基于多尺度有限元的网架结构施工过程分析
Research on Construction Scheme Design and Monitoring of Grid Structure Based on Multi-Scale Finite Element Method
张龙海 1王世玉 2李伟 1董业廷 1孙宇 1张营营 3徐俊豪3
作者信息
- 1. 中建八局第一建设有限公司,济南 250100
- 2. 中国铁路济南局集团有限公司,济南 250000
- 3. 中国矿业大学力学与土木工程学院建筑工程系,徐州 221116
- 折叠
摘要
网架结构的施工过程模拟多采用杆系模型,不能反映网架节点以及顶升处的复杂应力情况,容易导致网架结构施工过程出现安全隐患,为此提出了基于多尺度有限元的网架结构施工过程分析方法.首先对比了位移协调、做功协调以及二者组合的多尺度有限元界面连接模型.随后以济宁北站网架结构施工过程为例,通过多尺度有限元分析了三种典型施工方案下的结构力学响应.结果表明:采用基于位移协调的多尺度界面连接方法用于网架结构施工过程分析可兼顾实施效率和计算精度,精细单元长度取0.9～1.1倍圆管截面外径时能够避免圆管截面出现应力集中,符合平截面假定.采用"现场地面分块拼装、整体顶升、高空散装"的施工方案,结构最大应力为292.3 MPa,最大位移为59.6 mm,最为安全.
Abstract
The construction simulation research of grid structure mostly adopts the rod system model,which cannot accurately reflect the complex stress and damage at the grid structure nodes and jacking nodes,which is easy to lead to potential safety hazards in the construction of grid structure.Based on this,this paper compares three multi-scale finite element interface connection models.The length value of the fine element of the grid tube structure is discussed.Based on the multi-scale finite element simulation of the construction process of the grid structure of Jining North Station,the structural mechanical response under three typical construction schemes is analyzed and compared with the field monitoring data.The results show that the multi-scale interface connection method based on displacement coordination can better complete the coupling between different scale models.When the fine element length of the multi-scale model is 0.9～1.1 times of the outer diameter of the round pipe section,the stress concentration of the circular tube section can be avoided,and the section displacement conforms to the plane section assumption.The maximum stress of the construction scheme of"site ground block assembly,overall jacking and bulk at height"is 292.3 MPa,the maximum displacement is 59.6 mm,and the stress at the joint is close to the yield stress.The results of numerical simulation analysis are basically consistent with the overall trend of field monitoring data analysis.Relevant research methods can provide reference for similar projects.
关键词
网架结构/多尺度有限元/界面链接模型/力学响应/施工方案Key words
grid structure/multiscale finite element/mechanical response/construction plan/on site monitoring引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据