大跨度部分斜拉桥施工控制温度效应影响研究

Research of Temperature Influence on Large-span Cable-stayed Bridge during Construction Control

温度效应是大跨度桥梁施工控制的影响因素之一。通过建立大连市长山大桥Midas模型,分别模拟桥梁构件整体升温、桥梁构件局部温差对大跨径桥梁斜拉索索力及主梁挠度的影响。通过对桥梁主桥斜拉索,主梁上、下缘,桥塔、大气温度的连续测量,以及在相应时间段监测关键斜拉索索力变化及主梁关键截面的挠度变形,并根据理论模拟研究及现场实测可知,温度效应对大跨度部分斜拉桥施工控制影响较大。从温度效应的影响考虑,对大跨度部分斜拉桥施工及测量提出可行性建议。

The temperature effect is one of influence factors on the construction control of long-span bridge.The establishment of the Midas model of Changshan Bridge in Dalian separately simulates the influences of overall warming and local temperature difference of bridge members on the stayed cable force and the main beam deflection of large-span cable-stayed bridge. According to the continuous measure of the main bridge stayed cable, the upper and lower edges of the main beam, the pylon and the aerosphere temperature, and the variation of key stayed cable force and the deflection deformation of key section of the main beam monitored in the corresponding period, and based on the theoretical simulating analysis and the site measured data, it can be known that the temperature effect greatly influences the construction control of the long-span cable-stayed bridge. The feasible proposal is put forward to the construction and measure of the long-span cable-stayed bridge by considering the temperature effect.