混凝土箱梁桥腹板竖向预压应力场的研究  

Study on Vertical Prestress Field of Webs of Concrete Box Girder Bridge

作　　者：沈明燕[1] 钟新谷[1] 舒小娟[1] 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《公路交通科技》2008年第12期102-107,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金资助项目(50478099);湖南省教育厅科研资助项目(06C311)

摘　　要：基于傅立叶级数,把箱梁腹板上单根竖向预应力筋简化为作用在无限狭长矩形薄板上的一对大小相等、方向相反的集中力,推导出单筋作用下箱梁腹板预压应力的解析公式。该解析公式与ANSYS程序分析结果比较,两者的竖向压应力分布线形基本吻合,竖向预应力除了在腹板中产生呈正态分布的竖向压应力外,还在其两侧产生较小竖向拉应力,实桥试验进一步证明该解析公式适用于腹板竖向压应力叠加计算。文中最后分析了箱梁桥腹板沿高度竖向预压应力场分布特点,引入修正系数K,提出竖向预应力计算的修正公式,同时绘出不同间距竖向预应力作用下腹板的μ-K曲线图。Based on Furior series, an analytic formula for analyzing the prestress in the web of box girder with single bar was deduced through simplifying the action of single vertical prestressing bar as a couple of concentrated forces with equal value but opposite direction acting on a thin rectangular board with infinite length. The vertical compress stress distribution in the web gotten from the analytic solution basically agrees with that from the ANASYS finite element solution. The analysis result indicates that the vertical compress stress distribution in the webs meets the normal distribution and small tensile stresses are created aside the tendons. Field test on a real bridge also testifies that the analytic formula is adaptable to the solution of the superposition of vertical prestress in the web. Furthermore, the feature of the vertical prestressing field along the height of the web was analyzed and modifying formula was presented by introducing a compensation factor K. Besides, the μ-K curves of the webs under the action of prestressing tendons with different spacing intervals were presented.

关 键 词：桥梁工程 箱梁桥 解析公式 试验研究 竖向预应力 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]