and one same structure retrofitted by using BRB have been carried out. To perform the nonlinear time history verification analyses, a set of seven seismic acceleration waves are required to produce strong ground shaking at the building site,corresponding to 10% and 2% exceedance probability in 50 years respectively. The acceleration modification factor is chosen based on American code FEM356. From analysis results, the energy dissipation capability and axial deformation of BRB are studied, and the drift ratio, story shear force, yielding elements of existing structure with retrofitted ones are compared. Buckling Restrained Brace （BRB） has high hysteresis performance, can enhance the stiffness of the structure and providing effective seismic energy dissipation. BRB can also promote seismic performance and easy of maintenance for retrofit structures.
出处
《工程抗震与加固改造》
北大核心
2013年第1期23-29,共7页
Earthquake Resistant Engineering and Retrofitting
基金
建设部2008年科学技术项目研究开发项目资助(2008-k2-17)
