带承台倾斜单桩水平承载变形性状数值分析

Numerical Analysis of Lateral Bearing Deformation Behavior of Single Batter Pile with Cap

为研究带承台倾斜单桩水平承载变形性状,通过数值模拟手段分析了水平荷载作用下桩身倾角、长径比对桩顶带承台斜桩的承载变形性状的影响,并重点分析了竖向荷载对水平受荷斜桩性状的影响。结果表明:1水平荷载作用下,负斜桩的桩顶水平位移最大,直桩居中,正斜桩最小;桩身倾角越大,斜桩桩顶水平位移与相应直桩桩顶水平位移差值越大;相同情况下,长径比对斜桩桩顶水平位移影响不明显。2水平荷载作用下,桩身倾角只影响斜桩桩身弯矩的大小,而最大桩身弯矩的位置基本不变。3竖向荷载减小了负斜桩桩顶水平位移,却增大了正斜桩桩顶位移。4负斜桩的桩身最大弯矩随着竖向荷载的增大而减小,正斜桩却与之相反。

The influence of inclination angle and slenderness ratio, and especially vertical load, on the lateral response of single batter pile with cap was studied through 3-D finite element analysis. Results show that 1） under horizontal load, the lateral deformation of negative batter pile is larger than that of plumb pile, followed by positive batter pile. The difference of lateral deformation between batter pile and plumb pile increases with the increase of the inclination angle. The effect of slenderness ratio on the lateral deformation of batter pile is insignificant under the same condition; 2） the angle of batter pile affects only the value of moment along pile body under horizontal load. The position of the maximum moment of the pile is constant; 3） vertical load is favorable to decrease the lateral deformation of negative batter pile and increase the lateral deformation of positive batter pile; 4） the maximum moment of negative batter pile decreases as the increasing of vertical load, but it is in contrary with the positive batter pile.