不同包裹角度下GFRP复合桩水平承载特性研究

Study on the Horizontal Bearing Capacity of Fiberglass Composite Piles with Different Wrap Angle

玻璃纤维增强复合材料(Glass Fiber Reinforced Polymer)是由玻璃纤维和基体材料按照一定比例混合而成的高性能材料,具有轻质高强、耐腐蚀和抗疲劳的优点。GFRP复合桩是利用GFRP筋代替钢筋,并且在桩身包裹GFRP布的一种新型桩基形式。为了研究在桩身表面粘贴不同角度的GFRP单向布对GFRP复合桩水平承载性能的影响。通过室内模型试验,研究了在桩身表面分别按照30°、45°和60°包裹GFRP单向布,对单桩的水平承载力和抗弯刚度的影响。利用ABAQUS有限元软件建立模型,对不同包裹角度GFRP复合桩的水平承载力进行数值模拟。试验结果表明:随着包裹角度的增加,单桩的水平承载力和抗弯刚度随之增加,桩身的弯矩则减小少。在桩顶承受2000 N的水平荷载作用时,GFRP布按60°包裹的GFRP复合桩的水平位移比按30°包裹减小了21.8%,桩身截面的最大弯矩减小了16.7%。增大GFRP单向布在桩身的包裹角度,可以提高GFRP复合桩的水平承载力。

Glass Fiber Reinforced Polymer is a high-performance material made of glass fiber and matrix materials in a certain proportion.It has the advantages of high quality,corrosion resistance and fatigue resistance.GFRP composite piles are a new type of piles that use GFRP bars instead of steel bars and wrap the GFRP fabric in the piles.In order to study the effect of GFRP on the horizontal bearing capacity of the GFRP composite pile,the GFRP unidirectional fabric with different angles was studied.The effects of GFRP fabric wrapped at 30°,45°and 60°on the horizontal bearing capacity and bending stiffness of single pile were studied by indoor model tests.The horizontal bearing capacity of GFRP composite piles with different wrap angles was simulated numerically with ABAQUS finite element software.The test results show that,with the increase of the angle of the wrap,the horizontal bearing capacity and bending stiffness of the single pile increases,and the bending moment of the pile decreases.When the pile top subjected to the horizontal load of 2000 N,the horizontal displacement ratio of GFRP composite piles wrapped by 60°is reduced by 21.8%at 30°package,and the maximum bending moment is reduced by 16.7%.Increasing the wrapping angle of the GFRP cloth on the pile body can improve the horizontal bearing capacity of the GFRP composite pile.