判别结构扭转不规则的位移比计算方法探讨

对一幢高层建筑结构的计算分析表明,用CQC法计算的结构位移比有可能误判结构的扭转规则性。提出了三种计算结构位移比的补充方法,即第一振型法、弹性时程分析法和推算平面端部位移法。用推算平面端部位移法计算了一组偏心程度不同的算例的位移比,提出了与CQC法及规范位移比限值有较好线性相关性的判别扭转不规则的位移比值。

Study on Calculating Methods of Displacement Ratio Used to Judge Structural Torsion Irregularity

Analytical results of a high-rise building indicate that wrong judgement of structure regularity is possible by using displacement ratios calculated by CQC method.Three additional displacement ratio calculating methods,i.e.,the first mode method,elastic time history analysis method and calculating plane end displacement method,are suggested.The third method is used to calculate the displacement ratios of a set of building calculating examples with different degree of irregularity.Displacement ratio values used to judge the torsion irregularity of buildings are proposed and have a good linear relativity with CQC method and the displacement ratio values in current code.