摘要
为确保索穹顶结构施工成型前索杆内力的平稳变化,提出了交替提升内拉环与张拉最外圈斜索的施工优化方法.首先,以施工过程中的平均结构应变能最小为优化目标,对内拉环的逐级提升高度进行优化;其次,通过仿真分析得到施工过程中的索杆内力和节点位移,并与仅张拉最外圈斜索的施工方法进行对比.结果表明:交替提升内拉环与张拉最外圈斜索的施工优化方法可有效减小施工过程中的索杆内力,降幅最大达61.83%,避免了施工成型前索杆内力的大幅波动,且结构位形变化较平缓,相邻施工步的竖向位移差最大为1.43 m,平均结构应变能较低,仅为55.03%,优化效果显著,验证了该优化方法对索穹顶结构施工模拟的适用性.
In order to ensure the smooth change of cable-strut internal forces before molding cable domes,a construction optimization method is proposed,focusing on alternately lifting the inner ring and tensioning the outermost diagonal cables.The lifting height of the inner ring is first optimized for minimizing average structural strain energy in the construction process.The cable-strut internal forces and nodal displacements from simulation are compared with those from the construction method with the tensioned outermost diagonal cables.The results show that,alternately lifting the inner ring and tensioning the outermost diagonal cables can effectively reduce the cable-strut internal forces by 61.83%,avoiding sharp fluctuation of cable-strut internal forces before molding.It causes more gentle change of structural configuration with 1.43 m maximum vertical displacement difference between adjacent construction steps,and low average structural strain energy of only 55.03%,which demonstrates its remarkable optimization effect.Thus,the proposed method is applicable to the construction simulation of cable domes.
作者
姜正荣
苏延
石开荣
李之吉
魏德敏
梁霖
JIANG Zhengrong;SU Yan;SHI Kairong;LI Zhiji;WEI Demin;LIANG Lin(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2024年第3期663-669,共7页
Journal of Southwest Jiaotong University
基金
广东省现代土木工程技术重点实验室课题(2021B1212040003)
关键词
索穹顶结构
交替提升与张拉
施工仿真
施工优化
cable dome
alternately lifting and tensioning
construction simulation
construction optimization
