折线先张预应力混凝土简支梁徐变挠度试验研究  

Experimental study on creep deformation of fold-line pre-tension pre-stressed simple supported beam

作　　者：刘立新[1] 赵静超[1] 王俊[1,2] 

机构地区：[1]郑州大学土木工程学院,郑州450002 [2]许昌学院,许昌461000

出　　处：《建筑结构》2009年第S2期117-120,共4页Building Structure

基　　金：国家自然科学基金(50578148);河南省交通厅项目(2005P338)资助课题

摘　　要：通过观测3根配500MPa钢筋折线先张预应力混凝土简支梁在长期荷载作用下的跨中挠度,对徐变挠度、徐变挠度系数等时随特征参数进行分析,得出了该类梁在不同工作环境下徐变系数的时程关系表达式。并用常用的徐变计算模式(ACI209R-92、CEB-FIP MC90及GL2000)及本文拟合公式对本试验的计算结果进行了对比分析,对该类梁在设计时徐变系数的选取及预拱度的设置有较高的参考价值。Based on the deflection observed data of three fold-line pre-tension pre-stressed simple supported beams under long-term loads with 500MPa high strength steel bars,characteristic parameter based on time such as creep deflection, creep deflection coefficient is analyzed,and the formulas of creep deflection coefficient for the beam of this type in different working environment are suggested.The commonly used computing model creep(ACI209R-92,CEB-FIP MC90 and GL2000) and the result calculated by the formulas are contrasted and analyzed,and this may be have high reference value for the creep coefficient selection and pre-camber settings of the beam of this type.

关 键 词：折线先张预应力梁 挠度 徐变挠度系数 徐变终值 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]