GFRP抗浮锚杆在混凝土底板中荷载传递机制的数值模拟

Numerical simulation on load transport mechanisms of GFRP anti-floating anchor in the concrete floor

采用Abaqus模拟浮力作用下GFRP(Glass Fiber Reinforced Polymer)抗浮锚杆在基础底板中的受力性能.考虑到GFRP锚杆与混凝土的界面接触,应用Cohesive单元模拟锚杆-混凝土界面,建立空间轴对称有限元模型,并以试验结果为基础进一步分析锚固性能,为外锚固方法的改进提供参考.研究结论包括:零厚度的Cohesive单元模拟界面的黏结滑移,获得荷载-滑移曲线;锚杆轴向应力服从负指数分布;当荷载较小时,剪应力服从负指数分布,随着荷载增加,剪应力峰值向远加载端一侧转移.

Based on the Abaqus program, the mechanical behavior of GFRP （Glass Fiber Re- inforced Polymer） anti floating anchor in the foundation slab is simulated under the action of buoyancy. The interface problem between the GFRP anchor and concrete is considered, and the bolt-concrete interface is simulated by Cohesive Element, with axisymmetric finite ele- ment model established and the test results analyzed as reference. The main conclusions of the study include： 1. the bond-slip of the contact interface is simulated by Cohesive Element which has no thickness, and load-displacement curve is got. 2. The axial stress has a nega- tive exponential distribution. 3. When the load is small, shear stress has a negative expo- nential distribution, and with the load increasing, shear stress peak value moves to the side far from traction boundaries.