TMD系统在单层球面网壳竖向减震中的应用

发布时间：2018-02-09 15:56

本文关键词： TMD 单层球面网壳竖向地震作用 Kanai-Tajimi模型参数优化应用范围　出处：《结构工程师》2016年05期 　论文类型：期刊论文

【摘要】：随着空间网格结构朝着大跨度、大空间的方向发展,结构在竖向地震作用下的响应不容忽视。为降低单层球面网壳在竖向地震作用下的结构响应,采用TMD系统对其进行竖向减震控制。以K8型单层球面网壳为研究对象,基于Kanai-Tajimi过滤白噪声模型合成了4条代表不同场地类别的激励波进行动力时程分析,以结构最大节点位移、最大Mises应力和最大加速度综合减震率为参考指标,探求了TMD质量比、调谐频率、阻尼比等参数对减震效果的影响规律,并优化分析了TMD系统在网壳上的布置位置。对网壳结构进行了矢跨比参数分析,比较发现:网壳矢跨比分别为1/7、1/5和1/3时,TMD系统减震效果呈随矢跨比增大而下降的趋势。建议TMD系统应用于单层球面网壳上时,其矢跨比不宜大于1/5。
[Abstract]:With the development of spatial grid structure in the direction of large span and large space, the response of the structure under vertical earthquake can not be ignored, in order to reduce the structural response of single-layer spherical reticulated shell under vertical earthquake. Taking K8 single-layer spherical reticulated shell as the research object, four excitation waves representing different site types are synthesized based on Kanai-Tajimi filtered white noise model for dynamic time history analysis, and the maximum node displacement of the structure is taken as the maximum node displacement. The influence of TMD mass ratio, tuning frequency, damping ratio and other parameters on the damping effect is studied. The maximum Mises stress and the maximum acceleration damping rate are taken as the reference indexes, and the effects of the parameters such as TMD mass ratio, tuning frequency and damping ratio on the damping effect are explored. The location of the TMD system on the reticulated shell is optimized and the rise-to-span ratio parameters of the latticed shell are analyzed. It is found that the damping effect of TMD system decreases with the rise-span ratio of 1 / 7 / 1 / 5 and 1/3, respectively. It is suggested that when the TMD system is applied to single-layer spherical reticulated shells, the ratio of vector to span should not be greater than 1 / 5.
【作者单位】：天津大学建筑工程学院;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】：国家自然科学基金项目(91315301)
【分类号】：TU399;TU352.1

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