發(fā)布時間：2018-08-18 10:14

【摘要】：為指導(dǎo)寒冷地區(qū)鋼箱梁橋的設(shè)計,以主跨436m的鋼箱梁斜拉橋——遼河特大橋為研究對象,對其扁平鋼箱梁進行了為期8個月的溫度監(jiān)測,采用對比分析、極值分析、概率統(tǒng)計等方法分析鋼箱梁跨中截面溫度及縱向應(yīng)力日變化趨勢、總體變化規(guī)律及溫度對縱向應(yīng)力的影響情況。結(jié)果表明:環(huán)境溫度在20~45℃時,橋梁設(shè)計規(guī)范計算得到的鋼箱梁頂板溫度最大值小于實際監(jiān)測值;鋼箱梁連續(xù)24h溫度變化服從正弦曲線分布,縱向應(yīng)力每天前6h變化服從線性分布,后18h服從高斯曲線分布;24h內(nèi)溫度極值點時的溫度效應(yīng)為其它活荷載總效應(yīng)的5.7~6.5倍;頂板冬季最冷月平均縱向應(yīng)力相比夏季最熱月低12~35 MPa,底板冬季最冷月平均縱向應(yīng)力相比夏季低12~16 MPa。
[Abstract]:In order to guide the design of steel box girder bridge in cold area, taking the steel box girder cable-stayed bridge with main span of 436m as the research object, the temperature of the flat steel box girder is monitored for 8 months, and the comparative analysis and extreme value analysis are adopted. The trend of diurnal variation of cross section temperature and longitudinal stress of steel box girder is analyzed by means of probabilistic statistics and so on. The general variation law and the influence of temperature on longitudinal stress are also analyzed. The results show that when the ambient temperature is 20 ~ 45 鈩，

本文編號：2189156