城市建筑2024，Vol.21Issue(12)：210-212,3.DOI:10.19892/j.cnki.csjz.2024.12.51
简支预应力混凝土箱梁的收缩徐变效应研究
Research on the Shrinkage and Creep Effects of Simply Supported Prestressed Concrete Box Beams
摘要
Abstract
The finite element method was used to study the relationship between shrinkage strain,creep strain,and the age of a 60m simply supported prestressed concrete box girder.Additionally,the effects of shrinkage and creep on the vertical deformation of the box girder,as well as the impact of prestress loss caused by shrinkage and creep on its vertical deformation,were also examined.The research findings indicate that within a period of 100 days from the end of pouring until the specified age,both shrinkage and creep strains exhibit a linear and rapid growth trend with the increase of the age.However,after surpassing the 100-day mark,the rate of strain increase gradually slows down.In the time span ranging from the end of concrete pouring to an age of 25 days,the creep deformation demonstrates linear and rapid growth with increasing age.As the age of the concrete continues to progress,the rate of creep deformation growth decelerates.Furthermore,during the period of 140 days following the completion of concrete pouring,the prestress loss resulting from shrinkage and creep effects induces a maximum deflection of the main beam at 2.3mm.Subsequently,when the age reaches 1000 days,the main beam exhibits a maximum deflection of 4.0mm.关键词
桥梁工程/预应力混凝土/预制箱梁/收缩效应/徐变效应Key words
bridge engineering/prestressed concrete/precast box girder/shrinkage effect/creep effect分类
建筑与水利引用本文复制引用
孙贯拓,赵呈涛..简支预应力混凝土箱梁的收缩徐变效应研究[J].城市建筑,2024,21(12):210-212,3.基金项目
浙江省自然科学基金项目(LY24E080010) （LY24E080010）
宁波市交通科技项目(202104) （202104）
