温度效应和收缩徐变效应对小半径曲线连续刚构桥线形控制影响研究OA

In high-altitude cold environments,where the diurnal temperature variation is significant and the climate is arid,the thermal effects and creep deformations of continuous rigid-frame bridges become more pronounced.For small-radius curved continuous rigid-frame bridges constructed using cantilever casting methods,alignment control is particularly susceptible to temperature-induced deformations and creep effects.Taking the No.5 Inclined Gully Bridge on the Lehua Expressway in Ledu District,Haidong City,Qinghai Province as a case study,we established a finite element simulation model with Midas Civil to comprehensively investigate the combined effects of concrete shrinkage-creep(caused by environmental humidity fluctuations and construction interruptions)and temperature loads on girder deflection and stress distribution in small-radius curved continuous rigid-frame bridges.A comparative analysis between theo-retical predictions and field measurements during cantilever construction reveals that the theoretical align-ment closely matches measured alignment trends,with a maximum deviation of 17 mm.Additionally,stress variations at the pier-top sections show excellent agreement between theoretical values and measure-ments.These findings provide valuable insights for designing and constructing small-radius curved contin-uous rigid-frame bridges in cold and arid regions.