钢底板-波形钢腹板连续刚构桥悬臂拼装异步施工线形控制技术研究

Research on Asynchronous Construction Linear Control Technology for Cantilever Assembly of Steel baseboard - Steel Corrugated Web Continuous Rigid-frame Bridge

摘要:

钢底板-波形钢腹板连续刚构桥悬臂拼装异步施工过程复杂,线形控制难度较大。本文通过数值分析与现场监测相结合的方式,建立有限元计算模型,讨论了剪切变形、相对湿度等对主梁挠度的影响,进一步优化预拱度,同时结合监测数据进行分析,结果表明：剪切变形对主梁挠度的影响较大,对于波形钢腹板刚构桥,其挠度计算不能忽略该部分的影响；在进行预拱度设置时,应重视环境相对湿度的影响；通过对主梁各工况变形的监测,主梁实际变形规律与理论基本相符,主梁合龙后线形平顺。

Abstract:

The asynchronous construction process of the cantilever assembly of the continuous rigid-frame bridge with steel baseboard - steel corrugated web is complicated and the linear control is difficult. The finite element calculation model is established by the combination of numerical analysis and on-site monitoring. The influence of shear deformation, relative humidity and the other factors on the deflection of the main beam is discussed. The camber is further optimized. And also monitoring data are analyzed. The results show that the shear deformation has a great influence on the deflection of the main girder. For the rigid frame bridges with corrugated steel webs, the influence of this part cannot be ignored in the calculation of the deflection. The attention should be paid to the influence of the environmental relative humidity when the camber is set up. By monitoring the deformation of the main beam under various working conditions, the actual deformation law of the main beam is basically consistent with the theory. The alignment of the main beam is smooth after closing.