Investigation of Lateral Stability of UHPC Beams Supported by Bearing Pads Considering the Nonlinear Lift-Off Effect
Publication: Journal of Structural Engineering
Volume 149, Issue 3
Abstract
Ultrahigh-performance concrete (UHPC) is an advanced cement-based material with a compressive strength greater than 150 MPa. The application of UHPC on prestressed girders allows the design of very long spans with thin sections. However, the increased slenderness, low lateral flexural stiffness, flexible supports, and beam imperfections make lateral instability critical. Therefore, this paper presents an analytical prediction of precast beams’ behaviors considering the nonlinear contact interaction with the bearing pads. The nonlinear geometric theory for the slender element is coupled with the nonlinear contact mechanism developed between the beam and pad through the energy approach. The proposed solutions are compared with the equations available in the literature that consider the linear stiffness contact interaction. Changes in the limit load of up to 84% were a result of the lift-off effect (contact interaction). From the results, the UHPC is highly sensitive to lateral instability, giving a maximum load/dead weight ratio of up to 1.08 where the common technical recommendation is greater than four.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 3 • March 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Sep 16, 2021
Accepted: Sep 16, 2022
Published online: Dec 22, 2022
Published in print: Mar 1, 2023
Discussion open until: May 22, 2023
ASCE Technical Topics:
- Beams
- Compressive strength
- Concrete
- Concrete beams
- Engineering materials (by type)
- Engineering mechanics
- High-performance concrete
- Lateral stability
- Material mechanics
- Material properties
- Materials engineering
- Nonlinear response
- Statics (mechanics)
- Stiffening
- Strength of materials
- Structural behavior
- Structural engineering
- Structural members
- Structural systems
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