大跨度钢桁架结构施工监测与卸载分析  

Construction Monitoring and Unloading Analysis of Long-Span Steel Truss Structure

作　　者：浦磊 汤东婴[1,2] 魏晓斌[1,2] 孙正华 PU Lei;TANG Dongying;WEI Xiaobin;SUN Zhenghua(Jiangsu Construction Engineering Quality Inspection Center Co.,Ltd.,Nanjing Jiangsu 210033,China;Jiangsu Institute of Building Science Co.,Ltd.,Nanjing Jiangsu 210008,China)

机构地区：[1]江苏省建筑工程质量检测中心有限公司,江苏南京210033 [2]江苏省建筑科学研究院有限公司,江苏南京210008

出　　处：《工程质量》2023年第7期33-39,共7页Construction Quality

基　　金：“十四五”国家重点研发计划项目“住宅工程质量保障体系及关键技术研究”(2021YFF0602000);住房和城乡建设部项目“周边环境影响下既有建筑风险监测与预警评估技术研究”(K20221278)。

摘　　要：大跨度空间结构施工阶段所受荷载复杂,结构的平均风险率高、失效概率大,为了保证施工安全和施工质量,开展完备的施工监测以指导合理施工至关重要。某博物馆采用大跨度钢桁架结构,桁架最大跨度为220m,按照结构健康监测方法实施施工期监测并进行卸载分析。通过对该工程卸载阶段应力、变形及倾角进行监测,大部分测点前期变化较大,后期趋于平稳,监测数据基本在有限元计算值范围内。部分区域的铅垂向位移超过有限元计算值,建议在运营期健康监测阶段加强监测。利用有限元分析和现场监测的方法能有效指导施工,确保卸载过程安全可靠。The load of long-span spatial structure in the construction stage is complex,the average risk rate of the structure is high,and the failure probability is large.In order to ensure the construction safety and construction quality,it is very important to carry out complete construction monitoring to guide reasonable construction.A museum adopted a large span steel truss structure with a maximum span of 220 m.According to the structural health monitoring method,the construction period monitoring and unloading analysis were carried out.Through the monitoring of stress,deformation and inclination in the unloading stage of the project,most measuring points changed greatly in the early stage,and tended to be stable in the later stage.The monitoring data were basically within the range of finite element calculation value.The vertical displacement of lead in some areas exceeded the finite element calculation value,and it was recommended to strengthen the monitoring in the health monitoring stage of the operation period.The method of finite element analysis and field monitoring could effectively guide the construction and ensure the safety and reliability of unloading process.

关 键 词：大跨度 钢桁架结构 卸载 施工监测 有限元法 

分 类 号：TU758.11[建筑科学—建筑技术科学]