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针对我国桥涵设计规范未给出无铺装层PK断面混凝土梁日照梯度温度及国内外缺乏研究的现状,应用ANSYS求解了马鞍山长江公路大桥右汊斜拉桥无铺装层混凝土主梁温度场,并进行了现场实测,计算值与实测值吻合较好。对无铺装层混凝土梁日照温度场的参数分析表明,吸收率对无铺装层混凝土梁最大竖向温差影响较大,风速次之。计算得到了该桥主梁在施工过程中出现的最大竖向梯度温度及其分布的指数函数的梯度温度模式。该模式与现有各国规范的梯度温度模式比较表明,本文研究得到的无铺装层混凝土梁梯度温度分布趋势与各国规范已有相关规定的分布趋势基本吻合。但温度分布受地域影响,各国规范梯度温度取值存在差异,建议补充完善我国公路桥规中关于无铺装层混凝土梁梯度温度的规定。
In the light of the fact that the bridge and culvert design code in our country did not give the sunshine temperature gradient gradient of concrete beam without ply layer PK profile and the lack of research status at home and abroad, the temperature field of the concrete beam with no ply layer in the right footed cable-stayed bridge of Ma’anshan Changjiang River Highway Bridge was solved by ANSYS, And the field measured, the calculated value and the measured value is in good agreement. The parameter analysis of the sunshine temperature field of the unpaved concrete beam shows that the absorption rate affects the maximum vertical temperature difference of the concrete beam without pavement more and the wind velocity second. The gradient temperature model of exponential function of maximum vertical gradient temperature and distribution of the bridge girder during construction was calculated. Compared with the existing standard gradient temperature models in different countries, this model shows that the trend of the gradient temperature distribution of the unpaved concrete beams studied in this paper accords well with the distribution trends of relevant regulations in various countries. However, the temperature distribution is affected by the region. There are differences in the standard gradient temperature values in different countries. It is suggested to supplement and improve the provisions on the gradient temperature of concrete beams without pavement in China’s highway bridges and regulations.