摘要
采用非线性有限元法建立了连梁精细弹塑性模型,通过滞回性能分析与能量等效方法得到用于连梁弹塑性分析的弯矩-转角骨架曲线。对剪力墙结构分别进行小震和中震作用下的弹塑性时程分析,研究连梁刚度退化与结构耗能情况。根据连梁的弹塑性响应,确定连梁的等效刚度折减系数。考察剪力墙结构在地震作用下的能量耗散情况以及连梁与墙肢塑性的发展特点,将结构的塑性耗能转化为附加阻尼能。采用前述所得连梁刚度折减系数与等效阻尼比对剪力墙结构进行反应谱法计算,并与弹塑性时程法进行对比,验证了本文方法的合理性。
A precise elasto-plastic model of the coupling beam in shear wall structures was established by nonlinear finite element method. By analyzing its hysteresis performance and using the energy equivalence method, the simplified moment-rotation skeleton curve of the coupling beam was derived for elasto-plastic analysis. The stiffness degradation and the structural energy dissipation of coupling beams were studied through elasto-plastic time-history analysis on shear wall structure under frequent earthquake and fortification earthquake respectively and the equivalent stiffness reduction factor of the coupling beams was determined according to elasto-plastic responses of coupling beams. The energy dissipation behavior of the shear wall structure under the earthquake action was investigated as well as the plasticity development characteristics in the coupling beams and wall piers. And the plastic energy dissipation was converted into additional damping energy. By adopting the proposed stiffness reduction factor of coupling beam and equivalent structural damping ratio,the results of shear wall structure calculated by response spectrum method were compared with those of elasto-plastic time-history method to verify the rationality of proposed method.
出处
《建筑结构》
CSCD
北大核心
2015年第23期15-20,33,共7页
Building Structure
关键词
连梁
滞回曲线
刚度折减系数
等效阻尼比
反应谱法
时程法
coupling beam
hysteresis curve
stiffness reduction factor
equivalent damping ratio
response spectrum method
time-history method
