建筑结构学报2023，Vol.44Issue(12)：59-71,13.DOI:10.14006/j.jzjgxb.2022.0611
索穹顶结构地震作用计算方法的对比分析
Comparative analysis on earthquake action calculation methods of cable dome structures
摘要
Abstract
Due to the structural nonlinearity,the earthquake action calculation method for the flexible long-span roof structures,typical cable domes,has not been specified in the GB 50011-2010'Code for seismic design of buildings'.For the equilibrium configuration under the representative value of gravity load,the applicability of the mode-superposition response spectrum method to calculate the earthquake action of cable dome structures is investigated by comparing the calculation results with those obtained by the time history method.Artificial seismic waves are generated according to the design response spectrum and employed in the time history analysis to ensure the consistency of seismic inputs.It is pointed out that the Rayleigh damping coefficients should be determined based on the mode shapes dominantly contributing to the earthquake action of the roof cable dome structure,otherwise a significant overestimation of the structural damping effect will occur in the time history analysis and result in an underestimation of the obtained structural seismic responses.Based on the modal participating mass factor,an index is proposed for judging the mode shapes which are dominantly contributing to the earthquake action of the roof cable dome structure.The two methods are employed to calculate structural responses of cable dome structures under the frequent-occurred earthquake corresponding to different deflection-span ratio limits(prestress levels).For the illustrative Geiger and Levy cable domes that both satisfy the non-seismic design check,the calculation results show that the structural seismic responses obtained by the mode-superposition response spectrum method well match with those obtained by the time history method,and its applicability for the seismic action calculations of this type of flexible roof structure is verified.关键词
索穹顶/地震作用计算/振型分解反应谱法/时程分析法/瑞利阻尼模型/振型参与质量系数Key words
cable dome/earthquake action calculation/mode superposition response spectrum method/time history method/Rayleigh damping model/modal participating mass factor分类
建筑与水利引用本文复制引用
谯钰,刘宏创,邓华,董石麟..索穹顶结构地震作用计算方法的对比分析[J].建筑结构学报,2023,44(12):59-71,13.基金项目
国家自然科学基金项目(51978605). （51978605）
