FE Evaluation of Reinforced Concrete Bridge Decks with Glass-FRP Composite Bars

2016 ◽  
Vol 723 ◽  
pp. 776-781 ◽  
Author(s):  
Jian Wei Huang ◽  
Jonathan Davis
Keyword(s):  
Reinforced Concrete ◽  
Bridge Decks ◽  
Three Dimensional ◽  
Steel Corrosion ◽  
Concrete Bridge ◽  
Design Strength ◽  
Gfrp Bars ◽  
Concrete Bridge Decks ◽  
Gfrp Bar

In order to resolve the steel corrosion problem in bridge decks, glass fiber reinforced polymer (GFRP) has been recommended as a substitute to the conventional steel reinforcement in bridge decks. However, the use of GFRP bars in bridge decks is still limited by several concerns, including the long-term durability of GFRP bars in the concrete under sustained loadings. Literature review showed that the tensile strength reduction of the GFRP bar should be governed by the sustained stress level in the GFRP bar. In this regard, a GFRP reinforced concrete deck was simulated in this paper, aiming to investigate the sustained stress levels in the GFRP bars through three dimensional finite element (FE) modeling. Per AASHTO LRFD specifications, one lane loaded and two lane loaded cases were examined to identify the maximum tensile strains in the internal GFRP bars subjected to dead loads and HL-93 design loadings. The FE results showed that the maximum tensile stresses in GFRP bars under service loads were less than 1% of the GFRP design strength, which implied that the GFRP bars could have excellent long-term performance in real concrete bridge decks.

Comparative Evaluation of Crack Width for Reinforced Concrete Bridge Deck

2021 ◽  
Vol 9 (10) ◽  
pp. 59-67
Author(s):  
Shivank Tamrakar
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Bridge Deck ◽  
Constant Width ◽  
Bridge Decks ◽  
Concrete Bridge ◽  
Live Load ◽  
Reinforced Concrete Bridge ◽  
Concrete Bridge Decks ◽  
Reinforcement Bar

Abstract: Cracking in reinforced concrete bridge decks is a massively concern in the India. Many concrete bridge decks, inobservant to the age of construction, have shown different levels and patterns of cracking. Not only does cracking of bridge decks weaken the bridge infrastructure, but also allows the inflow of corrosive agents into the reinforcement. In this study, the crack width evaluation of RC bridge deck of span of 5 m. and 9 m. is based on equations given by IRS Concrete Bridge Code 1997 for different cases like- the effect of depth variation, reinforcement diameter, clear cover, variation in live load moment, spacing of tension reinforcement and different no. of tension reinforcement bar to constant width for the same crosssection. This study concluded that crack width increases with increase in clear cover, variation in live load moment and spacing of tension reinforcement while it decreases with increase in reinforcement diameter, depth of the bridge deck and number of reinforced bars and percentage change evaluation of different parameter of 5m and 9m span bridge deck. Keyword: Crack Width, Cracking, Bridge Deck Slab, Crack Spacing.

scholarly journals Chloride Distribution and Steel Corrosion in a Concrete Bridge after Long-Term Exposure to Natural Marine Environment

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3900 ◽  
Author(s):  
Jun Liu ◽  
Zhilu Jiang ◽  
Yulong Zhao ◽  
Hao Zhou ◽  
Xiaodong Wang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Marine Environment ◽  
Chloride Transport ◽  
Steel Corrosion ◽  
Concrete Bridge ◽  
Reinforced Concrete Structure ◽  
X Ray Diffraction ◽  
Tidal Zone ◽  
X Ray

Chloride-induced steel corrosion is the most concerning issue for the durability of concrete structures. Concrete and steel samples were obtained from a 30-year-old reinforced concrete bridge. The chloride content was measured by a potentiometric titration method and the microstructure of concrete was obtained by scanning electron microscopy and mercury intrusion porosimetry. The rust phases of the steel were detected by X-ray diffraction and Raman analysis. It was found that the convection depth for chloride transport in cracked concrete was significantly larger than that in uncracked concrete. The concrete in a pier column facing upstream had greater porosity due to the water impact and calcium leaching. The coefficients of variability of chloride diffusivity of concrete for the bridge deck and the pier column were significantly different. Rust phases including lepidocrocite, goethite, akaganeite, magnetite, and maghemite were detected using Raman spectroscopy and X-ray diffraction. The major phases of steel rust in the atmospheric zone were lepidocrocite and goethite, while they were lepidocrocite and maghemite in the tidal zone. The results of this study would provide information concerning the chloride-induced steel corrosion under a marine environment in order to predict long-term behaviors of a reinforced concrete structure.

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