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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

38卷

期数:

2021年02期

页码:

79-89

栏目:

出版日期:

2021-03-25

文章信息/Info

Title:

Experiment on Flexural Behavior of GFRP Profile-concrete Composite Beams

文章编号:

1673-2049(2021)02-0079-11

作者:

黄海林^1,2,周福林¹,言 兴¹,李 遨¹,黄 曙³

1. 湖南科技大学 土木工程学院,湖南 湘潭 411201; 2. 湖南科技大学 结构抗风与振动控制湖南省重点实验室, 湖南 湘潭 411201; 3. 长沙市人防工程服务中心,湖南 长沙 410013

Author(s):

HUANG Hai-lin^1,2, ZHOU Fu-lin¹, YAN Xing¹, LI Ao¹, HUANG Shu³

1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China; 2. Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control, Hunan University of Science and Technology, Xiangtan 4

关键词:

GFRP型材;  组合梁;  静力试验;  破坏机理;  界面滑移;  受弯承载力

Keywords:

GFRP profile;  composite beam;  static test;  failure mechanism;  interface slip;  flexural bearing capacity

分类号:

U443,TU398

DOI:

10.19815/j.jace.2020.05034

文献标志码:

A

摘要:

为了研究玻璃纤维增强复合材料(GFRP)型材-混凝土组合梁在静载作用下的受弯性能,将GFRP工字型材的上翼缘埋于混凝土板内,完成了8根GFRP型材-混凝土组合梁三分点加载受弯性能试验,得到了其破坏形态、荷载-跨中挠度曲线、荷载-应变曲线以及荷载-滑移曲线,分析了界面连接方式及型材厚度对组合梁受弯破坏机理、正截面受弯承载力及延性的影响。通过比较分析组合梁截面应变、跨中挠度、界面相对滑移的变化规律,验证了将GFRP工字型材的上翼缘置于混凝土板内作为剪力键的可行性。结果表明:接触面喷砂和GFRP型材上翼缘设置螺栓的界面连接方式可以显著降低GFRP型材与混凝土板界面间的滑移,从而提高组合梁的整体工作性能; GFRP型材厚度对试件的承载力影响不明显,但是型材厚度提高48%,其挠度降低20%左右; 所得结论可为该组合梁的理论分析与实际工程应用提供参考。

Abstract:

In order to study the flexural behavior of glass fiber reinforced polymer(GFRP)profile-concrete composite beam under static load, the upper flange of GFRP I-shaped profiles was buried in concrete slabs and the three-point loading flexural behavior test of 8 GFRP profile-concrete composite beams were completed. The crack distribution rule, load-span deflection curve, load-strain curve and load-slip curve were obtained. The influences of interface connection method and profile thickness on the bending failure mechanism, bending capacity and normal section ductility of composite beams were analyzed. By comparing and analyzing the variation rule of section strain, mid-span deflection, and interface relative slip of composite beam, the feasibility of placing the upper flange of GFRP I-shaped profile in the concrete slab as the shear connectors was verified. The results show that the interface connection methods of sand blasting on the contact surface and bolts set on the flange of the GFRP profile can significantly reduce the interface relative slip between the GFRP profile and the concrete slab, thereby improve the overall working performance of the composite beam. The thickness of the GFRP profile has no obvious effect on the bearing capacity of the specimen, but when the thickness of the profile is increased by 48%, its deflection can be reduced by about 20%. The calculation can provide a reference for the theoretical analysis and practical engineering application of the composite beam.

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相似文献/References:

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备注/Memo

备注/Memo:

收稿日期:2020-05-17
基金项目:湖南省教育厅优秀青年项目(19B188); 湖南省自然科学基金青年基金项目(2018JJ3161);
湖南建工集团基础研究项目(JGJTK-2018003)
作者简介:黄海林(1984-),男,湖南邵东人,副教授,工学博士,E-mail:hhlvsgenius@163.com。

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更新日期/Last Update: 2021-03-20