风与地震作用下平面索网幕墙系统的动力性能研究
Dynamic Performance for a Cable-Net Supported Curtain Wall System Under Wind and Seismic Loadings
王国威 1张鹏 2张明 3卢文胜1
作者信息
- 1. 同济大学 土木工程防灾减灾全国重点实验室,上海 200092
- 2. 江西理工大学 土木与测绘工程学院,江西 赣州 341000
- 3. 北京建工四建工程建设有限公司,北京 100024
- 折叠
摘要
平面索网幕墙被广泛应用于大型公共建筑中,因具有阻尼小、刚度低、非线性强等特点,其在强风与地震作用下易出现索力突变、变形过大、面板损伤等不利现象.建立了索网幕墙系统的精细化数值模型,量化了风、地震作用下相邻主结构对幕墙动力性能的影响,分析了两种灾害共同作用下的索网动力响应及面板、密封胶安全状态,计算了幕墙的风振系数并与规范参考值进行对比.研究结果表明:考虑主结构影响的索网幕墙的频率平均减小了12%,地震作用下中部拉索的峰值位移比为6.5,远大于风致响应,计算索网幕墙的地震响应时不可忽略主结构的影响.两种灾害共同作用时,索网位移的增幅大于索力的增幅,位移响应对外部激励变化更加敏感,且位于幕墙顶部的玻璃面板与密封胶的应力均超过设计强度,应在运维过程中予以重点关注.此外,对索网幕墙风致响应结果进行数理统计,得到了可供工程设计参考的风振系数.
Abstract
The cable-net supported glass facade(CSGF)is widely used in large public buildings.Due to its low damping,low stiffness,and strong non-linearity,the CSGF is subject to sudden changes in tension,excessive deformation,and panel damage under strong wind and seismic excitations.This paper established a refined numerical model of the CSGF system to quantify the effect of the adjacent main structures on the facade dynamic performance.The cable-net responses as well as the panel and sealant safety state under wind and seismic loadings were analyzed,and the calculated wind vibration factors were compared with the code reference values.The results show that the facade frequency considering the effect of main structures is reduced by an average of 12%.The peak displacement ratio of the central cable under seismic loading reaches to 6.5,much larger than that of the wind-induced response,indicating that the effect of main structures should be considered in the CSGF seismic response.For two hazards simultaneous excitation,the increase in cable-net displacement is greater than tensions,reflecting that the displacements are more sensitive to external excitation change.The top glass panel and sealant stresses have exceeded the design strength and should be paid more attention to during operation and maintenance.Moreover,the CSGF wind-induced response results are statistically analyzed to obtain the wind vibration factors for engineering design.
关键词
索网幕墙系统/非线性/主结构影响/风与地震作用/动力性能/风振系数Key words
cable-net supported facade system/non-linearity/effect of main structure/wind and seismic loading/dynamic performance/wind vibration factor引用本文复制引用
基金项目
国家自然科学基金(52178501)
同济大学土木工程高峰学科建设项目(Ⅰ类)(2022-3-ZD-06)
江西理工大学校级纵向科研项目(205200100550)
出版年
2024
国家科技期刊平台
NSTL
万方数据