波形钢腹板箱梁温度分布

Temperature Distribution of Box Girder with Corrugated Steel Webs

波形钢腹板箱梁的温度梯度是波形钢腹板箱梁桥设计的重要问题。对波形钢腹板箱梁桥开展了9个月温度实测;建立了波形钢腹板的温度场有限元二维模型;选取典型天气条件开展数值模拟,对比分析数值模拟和实桥温度测试结果,验证了温度场有限元模型的有效性;对波形钢腹板箱梁桥所处地区的昼夜温差进行数理统计,得到波形钢腹板箱梁所处地区的大气昼夜温差代表值;基于大气昼夜温差代表值分析了波形钢腹板箱梁的温度分布。分析结果显示:波形钢腹板箱梁所处地区的昼夜温差服从W(10.453,2.577)分布;对于顶板,数值模拟温度梯度和《公路桥涵设计通用规范》中对钢混组合桥梁的温度梯度形状类似,区别在于理论分析得到最大温差为20.8℃,而规范定义为25℃。

The temperature gradient of the box girder with corrugated steel webs is an important problem in the design of box girder bridges with corrugated steel webs. The temperature field test of box girder bridge with corrugated steel webs was carried out for 9 months; and a 2D finite element model of the temperature field of corrugated steel webs was established. Typical weather conditions were selected to carry out the numerical simulation. The validity of the finite element model of temperature field is verified by comparing the results of numerical simulation and real bridge temperature test. The temperature difference between day and night in the area where the corrugated steel webs box girder bridge was located was analyzed by mathematical statistics, and the representative values of atmospheric temperature difference between day and night in the area where the corrugated steel webs box girder bridge was located were obtained. The temperature distribution of box girder with corrugated steel webs was analyzed based on the representative value of atmospheric temperature difference between day and night. Research results show that： the temperature difference between day and night in the area where the corrugated steel webs box girder bridge is located obeys W （10.453, 2.577） distribution. For the roof, the temperature gradient of numerical simulation is similar to that of steel-eonerete composite bridge in General Code for Design of Highway Bridges and Culverts . The difference is that the maximum temperature difference obtained by theoretical analysis is 20.8℃ , while that of the standard is defined as 25℃.