无论从坝体的永久位移还是筋层轴力分布角度，坝内筋端的铰结连接方式要好于自由连接方式。
Whether permanent displacement of dam or the axial forces of anchor, the rigid attended mode is better than the free attended mode.
在自由端，应力为零而位移加倍。
However at the free end, displacement is double and strain is zero.
由螺旋器控制可以精确地确定自由端的位移量；
Displacement can be accurately confirmed by controlling the screw.
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