Abstract: In combination with projections of reinforcement in different directions, bending moments and calculation methods of triangle caps with threepile foundations are given in detail, and at the same time, based on experimental results and theoretical formula of concrete slab punching bearing capacity published in literature, some comments about corner pile punching code formula are made. The research serves as a further explanation of corresponding code specifications of triangle caps with threepile foundations, and it helps to promote the design of this type of foundations.
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Key words: caps with threepile foundations; corner pile; bending moment; punching bearing capacity