摘要
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 introduction of the critical angle, design of irregular plane RC frame-shear-wall structure was achieved using the improved multimode pushover analysis method. First, the critical angle of seismic wave was determined using the wavelet transform in MATLAB. Second, based on the performance requirement from the designed structure, the multimode pushover analysis method and the capacity spectrum were used to calculate the supplement damping ratio, and the corresponding viscous damper was selected and placed properly. Finally, the seismic performance was evaluated using the torsional angle capacity method. The results indicate that the critical angle of seismic wave show significant influence on the performance of the irregular plane RC frame-shear-wall structure. Meanwhile, the structural design based on the improved multimode pushover analysis method can achieve the expected purpose. Furthermore, the method can lead to significantly reduced structural torsional displacement ratio and highly improved structural seismic performance.
作者
黄小宁
杜永峰
李慧
HUANG Xiao-ning DU Yong-feng LI Hui(Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China)
出处
《工程力学》
EI
CSCD
北大核心
2017年第3期68-75,共8页
Engineering Mechanics
基金
国家自然科学基金项目(51178211)
关键词
平面不规则RC框剪结构
减震结构
小波变换
多模态
扭转角能力法
irregular plane RC frame-shear-wall structure
structure with dampers
wavelet transform
multimode
torsional angle capacity method
