大跨屋盖空间桁架施工方案及应力监控分析  

Analysis of construction scheme and stress monitoring of a long-span roof spatial truss

作　　者：夏志远 邓星河 唐柏鉴 陈鑫[1] 毛小勇[1] 钱彬彬 吕春播 黄荣彬 XIA Zhi-yuan;DENG Xing-he;TANG Bai-jian;CHEN Xin;MAO Xiao-yong;QIAN Bin-bin;LV Chun-bo;HUANG Rong-bin(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;China Construction First Group Construction&Development Co.,Ltd.,Beijing 100102,China;Housing and Urban-Rural Development Bureau of Xiuzhou District of Jiaxing,Jiaxing 314031,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]中建一局集团建设发展有限公司,北京100102 [3]嘉兴市秀洲区住房和城乡建设局,浙江嘉兴314031

出　　处：《空间结构》2023年第3期68-75,共8页Spatial Structures

基　　金：国家自然科学基金项目(52178294,52208188);江苏省高等学校自然科学研究项目(19KJB560021);江苏省科协青年科技人才托举工程(2021-077);苏州市建设系统科研项目.

摘　　要：空间钢结构因其造型美观、可塑性强,多应用于艺术中心、体育场馆等空间需求较高的建筑结构.但由于结构跨度大、体系复杂、施工难度高,且受力状态受施工过程影响较大,应针对不同结构提出可行的施工方案并进行有效的分析论证.依托嘉兴文化艺术中心美术馆大跨屋盖空间桁架为研究对象,制定其施工方案和应力监控方案,基于MIDAS Gen软件,模拟屋盖空间桁架施工过程,并与实测关键截面应力值对比分析.研究表明,美术馆屋盖空间桁架在支撑拆除后,悬挑端位移及应力较大,最大应力值达到约150MPa,但各工况位移及应力满足限值要求。屋盖空间桁架的应力增量模拟与实测值对比显示,各工况结构的应力状态稳定,钢材处于弹性工作阶段,实测应力增值与模拟值基本吻合,变化趋势一致.空间桁架施工方案合理,可行性较好.采用临时支撑处位移监控与关键点应力增量监控相结合的方法,辅以有限元分析,可较好实现施工过程监控.The steel space structure is mostly used in art centers,stadiums and other structures with high space demand because of its beautiful shape and strong plasticity.However,due to the large span,complex structural system,high difficulty in construction and the affected stress distribution by construction procedure,it is necessary to put forward feasible construction schemes for different structures and carry out effective analysis and demonstration.Based on the long-span roof spatial truss over the art museum of Jiaxing Culture and Art Center,the construction scheme and stress monitoring scheme are developed respectively.Based on MIDAS Gen software,the construction process of spatial truss was simulated,and the stress values of key sections were compared with the measured values.Results show that,the displacement and stress of the cantilever end of the roof truss are large after the temporary support was removed,and the maximum stress value was about 150MPa,but the displacement and stress under each working condition meet the limit requirements.The comparison between the stress increment simulation and the measured value of spatial truss showed that,the stress state of the structure under each working condition was stable,and the steel was in elastic working stage.The measured stress increment was basically consistent with the simulated value,and the change trend was consistent.The construction scheme of the roof truss is reasonable and feasible.The combination of displacement monitoring at temporary support and stress increment monitoring at key points,supplemented by finite element analysis,can realize the monitoring of construction process.

关 键 词：大跨桁架 空间钢结构 施工方案 应力监控 

分 类 号：TU745.2[建筑科学—建筑技术科学]