异型单元式拼装人行天桥雨棚施工技术应用  

Application of Special-shaped Unit-type Assembled Pedestrian Bridge Canopy Construction Technology

作　　者：陈德武 胡健健 赵运 郭伟河 CHEN De-wu;HU Jian-jian;ZHAO Yun;GUO Wei-he(Guangzhou Municipal Dunjian Construction Co.,Ltd,Guangzhou 511400;China Construction Fourth Bureau Civil Engineering Co.,Ltd,Guangzhou 518000)

机构地区：[1]广州市盾建建设有限公司,广州511400 [2]中建四局土木工程有限公司,深圳518000

出　　处：《广州建筑》2024年第4期53-57,共5页GUANGZHOU ARCHITECTURE

摘　　要：为解决异型拼装式人行天桥雨棚安装精度及安装效率等问题,通过采用BIM+Midas Gen有限元分析软件进行几何建模和网格划分,建立胎架和吊装构件模型,合理地划分雨棚网格,将其分成弧度较小的单元后进行单独吊装及空中原位安装,合理布置吊点和精密测控。结果表明:采用BIM+有限元软件分析、分段分节优化、安装方法优化、支撑胎架布置等一系列措施,得出施工过程中拱桁架最大竖向位移为39.68 mm,最大压应力为92.30 N/mm^(2),最大拉应力为104.30 N/mm^(2)。结构容许变形值、最大压应力和拉应力均满足规范要求;可以精确实现大跨度人行天桥钢结构的安装作业,且可以显著提高安装效率。研究成果也可为结构造型复杂、悬挑长度长、跨度大、且在空间呈现异形弯扭造型的人行天桥雨棚施工提供新思路。In order to solve the problems of installation accuracy and efficiency of special-shaped assembled pedestrian bridge canopy,the geometric modeling and meshing were carried out by using BIM+Midas Gen finite element analysis software,the tire frame and hoisting component model were established,the canopy grid was reasonably divided,and the unit with a small arc was divided into separate hoisting,and the in-situ installation in the air was carried out,and the reasonable lifting point layout and precise measurement and control were carried out.The results show that the maximum vertical displacement of the arch truss is 39.68mm,the maximum compressive stress is 92.30N/mm^(2),and the maximum tensile stress is 104.30N/mm^(2) by using a series of measures such as BIM+finite element software analysis,segmentation and section optimization,installation method optimization,and supporttire frame layout.The allowable deformation value,maximum compressive stress and tensile stress of the structure meet the requirements of the specification.Theinstallation ofthe steel structure of the long-span pedestrian bridge can be accurately realized,and the installation efficiency can be significantly improved.The research results can also provide new ideas for the construction of pedestrian bridge canopies with complex structural shapes,long cantileverlengths,large spans,and special-shaped bending and torsional shapesin space.

关 键 词：钢结构雨棚 异型 双曲面 单元式拼装 有限元分析 

分 类 号：TU744[建筑科学—建筑技术科学]