玻璃纤维增强复合桩水平承载特性试验与数值模拟

Test and numerical study on the bearing capacity of GFRP composite pile under lateral loadings

玻璃纤维增强复合材料(GFRP)具有轻质、抗拉强度高、耐腐蚀性和抗疲劳等优点,广泛应用于土木工程领域。GFRP复合桩是一种通过在普通混凝土桩身外包GFRP纤维布以增强其抗弯性能的新型桩。通过开展室内模型试验,分别得到了水平荷载下RC桩和GFRP复合桩桩顶位移、桩身弯矩的试验结果,对比分析了两者的水平承载特性。利用有限元分析软件ABAQUS对水平荷载作用下的GFRP复合桩进行数值模拟,试验结果与数值模拟结果拟合较好。结果表明:GFRP复合桩与RC桩的桩身弯矩分布规律基本一致,最大弯矩在1/4~1/3桩长处,GFRP复合桩的水平承载特性优于RC桩;不改变桩身截面,仅在一层GFRP单向布的约束下,GFRP复合桩的弹性模量、极限水平承载力均有一定的提高。

Glass Fiber Reinforced Polymer（GFRP）was widely used in civil engineering considering its advantages of lightweight,high tensile strength,corrosion resistance and fatigue resistance,etc.GFRP composite pile is a new type of pile reinforced by GFRP upon RC pile to enhance its bending resistance.The lateral displacement and bending moment of the RC pile and GFRP composite pile were obtained and analyzed via the model test.The lateral bearing capacity of both two pile types were compared and analyzed.The GFRP composite pile under lateral loadings was simulated by the FEA software ABAQUS.The experimental results are in good agreement with the numerical simulation results,both shouing that the bending moment distribution of GFRP composite pile was consistent with the RC pile,and themaximum bending moment occurred nearby the depth of 1/4 to 1/3 pile length.However,the horizontal load-bearing capacity of GFRP composite pile was much greater.The elastic modulus and lateral ultimate capacity of GFRP composite pile covered with a layer of GFRP unidirectional fabric canbe improved to a certain extent.