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不对称布桩桩基的桩顶荷载效应分析
doi: 10.13204/j.gyjz201504022
ANALYSIS OF ACTING FORCE ON PILE TOP OF FOUNDATION WITH ASYMMETRIC PILES
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摘要: 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 942008《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 942008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 942008的算式的计算结果进行比较,得到JGJ 942008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。
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关键词:
- 不对称布桩 /
- 桩顶荷载效应 /
- JGJ 94—2008 /
- 误差分析
Abstract: The formula of acting force on pile top of foundation with asymmetric piles was deduced． Analysis showed that the formula of Technical Code for Building Pile Foundations ( JGJ 942008) was a special case，which was only applicative with the situation of symmetric arrangeing piles and selecting the origin of coordinates should be careful when the formula was used，centroid of pile group instead of centroid of cushion cap should be selected as the origin of coordinates． Meanwhile，through analysis results of the formula， larger calculation error appeared on the asymmetric piles using the formula of JGJ 942008． When calculating acting force on pile top，designer should choose the reasonable formula according to real situation．-
Key words:
- asymmetric piles /
- acting force on pile top /
- JGJ 94—2008 /
- error analysis
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