FRP部分预应力混凝土梁受力全过程数值分析

为对FRP部分预应力混凝土梁进行受力模拟分析和参数变化研究,对其现有不同可变形性指标进行对比及徐变变化研究,建立了可分析FRP有粘结或无粘结部分预应力混凝土梁全过程反应的数值计算方法,并编制了相应的计算程序。该数值分析方法是基于增量变形的混凝土受弯构件的非线性分析理论。在该数值计算过程中,有粘结非预应力筋及有粘结预应力筋可以是常规的钢筋或高强钢筋,也可以是FRP筋。与3个不同学者进行的相关试验梁的试验结果对比表明,数值计算结果与试验结果符合较好,是可行和可靠的。

Numerical Mechanical Analysis for Partial Prestressed Concrete Beams with FRP Tendons

To evaluate existing ductility and deformability indexes and to perform parameter analysis as well as creep analysis for fiber reinforced polymer(FRP) bonded partial prestressed concrete beams under loading,a numerical calculation method and program for mechanical analysis of FRP bonded or unbonded partial prestressed concrete beams were established.The numerical model is based on the incremental deformation method for evaluation of the nonlinear response of concrete flexural members.In the analysis,the nonprestressed bars and bonded prestressed tendons can be either of steel or of FRP.The numerical results were compared with some available experimental results conducted by different investigators.The results agree well with the experimental data.And it shows that the presented method is feasible and reliable.