Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Bearing Capacity of Precast Concrete Piles with Step Tapered Base
H. Murakami; Asahi Chemical Construction Materials Co. Ltd, Japan A. Ohshima; Nippon Concrete Industries Co. Ltd, Japan

On accordance with the increase of scale of structures in Japan, strong demands are arising for the foundations that claim high performance both in load carrying capacity and economy. It is common way to adopt bearing pile for a foundation of structures in Japan. It is well known that bearing capacity of pile consists of two components, base resistance and skin friction of pile shaft. Considering that the ground condition is generally not so good in Japan, one cannot depend on the shaft friction so much and it is more reasonable to enhance base resistance to increase the performance of a pile. From this point of view, the precast concrete piles with step tapered base, "ST- Piles" are developed. The ST-Piles are made of precast high strength concrete that has the compressive strength over 80MPa, and characteristically have enlarged base (step tapered base), 600 mm in diameter when pile shaft diameter is 500 mm. In the paper, the detailed results of field loading tests of ST-Piles are described, and finally the method of practical design and coefficient of bearing capacity for this kind of piles are presented.

 article #480; publication #37 (IC-1991-IT)