寒区系杆温度场的敏感性及温度梯度

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：为系统研究高寒地区系杆拱桥结构中系杆竖向温度场分布的影响因素及温度梯度，分别选取气象、材料热工参数作为单一因素对温度场的敏感性进行有限元数值分析。根据桥位50 a的气象参数，采用统计理论确定使用年限为100 a的系杆竖向温度梯度。研究结果表明：太阳辐射强度、混凝土导热系数是系杆竖向温度梯度分布的主要影响因素，风速为次要影响因素；随太阳辐射强度减小，结构上缘温差减小；随混凝土导热系数的增大，结构上缘温差减小；基于系杆竖向温度分布模式，计算齐齐哈尔市使用年限为100 a的系杆竖向温度梯度系数T0及指数a，得到使用年限为100 a的系杆竖向温度梯度拟合曲线函数。本文所建模型计算得到的竖向温度梯度沿系杆结构竖向下降较慢。

关键词：系杆混凝土；有限元分析；温度场；敏感性分析；温度梯度

Sensitivity and temperature gradient of tie rod temperature field in cold zone

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 vertical temperature field distribution of tie rod in tied arch bridge and the value of vertical temperature gradient in alpine region, meteorological parameters and material thermal parameters as single factor are selected to numerically analyze the sensitivity of temperature field. The vertical temperature gradient parameters with service life of 100 years are determined by statistical theory based on 50 years temperature parameters. The results show that solar radiation intensity and thermal conductivity of concrete are the main factors affecting the vertical temperature gradient distribution of tie rods, and the wind speed is the minor factor. The temperature difference on the upper edge of the structure decreases as the solar radiation intensity decreases, while the temperature difference of vertical upper edge of structure decreases as the thermal conductivity of concrete increases. Based on the model of vertical temperature distribution of tie rods, the vertical temperature gradient coefficient T0 and the corresponding value of a of the 100-year service life tie rod in Qiqihar area are calculated. The fitting curve function of vertical temperature gradient of tie rod with 100year service life is obtained. The vertical temperature gradient along the tie rod structure obtained in this paper falls slowly compared with that of the specification.

Keywords:tie rod concrete; finite element analysis; temperature field; sensitivity analysis; temperature gradient