摘要
因地震动输入方向对平面不规则结构响应的影响显著,所以本文对该类的实用多维反应谱计算方法进行了研究。首先,基于多维加速度功率谱矩阵的研究成果,引入激励输入角度和相应参数,推导了能合理考虑激励输入方向的加速度功率谱和基于平稳随机振动求解响应的计算公式。然后再引入位移谱,利用其能合理考虑激励非平稳性的特点,提出了水平双向的实用反应谱法计算公式。最后,以平面为L形的空间钢结构为例,对不同输入角度时的节点位移公式计算值与多条地震波的时程响应值进行了比较,证明该计算方法是合理的,可供结构抗震设计与分析作参考。
The influence of input angle of excitation on structural response is significant, a practi- cal response spectrum method for analyzing the behaviors of this kind of structure is studied. Firstly, based on the achievements about the multi-components accelerations power spectra ma- trix, a rational formula, considering the input angle of excitation, is deduced by using stationary random vibration principle. Secondly, a practical formula is proposed by introducing the displacement response spectrum considering the non-stationarity of excitation. Finally, the practical formula is used in a typical case： a spatial steel structure with L shape plane, and the comparison between the results from the formula and ones from time-history method with some earthquake ground motions is conducted, which proved the practical formula is reasonable and could be a ref- erence for design and analysis of structures under seismic actions.
出处
《防灾减灾工程学报》
CSCD
北大核心
2014年第3期389-394,共6页
Journal of Disaster Prevention and Mitigation Engineering
基金
浙江省自然科学基金项目(Y1100363)资助
关键词
平面不规则
激励输入方向
位移反应谱
非平稳性
L形平面
asymmetric plane
the input angle of excitation
displacement response spectrum
non-stationarity
L shape plane
