大矢跨比开口球壳的施工过程优化分析与监测  

Optimization Analysis and Monitoring of Construction Process of Open Spherical Reticulated Shell Structure with a Large Rise-to-Span Ratio

作　　者：石开荣[1,2] 林志毅 姜正荣[1,2] 陈春光 陈一乔 梁军 SHI Kairong;LIN Zhiyi;JIANG Zhengrong;CHEN Chunguang;CHEN Yiqiao;LIANG Jun(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Subtropical Building and Urban Science,South China University of Technology,Guangzhou 510640,China;Guangdong Construction Engineering Group Ltd.,Guangzhou 510110,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学亚热带建筑与城市科学全国重点实验室,广东广州510640 [3]广东省建筑工程集团有限公司,广东广州510110

出　　处：《西南交通大学学报》2024年第6期1440-1447,1486,共9页Journal of Southwest Jiaotong University

基　　金：广东省现代土木工程技术重点实验室资助项目(2021B1212040003)。

摘　　要：为保证复杂空间网格结构的施工安全性,对其进行施工过程优化分析与监测研究.以某大矢跨比单层开口球面网壳结构为例,对该复杂异形结构进行施工全过程的有限元模拟,通过变化支座边界条件、肋杆轴线形状和临时支撑胎架支承方式建立不同的有限元分析模型,探讨其关键构件应力与结构位移的变化情况,以对施工过程进行优化分析;在此基础上,采用有临时支撑胎架的弧形杆模型作为最终计算模型进行施工模拟,并将卸载前后的计算结果与现场监测数据进行对比分析,以验证施工过程模拟结果的准确性;进一步对临时支撑胎架的失效敏感性进行研究,以避免出现结构安全问题.结果表明:有限元分析模型与实际结构较为相符,卸载前后各测点的应力变化较小,最大拉、压应力变化量分别为10.61 MPa和−5.67 MPa,该大矢跨比异形球面网壳结构在施工过程中处于可控状态;某一支撑胎架失效对其周边相邻区域的杆件应力、结构位移有较大影响,其中杆件应力最大变化为28.00 MPa,竖向位移最大变化为13 mm,因此,施工过程中应确保支撑胎架的可靠性.To ensure the construction safety of the complex spatial grid structure,the optimization analysis and monitoring of the construction process were carried out.An open single-layer spherical reticulated shell structure with a large rise-to-span ratio was taken as an example,and the construction process of this complex special-shaped structure was simulated through finite element analysis(FEA).By changing the boundary conditions of the support,the shape of the rib axis,and the support mode of the temporary support jig frame,different FEA models were established.The stress variations of key members and the structural displacement were analyzed to optimize the construction process.On this basis,the arc rod model with a temporary support jig frame was used as the final calculation model for construction process simulation,and the calculation results before and after unloading were compared with the on-site monitoring data to verify the accuracy of the FEA model in simulating the construction process.The failure sensitivity of the temporary support jig frame was further studied to avoid structural safety problems. The results show that the FEA model is consistent with the actual structure. The stress of each measuring point before and after unloading changes slightly, and the maximum tensile and compressive stress changes are 10.61 MPa and −5.67 MPa, respectively. The special-shaped spherical reticulated shell with a large rise-to-span ratio is in a controllable state during construction. The failure of a certain temporary support jig frame would have a great influence on member stress and structural displacement in the adjacent area. The maximum change of the member stress is 28.00 MPa, and that of the vertical displacement is 13 mm. Therefore, the reliability of the support jig frame shall be ensured during the construction.

关 键 词：网壳结构 施工过程 优化 监测 卸载 

分 类 号：TU393.3[建筑科学—结构工程]