The deflection curve is a sinusoidal for the rod with a zero self-weight.

自重为零时，杆轴线为半个正弦曲线；

The deformation results of the pile foundation with varied size are discussed in the paper. The deflection curve for the pile foundation in the ground with different widths is given.

探讨了不同尺寸桩基础的变形计算结果，给出了桩基础宽度与地面转角的关系曲线。