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通过对7块中置和偏置集中荷载作用下纤维增强材料(FRP)筋混凝土双向板的受力试验,研究荷载位置、混凝土强度、FRP筋用量等因素对板冲切受力性能的影响。结果表明:集中荷载位置、混凝土强度、FRP筋配筋率是影响FRP筋混凝土双向板冲切受力性能的重要因素。随着混凝土强度的提高和FRP筋配筋率的增大,同等荷载水平下的混凝土和FRP筋应变逐渐减小,开裂后混凝土应变的增长逐渐加快;混凝土强度对板的抗裂荷载和极限冲切承载力影响较大,FRP筋配筋率的影响相对较小;FRP筋混凝土双向板在中置和偏置集中荷载作用下的破坏属于脆性的局部冲切破坏。
The effect of load position, concrete strength, FRP reinforcement and other factors on the mechanical properties of plate punching shear was studied by testing the strength of two-way fiber reinforced plastic (FRP) two-way slabs under seven central and bias concentrated loads. The results show that the location of concentrated load, the strength of concrete and the rate of reinforcement of FRP tendons are important factors that affect the punching shear strength of two-way slab of FRP reinforced concrete. With the increase of concrete strength and the increase of FRP reinforcement ratio, the strain of concrete and FRP tendons decreases at the same load level, and the strain of concrete increases gradually after cracking. The influence of cutting load is bigger, and the influence of FRP reinforcement ratio is relatively small. The failure of two-way slab of FRP reinforced concrete under central and bias concentrated loads belongs to brittle local blanking failure.