外贴FRP加固预应力混凝土梁正常使用极限状态研究

对外贴FRP加固预应力混凝土桥梁正常使用极限状态的抗裂和变形性能进行初步研究。在线弹性混凝土本构模型假定的基础上,推导考虑纤维预张应力影响的性能指标计算公式,并分析纤维预张应力对正常使用极限状态性能指标的加固意义。在此基础上,分析线弹性混凝土本构假定的模型误差及性能指标对非线性混凝土本构模型的参数敏感性,进而提出相应的修正计算方法。

Study of Prestressed Concrete Girders Strengthened with Externally Bonded FRP in Serviceability Limit State

This paper conducts a preliminary study of crack resistance and deformation behavior of prestressed concrete girders strengthened with externally bonded FRP in serviceability limit state.On the basis of assumptions of linear elastic concrete constitutive model,the paper deduces the equations for performance indices of the girders in which the effect of fiber prestressing is considered,analyzes the significance of strengthening of the fiber prestressing to the performance indices in the serviceability limit state and further analyzes the errors of the assumptions of the linear elastic concrete constitutive model,the sensitivity of the performance indices to the non-linear concrete constitutive model,and also gives the calculation methods for the corresponding modifications.