高层结构扭转周期比限值合理性研究
首发时间:2017-09-26
摘要:以单向偏心结构为研究对象,推导出扭转周期比的理论表达式,得出其影响因素。考虑双向地震作用,计入强轴方向抗侧刚度的影响,讨论了不同基本周期的情况,进而推导出相对扭转效应和周期比的关系,并以此为基础指出现行设计规范中扭转周期比限值的不合理性。研究结果表明:对于第一振型以平动为主的强轴偏心结构,扭转周期比随着偏心距增大而减小;相对扭转效应峰值对应的扭转周期比值随两主轴的刚度比而变化,难以通过限制周期比使结构避开相对扭转效应峰值;对于长周期结构,即使扭转周期比较小,结构的扭转响应也可能较大。
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Study on Rationality of Limitation Value of Torsional Period Ratio for tall building
Abstract:Taken structure with one-way eccentricity as object of study, theoretical expression of torsional period ratio was derived and influencial factors were obtained. The relationships between relative torsional effect and torsional period ratio of structures in different basic vibration periods are discussed, considering the effects of bi-directional seismic actions and the influence of the lateral stiffness of the structure in strong axis direction.On the basis of above analysis, the existing problems of torsional period ratio are pointed out. The results indicatethat for the eccentric structures in major axis whose first mode of vibration is mainly translational motion, torsional period ratio decreases as eccentricity increases. As the corresponding torsional period ratio of the peak of relative torsion effect changes with the ratio of stiffness in two principle axises, it may be difficult to avoid the existing of the peak of relative torsion effect by limiting the torsional period ratio. For long-period structures, even if the torsional period ratio is relatively small, the torsional response of structure may be obvious.
Keywords: structural engineering, torsional period ratio, torsion effect, structure seismic design
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