(福建省建筑设计研究院，福州 350001)

［摘要］算例表明，《建筑桩基技术规范》(JGJ94—94)式5112计算偏心竖向力作用下群桩中各桩竖向力仅对桩群坐标轴为形心主轴时成立。在规范修订中对于该公式的应用条件应加以说明和限制。利用材料力学的研究方法，给出了应用该规范公式的正确计算步骤。同时给出了适用于任意桩群形心轴的广义桩反力公式。

［关键词］多桩承台；形心主轴；广义桩反力公式

Research on counterforce of grouped piles under eccentric compression

 Ren Yu

 (Fujian Architecture Design & Research Institution, Fuzhou 350001, China)

Abstract:The results of pilot calculation show that the formula 5.1.1-2 of  Technical Code for Building Pile Foundations(JGJ94—94) comes into existence just when the calculational coordinates are set to the principal axis through centroid. It is appropriate to edit the text about the formula 5.1.1-2 of JGJ94—94. Using the method of mechanics of material, the correct calculation procedures about formula 5.1.1-2 are suggested. And then, the generalized formula of counterforce of grouped piles is given, which can be used for any coordinates through centroid.

Keywords:grouped piles cap; principal axis through centroid; generalized formula of counterforce of grouped piles