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

作　　者：徐培福 陈才华 邱盛源 XU Peifu;CHEN Caihua;QIU Shengyuan(China Academy of Building Research,Beijing 100013,China;China Academy of Building Research Technology Limited Company,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013 [2]中建研科技股份有限公司,北京100013

出　　处：《建筑结构学报》2024年第6期16-24,共9页Journal of Building Structures

基　　金：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)。

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,T_(1)与结构高度的平方根(√H)成正比,且T_(1)/√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。The fundamental natural period of vibration(T_(1))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 T,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(T_(1)/√H)will increase when the height increases and will decrease when the fortification intensity increases.The upper limit of the reasonable range of T_(1)/√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 T_(1)/√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 

分 类 号：TU973.3[建筑科学—结构工程]