大跨度钢箱系杆拱桥温差变形的规律与控制技术研究

发布时间：2018-12-08 14:47

【摘要】：随着我国桥梁建设迅猛发展,对系杆拱桥研究及应用也越来越多。以成都某钢箱系杆拱桥为对象,采用自动测温系统进行大桥主梁温度场的测试,根据钢箱梁顶板、顶板加劲肋、底板、底板加劲肋、腹板等实测温度变化,分析了钢箱梁温差变形对主梁线形控制和墩部温差变形对线形控制的影响,研究表明,由于温差的作用,主梁在横桥向发生的变化非常大,离梁部悬臂端部越近,横桥向变形与竖向挠度变形差值变化值越大,最大值分别为51.2、74.1 mm;钢箱梁两个壁墩间因日照温差,整个结构倾斜于温度较低的一侧。在顺桥的方向,钢箱梁壁墩向阴凉侧偏移距离为34.3 mm,主梁整体偏移约38 mm的距离;在横桥方向,墩顶偏移的距离为67.1 mm,主梁横向偏移约85 mm的距离。最后提出消除温度变形影响误差的控制措施为白天进行吊装定位、钢箱梁安装,晚上进行节点焊接和张拉索力施工等工序,早上进行主梁拱肋偏位、应力、标高等复测。
[Abstract]:With the rapid development of bridge construction in China, the research and application of tied arch bridge are more and more. Taking a steel box tied arch bridge in Chengdu as an example, the temperature field of the main girder of the bridge is measured by using an automatic temperature measuring system. According to the measured temperature changes of the steel box girder roof, the stiffening rib of the bottom plate, and the web plate, etc, the temperature field of the main girder of the bridge is measured. The influence of the temperature difference deformation of the steel box girder on the alignment control of the main girder and the temperature difference deformation of the pier on the linear control is analyzed. The results show that the variation of the main beam in the transverse direction of the bridge is very large due to the effect of the temperature difference, and the closer the girder is to the end of the cantilever, The difference between horizontal deformation and vertical deflection is greater, and the maximum values are 51.2 mm; and 74.1 mm;, respectively. Because of the difference of sunshine temperature between the two piers of the steel box girder, the whole structure is inclined to one side of the lower temperature. In the direction of the bridge, the deviation distance from the wall pier to the cool side of the steel box girder is 34.3 mm, the overall deviation of the main beam is about 38 mm, and the distance from the top of the pier is about 85 mm in the transverse direction of the bridge. Finally, the paper puts forward the control measures to eliminate the error of temperature deformation, such as hoisting and positioning during the day, installation of steel box girder, joint welding and cable tension construction at night, and repeated measurement of arch rib deviation, stress and elevation of the main girder in the morning.
【作者单位】：河北轨道运输职业技术学院;石家庄中天工程建设监理有限公司;
【基金】：河北省社会科学发展研究重点课题(201602120102) 河北省科技支撑项目(13211213D)
【分类号】：U448.225

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