单层铝合金球面壳顶升建造过程仿真分析  

Simulation Analysis of Single⁃layer Aluminum Alloy Spherical Shell Jacking Construction Process

作　　者：闫亚杰 仲志强[2] 陈冉 李江 李欣凯 闫月勤 YAN Yajie;ZHONG Zhiqiang;CHEN Ran;LI Jiang;LI Xinkai;YAN Yueqin(College of Intelligent Construction,Shanxi University of Electronic Science and Technology,Linfen,Shanxi041000,China;College of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi030024,China;Shanxi Fifth Construction Group Co.,Ltd.,Taiyuan,Shanxi030025,China)

机构地区：[1]山西电子科技学院智能建造学院,山西临汾041000 [2]太原理工大学土木工程学院,山西太原030024 [3]山西五建集团有限公司,山西太原030025

出　　处：《施工技术（中英文）》2024年第22期100-106,共7页Construction Technology

基　　金：国家自然科学基金(51208332);山西省基础研究计划(2022030212111761)。

摘　　要：单层网壳结构是铝合金结构大跨度建筑屋盖选用较多的结构形式,但对整体顶升法建造单层球面壳的研究较少。结合项目建造过程和仿真分析,采用4种顶升方案对整体顶升法建造单层球面网壳结构进行研究。通过对4种顶升方案工作状态下网壳挠度、杆件应力、顶升点支反力及位移等因素进行对比分析,初选出单圈12个点顶升方案;通过分析4种水平面内投影圆的直径D_(d)与网壳支座所在圆直径D_(0)的比值(D_(d)/D_(0))参数下的网壳结构,得出D_(d)/D_(0)=3/5的顶升方案为最佳方案。利用MIDAS对顶升支架进行仿真分析,得到其受压极限承载力为478kN,是顶升点最大支反力的5.7倍,可满足顶升要求。通过支承转换的仿真分析,提出顶升高度超设计标高0.200m、增加牛腿、限位板、滚轴等临时措施,可满足支承转换及网壳找形要求。通过开展温度对网壳结构、杆件的影响分析,验证了采用年加权平均温度作为基准温度的合理性。Single-layer reticulated shell structure is a popular structure for large-span aluminum alloy building roof.However,there are few researches on single-layer aluminum alloy spherical shell jacking.In this paper,combining with the project construction process and simulation analysis,the single-layer spherical latticed shell structure constructed by monolithic jacking method with four jacking schemes.Through the comparative analysis of the forctors such as net shell deflection,rod stress,jacking point support reaction force and displacement under the working condition of four jacking schemes,a 12-point jacking scheme of a single circle was initially selected.By analysing four reticulated shell jacking structures based on the ratio between the diameter of the projection circle in the horizontal plane and the diameter of the circle where the reticulated shell support is located(D_(d)/D_(0)),it is concluded that jacking schemeis the bestone at D_(d)/D_(0)=3/5.The simulation analysis results of the jacking bracket using MIDAS show that the compressive ultimate bearing capacity is 478kN,which is 57 times of the maximum support reaction force at the jacking point,and can meet the jacking requirements.Through the simulation analysis of support conversion,it is proposed that the jacking height exceeds the design elevation by 0200m,and temporary measures such as increasing bull legs,limit plates and rollers can meet the requirements of support conversion and mesh shell shape finding.By carrying out the analysis of the influence of temperature on the structure and rods of the mesh shell,the reasonableness of adopting the annual weighted average temperature as the reference temperature is verified.

关 键 词：铝合金 单层球面壳 顶升 模拟 施工技术 

分 类 号：TU758[建筑科学—建筑技术科学]