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对不对称布桩时桩顶荷载效应的计算式进行推导。通过分析发现,JGJ 94—2008《建筑桩基技术规范》给出的算式为文中推导式的特殊情况,JGJ 94—2008的算式仅在对称布桩时成立;实际使用时,应注意坐标原点的选取,取群桩的形心作为计算原点而不是承台的形心。同时对文中算式和JGJ 94—2008的算式的计算结果进行比较,得到JGJ 94—2008的算式在计算不对称布桩时存在较大的误差。设计人员在计算桩顶荷载效应时,应分析群桩基础的布桩情况,合理选择算式。
The calculation formula of pile top load effect when unsymmetrical bolting is deduced. It is found through analysis that the formula given in JGJ 94-2008 Technical Specification for Building Pile Foundation is the special case of the derivation in this paper. The formula of JGJ 94-2008 is valid only when symmetrical pile distribution. In actual use, Select the center of the group pile as the calculation of the origin rather than the centroid of the cap. At the same time, the formulas of JGJ 94-2008 are compared with those of the formulas in the text. The formulas of JGJ 94-2008 are found to have large errors in the calculation of unsymmetrical pile distribution. When calculating the load effect of pile top, designers should analyze the pile distribution of pile foundation and choose the formula reasonably.