郑州大学学报（工学版）2019，Vol.40Issue(3)：68-72,5.DOI:10.13705/j.issn.1671-6833.2018.06.006
陕西省连续箱梁桥底板实测竖向温度梯度研究
Study on Bottom Plate Measured Vertical Temperature Gradient of Continuous Box Beam Bridge in Shaanxi Province
摘要
Abstract
In order to establish the measured temperature gradient field of continuous box girder bridges in dif-ferent areas of Shaanxi Province, three representative continuous girder bridges in northern Shaanxi, central Shaanxi and southern Shaanxi were selected for one year continuous observation. By fitting the measured tem-perature data, three temperature gradient models were established. The results showed that the vertical maxi-mum temperature difference of continuous box girder bridge in three areas in Shaanxi Province was different. According to the specifications set concrete pavement, the maximum temperature of northern region was 18.6 ℃; the maximum temperature of central Shaanxi was 21.2 ℃; the maximum temperature of southern Shaanxi was 22.9℃, but were less than the standard value of 25℃. Different from the normative provisions, the measured data show that there was vertical temperature difference in the bottom plate of the box girder, the maximum positive and negative temperature differences of the bottom plate in the three regions were 3.5 ℃(-3.1 ℃) , 2.8 ℃ (-2.9 ℃) and 1.5 ℃ (-1.5 ℃) . Based on the measured temperature gradient, the finite element model of the box girder closure section was established, and the measured temperature effect was analysed. The results showed that in the negative temperature gradient, not taking into account the effect of vertical temperature gradient of the bottom plate, the force would have a negative impact for bottom plate, im-partial security. It was suggested that the vertical temperature gradient of the bottom plate should be considered comprehensively in the design checking of continuous ( rigid frame) box girder bridge.关键词
桥梁工程/连续箱梁桥/有限元模型/底板温度梯度/温度效应Key words
bridge engineering/continuous box girder bridge/finite element model/bottom plate temperature gradient/temperature effect分类
交通工程引用本文复制引用
邬晓光,贺攀,何启龙,冯宇..陕西省连续箱梁桥底板实测竖向温度梯度研究[J].郑州大学学报（工学版）,2019,40(3):68-72,5.基金项目
陕西省交通运输厅科技项目( 13-25K) （ 13-25K）
