FRP筋混凝土梁拉伸刚化效应模型研究

doi:10.19936/j.cnki.2096-8000.20220228.002

摘要/Abstract

摘要： 纤维增强聚合物(FRP)筋混凝土梁比传统钢筋混凝土梁表现出更大的挠度和更宽的裂缝。裂缝间混凝土承担拉力引起的拉伸刚化效应对FRP筋混凝土梁开裂后的变形行为有显著影响。本文通过在素混凝土受拉应力-应变关系中引入减弱系数,提出能反映拉伸刚化效应的新本构关系。建立有限元模型,获得与实验结果一致的变形响应行为,通过减弱系数评价了配筋率、混凝土强度、FRP筋弹性模量、混凝土中摻入纤维等对拉伸刚化效应的影响。随着配筋率和FRP筋弹性模量增大,减弱系数增大,拉伸刚化效应减弱;而增大混凝土强度或在混凝土中掺入纤维,减弱系数减小,拉伸刚化效应增强。结果表明该模型能够有效描述FRP筋混凝土梁的变形行为。

关键词: FRP筋, 混凝土梁, 拉伸刚化, 有限元

Abstract: Fiber reinforced polymer (FRP) reinforced concrete beams exhibit greater deflection and wider cracks than traditional reinforced concrete beams. The tension stiffening effect caused by the tensile force of the concrete between cracks has a significant impact on the deformation behavior of FRP reinforced concrete beams after cracking. This paper proposes a new constitutive relationship by introducing a weakening factor on the basis of the tensile stress-strain relationship of plain concrete, which reflects the effect of tension stiffening. The deformation behaviors of finite element simulation are consistent with the experimental results. The influence of the reinforcement ratio, concrete strength, elastic modulus of FRP bars, and concrete mixed with fibers on the tension stiffening effect was evaluated by the weakening coefficient. With the increase of reinforcement ratio and elastic modulus of FRP bars, the weakening coefficient increases and the tension stiffening effect decreases. With the increase of concrete strength or the incorporation of fiber into concrete, the weakening coefficient decreases and the tension stiffening effect increases. It indicated that the model can effectively predicate the deformation behavior of FRP reinforced concrete beams.

Key words: FRP bars, concrete beams, tension stiffening, finite element

中图分类号:

TB332

陈国雄, 安茹, 符师桦. FRP筋混凝土梁拉伸刚化效应模型研究[J]. 复合材料科学与工程, 2022, 0(2): 11-18.

CHEN Guo-xiong, AN Ru, FU Shi-hua. Modeling investigation of tension stiffening effect in FRP reinforced concrete beams[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(2): 11-18.

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