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桩刚度系数由下式定义:
其中:
Ep
-
桩身材料弹性模量 [MPa]
Es
桩周土割线模量平均值 [MPa]
Ra
桩截面面积和桩侧表面积之比 [-]
A1
桩截面面积平均值 [m2]
A2
桩侧表面积 [m2]
(对于刚性桩 Ra= 1)