寒区桥面铺装的温度场敏感性及温度梯度
刘兴国，陶成云，黄巍
哈尔滨学院 土木建筑工程学院，黑龙江 哈尔滨 150086
摘要：为系统分析寒区桥面铺装温度场分布的影响因素及横向温度梯度的取值问题，以气象、材料热工参数、桥面宽度及铺装厚度为单一影响因素，对温度场的敏感性进行数值分析。基于桥位50 a的温度参数，采用统计理论确定不同使用年限桥面的横向温度梯度参数。研究表明：太阳辐射强度主要影响桥面横向温度分布，风速主要影响桥面横向温差，温差变化量约占最大温差的34.8%，在宽桥中应考虑桥面横向温差；沥青混凝土铺装层的临界厚度约为5 cm，当厚度大于5 cm时，随厚度的增大，系杆上表面的最高温度及竖向温差均明显降低，铺装层厚度由5 cm分别增至10、15 cm时，系杆顶缘温差由17.4 ℃分别减至12.1、9.8 ℃；沿桥面横向温度梯度是以桥面中线为对称的指数曲线模式，该地区桥面横向升温梯度拟合曲线函数为Tx=3.42e-0.28x。
关键词：桥面铺装；温度场；敏感性分析；温度梯度
Temperature field sensitivity and temperature gradient of bridge deck pavement in cold region
LIU Xingguo, TAO Chengyun, HUANG Wei
School of Civil Engineering, Harbin University, Harbin 150086, China
Abstract:In order to systematically analyze the influencing factors of temperature field distribution of bridge deck pavement and the value of transverse temperature gradient in alpine region, meteorological parameters, material thermal parameters and bridge deck width and pavement thickness as single influence factors to the sensitivity of temperature field is numerically analyzed. Based on the meteorological parameters of the bridge site for 50 years, the transverse temperature gradient parameters of different service life are determined by using statistical theory. The results show that, the solar radiation intensity mainly affects the transverse temperature distribution of the bridge deck, while the wind speed mainly affects the transverse temperature difference of the bridge deck, and the variation of the temperature difference accounts for about 34.8% of the maximum temperature difference. The transverse temperature difference of the bridge deck should be considered in the wide bridge. The critical thickness of asphalt concrete pavement layer is about 5 cm. When the thickness is greater than this value, the maximum temperature and vertical temperature difference on the upper surface of tie rod decrease obviously with the increase of thickness. When the thickness of pavement layer increases from 5 cm to 10 cm and 15 cm, the maximum temperature on the upper surface of tie rod decreases from 17.4 ℃ to 12.1 ℃ and 9.8 ℃. The transverse temperature gradient along the bridge deck is a power exponential curve model with the bridge deck centerline as symmetry, the fitting curve function of the transverse temperature gradient of the bridge deck in this area is Tx=3.42e-0.28x.
Keywords:bridge deck pavement; temperature field; sensitivity analysis; temperature gradient
