大跨高墩曲线刚构桥日照温度效应参数敏感性研究

Study on Parameter Sensitivity of Sunlight Temperature Effect of the Long-Span Curved Rigid-Frame Bridge with High Piers

为探究大跨径高墩曲线刚构桥日照温度效应参数敏感性,本文以贵州某大跨曲线刚构桥为研究背景,对比分析了混凝土辐射吸收率、箱梁翼缘板宽度、支座刚度及墩高四个参数对大跨高墩曲线刚构桥日照温度效应的影响规律。研究结果表明:日照温度效应下,混凝土辐射吸收率越高,对结构应力的影响效应越大;翼缘板宽度除特定时刻外可忽略其对结构的影响;支座刚度越大,墩顶与梁底之间相对位移越小;墩顶位移增长速率与墩高成正相关关系。

For investigating the parameter sensitivity of the sunlight temperature effect of long-span curved rigid-frame bridge with high piers,a long-span curved rigid-frame bridge in Guizhou was employed as the research background,and a comparative analysis on the effects of four parameters,including concrete radiation absorption rate,box girder flange slab width,bearing stiffness and pier height on the effect of sunlight temperature on a long-span curved rigid-frame bridge with high piers was carried out.The results of the study indicated that the higher the radiation absorption rate of concrete with the effect of sunlight temperature,the greater the effect on structural stresses.Flange widths are negligible for structural effects except at certain times.The larger the bearing stiffness,the smaller the relative displacements between the pier top and the beam bottom.The increase of the displacement at the top of the pier is positively associated with the pier height.