钢管混凝土拱桥徐变影响分析  

Analysis on Creep Effect of Concrete-filled Steel Tubular Arch Bridges

作　　者：李生勇[1] 李凤芹[2] 陈宝春[1] K M SHRESTHA 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]铁道第三勘察设计院集团有限公司桥梁设计处,天津300142

出　　处：《铁道学报》2011年第3期100-107,共8页Journal of the China Railway Society

基　　金：福建省教育厅科技资助项目(JA08015);福州大学博士后基金(XRC-0804);铁道第三勘察设计院集团有限公司资助项目

摘　　要：基于龄期调整有效模量法推导出钢管混凝土轴心受压构件徐变系数公式,采用该公式对钢管混凝土轴心受压构件进行徐变分析。由徐变预测结果与试验数据比较可知,在CEB-FIP 78、CEB-FIP 90及ACI 209R等3种典型徐变系数模式中,ACI 209R模式较其它两种徐变系数模式更为合理。采用ACI 209R徐变系数模式对1座跨径380 m的大跨钢管混凝土铁路拱桥进行徐变分析,并与CEB-FIP 78模式计算结果进行比较,结论可为其它钢管混凝土拱桥的徐变分析提供参考。On the Basis of the age-adjusted effective modulus method,a formula is deduced for calculating the creep coefficient of axially-compressed concrete-filled steel tubular（CFST） members.By comparison between the test results and theoretical calculation for axially compressive CFST members,it is shown that the ACI 209R mode is more rational out of the three typical concrete creep coefficient modes,CEB-FIP 78,CEB-FIP 90 and ACI 209R,in creep analysis of CFST members.The ACI 209R mode is used in analysis of creep effect of a long span deck type CFST railway arch bridge with a span of 380 m and the results are compared with calculation by CEB-FIP 78.The conclusions provide references for creep analysis of other CFST arch bridges.

关 键 词：钢管混凝土 徐变 轴心受压构件 拱桥 龄期调整有效模量法 徐变系数模式 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]