摘要
在装配式双构件顶拱结构的实际拼装过程中,因托拱千斤顶行程不同步,易导致千斤顶虚托现象发生。基于三维数值计算,分析不同虚托条件下装配式双构件顶拱结构的力学性能,并依据最大主应力失效准则,完成不同虚托状态下装配式顶拱结构的力学性能评价。研究分析发现:上部承托平台虚托时,结构内部最大主应力向压应力趋势发展;下部承托平台虚托时,结构内部的最大主应力向拉应力趋势发展;仅上部承托平台虚托时,装配式双构件顶拱结构主体均满足最大主应力抗拉设计限值;出现任一下部承托平台虚托时,装配式双构件顶拱结构局部区域不满足最大主应力抗拉设计限值。
In the assembly of a prefabricated double-member arch structure,a jack empty support phenomenon is easily caused by stroke asynchronism.Based on a three-dimensional numerical calculation,this study investigated the different empty supports fabricated under the condition of a double-component top arch structure and their mechanical properties,and on the basis of maximum principal stress failure criterion,analyzed the different empty mechanical properties of a fabricated under-roof arch structure.Evaluation,research,and analysis found that:(1)when the upper supporting platform is in empty support,the maximum principal stress in the structure is compressive stress;(2)when the lower supporting platform is in empty support,the maximum principal stress in the structure is tensile stress;(3)when only the upper supporting platform is in empty support,the main body of the prefabricated double-member top arch structure meets the maximum principal stress tensile design limit;and(4)when there is an empty support in the lower supporting platform,the partial area of the prefabricated double-member top arch structure does not meet the maximum principal stress tensile design limit.
作者
彭智勇
杨秀仁
王臣
杨明
PENG Zhiyong;YANG Xiuren;WANG Chen;YANG Ming(National Engineering Research Center for Green and Safe Construction Technology in Urban Rail Transit,Beijing 100037;Beijing Urban Construction Design and Development Group Co.,Ltd.,Beijing 100037)
出处
《都市快轨交通》
北大核心
2023年第2期107-111,共5页
Urban Rapid Rail Transit
基金
国家重点研发计划(2017YFB1201104)
北京城建集团创新项目(CJJT2022-002)。
关键词
轨道交通
装配式地铁车站
双构件顶拱结构
顶拱拼装
千斤顶虚托
rail transit
prefabricated metro station
top arch construction with double block
assembled crown
empty support about jack
