基于振型的结构平面规则性界定方法

Method of defining structural plane regularity based on vibration mode

为研究结构平面规则性的界定方法,首先分析了平面规则结构的振型序列特征并验证了其稳定性。以L型结构为例,通过将规则结构的振型序列特征与L型结构的振型序列特征对比,得到了不同L型结构的平面规则性界定曲线,指出了凸出部分的横向长度与横向总长度之比、凸出部分的纵向长度与纵向总长度之比和结构高度是影响L型结构平面规则与否的重要因素,并建议平面不规则结构位移比限值取1.3。提出了基于振型的结构平面规则性界定方法,即:与平面规则结构的振型序列相比,平面不规则结构的振型序列中不利振型(扭转振型、包含扭转的耦合振型及局部振型等需考虑空间效应的振型)会提前。通过对一实际结构进行计算分析,验证了基于振型的结构平面规则性界定方法的优越性和正确性。

In order to study method of defining structural plane regularity,the characteristics of modal sequences of a planar regular structure were analyzed firstly and its stability was verified.Taking the L-shaped structure as an example,curves defined by plane regularity of different L-shaped structures were obtained through comparing characteristics of modal sequences between regular structures and L-shaped structures.Three important factors of affecting the plane regularity of L-shaped structure were pointed out that the ratio of lateral length of projecting portion to total lateral length,the ratio of the longitudinal length of projecting portion to total longitudinal length and the structural height,and it was suggested that displacement ratio of plane irregular structure should be limited to 1.3.A method for defining the plane regularity of structure based on vibration modes was proposed,and compared with the modal sequences of planar regular structure,the unfavorable vibration modes(for example,torsional mode,coupled modes including torsional modes and local modes that need to consider spatial effects) in the mode sequences of planar irregular structures were advanced.Finally,through calculation and analysis of an actual structure,advantages and reliability of the proposed method were verified.