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超长桩承载性状的最小势能数值计算方法

, PP. 69-76

Keywords: 桥梁工程,桩基础,能量法,承载性状,荷载传递,最小势能

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Abstract:

针对超长桩的计算求解方法问题,基于最小势能原理提出了超长桩承载性状的程序计算方法。首先,对用于程序计算的侧阻及端阻计算模型进行了简要介绍;其次,推导了桩身的能量平衡方程,并由此得到桩身单元的位移、轴力计算式;再次,基于最小势能原理推导了桩身的势能增量计算式,并采用黄金分割法作为计算程序的收敛算法;最后,用工程实例对文中方法进行了验证,通过实测资料获取了实际的桩土荷载传递关系,采用折线模型和双曲线模型并存的程序计算模式,使用黄金分割法对最小势能状态进行搜索,结果表明计算值与实测数据较为符合,文中方法可为实际工程中的科研、设计工作提供参考。

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