ORCID Identifier(s)

0000-0002-6544-3748

Graduation Semester and Year

2019

Language

English

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Civil Engineering

Department

Civil Engineering

First Advisor

Nur Yazdani

Abstract

Repair with Carbon Fiber Reinforced Polymer (CFRP) has become a topic of great interest to engineers in the last two decades. Fiber Reinforced Polymer (FRP) is considered as one of the most popular and practical solutions for strengthening and retrofitting civil structures, including bridge girders. Several past studies indicated that a significant increase in strength and stiffness can be achieved by using this technology; however, the major drawback of this repairing method is debonding. This research investigated the flexural behavior of simulated lateral damaged pre-stressed concrete bridge girders. Five Tx28 girders were tested up to failure, where 4 of them were simulated to be laterally damaged, and then they were strengthened with pre-saturated CFRP anchored with different types of anchors. Applied load, the strains along bottom side of the girder and across the height, and deflection at various points of the span data were collected. Test results showed that strengthening of laterally damaged prestressed concrete bridge girders with a pre-saturated CFRP layer can restore and exceed the original capacity of the damaged girders. The best performance was for the girder that was strengthened using a mechanical anchor with a 7.25% increase in the failure load compared to the control girder. The results also suggest places for anchors to prevent debonding propagation between CFRP and concrete, and mitigate premature debonding failures.

Keywords

Prestressed girder, CFRP strengthening

Disciplines

Civil and Environmental Engineering | Civil Engineering | Engineering

Comments

Degree granted by The University of Texas at Arlington

Download

Share

COinS