纤维增强复合桩水平承载性能对比研究

Comparative Study on Horizontal Bearing Capacity of Fiber Reinforced Composite Piles

纤维增强复合材料(Fiber Reinforced Polymer,FRP)目前广泛应用于结构的补强加固,用来增强构件的强度和刚度,改善结构的受力性能.基于平截面假定,通过编制MATLAB程序求解桩身截面在荷载作用下的弯矩-曲率关系,得到GFRP复合桩、钢筋混凝土桩和GFRP布钢筋混凝土桩的抗弯刚度.同时开展三种桩型抗弯刚度和水平承载力的模型实验,并与计算结果进行对比分析.结果表明:GFRP布钢筋混凝土桩的抗弯刚度最大,相同水平荷载下位移最小,钢筋混凝土桩次之,GFRP复合桩抗弯刚度最小.GFRP布钢筋混凝土桩的抗弯刚度比钢筋混凝土桩大16.9%.

Fiber reinforced polymer was widely used to reinforce the structure,which could enhance the strength and stiffness of the component and improve the mechanical performance of the structure.Based on the flat section assumption,the MATLAB program was compiled to solve the bending moment-curvature relation of pile under load.The bending stiffness of GFRP composite piles,reinforced concrete piles and RC pile wrap with GFRP was calculated.The calculation results were compared through the model test of three kinds of pile type bending stiffness and horizontal bearing capacity.The results show that the flexural rigidity of RC pile wrap with GFRP is the largest,and the displacement under the same horizontal load is the smallest.The flexural rigidity of reinforced concrete pile is second,and the flexural rigidity of GFRP composite pile is minimum.The flexural rigidity of RC pile wrap with GFRP is 16.9% higher than that of reinforced concrete piles.