STIFFNESS CORRECTION METHOD FOR LONG-TERM DEFLECTION CALCULATION OF STEEL-CONCRETE COMPOSITE BEAM BRIDGE

摘要：

This paper presents a model test research on longterm deflection of prestressed steel-concrete composite beams caused by creep and shrinkage effects of concrete. The model is designed based on a 20.8m length segment of a service composite beam bridge in Guangzhou (with the main span length of 50 + 70 + 60m). Geometric scale between the model and prototype is 1:8. Long-term deflection of the test model changing with the time was obtained using 300 days testing results. In addition, using the CEB-FTP (1990) criterion, effective modulus of concrete was calculated considering the effect of the concrete creep and shrinkage. Uniform the effective modulus of concrete to the modulus of steel, the value of structure stiffness changing with time can be calculated with single material theory, and establish the relationship between stiffness and deflection by introducing stiffness adjustment coefficient, then the value of deflection changing with time can be calculated.

关键词： steel and concrete composite beam long-term deflection stiffness correction method creep model test

作者: Shi-Bo Zhang Rong-Hui Wang Jun-Ping Zhang

作者单位: School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 5106 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 5106 School of Civil Engineering, Guangzhou University, Guangzhou 510006, P.R. China

会议类型: 国际会议

会议名称: 2009年土木工程结构创新与可持续发展国际会议(The International Symposium on Innovation & Sustainability of Structures in Civil Engineering)

会议地点: 广州

会议语种:英文

页码: 1272-1277

在线出版日期: 2009-11-28（万方平台首次上网日期，不代表论文的发表时间）