钢箱梁与桥面铺装层温度场协同变化规律分析

Law of Cooperative Change Between Steel Box Girder and Deck Surface

为研究钢箱梁桥面铺装层温度场在环境温度条件下的变化规律,利用ABAQUS软件建立了钢箱梁及铺装层热传导分析模型。根据温度场计算理论,在考虑太阳辐射、空气对流交换以及自身有效辐射等影响因素的前提下,结合江苏省长江流域内冬夏季节的代表性环境气温变化规律,对钢箱梁及铺装层温度场进行分析。分析结果表明:铺装层温度场随着大气温度的变化呈现出周期性变化规律;夏季铺装层温度明显高于大气温度,最高温度超过了60℃;冬季铺装层的最低温度低于-4℃,对铺装层结构的高温稳定性及低温抗裂性能均提出了较高的要求;同时,钢箱梁相对封闭的结构具有明显的"保温"作用,使得铺装层夜间温度均高于环境大气温度。

In order to analyze the law of temperature field change of steel box girder （SBG） and deck surface under ambient temperature, ABAQUS was utilized to build a SBG and deck surface model for heat transfer analysis. With consideration of such influencing factors as solar radiation, air convection ex- change effect, effective radiation itself, etc., the temperature fields of SBG and deck surface under ambi- ent temperature filed in the Yangtze River valley in Jiangsu Province were analyzed combining with the typical law of ambient temperature changing in summer and winter. The results indicate that： the surface temperature periodically changes with ambient temperature; the temperature of surface is higher than ambient temperature in summer, the maximum temperature is over 60℃; the minimum temperature of surface is lower than -4℃ in winter, which proposes higher requirement on high-temperature stability and low-temperature anti-cracking performance of deck surface. Besides, the steel box girder has obvi- ous heat preservation effect, which makes the surface temperature higher than ambient temperature dur- ing night.