GFRP筋抗压力学性能试验研究

设计了GFRP筋抗压试验方案,通过试验研究了不同柔度GFRP筋的抗压力学性能.结果表明:GFRP筋的抗压破坏可以划分为3种,即强度破坏、非弹性失稳破坏和弹性失稳破坏;GFRP筋极限抗压强度小于极限抗拉强度,约为极限抗拉强度的55%;GFRP筋抗压弹性模量比抗拉弹性模量大.在进行GFRP筋抗压力学性能试验时,为防止局部破坏,试件端部应有良好的约束;为确定极限抗压强度设计曲线,应进行试件柔度对临界应力的影响试验.

Experimental study on compressive mechanical properties of GFRP rebars

Compression experiments were performed on GFRP rebars,and the compressive mechanical properties of GFRP rebars with different slenderness ratios were investigated.The results show that compressive failure modes can be classified as strength failure,non-elastic buckling and elastic buckling.It is also concluded that the ultimate compressive strength of GFRP rebars is about 55% of the ultimate tensile strength,and that the compressive elastic modulus is higher than the tensile elastic modulus.It is also indicated that the ends of the rebars should be well restricted during testing to prevent local failure,and additional studies should investigate the relationship between the slenderness ratio and critical stress in order to determine the design curve of ultimate compressive strength.