Confinement effect of CFRP and steel ties in circular RC columns 30 MPa concrete strength

Date of Publication

2006

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Civil Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Adviser

Jason Maximino C. Ongpeng

Defense Panel Member

Andres Winston C. Oreta
Ronald S. Gallardo
Mary Ann Q. Adajar

Abstract/Summary

In today's technology, the methods of confinement are now being used in retrofitting and rehabilitating concrete structures. Through extensive research, Carbon Fiber Reinforced Polymers (CFRP) is slowly being introduced in the construction industry. The used of CFRP is a good material for confining the concrete structures, in addition, its properties also shows remarkable performance due to its resistance to corrosion, flexibility and it is lightweight.

Circular RC columns with 180 mm diameter and height of 500 mm were wrapped with CFRP and were then tested under uniaxial compressive loading until failure. The fibers sheets of the CFRP were oriented 90() with respect to the longitudinal axis in order to provide lateral reinforcement to the RC column. This paper investigated the axial load, axial strain and the lateral strain of the wrapped RC columns and compared it with the plain RC columns.

The most significant increase in strength was seen for the specimens wrapped with 2 layers of CFRP. For specimens having no steel ties the increase in strength is 47%, while the specimens with the 40 mm steel tie spacing achieved an increase of 72% in the ultimate compressive strength. As a result, the increase in compressive strength for a typical reinforced concrete column was greatest when wrapped with 2 layers of CFRP because it increases the load bearing capacity of the column. The research had shown that the use of CFRP increases the ductility of the column as well as the physical properties like aesthetics. Thus, minimizing the amount of maintenance required.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU13543

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

ix, 51 leaves : ill. (some col) ; 28 cm.

Keywords

Concrete construction; High strength concrete

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