Temperature Induced Nonlinear Effect on Free Vibration Characteristics of Fibre Reinforced Polymer Bridge Deck

This paper outlines the static and fatigue behavior of cast-in-place, second-generation steel-free bridge decks. Although cast monolithically, the first bridge deck was divided into three segments. The first segment was reinforced with steel, according to conventional design. The other two segments were steel-free designs with internal crack-control grids, one consisting of carbon-fibre-reinforced polymer (CFRP) and the other consisting of glass-fibre-reinforced polymer (GFRP). This hybrid CFRP or GFRP and steel strap design is called the second generation of the steel-free concrete bridge deck. The hybrid system limits the width of any longitudinal cracks that develop and eliminates corrosion from within the deck slab. All three segments were tested under cyclic loads of 222 and 588 kN to investigate fatigue behavior. The second bridge deck comprises an internal panel and two cantilevers and also incorporates a complete civionics system. The static tests outlined in this paper are useful in the development of the fatigue theory, which was derived from the fatigue testing of the first bridge deck.Key words: steel-free, cantilever, fatigue testing, static testing, glass-fibre-reinforced polymer, carbon-fibre-reinforced polymer, civionics.

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Free vibration and inherent material damping characteristics of boron-FRP plate: influence of non-uniform uniaxial edge loads

International Journal for Simulation and Multidisciplinary Design Optimization ◽

10.1051/smdo/2021017 ◽

2021 ◽

Vol 12 ◽

pp. 18

Author(s):

Vijay Gunasekaran ◽

Jeyaraj Pitchaimani ◽

Lenin Babu Mailan Chinnapandi

Keyword(s):

Free Vibration ◽

Strain Energy ◽

Analytical Investigation ◽

Vibration Response ◽

Buckling Load ◽

Material Damping ◽

Damping Characteristics ◽

Reinforced Polymer ◽

Fibre Reinforced Polymer ◽

Free Vibration Response

The current investigation presents the analytical investigation on free vibration and inherent material damping of boron-FRP plate, subjected to non-uniform uniaxial edge loads. Initially critical buckling load (Pcr) is obtained, then followed by free vibration response and inherent material damping values for corresponding modal indices of the FRP plate is calculated for different load fraction of non-uniform uniaxial edge loads. The buckling load and free vibration response are obtained by using strain energy method and Reddy's TSDT respectively. It is observed that the nature of load and aspect ratio influence the bucking, free vibration and inherent material damping behaviour of the fibre reinforced polymer plate significantly.

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Flexural Performance of a Hybrid Bridge Deck with Pultruded Fibre Reinforced Polymer Composite Sandwich Panels

The Baltic Journal of Road and Bridge Engineering ◽

10.7250/bjrbe.2018-13.411 ◽

2018 ◽

Vol 13 (3) ◽

pp. 165-191 ◽

Cited By ~ 1

Author(s):

Lei Wu ◽

Yujun Qi ◽

Weiqing Liu

Keyword(s):

Working Conditions ◽

Bridge Deck ◽

Composite Sandwich ◽

Four Point Bending ◽

Reinforced Polymer ◽

Hybrid Bridge ◽

Service Load ◽

Fibre Reinforced Polymer ◽

Wheel Loading ◽

Eccentric Wheel

Hybrid bridge decks with the pultruded fibre reinforced polymer have advantageous properties but easily crack because of their unsatisfactory transverse strength and shear strength. This study proposed a type of bridge deck composed of innovative pultruded fibre reinforced polymer composite sandwich panels. Using four-point bending tests, concentric wheelloading tests and eccentric wheel-loading tests combined with first-order shear deformation theory, this study investigated the failure mode, flexural capacity, deformation and ductility of hybrid bridge decks under different working conditions. Under four-point bending and concentric wheel loading, the primary failure modes for this hybrid bridge deck were shear failures along the fibre direction and buckling failure of the upper panel. Under eccentric wheel loading, the primary failure mode was a torsional failure due to the eccentric load. The bearing capacities of the hybrid bridge deck under the three working conditions were 3.8, 3.5 and 3.2 times the service load of a Class I vehicle load, respectively. Besides, the hybrid bridge deck remained in the linear elastic stress state at 2.6 times the service load, indicating that this hybrid bridge deck withstands relatively large vehicle overload without visible damage. The ductility values of this hybrid bridge deck under the three working conditions were 1.79, 2.09 and 2.00, respectively, which are higher than the values for an ordinary pultruded bridge deck. Therefore, the proposed design has the relatively good energy-dissipating capacity, which improves the emergency capacity of the bridge deck.

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