某大跨度钢网架结构施工监测及模拟

对某大跨度复杂钢网架结构进行施工过程跟踪监测,包括钢构件吊装过程中的敏感及重要构件的应力变化监测,临时支承点拆除时结构支承点的变形监测及大型焊接球整体提升焊接时焊接环的变形监测。监测结果表明:应力及变形均在合理范围之内,并最终稳定于某一值,监测效果良好。对结构在施工中各种工况下的应力及变形进行了有限元仿真分析,将实测应力值和变形值与有限元分析结果进行比较,基本吻合,表明有限元分析较好地模拟了施工过程中的应力及变形变化。

SIMULATION ANALYSIS AND CONSTRUCTION MONITORING OF A LARGE SPAN STEEL GRID STRUCTURE

A long-span complex steel grid structure was monitored closely during the construction process,including stress change monitoring for sensitive and important steel components in hoisting procedure,and supporting point deformation monitoring for demolishment of temporary support structure,and welding ring deformation monitoring for ascent of the whole welding ball.Monitoring results demonstrated that stress and deformation were in reasonable range,and eventually stabilized to a value,and the monitoring effect was fine.The steel grid structure was conducted with finite element simulation analysis on stress and deformation of various working conditions during construction course.The measured stress and deformation values were compared with those of finite element analysis,and substantial agreement was obtained,which demonstrated that finite element analysis simulated the change of stress and deformation in construction process satisfactorily.