铁道科学与工程学报Issue(2)：330-334,5.
预应力混凝土T梁裂缝成因分析与处理
Cause analysis and treatment of cracks in prestressed concrete T beams
摘要
Abstract
With the increase of service life,Yuanshui bridge in Shichang railroad appeared different types of cracks in 32 m prestressed concrete T beams.The crack causes were analyzed from several aspects,such as the construction temperature,the strength of concrete,the mechanical performance.It is found that the main cause of longitudinal cracks along the direction of the prestressed pipe is that when the radius of curvature of pipeline reduced by 14% or the stress prestressed more than 14%,the concrete tensile stress in prestressed pipe exceeds standard tensile strength of the concrete,thereby resulting in the longitudinal cracks;The vertical diagonal cracks in the beam terminal are induced by different pretension on the upper and lower sides.The imbalance of bending moment at the upper bearing top flange bottom of T beam is therefore caused.When the difference ex-ceeds the concrete axial tensile stress,it results in the occurrence of cracks.The findings in this paper provide important technical support for future bridge strengthening.关键词
T梁/裂缝/力学分析/预应力混凝土Key words
T beams/cracks/mechanical analysis/prestressed concrete分类
交通工程引用本文复制引用
李昀..预应力混凝土T梁裂缝成因分析与处理[J].铁道科学与工程学报,2015,(2):330-334,5.基金项目
国家自然科学基金资助项目 （）
