摘要
连体高层建筑具有多模态参与振动的特点,其风致响应往往需采用风洞试验风荷载时程进行时程分析,带来大量人力及计算资源的消耗。采用风荷载谱等效带宽内的平均值来代替共振频率处的值来计算共振响应,提出了基于风洞试验风荷载谱的快速计算连体高层建筑风致响应方法,可考虑多模态参振,计算效率显著提高。对某实际连体高层建筑开展风洞试验,分析了其风荷载特征及风荷载谱的相干函数,得到的结果高于荷载规范。最后利用所提出的方法进行了风致响应分析,并研究了连体高层建筑的各模态对共振响应分量的贡献。分析表明,基于风洞试验风荷载谱进行快速计算获得的结果与采用风洞试验风荷载时程进行时域分析所获得的结果一致,验证了该方法的可靠性。该连体高层建筑在侧向风下,下游塔楼会受到波动较大的横风向风荷载并相应产生较大的响应。对于该连体高层建筑,选取前3阶模态可获得较为准确的结果。
Connected high-rise buildings have the feature of multimodal participation in vibration,and their wind-induced response often requires using wind tunnel tests to measure wind load time histories for time history analysis,which consumes a lot of manpower and computational resources.Here,a fast method for calculating wind-induced response of connected high-rise buildings was proposed with wind load spectra based on wind tunnel tests,which could use the average value within the equivalent bandwidth of wind load spectra instead of the value at resonance frequency to calculate resonance response,multi-mode participating vibration could be considered,and the calculation efficiency was significantly improved.Wind tunnel tests were conducted for an actual connected high-rise building to analyze its wind load characteristics and coherence function of wind load spectrum,and the results obtained were higher than the load specification.Finally,the proposed method was used for wind-induced response analysis,and contributions of various modes of connected high-rise building to its resonance response components were studied.The analysis showed that the results obtained using the rapid calculation with wind tunnel tests-based wind load spectra are consistent with those obtained using time-domain analysis with wind tunnel tests-based wind load time histories to verify the reliability of this method;if the connected high-rise building is under lateral wind,its downstream tower building can undergo more largely fluctuating crosswind load to cause its larger response;for this connected high-rise building,choosing the first 3 modes can obtain more correct results.
作者
陈哲昊
张泽钦
陈勇
苏凌峰
赵辉
CHEN Zhehao;ZHANG Zeqin;CHEN Yong;SU Lingfeng;ZHAO Hui(College of Architectural Engineering,Zhejiang University,Hangzhou 310058,China;Zhejiang Provincial Building Design and Research Institute,Hangzhou 310005,China)
出处
《振动与冲击》
北大核心
2025年第17期215-225,235,共12页
Journal of Vibration and Shock
基金
国家自然科学基金(51878607,51838012)。
关键词
连体高层建筑
风致响应
多模态
背景与共振响应
风洞试验
connected high-rise buildings
wind-induced response
multi-mode
background and resonance response
wind tunnel test
