一座变截面连续箱梁桥简支端剪应力偏载系数分析

箱形截面近年来得到广泛应用,但建成后通过一定时间的运营,发现箱梁腹板普遍开裂,国内外进行了大量的研究与分析。通过对一座预应力混凝土变截面连续箱梁桥实例,通过空间有限元分析计算,发现简支端的最大剪应力与边跨跨中的正应力偏载系数远比经验值大,可为类似工程提供参考。

Shearing Stress Unbalance Loading Coefficient Analysis of Simple Supported End of a Variable Cross-Section Continuous Box Girder

Box-shaped cross section is applied widely in recent years,however,after certain time of operation since establishment,it is found that most box girder web plates crack,which has been researched and analyzed a lot at home and abroad.Taking a prestressed concrete variable cross-section continuous box girder bridge as an example,through spatial finite element analysis and calculation,it is found that unbalance loading coefficient of max.shearing stress of simple supported end and normal stress of side span and midspan is larger greatly than empirical value,providing references for similar engineering.