Finite Element Analysis of Concrete-Filled Steel Tube

Beams Partially Wrapped with CFRP sheet

Finite Element Analysis of Concrete-Filled Steel Tube

Beams Partially Wrapped with CFRP sheet

Ahmed W. Al-Zand , Wan Hamidon Wan Badaruzzaman, Azrul A. Mutalib and Salam J. Hilo

Department of Civil and Structural Engineering Faculty of Civil Engineering and Built EnvironmentNational University of Malaysia (UKM)

INTRODUCTION

Concrete-Filled Steel Tube Members (CFST)

INTRODUCTION

Application of concrete-filled steel tube beams

Nakamura et al. 2002Bridge of Shinkansen - Japan

INTRODUCTION

CFRP sheet-tensile strength

INTRODUCTION

Literature Review Tao et al., [2007]

Sundarraja and Ganesh [2011]

OBJECTIVES

• Study the potential use of CFRP sheets for strengthening the square and circular CFST flexural members

• Investigate the behavior of CFST beams which are wrapped partially by CFRP sheets

• Establish the optimum CFRP wrapping length and no. of layers could be used for strengthening action

FINITE ELEMENT ANALYSIS

A. Modelling of the CFST beams

Square Tube (91.5 x 91.5 x 3.6mm)

Circular Tube (107.4x 3.5mm)

FINITE ELEMENT ANALYSIS

B. Verification of the Finite Element Model

NUMERICAL ANALYSIS OF CFST BEAMS STRENGTHENED BY CFRP SHEET

RESULTS AND DISCUSSION

CONCLUSION

•The proposed FE modelling is sufficient to implement the behaviours of the CFST beams partially wrapped with CFRP sheet.

•Beams wrapped along 50% of its length showed decreasing of their ultimate moment capacities with increasing layers of CFRP patch because of the delamination failures was occurred.

•Beams wrapped along 75 & 100% of its length showed increasing of their ultimate moment capacities with increasing layers of CFRP patch, where they reached their ultimate strength.

CONCLUSION

•No significant improvement was observed in the ultimate moment capacity for square and circular CFST beams when the CFRP wrapping length increased from 75 to 100%.

•The capacity of circular CFST beam showed better improvement than the square beam when strengthened by 1 & 3 CFRP layers, where it’s increased around 65 & 100% for circular beams compared to only 19 & 64% for square beams, respectively.

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