翼板桩水平承载规律计算研究

基于规范方法和实测数据对比分析了两种已有异形桩水平承载理论计算方法的适用性,在此基础上考虑异化深度、翼径比等因素对带翼管桩水平承载性状进行了规律性影响研究。结果表明:同等条件下,桩顶位移随异化深度和翼径比的增大均呈非线性减小,减小速率逐渐趋缓;桩身最大弯矩也随翼径比的增大而减小;但随异化深度的增大则呈先增大后减小的趋势。当异化深度为2d~3d时桩身最大弯矩值最小;翼板桩的水平承载力随异化深度增大而非线性增大,异化深度在0~3d之间时增大幅度最为明显;翼板面积保持不变,桩身刚度相对较小时,建议采用方形翼板;桩身刚度较大时可以考虑使用矩形翼板。

Calculation research on horizontal bearing characters of pile with wing plate

The applicability of two existing theoretical calculation methods of horizontal bearing abnormal section pile were comparative analyzed based on code method and testing data. The better method was then used to study the horizontal bearing character of pipe pile with wing plate considering the influence of alienation depth and alienation wing-diameter ratio. The result shows that, under the same conditions, the displacement of pile head nonlinearly decreases with the increase of alienation depth and alienation wing-diameter ratio, and the decrease rate is gradually slowing down. The maximum bending moment of pile also decreases with the increase of alienation wing-diameter ratio, but presents a trend of first increased and then decreased with the increase of alienation depth, the smallest of maximum bending moment appears when the alienation depth is between 2d to 3d. The bearing capacity of abnormal section pile nonlinearly increases with the increase of alienation depth, and 0-3d is the most significant increasing range. With the same area of the wing plate, square wing plate is recommended to be used when the pile body stiffness is relatively small, and rectangular wing plate can be considered under the opposite condition.