Doctoral Dissertations

Ruili He

Keywords and Phrases

Bridge columns; CFRP; Combined loading; Earthquake; Rapid repair

Abstract

"This research aimed to develop a technique to rapidly repair reinforced concrete (RC) bridge columns for emergency service restoration after severe earthquake damage has occurred. Experimental and analytical studies were conducted to study the performance and effectiveness of the proposed repair method. The experimental study included a series of 1/2-scale RC square bridge columns originally tested to failure under constant axial and increasing cyclic lateral loadings resulting in combined flexure, shear, and torsion with different torsional-to-flexural moment ratios. Using externally bonded carbon fiber reinforced polymer (CFRP) sheets, each column was repaired over a 3-day period and then retested under the same combined loading as the corresponding original column. Ruptured and/or buckled longitudinal reinforcing bars were not treated during the repair. A strength-based methodology was used to design the CFRP strengthening system to compensate for the strength loss due to the damage observed after the original test. Results indicated that the severely damaged columns were successfully repaired using the developed technique, with the exception of one column with fractured longitudinal reinforcing bars near the joint, which was only partially restored. The response of a prototype bridge structure was analyzed under earthquake loadings using OpenSees software considering different numbers and locations of repaired columns in the model. A technique was developed to model the response of the repaired column that accounted for the different damage and repair conditions along the column. The bridge models with one or more of the repaired columns were found to be capable of resisting the base shear and drift demand by the 40 ground motion records selected according to the target design spectrum, which confirmed the effectiveness of the repair"--Abstract, page iv.

Advisor(s)

Sneed, Lesley

Committee Member(s)

Belarbi, Abdeldjelil
Chen, Genda
Myers, John
Chandrashekhara, K.

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering

Sponsor(s)

University of Missouri Research Board
Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2014

Journal article titles appearing in thesis/dissertation

  • Seismic repair of reinforced concrete bridge columns: a review of research findings
  • Rapid repair of severely damaged RC columns with different damage conditions -- an experimental study
  • Rapid repair of a severely damaged RC column having fractured bars using externally bonded CFRP
  • Torsional repair of severely damaged column using carbon fiber-reinforced polymer
  • Post-repair seismic performance of damaged RC bridge columns with fractured bars -- a numerical assessment

Pagination

xiii, 333 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2014 Ruili He, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Concrete bridges -- Foundations and piers
Columns, Concrete -- Fatigue
Reinforced concrete construction
Earthquake engineering -- Research
Torsion

Thesis Number

T 10532

Electronic OCLC #

894224410

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