The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was investigated.The difference of creep coefficients calculat...The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was investigated.The difference of creep coefficients calculated with two Chinese codes was discussed.Based on the calculations,the pre-camber of a pre-stressed concrete continuous rigid-frame box bridge was computed for construction control purpose.The results show that the short-term creep coefficient and long-term creep coefficient calculated with the CC-1985 are larger than those calculated with the CC-2004,while the medium-term creep coefficient calculated with the CC-1985 is smaller than that calculated with the CC-2004.The difference of creep deformation calculated with these two codes is small,and the influences of concrete creep on the pre-camber for most of the segments are negligible.The deflections and stresses of the box girder measured during the construction stages agree very well with the predictions.展开更多
以某一级公路工程双幅连续刚构主桥为研究案例,采用有限元方法分析了恒载、预应力、挂篮变形、收缩徐变和活载对主梁挠度的影响,并对比了多项式、Gaussian函数、Sum of Sine函数、傅里叶函数对成桥预拱度的拟合效果。结果表明:除恒载外...以某一级公路工程双幅连续刚构主桥为研究案例,采用有限元方法分析了恒载、预应力、挂篮变形、收缩徐变和活载对主梁挠度的影响,并对比了多项式、Gaussian函数、Sum of Sine函数、傅里叶函数对成桥预拱度的拟合效果。结果表明:除恒载外,收缩徐变引起的主梁下挠占比较大;傅里叶函数对成桥预拱度的拟合效果仅次于8次多项式函数,可通过较低的计算成本得到较高的拟合进度。展开更多
基金Project(2008047B) supported by the Funds for Youth of Control South University of Forestry and Technology
文摘The effect of concrete creep on the pre-camber of a long-span pre-stressed concrete continuous rigid-frame bridge constructed by cantilever casting method was investigated.The difference of creep coefficients calculated with two Chinese codes was discussed.Based on the calculations,the pre-camber of a pre-stressed concrete continuous rigid-frame box bridge was computed for construction control purpose.The results show that the short-term creep coefficient and long-term creep coefficient calculated with the CC-1985 are larger than those calculated with the CC-2004,while the medium-term creep coefficient calculated with the CC-1985 is smaller than that calculated with the CC-2004.The difference of creep deformation calculated with these two codes is small,and the influences of concrete creep on the pre-camber for most of the segments are negligible.The deflections and stresses of the box girder measured during the construction stages agree very well with the predictions.
文摘以某一级公路工程双幅连续刚构主桥为研究案例,采用有限元方法分析了恒载、预应力、挂篮变形、收缩徐变和活载对主梁挠度的影响,并对比了多项式、Gaussian函数、Sum of Sine函数、傅里叶函数对成桥预拱度的拟合效果。结果表明:除恒载外,收缩徐变引起的主梁下挠占比较大;傅里叶函数对成桥预拱度的拟合效果仅次于8次多项式函数,可通过较低的计算成本得到较高的拟合进度。
