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Shear Design of Prestressed Concrete Girders Using FRP as Auxiliary Reinforcement
Concrete cracking diminishes the protection to embedded metallic reinforcements in aggressive environments. Consequently, corrosion ensues leading to loss of mechanical properties and reinforcement area and, in some cases, to failure of structural members. As such, more durable and sustainable new materials such as Fiber Reinforced Polymers (FRPs) have been gaining attention from bridge engineers. Current design guide specifications do not address all limitations related to the design of prestressed concrete girders using FRP auxiliary (non-prestressed) reinforcement, whose mechanical properties are different than traditional carbon steel. Furthermore, these guides are based on empirical models and scattered experimental data, resulting in a barrier against wider adoption of FRP as auxiliary reinforcement. Therefore, design provisions based on a more refined analytical approach followed by an experimental campaign are needed.
A project titled “Guidelines for the Design of Prestressed Concrete Bridge Girders using FRP Auxiliary Reinforcement” and funded by the National Cooperative Highway Research Program (NCHRP) is currently underway. Based on published work and initial analytical phases, an extensive experimental program was planned, which includes: small-scale specimens for post-tensioning applications, push-off specimens for interface shear transfer, and full-scale prestressed girders fully reinforced with FRP transverse reinforcements. The experimental results will assist in assessing existing design provisions regarding the end beam bursting force, confinement behavior and splitting reinforcement, stirrups design strain limitations, and stirrup bent strength reduction. Draft design guidelines will be proposed to AASHTO (American Association of State Highways and Transportations Officials). This paper provides a project overview with emphasis on the shear design.
Shear Design of Prestressed Concrete Girders Using FRP as Auxiliary Reinforcement
Concrete cracking diminishes the protection to embedded metallic reinforcements in aggressive environments. Consequently, corrosion ensues leading to loss of mechanical properties and reinforcement area and, in some cases, to failure of structural members. As such, more durable and sustainable new materials such as Fiber Reinforced Polymers (FRPs) have been gaining attention from bridge engineers. Current design guide specifications do not address all limitations related to the design of prestressed concrete girders using FRP auxiliary (non-prestressed) reinforcement, whose mechanical properties are different than traditional carbon steel. Furthermore, these guides are based on empirical models and scattered experimental data, resulting in a barrier against wider adoption of FRP as auxiliary reinforcement. Therefore, design provisions based on a more refined analytical approach followed by an experimental campaign are needed.
A project titled “Guidelines for the Design of Prestressed Concrete Bridge Girders using FRP Auxiliary Reinforcement” and funded by the National Cooperative Highway Research Program (NCHRP) is currently underway. Based on published work and initial analytical phases, an extensive experimental program was planned, which includes: small-scale specimens for post-tensioning applications, push-off specimens for interface shear transfer, and full-scale prestressed girders fully reinforced with FRP transverse reinforcements. The experimental results will assist in assessing existing design provisions regarding the end beam bursting force, confinement behavior and splitting reinforcement, stirrups design strain limitations, and stirrup bent strength reduction. Draft design guidelines will be proposed to AASHTO (American Association of State Highways and Transportations Officials). This paper provides a project overview with emphasis on the shear design.
Shear Design of Prestressed Concrete Girders Using FRP as Auxiliary Reinforcement
Lecture Notes in Civil Engineering
Ilki, Alper (editor) / Çavunt, Derya (editor) / Çavunt, Yavuz Selim (editor) / Belarbi, Abdeldjelil (author) / Okeil, Ayman (author) / Nanni, Antonio (author)
International Symposium of the International Federation for Structural Concrete ; 2023 ; Istanbul, Türkiye
2023-06-03
11 pages
Article/Chapter (Book)
Electronic Resource
English
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