[提要]  规范JCJ 94-94及CECS 88:97为桩承台合理设计提供了依据。作者在编制《钢筋混凝土低桩承台通用图集》的过程中，发现对二桩承台高度的合理确定需要进一步探讨。通过多份有关文献及大量计算实例的对比分析，提出了比较实用的合理确定二桩承台高度的方法。
[关键词]  剪跨比  剪切系数  冲跨比  冲切系数  二桩承台合理高度

The rules of JGJ 94-94 and CECS 88:97 provide a basis for reasonable design of pile caps.But in course of compiling Common, Design, Atlas For Reinforced Con,crete Pile Caps, it is found that the reasonable height of two pile caps need to be discussed.Through comparison and analysis of relative references and calculation examples,this paper glves a simple method to establish the reasonable height of two pile caps.
Keywords: shear span ratio; shear coefficient; punching span ratio; punching coefficient; reasonable height;  two pile caps