建立了PC C桩复合地基优化设计的目标控制函数和两个约束条件：沉降控制条件和承载力校核条件。
The governing object function and two boundary condition: settlement and foundation bearing capacity are developed in the optimization design of the PCC pile composite foundation.
另外，桩头约束的存在与否，对单桩的横向阻抗函数值也有较大的影响，桩头有约束的阻抗函数值要明显大于无约束的阻抗函数值。
It also should be noticed that whether there is restraint or not on top of the pile will have great influence on the impedance function.
因为压顶圈梁可改变支护桩的内力与位移，二者在空间中相互约束，彼此协调。
Because top beam can change internal force and displacement of supporting pile, and both them restrict and correspond each other in space.
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