Prediction of Shear Strength of Reinforced and Prestressed Concrete Beams by Finite Element Method

Abdel-Kader, Mohamed Mohamed Ahmed (1993) Prediction of Shear Strength of Reinforced and Prestressed Concrete Beams by Finite Element Method. PhD thesis, University of Glasgow.

Abstract

This thesis presents a 2-D finite element model that can be used to predict the shear strength of reinforced and prestressed concrete beams. A comparison between the predictions of 3-D and 2-D finite element models was made first, from which it was concluded that the 2-D finite element model is sufficient to predict the behaviour of reinforced concrete beams. To improve the results of the 2-D finite element, five parameters which have a significant effect on the prediction of the failure load and the corresponding mode of failure were studied. These parameters are: (i) shear retention factor, (ii) tensile strength of concrete, (iii) magnitude of the strain corresponding to the peak stress in the stress-strain curve of concrete in compression, (iv) tension softening of concrete, and (v) compression softening of concrete. The developed model is used In a nonlinear finite element program. Only smeared cracking approach was used. After developing, the model was tested against more than two hundred reinforced and prestressed concrete beams from seven previous experimental investigations. These beams were with and without shear reinforcement having rectangular, I, and Tee cross-sections. The beams covered important variables affecting the shear strength of reinforced concrete beams such as: shear span to depth ratio a/d, amount of shear reinforcement, effective depth and width of beam, and compressive strength of concrete. Most of the beams failed in shear. Because of the fact that in many previous studies on a small number of beams, the emphasis had been placed purely on the prediction of the failure load, very often the corresponding mode of failure differed significantly from the actual mode of failure. In this study particular emphasis is placed on the predicted mode agreeing with the actual mode of failure. The model was capable of predicting to good accuracy the failure load, the mode of failure, the load-deflection curve, and the stresses in reinforcement.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Additional Information: Adviser: P Bhatt
• Keywords: Civil engineering
• Date of Award: 1993
• Depositing User: Enlighten Team
• Unique ID: glathesis:1993-75485
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 19 Dec 2019 09:15
• Last Modified: 19 Dec 2019 09:15
• URI: https://theses.gla.ac.uk/id/eprint/75485