| 摘要: |
| 为了研究纤维格栅增强机场水泥混凝土双层道面层间黏结性能，采用室内水泥混凝土双层小梁试件模拟机场水泥混凝土双层道面，然后测试双层小梁中部截面高度方向上的应变和上、下梁底部的挠度，获得上、下梁底部的应变比和挠度差，求得双层小梁层间结合系数K.结果表明：水泥混凝土双层小梁中部截面高度方向上的应变基本呈线性分布，符合平截面假设；下层梁承受全部拉应力，上层梁主要承受压应力；双层小梁层间摩擦力引起上、下梁底部应变减少4444%~9846%；纤维格栅的加入及纤维格栅和旧水泥混凝土表面处理使双层小梁层间结合系数提高460%~1573%，上、下梁底部挠度差减少为0004~0016mm，改善了双层小梁的整体受力性能和变形性能；不同纤维格栅类型对双层小梁层间黏结性能的影响程度无差别. |
| 关键词: 纤维格栅 机场水泥混凝土道面 双层小梁 黏结性能 挠度 应变 |
| DOI：103969/j.issn1007 9629201306018 |
| 分类号: |
| 基金项目:军队科研基金资助项目(KJYZ0909，总990713) |
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| Interface Bond Property of Double Layer Airport Pavement with Fiber Grid Reinforcement |
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JIANG Le1, WENG Xing zhong1, YAN Xiang cheng1, LIU Jun zhong1, WAN Xi cun2, ZHANG Guang xian1
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1.School of Aeronautics and Astronautics Engineering, Air Force Engineering University, Xian 710038, China;2.Air Force Design Institute of Beijing, Beijing 100022, China
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| Abstract: |
| In order to study the interface bond property of cement concrete double layer airport pavement with fiber grid reinforcement, the cement concrete double layer beam specimen was used to simulate cement concrete double layer airport pavement. The strains along the depth at central section of double layer beam and the bottom deflections of upper and lower beams were tested. The bottom strain ratio and deflection difference of upper and lower beams, the coupling coefficient K of double layer beam were calculated. The results indicate that the distribution of strains is linearly along the depth at central section of double layer beam, which is coincided with the plane sections hypothesis. The lower beam bears tensile stress entirely, and the upper beam bears compressive stress mainly. The friction between upper and lower beams causes the bottom strains of upper and lower beams reduce 4444%9846%. Reinforcing with fiber grid and processing fiber gird and old cement concrete surface not only increase the coupling coefficient at the range of 460%1573% but also decrease the bottom deflection difference the number of which ranges from 0004 mm to 0016 mm, thus improve the integral force performance and deformation ability of double layer beam. The effects of fiber grid types on the interface bond properties of double layer beam have no difference. |
| Key words: fiber grid cement concrete airport pavement double layer beam bond property deflection strain |
