大悬挑圆板基础计算方法探讨

本文通过试验．研究了大悬挑圆板基础的破坏图形及破坏机理．并对此类板的极限承载 力的计算方法进行了探讨．发现板的实测极限荷载比按极限平衡法计算求得的极限荷载约低２８％ 左右，且随着板的ｒ１／ｒ３的增大，其差值越大，从而认为目前对烟囱、简体水塔的圆板基础的承 载力计算普遍采用的极限平衡法不适用于大悬挑圆板基础，偏于不安全．对于大悬挑圆板基础， 仍以采用弹性理论计算为宜．

The Calculation on Circular Plate Foundations of Reversed Conical Shell Water Tower

In this paper the tests were made to study the failure scheme and the mechanism of circular plate foundations of reversed conical shell water tower, and to inquire into the calcu- lating methods on the ultimate bearing resistance of the circular plate foundations mentioned above. It was found that the practical ultimate load was about 28 per cent lower than the one calculated with the method of limit equilibrium and the difference between the two increased with the increment of the ratio r1 / r3 in the plate. So the method of limit equilibrium, that is adopted generally to calculate the load-carrying capacity of circular plate foundations of water tower or chimney at present, is not applicable to the circular plate foundations with large cantilever of reversed conical shell water tower, because the result from this method is not safe. Therefore the calculation on elastic theory is still suitable for the foundations of reversed conical shell water tower.