摘要
为了解决平面不对称结构基于性能的减震设计问题,提出基于多模态的耗能减震设计方法。基于多模态的设计方法将结构的性能目标用多阶模态表示。引入各阶模态等效单自由度体系的最大位移幅值之比,将结构的性能表示成关于第1阶模态等效单自由度体系的位移幅值的函数,并由结构的性能目标值确定第1阶模态等效单自由度体系的允许最大位移幅值。继而根据位移反应谱确定第1阶模态的阻尼比,确定附加阻尼比及阻尼系数。计算阻尼系数提供给各阶模态的等效阻尼比,依据阻尼比修正最大位移幅值之比和模态的相关系数,进行迭代计算直到阻尼比满足精度要求。由迭代收敛时的附加阻尼比确定阻尼系数,该阻尼系数就是结构满足性能要求需要的阻尼系数。
To realize performance-based design for the asymmetric buildings with dissipation devices, a muhimode-based design method is proposed for the structures with dampers. By introducing the maximum displacement ratio of an equivalent SDOF system for every mode, the structure performance can be represented as a function of the maximum displacement of the first mode of the SDOF system. The allowed maximum displacement of the first modal SDOF system can then be calculated from the prescribed performance objective, the damping ratio needed for the first mode can be identified by using the displacement spectrum, and the supplemental damping ratio and the damping coefficient can be determined. The equivalent damping ratios of other modes are calculated and the ratio of maximum displacement and the correlation coefficient between the modes are accordingly modified. Iteration continues until the calculated damping ratio meets the precision requirement. The damping coefficient for the structure to meet the performance objective can be calculated from the converged value of the damping ratio.
出处
《土木工程学报》
EI
CSCD
北大核心
2009年第9期1-6,共6页
China Civil Engineering Journal
关键词
耗能减震结构
性能目标
多模态
阻尼比
buildings with dampers
performance objective
muhimode
damping ratio
