Contribution to the Improvement of the Mechanical Behaviour and the Rational Design of Pile Caps
Abstract
The main objective of the thesis is the investigation, analytical and experimental, of the mechanical behaviour of the structural elements whose function is to transfer load from a column to a group of piles. Pile caps are short elements featuring low shear span ratios, which requires strut-and-tie models for their design and detailing. In the experimental part of the research, conventional and non-conventional reinforcement arrangements are examined. The experimental results of the conventionally reinforced specimens showed that there is an upper limit for the amount of the tie reinforcement over which the ties do not develop their full strength and the failure load of the pile cap is determined by the strength of the inclined struts. This finding led the research towards the search of non-conventional reinforcement arrangements which would activate an additional strut-and-tie model in the pile cap and would maximize, for a given reinforcement - concrete ratio, the ultimate strength u ...
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