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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第4期    总第60期    2014年8月

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文章编号:1672-7029(2014)04-0046-05
悬挑钢梁吊装工艺的力学分析与评价
彭仪普,朱铎义

(中南大学 土木工程学院,湖南 长沙 410075)

摘 要: 以宁波南站钢结构站房为背景,从钢材的力学性能角度分析采用分段吊装法和整体吊装法进行大跨度超重悬挑钢结构吊装时结构的根部和支撑杆受力情况,采用大型有限元软件对2种施工方法进行模拟,将把2种施工方法得出的真实数据与有限元软件计算出的预测数值进行分析比较。研究结果表明:在进行大跨度超重结构吊装时,在卸载完成时整体吊装法比分段吊装法在根部最大应力大出较多,且比有限元软件的模拟值略大。整体吊装法施工过程中撑杆最大应力比分段吊装法的撑杆最大应力小。在采用整体吊装时有必要对悬挑结构的根部进行加固,采用分段吊装时有必要对支撑杆件进行加固。

 

关键字: 悬挑钢结构;吊装方法;监测;有限元;钢结构施工

Mechanical analysis and evaluation of cantilever steel beam lifting and installing technology
PENG Yipu, ZHU Duoyi

School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:On the background of the cantilever steel beam of Ningbo south railway station, the mechanical properties of cantilever beam root stress and supporting bar stress were analyzed when lifting the large span and cantilever steel structures by the construction methods of segmental hoisting or integral hoisting. Then the two construction methods were simulated by large-scale finite element software, and the simulation results were compared with the real data. The research results show that when lifting the large span and cantilever steel beams, the maximum root stress calculated by the method of integral lifting is lager than that by the method of segmental hoisting after unloading, and the finite element simulation results is slightly smaller. However, the maximum stress of supporting bar is smaller when calculating by the method of segmental hoisting. It is necessary to reinforce the root of cantilever structure when using the method of integral lifting and it is essential to reinforce the bar stay of cantilever structure when adopting the approach of segmental hoisting.

 

Key words: overhanging steel structure; the hoisting method; monitoring; finite element; steel structure construction

ISSN 1672-7029
CN 43-1423/U

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