高抗剪强度FRP型材组合梁成型工艺及试验研究

发布时间：2018-05-18 08:34

本文选题：FRP型材梁 + 二次成型工艺　；参考：《土木工程学报》2016年04期

【摘要】：纤维单向布置导致FRP拉挤型材抗剪强度极低、易在腹板发生纵向剪切破坏,为有效克服这一缺点,提出一种针对FRP拉挤型材的二次成型工艺。该工艺以FRP拉挤型材、FRP纤维布和树脂为原料;在两个FRP拉挤型材腹板间手糊中间夹层,施加法向螺栓预紧力以保证各部分共同工作。为检验二次成型FRP拉挤型材构件及FRP-混凝土组合梁的力学性能,文中共测试20个直剪试件、2根短梁和4根FRP-混凝土组合梁,试验结果表明二次成型FRP腹板剪切强度较原FRP拉挤型材提高28%,极限剪应变达到原FRP拉挤型材的2.8倍,剪力达到峰值后只下降约20%。基于层合板理论和最大剪应变失效准则,推导出适用于此工艺的剪切刚度和剪切强度计算方法,计算结果和试验值吻合良好。利用适合于FRP的强度储备指标对二次成型FRP剪切破坏的强度储备进行计算,给出设计建议。
[Abstract]:The unidirectional arrangement of fiber leads to the extremely low shear strength of FRP extruded profile, which is easy to occur longitudinal shear failure in web plate. In order to overcome this shortcoming effectively, a secondary forming process for FRP pultrusion profile is put forward. In this process, FRP fiber cloth and resin are used as raw materials, and the interlayer between the web plates of two FRP extruded profiles is pasted in the middle, and the normal pretightening force is applied to ensure the joint work of all parts. In order to test the mechanical properties of secondary forming FRP extruded members and FRP- concrete composite beams, two short beams and four FRP- concrete composite beams with 20 straight shear specimens were tested. The test results show that the shear strength of the secondary forming FRP web is 28% higher than that of the original FRP extruded profile, the ultimate shear strain is 2.8 times of the original FRP extruded profile, and the shear force is only about 20% lower after the peak value of the shear force is reached. Based on the laminated plate theory and the maximum shear strain failure criterion, the calculation method of shear stiffness and shear strength for this process is derived. The calculated results are in good agreement with the experimental values. Using the strength reserve index suitable for FRP, the strength reserve of secondary forming FRP shear failure is calculated, and the design suggestions are given.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;东南大学国家预应力工程技术研究中心;徐州工程学院;
【基金】：国家自然科学基金(51008068) 江苏省“六大人才高峰”项目资助
【分类号】：U445;U446

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