不同纤维对GFRP格栅混凝土力学性能

Mechanical Property of GFRP Grid Concrete with Different Fibers

由于现有混凝土抗拉强度较低和GFRP格栅刚度较小,将GFRP与混凝土进行复合不能充分发挥两种材料的力学性能。在混凝土中添加纤维不仅可以提高混凝土的拉伸强度还可以提高其刚度,从而更好地发挥复合材料格栅的力学性能。为了研究钢纤维和聚烯烃纤维对复合材料格栅力学性能的影响,首先制备了纯GFRP格栅梁、钢纤维格栅梁以及聚烯烃纤维格栅梁,然后通过弯曲实验对试件的力学性能进行了研究,最后通过实验数据和现象对不同纤维对GFRP格栅混凝土力学性能进行研究,结果表明:聚烯烃纤维增强GFRP格栅混凝土承载力和刚度最高,钢纤维纤维增强GFRP格栅混凝土承载力和刚度较低,纯GFRP格栅混凝土承载力和刚度最低。掺入纤维可以阻止裂缝的发展,1%聚烯烃纤维的效果要比混合1.1%钢纤维的效果好。

Due to the low tensile strength of concrete and the low stiffness of GFRP grid,the mechanical property of GFRP grid concrete can not be performed.The stiffness and strength of concrete can be enhanced by the added fibers,and the mechanical property of GFRP grid concrete can not be performed better.To study the effect of the steel fiber and polyolefin fiber on the mechanical behavior of composite grid,GFRP grid beam and polyolefin fiber beam,steel fiber grid gratings beam are prepared firstly.And then the mechanical properties of the specimens were studied through the experiment,research shows that：GFRP grid concrete reinforced by the polyolefin fiber bears the highest capacity and stiffness,GFRP grid concrete reinforced by the steel fiber bears lower capacity and stiffness,the GFRP grid concrete bears the lowest capacity and stiffness.The development of cracks could be prevented by incorporating fiber,the effect of hybrid polyolefin fiber1% is better than hybrid steel fiber 1.1%.