基于挠度的预应力连续钢梁预应力筋应力增量分析  

Stress Increment Analysis of Prestressed Steel Bar in Prestressed Continuous Steel Girder Based on Its Deflection

作　　者：贾艳敏[1] 魏皓天 王宇琪[1] 王佳伟 JIA Yanmin;WEI Haotian;WANG Yuqi;WANG Jiawei(Civil Engineering School,Northeast Forestry University,Harbin Heilongjiang 150040,China;Research and Development Center ofHighway Maintenance Technology,Liaoning Provincial Traffic Planning and Design Institute,Shenyang Liaoning 110101,China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]辽宁省交通规划设计院有限责任公司公路养护技术研究中心,辽宁沈阳110101

出　　处：《铁道建筑》2019年第2期70-73,共4页Railway Engineering

基　　金：辽宁省交通重点科技项目(201512;201513)

摘　　要：为研究预应力连续钢梁预应力筋应力增量与跨中挠度的关系和影响因素,对总长10 m的开口等截面三跨预应力连续钢梁模型进行了静力试验,并采用有限元软件ANSYS建立了该试验梁的数值模型。研究结果表明,预应力连续钢梁预应力筋应力增量与边跨及中跨跨中挠度均呈线性关系。在此基础上,分析了预应力值和边中跨比对预应力筋应力增量的影响,建立了基于预应力连续钢梁跨中挠度的预应力筋应力增量求解公式,并利用试验结果验证了求解公式的准确性。In order to study the relationship between stress increment and mid-span deflection of prestressed continuous steel girder and its influence factors,the static test on the model of three-span prestressed continuous steel girder with a total length of 10 m was carried out,and the numerical model of the girder was established by finite element software ANSYS.The research results indicate that the stress increment of prestressed steel bar is linear with the mid-span deflection of every span.On this basis,the influences of prestress value and span ratio on stress increment were analyzed,then the formula for calculating the stress increment of prestressed steel bar based on the mid-span deflection of prestressed continuous steel girder was established,and the accuracy of the formula was verified by the test results.

关 键 词：预应力连续钢梁 应力增量 模型试验 挠度 预应力值 跨径比 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]