有黏结预应力CFRP筋混凝土梁试验及非线性分析

通过6根梁试件的单调加载静力试验,对有黏结预应力CFRP筋混凝土梁的受力过程、破坏形态、抗弯承载力、位移延性以及变形特性等进行了较系统的研究,并利用ANSYS软件对试验梁进行了非线性有限元分析。研究结果表明:有黏结预应力CFRP筋混凝土梁受力性能良好,具有较大的位移延性和变形能力;按配筋率的不同,梁试件的破坏模式分为受拉破坏和受压破坏2种;随着配筋率的增大和张拉控制应力的提高,有黏结预应力CFRP筋混凝土梁的位移延性有所降低;和非预应力配筋为钢筋的梁试件相比,非预应力配筋为玻璃纤维塑料(GFRP)筋的梁试件的位移延性和变形能力稍低;典型试件的有限元计算值和试验值吻合良好。

Experiment and Nonlinear Analysis of Concrete Beams with Bonded Prestressing CFRP Tendons

Authors presented experimental studies on six concrete beams with bonded prestressing CFRP tendons under static monotonous loads.On the basis of tests,loading process,failure patterns,flexural bearing capacity,displacement ductility as well as deformation characteristic of specimen beams were studied in detail.In addition,nonlinear FEM analysis on specimen beams was achieved by ANSYS software.Study results show that concrete beams with bonded prestressing CFRP tendons have relatively high displacement ductility and large deformation capacity.According to different reinforcement ratios,failure modes of specimens could be divided into two types,tensile failure and compressive failure.With the increase of reinforcement ratios or stretching control stresses of CFRP tendons,displacement ductility of beams decreases to some extent.Both the displacement ductility and deformation capacity of specimen beams with GFRP bars as reinforcing bars are a little lower than those of specimens with steel bars.FEM calculation values of typical specimen agree well with its test values.