玻璃钢/复合材料 ›› 2009, Vol. 205 ›› Issue (6): 5-11.

• 基础研究 • 上一篇    下一篇

加固混凝土梁的GFRP板抗拉强度与界面切应力

戈晓霞1,张东焕1,王利民1,2  本文作者还有何敏和任鹏   

  1. 1.山东理工大学交通与车辆工程学院力学部,山东淄博255049 |2青岛理工大学理学院,山东青岛266033
  • 出版日期:2009-11-28 发布日期:2009-06-25
  • 作者简介:戈晓霞(1983-),女,硕士研究生,主要从事材料与结构的失效研究。
  • 基金资助:

    国家自然科学基金(10272068)|山东省自然科学基金(Y2006A29)


TENSION STRENGTH AND SHEAR STRESS DISTRIBUTION OF GFRP STRENGTHENING CONCRETE BEAM

  • Online:2009-11-28 Published:2009-06-25

摘要:

为了研究玻璃纤维布的拉伸强度,通过5个涂浸渍胶和未涂胶的试件进行了轴向拉伸实验。结果表明,环氧

树脂不仅有粘贴和保护玻璃纤维布的作用,而且能够提高其拉伸强度。为进一步分析玻璃纤维强化塑料(GFRP)板对

加固结构的影响,特制备9个单层GFRP板加固混凝土梁试件,对其进行四点弯曲加载实验,并在其中一个试件的

GFRP表面粘贴了应变片,进行电测跟踪测试,从而得到结构损伤破坏过程曲线和应变片粘贴处的应变值。对比两种

实验得知,GFRP板轴向拉伸强度比四点弯曲实验得到的强度大。又由测试数据和力学模型,得到FRP板轴力以及与

混凝土间界面上的切应力分布曲线。

关键词: 混凝土梁, 玻璃纤维强化板(GFRP), 拉伸强度, 电测, 切应力分布

Abstract:

To investigate the tension strength of glass fiber, axial tension experiments were

carried out for five specimens with or without impregnating compounds. The experiments indicated

that the epoxy resin could not only stick and protect glass fiber plates, but also increase its

tensile strength. To deeply understand mechanical behavior of GFRP strengthening concrete structure

, nine specimens were tested by beams′ fourpoint bending experiments. One of the specimens was

stick with strain gauges for tracking the failure process. Then, the damage process curves of the

experiments and strain values were obtained. Comparison with two kinds of experiments, axial

tension strength of glass fiber plates was greater than the strength of fourpoint bending test.

Through the test data of concrete beam with GFRP and mechanics model analysis, the axis force and

shear stress distribution of GFRP were analyzed respectively.

Key words:  concrete beam, GFRP plates, tension strength, electrical measurement, shear stress distribution

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