Title:
Failure Mode-Dependent Behavior of Carbon Fiber- Reinforced Polymer Prestressed Concrete Girders
Author(s):
Yail J. Kim, Jun Wang, Woo-Tai Jung, Jae-Yoon Kang, and Jong-Sup Park
Publication:
Structural Journal
Volume:
120
Issue:
5
Appears on pages(s):
139-151
Keywords:
carbon fiber-reinforced polymer (CFRP); failure mode; fullrange behavior; prestressed concrete; safety
DOI:
10.14359/51738841
Date:
9/1/2023
Abstract:
This paper presents the characteristics of concrete girders
prestressed with carbon fiber-reinforced polymer (CFRP) tendons when subjected to compression- and tension-controlled failure modes. To understand the full-range behavior of these girders beyond the boundary of design specifications, progressive failure is simulated using an advanced computational approach, agentbased modeling. Five bulb-tee girder sections are adopted with a variable amount of CFRP tendons and their flexural responses are examined until the intended failure modes are accomplished. The rate of capacity reductions in the compression-controlled sections is
governed by the degree of concrete crushing in the upper flange and the depth of the girder, whereas the rate in the tension-controlled girders is dominated by the sequential rupture of CFRP without demonstrating size dependency. When the girder concrete cracks, locally unstable responses are observed in the compression-controlled sections, which are not noticed in the other sections. As far as deformability is concerned, both girder configurations are satisfactory. Upon initiation of the progressive failure processes, the
level of safety varies differently depending upon the girder type and the arrangement of the tendons. The tension-controlled sections require more activation energy, representing a transition rate from the initial to damaged states, than their compression counterparts.
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