摘要
为避免大跨度转换钢桁架在上部大荷载作用下产生前、后施工界面裂缝,对合理起拱的钢桁架进行预加载消拱,采用整体液压同步张拉进行钢桁架同步预加载及卸载,并对加、卸载过程进行应力和变形监控,得到应力及位移变化曲线。同时采用有限元软件对加、卸载过程进行建模计算,得到应力及变形计算值,通过计算值和实际监测值对比,结果表明误差较小。该技术在实际使用中取得良好效果,并产生社会及经济效益。
In order to avoid the front and rear construction interface cracks of the large span transfer steel truss under the action of the upper large load,the preloading and arching of the reasonably arched steel truss was carried out,and the overall hydraulic synchronous tensioning was used to synchronously preload and unload the steel truss. The stress and deformation of the loading and unloading process are monitored,and the actual curves of stress and displacement are obtained. At the same time,the finite element software was used to model and calculate the loading and unloading process,and the calculated values of stress and deformation were obtained. By comparing the calculated value with the actual monitoring value,the result shows that the error is small,and it can be seen that the technology achieves good results in practical use and produces social and economic benefits.
作者
陈辉
刘洪亮
蔡峰
杨林
CHEN Hui;LIU Hongliang;CAI Feng;YANG Lin(Shanghai Baoye Group Co.,Ltd.Nanjing Branch,Nanjing,Jiangsu 210000,China)
出处
《施工技术》
CAS
2020年第8期70-73,共4页
Construction Technology
关键词
转换桁架
体外预应力
预加载
卸载
应力
变形
监测
有限元分析
transfer truss
external prestress
preloading
unloading
stress
deformation
monitoring
finite element analysis
