基于传递函数法的大跨建筑非结构构件动力性能研究

发布时间：2018-06-12 16:08

本文选题：四边简支网架结构 + 单点连接　；参考：《土木工程学报》2014年S2期

【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%。
[Abstract]:Aiming at the case of single point connection and single degree of freedom non-structural members of four-side simply supported space truss structure, the frequency domain displacement formula of unstructured components and the frequency domain displacement formula of any point of grid truss are derived by using the transfer function method. Furthermore, the frequency-domain formula of the connection force between the main and auxiliary structures is obtained. Secondly, the influence of the frequency ratio and mass ratio of the main structure on the frequency domain displacement response and the internal force of the grid member is studied. It is concluded that the natural frequency of the grid structure can be changed effectively by the frequency tuning effect. In order to avoid the outstanding period of the site, the internal force of the truss structure is weakened and the displacement of the main structure is reduced through the relative movement of the non-structural members and the latticed structure. By changing the frequency ratio and mass ratio of the main structure, it can be seen that when the frequency ratio is about 1, the displacement of the main structure can be reduced to 40%, and when the frequency ratio of the main structure deviates from 1, the mass ratio of the main structure decreases. When the frequency ratio is 0.7 ~ 0.8 or 1.1 ~ (1.2), the displacement of the main structure decreases by 10 ~ 20 when the mass ratio is 0.01 ~ 0.02.
【作者单位】：天津大学;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家自然科学基金(51308386)
【分类号】：TU356;TU311.3

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