EXPERIMENTAL STUDY ON MECHANICAL BEHAVIOR OF GFRP RIBS REINFORCED COMPOSITE SANDWICH BEAMS WITH DIFFERENT SHEAR SPAN-TO-DEPTH RATIOS

Abstract

Abstract: The mechanical behavior of GFRP ribs reinforced composite sandwich beams with different shear span-to-depth ratios (a/d) was explored according to four point bending tests. The load-deflection and the typical failure modes and the effect of the a/d ratios and the thickness of the GFRP ribs on the mechanism of GFRP ribs reinforced composite sandwich beams were observed. Test results indicate that specimens with a/d ratio of 1 show the highest load bearing capacity, and it decreases as the a/d ratios increase. And the ductility properties and the strength-to-weight ratio also decrease as the a/d ratios increase. Beams failed in skin indentation failure/core shear failure when the a/d ratio less than is 3, while beams failed in top skin compressive failure as the a/d ratio larger than 3. The GFRP ribs can improve the ultimate bearing capacity and the ductility properties of sandwich beams, the greater the thickness is, the more obvious the effect.

Key words: shear span-to-depth ratios, FRP ribs, sandwich beam, ductility properties, load bearing capacity, composites

CLC Number:

TB332

ZHAO Xu-dong, CHEN Xun, ZHANG Fu-bin. EXPERIMENTAL STUDY ON MECHANICAL BEHAVIOR OF GFRP RIBS REINFORCED COMPOSITE SANDWICH BEAMS WITH DIFFERENT SHEAR SPAN-TO-DEPTH RATIOS[J]. Composites Science and Engineering, 2020, 0(8): 58-63.

References

[1] 张富宾, 刘伟庆, 方海, 等. GFRP面板-冷弯薄壁型钢组合梁受弯性能试验研究[J]. 建筑结构学报, 2018, 39(9): 104-111.
[2] 叶列平, 冯鹏. FRP在工程结构中的应用与发展[J]. 土木工程学报, 2006, 39(3): 24-36.
[3] 滕锦光. 新材料组合结构[J]. 土木工程学报, 2018, 51(12): 1-12.
[4] YALKIN H E, ICTEN B M, ALPYILDIZ T. Enhanced mechanical performance of foam core sandwich composites with through the thickness reinforced core[J]. Composites Part B: Engineering, 2015, 79: 383-391.
[5] LIU W Q, ZHANG F B, WANG L, et al. Flexural performance of sandwich beams with lattice ribs and a functionally multilayered foam core[J]. Composite Structures, 2016, 152: 704-711.
[6] 方海, 刘伟庆, 万里. 点阵增强型复合材料夹层结构制备与力学性能[J]. 建筑材料学报, 2008, 11(4): 495-499.
[7] FAM A, SHARAF T. Flexural performance of sandwich panels comprising polyurethane core and GFRP skins and ribs of various configurations[J]. Composite Structures, 2011, 92: 2927-2935.
[8] 刘子健, 刘伟庆, 万里, 等. 双向纤维腹板增强夹层结构的弯曲性能[J]. 材料科学与工程学报, 2012, 30(5): 761-765.
[9] 张富宾, 刘伟庆, 王慧, 等. 横向腹板增强复合材料夹层梁受弯性能研究[J]. 玻璃钢/复合材料, 2018(5): 53-57.
[10] WANG L, LIU W Q, FANG H. Behavior of sandwich wall panels with GFRP face sheets and a foam-GFRP web core loaded under four-point bending[J]. Journal of composite materials, 2014, 49(22): 2765-2778.
[11] 王慧, 齐玉军, 刘伟庆. 横隔板增强型复合材料梁抗剪性能试验研究[J]. 玻璃钢/复合材料, 2014(12): 91-96.
[12] 孙运楼, 王慧, 齐玉军. 隔板方向对泡沫芯复材夹芯梁抗剪性能影响的试验研究[J]. 玻璃钢/复合材料, 2016(10): 11-14.
[13] MANALO A C. Behavior of fiber composite sandwich structures under short and asymmetrical beam shear tests[J]. Composite Structures, 2013, 99: 339-349.
[14] MANALO A C, ARAVINTHAN T, KARUNASENA W. Shear behavior of glued structural fiber composite sandwich beams[J]. Construction and Building Materials, 2013, 47: 1317-1327.
[15] FERDOUS W, MANALO A, ARAVINTHAN T. Effect of beam orientation on the static behavior of phenolic core sandwich composites with different shear span-to-depth ratios[J]. Composite Structures, 2017, 168: 292-304.
[16] Standard test method for flexural properties of sandwich constructions: ASTM C393[S]. 2000.