厚桩承台承载力的试验研究

为探讨厚桩承台的合理设计计算方法，本文完成了７５个厚桩承台试件的模型试验，包括两桩台、三桩台、四桩台及六桩台试件，所有三、四、六桩厚承台试件破坏属于冲剪破坏，两桩台试件中，部分发生剪切破坏，部分发生弯曲破坏。

EXPERIMENT AND RESEARCH ON THE BEARING CAPACITY OF THICK PILE CAP

In order.to provide a reasonable design method for thick pile cap, a seriesof test on 75 thick pile cap models with two, three, four and six piles has been carriedout.All of the models with three, four and six piles failed in punching shear, while fortwo-pile caps,some failed in shear, the others in tension. Based on the test results,the failure model and load transfer mechanism are presented. It is proved that the behavior of thick pile cap is different from that of ordinary pile cap, and the bearing capacity of thick pile cap is usually controlled by its punching shear strength and itsload transfer path is approximately treated as space truss.The formulas including theregression equations and design formulas for punching shear strength and new steel ratio of thick pile caps with two, three, four and six piles are proposed. Compared withthat obtained by current design procedure, the depth of pile cap obtained in this paper is reduced by 30-40 percent.