高层建筑结构基本自振周期合理范围研究
Study on reasonable range of fundamental natural period of vibration of high-rise buildings
徐培福 1陈才华 2邱盛源2
作者信息
- 1. 中国建筑科学研究院有限公司,北京 100013
- 2. 中国建筑科学研究院有限公司,北京 100013;中建研科技股份有限公司,北京 100013
- 折叠
摘要
高层建筑基本自振周期T1反映了高层建筑质量和刚度分布特性,在结构方案设计阶段,控制基本自振周期在合理范围不仅能自动满足结构的主要设计指标,还能导向更合理的结构设计.通过分析国内837栋高度50 m以上高层建筑统计数据,得出不同设防烈度、不同高度分组高层建筑的基本自振周期的合理范围和分布规律,并基于简化模型推导了基本自振周期与结构高度关系的实用公式.统计数据分析以及实用公式均表明,T1与结构高度的平方根(√H)成正比,且T1/√H随高度增加而增大,随设防烈度提高而减小.高度250 m以上高层建筑基本自振周期合理范围上限值在0.40√H左右,其中8度设防区为0.37√H、7度设防区为0.42√H、6度设防区为0.44√H;如果达到或超过0.50√H,则结构刚度过柔.
Abstract
The fundamental natural period of vibration(T1)of high-rise buildings reflects the quality and stiffness distribution characteristics of high-rise buildings.In the structural scheme design stage,controlling the fundamental natural period of vibration within a reasonable range can not only automatically meet the main design indicators of the structure,but also guide more reasonable structural design.In this article,the statistical data of 837 high-rise buildings over 50 meters in China were analyzed,and the reasonable range and distribution law of the fundamental natural period of vibration of high-rise buildings with different seismic design intensities and heights were obtained.Based on a simplified model,practical calculation formulas of T1 considering structural height were derived.Statistical data analysis and practical formulas indicate that T,is directly proportional to the square root of the structural height(√H)and the scale factor(T1/√H)will increase when the height increases and will decrease when the fortification intensity increases.The upper limit of the reasonable range of T1/√H of high-rise buildings with a height of more than 250 m is around 0.40,and is 0.37 for the seismic fortification intensity of 8,0.42 for the intensity of 7,and 0.44 for the intensity of 6.If T1/√H reaches or exceeds 0.50,the structure is too flexible.
关键词
高层建筑/基本自振周期/周期范围/合理刚度/实用公式/周期限值Key words
high-rise building/fundamental natural period of vibration/range of period/reasonable stiffness/practical formula/permissible value of period引用本文复制引用
基金项目
国家重点研发计划(2022YFC3801200)
中国建筑科学研究院有限公司科研项目(20220122330730017)
中建研科技股份有限公司科研项目(20221902977130039)
出版年
2024
国家科技期刊平台
NSTL
万方数据