本文選題：橋梁工程　切入點(diǎn)：“上”形鋼-混凝土組合梁　出處：《交通運(yùn)輸工程學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：以青海省海黃大橋?yàn)楣こ瘫尘?建立了考慮氣象參數(shù)的組合梁溫度場(chǎng)有限元分析模型,采用實(shí)橋測(cè)試數(shù)據(jù)對(duì)模型進(jìn)行了驗(yàn)證;分析了"上"形組合梁四季豎向溫度分布,給出了升溫和降溫時(shí)豎向溫度梯度簡(jiǎn)化模式,研究了太陽(yáng)輻射強(qiáng)度、氣溫和風(fēng)速等氣象參數(shù)對(duì)溫差的影響規(guī)律,采用極值統(tǒng)計(jì)方法給出了50年一遇氣象參數(shù)代表值下不同瀝青混凝土鋪裝厚度的"上"形組合梁最不利豎向溫度梯度模式。研究結(jié)果表明:在日照升溫和夜間降溫過程中,組合梁豎向溫度梯度模式不同;升溫過程中最大溫差出現(xiàn)在14:00,溫度梯度模式可簡(jiǎn)化為"頂部5次拋物線"加"底部折線"的形式,頂部溫差受瀝青混凝土鋪裝厚度影響較大,當(dāng)鋪裝厚度分別為0、50、100、150mm時(shí),頂部溫差極大值分別為23.8℃、31.7℃、24.1℃、17.4℃,底部溫差極大值可取5.1℃;降溫過程中最大溫差出現(xiàn)在2:00,溫度梯度模式可簡(jiǎn)化為"頂部雙折線"與"底部等溫段"的形式,頂部溫差受瀝青混凝土鋪裝厚度影響較大,當(dāng)鋪裝厚度分別為0、50、100、150mm時(shí),頂部溫差極小值分別為-12.2℃、-8.2℃、-5.0℃、-2.9℃,底部溫差極小值可取-16.4℃;"上"形組合梁豎向溫度梯度受氣象參數(shù)的影響,溫度與太陽(yáng)日輻射總量和氣溫基本呈線性關(guān)系,而與風(fēng)速表現(xiàn)出非線性關(guān)系;"上"形組合梁升溫梯度模式與美國(guó)AASHTO規(guī)范接近,但頂部溫差取值較美國(guó)AASHTO規(guī)范高1.7℃,降溫梯度模式與歐洲規(guī)范接近,但底部溫差較歐洲規(guī)范低8.4℃,故本文給出的溫度梯度模式更為不利。
[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，

本文編號(hào)：1589586