摘要
以MSS50双幅整体浇筑式移动模架造桥机作为研究对象,利用有限元软件对该造桥机整体结构进行刚度和强度校核,并依据计算结果,确定了该造桥机各重要部位的应力和变形检测位置,在造桥机使用前进行预压载试验,对检测位置要进行全程监控.研究结果表明,理论分析与实测结果基本吻合,该造桥机满足强度和刚度要求,实测挠度曲线可以为施工中预拱度调整提供参考.由于实际加载过程中主梁上承受载荷的不均匀性,各测点应力并非按线性规律变化,甚至出现瞬时应力超过最大载荷情况下的应力,因此,对加载过程进行监控是必要的.由于该双幅整体浇筑式移动模架造桥机结构庞大,受加工和安装误差影响,在加载过程中左右侧支腿受力出现一定偏差和不均匀性,这在施工过程中,尤其在有风载施工过程中,应加强观察和检测.该研究成果也可以为其他移动模架设计及施工提供参考.
MSS50 double amplitude integrally overhead launching gantry was taken as study object in this paper.Using finite element analysis software,the strength and rigidity of it was checked.According to the results of the calculation,the stress and deformation test points were determined.Before the overhead launching gantry used,the pre-loading test was done.The tes tresults shown that：the analysis and experimental results were basically coincide,and the overhead launching gantry satisfied the intensity and the rigidity requirement.The measured deflection curve could provide reference for adjusting the precamber.As the non-uniformity of the actual load in the loading process,the stress of each measuring point did not change in the linear,even appearing the stress exceed the stress of the maximum loading case.Therefore,to monitor the loading process was necessary.Owing to the structure of the double amplitude overhead launching gantry very large,affected by the processing and installation error,the stress on the leftright legs appeared deviation and non-uniformity in loading processing,which should be strengthened the observation and detection in the construction processing,especially in the processing of wind load.The results in the paper can also provide reference for the design and construction of the overhead launching gantry.
出处
《中国工程机械学报》
北大核心
2017年第4期365-369,共5页
Chinese Journal of Construction Machinery
关键词
双幅整体浇筑
移动模架
有限元分析
预压载试验
预拱度
double amplitude pouring
overhead launching gantry
finite element analysis
preloading test
pre-camber
