预应力混凝土桥梁徐变计算方法对比分析  

Comparison and Analysis of Calculation Methods for Creep of Prestressed Concrete Bridges

作　　者：李恩良[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司桥梁处,天津300142

出　　处：《世界桥梁》2011年第6期54-57,共4页World Bridges

摘　　要：为了解现行规范对跨度大于96m的预应力混凝土桥徐变计算的适用性,通过试验并结合工程实例对CEB-FIP(1990)规范、《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)(简称中交04规范)、《铁路桥涵钢筋混凝土和预应力混凝土结构设计规范》(TB 10002.3-2005)(简称中铁05规范)计算的徐变进行对比分析。结果表明:按照上述3种规范计算的徐变系数依次增大,但中交04规范与CEB-FIP(1990)规范的计算值比较接近;从总体趋势来看,中交04规范的计算值更接近实测值且是偏安全的,中铁05规范的计算值偏于保守;对于跨度大于96m的预应力混凝土桥,建议采用中交04规范计算徐变较合理。To have an understanding of applicability of the creep calculations in the current codes for prestressed concrete bridges with span length greater than 96 m,the creep calculations in the CEB-FIP（1990）,Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts（JTG D62-2004） and Code for Design on Reinforced Concrete and Prestressed Concrete Structure of Railway Bridge and Culvert（TB 10002.3-2005） are compared and analyzed on the basis of testing and with reference to practical engineering examples.The results of the comparison and analysis show that the creep coefficients calculated according to the above mentioned three codes become greater and greater in the order of the codes.However,the calculated values of the creep in the JTG D62-2004 are quite close to those of the CEB-FIP（1990） and in general,the values in the JTG D62-2004 are still closer to the measured vales and are safe.The calculated values of the creep in the TB 10002.3-2005 are slightly conservative and for prestressed concrete bridges with span length greater than 96 m,it is hence considered that the utilization of the values in the JTG D62-2004 will be more rational.

关 键 词：预应力混凝土桥 徐变 徐变系数 计算方法 试验 分析 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]