Behavior of Hybrid Reinforced Concrete Bridge Decks under Static and Fatigue Loading
Jared W McRory1, Fray F Pozo-Lora2, Zachary Benson3
1Engineer, ARW Engineers, Ogden, UT 84404, USA.
Polymers
|December 11, 2022
Summary
A novel hybrid reinforced concrete (Hybrid) using Glass Fiber Reinforced Polymer (GFRP) rebar and fiberglass macrofibers offers a viable bridge deck alternative. This innovative material demonstrates excellent flexural behavior and adds ductility to GFRP-reinforced sections.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Traditional bridge decks often use steel reinforcement, which is susceptible to corrosion.
- Glass Fiber Reinforced Polymer (GFRP) rebar offers corrosion resistance but can be brittle.
- There is a need for advanced reinforcement materials that enhance both durability and structural performance.
Purpose of the Study:
- To introduce and evaluate a new hybrid reinforced concrete (Hybrid) system for bridge decks.
- To assess the structural performance of Hybrid bridge decks under static and fatigue loading.
- To compare the Hybrid system's performance against traditional steel and GFRP reinforced decks.
Main Methods:
- Construction and testing of thirteen full-scale bridge deck specimens.
- Application of static and fatigue loading (up to 2 million cycles at 4 Hz).
- Utilizing simplified and moment-curvature analytical models for flexural strength prediction.
Main Results:
- Hybrid decks showed adequate service and ultimate limit state behavior compared to AASHTO LRFD standards.
- Analytical models accurately predicted pre- and post-fatigue flexural strength.
- Hybrid reinforcement demonstrated exceptional post-peak energy absorption, enhancing ductility.
Conclusions:
- The Hybrid reinforced concrete system is a viable alternative for bridge deck reinforcement.
- Hybrid decks provide enhanced ductility and comparable structural performance to steel and GFRP decks.
- This innovative material addresses limitations of conventional reinforcement in bridge construction.
More Related Videos
Related Concept Videos
01:22Fatigue Strength of Concrete
247
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
247
01:23Behavior of Concrete Under Compressive Load
237
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
237
01:22Creep in Concrete
366
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
366
01:19Normal Stress
649
Normal stress is a type of stress that occurs when forces act perpendicular, or normal, to a material's cross-sectional area. This stress often arises in structures when subjected to axial loading, which is the application of force along the axis of an object. A practical example of this can be found in bridge truss members.
When a rod is under axial loading, the internal forces and corresponding stress are normal to the plane of the section, so it is termed normal stress. It's...
When a rod is under axial loading, the internal forces and corresponding stress are normal to the plane of the section, so it is termed normal stress. It's...
649
01:24Cable Subjected to a Distributed Load
772
The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
772
01:25Effects of Creep
209
Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
209