STRESS ON THE CONTACT SURFACE CAUSED BY CREEP EFFECT OF TWICE-PRESTRESSED COMPOSITE BEAM
The creep camber of the high-speed railway bridge should be carefully considered. In the case of satisfying the mechanical performance , twice-prestressed composite beam has the advantages of reducing the creep camber and is worth popularizing. Concrete constructed by two steps of casting have different stress and concrete age due to particular construct technics, creep deformation restrict interactionally,then stress on the contact surface were caused by creep effect. This paper take age-adjusted effective modulus instead of modulus of concret, then use trigonometric progression describe stress on the contact surface,and get the stress by minimum excess principle beased on deformation compatibility. Get the distribution of the stress by a material example,these results can provide references for shear resistance design of contact surface.
Twice-prestressed composite beam Creep stress on the contact surface Minimum ezcess principle Trigonometric progression
Yun-Yao Hu Xu-Dong Shao Jian-Hui Luo
School of Civil Engineering,Hunan University,Changsha 410082,P. R.China Hunan Zhongda Design Institu School of Civil Engineering,Hunan University,Changsha 410082,P. R.China
国际会议
长沙
英文
818-825
2009-10-26（万方平台首次上网日期，不代表论文的发表时间）