高原高寒地区“上”形钢-混凝土组合梁的竖向温度梯度模式

发布时间：2018-03-09 17:46

  本文选题：桥梁工程　切入点：“上”形钢-混凝土组合梁　出处：《交通运输工程学报》2017年04期 　论文类型：期刊论文

【摘要】：以青海省海黄大桥为工程背景,建立了考虑气象参数的组合梁温度场有限元分析模型,采用实桥测试数据对模型进行了验证;分析了"上"形组合梁四季竖向温度分布,给出了升温和降温时竖向温度梯度简化模式,研究了太阳辐射强度、气温和风速等气象参数对温差的影响规律,采用极值统计方法给出了50年一遇气象参数代表值下不同沥青混凝土铺装厚度的"上"形组合梁最不利竖向温度梯度模式。研究结果表明:在日照升温和夜间降温过程中,组合梁竖向温度梯度模式不同;升温过程中最大温差出现在14:00,温度梯度模式可简化为"顶部5次抛物线"加"底部折线"的形式,顶部温差受沥青混凝土铺装厚度影响较大,当铺装厚度分别为0、50、100、150mm时,顶部温差极大值分别为23.8℃、31.7℃、24.1℃、17.4℃,底部温差极大值可取5.1℃;降温过程中最大温差出现在2:00,温度梯度模式可简化为"顶部双折线"与"底部等温段"的形式,顶部温差受沥青混凝土铺装厚度影响较大,当铺装厚度分别为0、50、100、150mm时,顶部温差极小值分别为-12.2℃、-8.2℃、-5.0℃、-2.9℃,底部温差极小值可取-16.4℃;"上"形组合梁竖向温度梯度受气象参数的影响,温度与太阳日辐射总量和气温基本呈线性关系,而与风速表现出非线性关系;"上"形组合梁升温梯度模式与美国AASHTO规范接近,但顶部温差取值较美国AASHTO规范高1.7℃,降温梯度模式与欧洲规范接近,但底部温差较欧洲规范低8.4℃,故本文给出的温度梯度模式更为不利。
[Abstract]:Taking Haihuang Bridge in Qinghai Province as the engineering background, the finite element analysis model of composite beam temperature field considering meteorological parameters is established, and the model is verified by real bridge test data, and the vertical temperature distribution in four seasons of "upper" composite beam is analyzed. A simplified model of vertical temperature gradient for heating and cooling is given, and the influence of meteorological parameters such as solar radiation intensity, temperature and wind speed on temperature difference is studied. The most unfavorable vertical temperature gradient model of "upper" composite beam with different thickness of asphalt concrete pavement under the representative values of meteorological parameters in 50 years is given by using the extreme value statistical method. The results show that in the process of sunshine heating and night cooling, the most adverse vertical temperature gradient model is obtained. The vertical temperature gradient model of composite beam is different, the maximum temperature difference appears in 14: 00, the temperature gradient model can be reduced to the form of "top 5 parabola" plus "bottom fold line", and the top temperature difference is greatly affected by asphalt concrete pavement thickness. When the thickness of the pavement is 150 mm, the maximum of the temperature difference at the top is 23.8 鈩，

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