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在引入最不利输入角度的基础上,运用改进的基于多模态推覆分析法对平面不规则RC框剪结构进行减震设计。首先,利用MATLAB小波变换系数法,判别地震动的最不利输入角度;然后,根据结构提出的性能目标,以多模态推覆分析的设计方法为主,结合能力谱法计算结构所需的附加阻尼比,选择相应的粘滞阻尼器,合理布置阻尼器的位置;最后,利用扭转角能力法对比分析原结构和减震结构的抗扭性能。分析结果表明:对于平面不规则RC框剪结构,地震动输入角度对结构的抗震性能有不可忽略的影响;利用改进的基于多模态推覆分析法对结构进行减震设计后可达到预先提出的性能目标,减小结构的扭转位移比,提高结构的抗震性能。
Based on the most unfavorable input angle, an improved multi-modal nappe analysis method is adopted to design the RC frame shear structure with irregular plane. First of all, the most unfavorable input angle of ground motion is discriminated by using MATLAB wavelet transform coefficient method. Then, based on the performance target proposed by the structure, the design method of multi-modal pushover analysis is mainly used, Damping ratio, select the corresponding viscous damper, reasonable arrangement of the damper position; Finally, the use of torsion angle capability method for comparative analysis of the original structure and the damping structure of the torsional resistance. The analysis results show that the input angle of ground motion can not neglect the seismic performance of the RC frame shear structure with irregular plane, and can be preliminarily proposed after the structure is mitigated by the improved multi-modal nappe analysis method Performance goals, reduce the structure of the torsional displacement ratio, improve the seismic performance of the structure.