摘要
为指导寒冷地区钢箱梁桥的设计,以主跨436m的钢箱梁斜拉桥——辽河特大桥为研究对象,对其扁平钢箱梁进行了为期8个月的温度监测,采用对比分析、极值分析、概率统计等方法分析钢箱梁跨中截面温度及纵向应力日变化趋势、总体变化规律及温度对纵向应力的影响情况。结果表明：环境温度在20~45℃时,桥梁设计规范计算得到的钢箱梁顶板温度最大值小于实际监测值;钢箱梁连续24h温度变化服从正弦曲线分布,纵向应力每天前6h变化服从线性分布,后18h服从高斯曲线分布;24h内温度极值点时的温度效应为其它活荷载总效应的5.7~6.5倍;顶板冬季最冷月平均纵向应力相比夏季最热月低12~35 MPa,底板冬季最冷月平均纵向应力相比夏季低12~16 MPa。
To direct the design of steel box girder bridge in cold areas, the Liaohe River Bridge, a steel box girder cable-stayed bridge with a main span of 436 m, was taken as the study background, the flat steel box girder of which experienced temperature monitoring lasting 8 months. A series of analytical methods, including contrastive analysis, ultimate value analysis and probabilistic computing were adopted to analyze the trend of daily variation of midspan cross-sec- tion temperature and longitudinal stress of steel box girder as well as the general variation law and the effect of temperature on longitudinal stress. The results of the analysis indicate that the maxi- mum value of the top plate temperature of steel box girder calculated in accordance with the bridge design specification is less than the actual measured value when the ambient temperature is around 20~45℃. The 24 h continuous temperature variation of the steel box girder conforms to the sinu- soidal distribution, the first 6 h variation of longitudinal stress in each day complies with linear distribution and the following 18 h longitudinal stress variation obeys Gaussian distribution. The temperature effect at the ultimate points during 24 h is 5.7~6.5 times of the total effect of other live loads. The mean top plate longitudinal stress in the coldest winter month is 12 ~ 35 MPa lower than that in the hottest summer month, whereas the mean bottom plate longitudinal stress in the coldest winter month is 12--16 MPa lower than that in the hottest summer month.
出处
《世界桥梁》
北大核心
2015年第3期63-68,共6页
World Bridges
基金
辽宁省交通科研重点项目(201204)
关键词
桥梁工程
寒冷地区
扁平钢箱梁
温度效应
应力
数值分析
bridge engineering
cold area
flat steel box girder
temperature effect
stress
numerical analysis
