摘要
针对四边简支网架结构单点连接单自由度非结构构件的情况,利用传递函数法推导出非结构构件频域位移公式以及网架任一点频域位移公式,并进一步得到主附结构之间连接作用力的频域公式。其次研究主附结构频率比和质量比等参数对耦合结构频域位移响应和网架杆件内力的影响,分析得出通过频率调谐作用,非结构构件可以有效地改变网架结构的自振频率,从而避开场地的卓越周期,同时通过非结构构件与网架结构的相对运动,减弱网架结构的内力,减小主体结构位移。改变主附结构的频率比和质量比分析可知,当频率比在1左右时,主体结构位移减小幅度一般可达40%;当主附结构的频率比偏离1时,随着主附结构质量比的减小,主体结构的位移减小幅度降低;当频率比为0.7~0.8或1.1~1.2时,质量比在0.01~0.02内主体结构位移减小幅度为10%~20%。
In terms of four edges simply supported grid structure with a single-point-connection and single-degree non-structural component, displacement in the frequency domain of non-structural components and that of any point in the grid structure by the method of transfer function were derived. The connection force between the grid structure and its attached parts in frequency domain was further acquired. Considering some parameters including the frequency ratio and mass ratio of the primary and attached structure, the displacement of the coupling structure and the member internal force were studied. The non-structural components could effectively change the natural frequencies of the grid structure through frequency tuning effect, making the primary structure avoid the site predominant period. Meanwhile, the relative motion of non-structural components and grid structure could decrease the internal force and displacement. By changing the frequency ratio and mass ratio of the primary structure and its attached parts, the primary structure displacement is decreased by 40% when the frequency ratio reaches 1. The decline of the primary structure displacement reduces with the decrease of the mass ratio when the frequency ratio deviates from 1. When the frequency ratio is 0.7~0.8 or 1.1~1.2 and mass ratio is in the range of 0.01~0.02, the primary structure displacement decreases by 10%~20%.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第S2期79-84,共6页
China Civil Engineering Journal
基金
国家自然科学基金(51308386)
关键词
四边简支网架结构
单点连接
非结构构件
传递函数法
ANSYS谐分析
four edges simply supported grid structure
single-point-connection
non-structural components
transfer function method
ANSYS harmonic analysis
