摘要
为研究不同剪力键条件下GFRP-混凝土空心箱型组合板的受力性能,进行了4个带剪力键组合板试件的静力弯曲试验,分析了开孔间距、截面形式等参数对试件破坏机制、极限承载力的影响,并得到了不同参数影响下试件的裂缝分布规律、荷载-应变曲线、荷载-滑移曲线、跨中沿截面高度应变分布的演化规律等内容。试验结果表明:试件破坏形态为跨中截面受压区混凝土被压碎;由于界面出现滑移导致剪力键破坏,但其整体工作性能良好,表明此新型组合结构具有良好的受力性能及协同变形能力;影响组合板受弯极限承载力的关键参数在于开孔间距大小,对比不同开孔间距试件,减小开孔间距能提高试件承载力,降低界面滑移;截面形式对于试件的极限承载力没有明显的影响,T形肋与矩形肋相比可以有效降低组合结构交界面的滑移量。基于试验结果并参考现行设计规范,提出了一种带剪力键的GFRP-混凝土空心箱型组合板抗弯承载力计算方法。计算值与试验值比较表明:所提方法可以有效预测GFRP-混凝土空心箱型组合板的抗弯承载力,且具有一定的安全储备,可供工程设计参考。
In order to study the mechanical behavior of GFRP-concrete hollow box-type composite slabs with different shear connectors, the static bending test of 4 composite slab specimens with shear connector is carried out, the influences of the parameters including hole spacing and rib section shape on the failure mechanism and the ultimate bearing capacity of the specimens are analysed, and the crack distribution rule, load-strain curve, load-slip curve and evolution rule of strain distribution at midspan along section height of the specimens are obtained. The test result shows that(1) The failure mode of the specimens is the crushed concrete in the compression zone at midspan section.(2) Shear connector is broken due to the interface slippage, but its overall working performance is good, indicating that the new composite structure has good mechanical property and synergistic deformation capability.(3) The key parameter affecting the ultimate bearing capacity of the composite slab is the spacing of the hole. Comparing different spacings of the specimens, reducing the spacing of the hole can improve the bearing capacity of the specimens and reduce the interface slippage.(4) The rib section shape has no obvious influence on the ultimate bearing capacity of the specimens, and the T-shaped rib can effectively reduce the slippage of the interface of the composite structure compared with the rectangular rib. Based on the test result and referring to the current design specifications, a calculation method of the flexural capacity of GFRP-concrete hollow box-type composite slabs with shear connectors is proposed. The comparison between the calculated value and the experimental value shows that the proposed method can effectively predict the flexural capacity of GFRP-concrete hollow box-type composite slab and has a certain safety reservation for engineering design.
作者
黄海林
刘光伟
朱慧
黄曙
曾垂军
HUANG Hai-lin;LIU Guang-wei;ZHU Hui;HUANG Shu;ZENG Chui-jun(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201 ,China;Guangxi Construction Co.,Ltd.,of China Construction Fifth Engineering Bureau,Nanning Guangxi 530022,China;Civil Air Defense Engineering Quality Supervision Station of Chansha,Changsha Hunan 410043,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2019年第7期63-72,共10页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51308207)
湖南省自然科学基金青年基金项目(2018JJ3161)
关键词
桥梁工程
抗弯承载力
受弯性能试验
剪力键
GFRP-混凝土组合板
破坏机理
bridge engineering
flexural bearing capacity
flexural performance experiment
shear connector
GFRP-concrete composite slab
failure mechanism
