实际和模态加速度约束对高层建筑结构抗风优化设计影响的比较研究  

The study on the influence of actual and modal acceleration constraints on wind optimization design of high-rise buildings

作　　者：杨雷 徐安[1] 皇甫尚乾 YANG Lei,XU An, HUANGFU Shangqian(Guangzhou University-Tamkang University Joint Research Center for Engineering Structure Disaster Prevention and Control, Guangzhou University, Guangzhou 510006, Chin)

机构地区：[1]广州大学-淡江大学工程结构灾害与控制联合研究中心,广东广州510006

出　　处：《四川建筑科学研究》2018年第4期31-38,共8页Sichuan Building Science

基　　金：国家自然科学基金(51478130;51208127);广州市科技计划项目(2014J4100141)

摘　　要：在超高层建筑结构设计过程中,结构舒适度是不可或缺的指标之一,舒适度问题可以通过结构自振频率约束来实现。本文基于CAARC的质点系简化模型,针对风洞实验得到的数据,分别以0°风向角、90°风向角(x与y方向)为研究对象,并对模态加速度与实际加速度反推得的频率值作对比,将频率约束加入到模型中,进行了结构参数确定性的结构抗风设计优化。结果表明,模态与实际情况下的优化结果有所差异,模态加速度约束下得到的频率较低,因此优化空间相对更大,且能够得到第j态的频率而实际加速度约束下得到的频率限值只能满足振型第1阶的,同时模态响应极限状态方程只考虑均方根部分,忽略了峰值因子项,避免了各国规范对峰值因子不同的取值造成的误差,因此本案例的模态加速度约束的反推频率更加适合。Structural comfort is one of the indispensable factors in the process of structural design of super high-rise buildings. The structural comfort problem can be realized by structural natural frequency constraint. Therefore,this paper is based on the simplification model of supermassive particle through wind tunnel experiment data in 0 ° or 90 ° wind direction（ the x and y direction）,which are the research object,and the modal acceleration is compared to the actual acceleration estimation in terms of frequency values,which will be added to the frequency constraints on optimization of certainty parameters of structural wind resistance design. The results show that there are some differences between the modal and the actual situation,the modal frequency is lower,so the space for optimization is larger,and the modal can get the j-th frequency while the actual acceleration can only get the first frequency and modal ignores the peak factor,which avoids the errors caused by the different values of peak factor in various countries. Therefore,the modal acceleration constraint of the case is more suitable.

关 键 词：超高层 结构舒适度 频率约束 模态加速度 实际加速度 

分 类 号：TU973.2[建筑科学—结构工程]