Justification of the pile cap rigidity

Pao Yue-kong Library Electronic Theses Database

Justification of the pile cap rigidity

 

Author: Ha, King
Title: Justification of the pile cap rigidity
Degree: M.Sc.
Year: 1999
Subject: Concrete piling
Reinforced concrete construction
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: 210, [59] leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1485274
URI: http://theses.lib.polyu.edu.hk/handle/200/978
Abstract: The objective of the present study is to investigate the assumption on the rigidity of reinforced concrete pile-caps. To achieve the aim, a finite element program using 9-node Lagrangian Mindlin plate element which is suitable for both thin and thick plate is developed. Various pile-cap examples have been studied by this finite element pile-cap program for which the pile is modeled as non-linear spring. The deflection shapes and the internal forces of the pile-cap and pile reactions have been studied. The assumption of rigid pile-cap is fully studied for different pile spacing and pile-cap thickness. The background theory for plate analysis, the traditional pile-cap analysis method: beam theory and truss theory, finite element method are also discussed and compared in this report. From the present study, it can be concluded that the behavior of all the practical pile cap is flexible in nature. There is no truly rigid cap. With the cap thickness increasing, all pile loads approach to the value determined from the rigid cap analysis, but they are never equal to rigid cap analysis result. It is also found that the bending moment and shear force obtained from finite element analysis are always smaller than that determined from rigid cap assumption. Since the cost of pile cap is usually very significant, it is recommended that the design engineers should adopt finite element analysis instead of the classical design method in order to reduce the cost of foundation.

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