2 edition of Concrete bridge decks with isotropic reinforcing found in the catalog.
Concrete bridge decks with isotropic reinforcing
Eric W. Brooks
|Other titles||Final report, OR-EF-99-06.|
|Statement||by Eric W. Brooks.|
|Contributions||Oregon. Dept. of Transportation. Research Unit., United States. Federal Highway Administration.|
|The Physical Object|
|Pagination||35 p. in various pagings :|
|Number of Pages||35|
Three reinforcing arrangements for the noncomposite concrete deck are studied: (1) orthotropic steel reinforcement (AASHTO); (2) isotropic steel reinforcement (Ontario ); and (3) “isotropic%” minimum steel reinforcement. Flexural steel and concrete strain measurements in the “beam” deck strip models are compared with those in. Concrete Decks from Bridge Girders With ever tightening budgets and limitations of demolition equipment, states are looking for cost-effective, reliable, and sustainable methods break the reinforcing concrete, so it was not found to be an effective deck removal method. Currently allowed deck removal methods for steel I-girders.
1. Reinforced Concrete Deck Girder Bridge (RCDG Bridge) 2. Materials for Construction 3. Girder / Beam Bridge The most common and basic type. Consists of a horizontal beam supported at each end by piers. The weight of the beam pushes straight down on the piers. 4. Typical Beam / Girder Bridge 5. Girder / Beam Bridge The farther apart its piers. Prestressed concrete decks are commonly used for bridges with spans between 25m and m and provide economic, durable and aesthetic solutions in most situations where bridges are needed. Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice.
BRIDGE CONSTRUCTION MANUAL November 1, Curing materials (burlap, plastic curing blankets, etc.) should be at the site in sufficient quantity to cover the placement. It is very difficult to adequately seal concrete with curing blankets when dowels or other reinforcement bars project from the surface. It may be necessary to. When we consider concrete bridges and/or concrete parts of the bridge we need to think about the worst environments. For an example we can look at the following picture and consider the bridge structures environment: extreme temperature changes, water, river current forces, de-icing salt on bridge deck, road wear etc.
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Deck Reinforcement Design Isotropic Decks The design of isotropic reinforced decks is based on empirical results that show reinforced concrete bridge decks develop an arching action between girders and fail in punching shear rather than flexure when subjected to loads that are significantly higher than factored design Size: KB.
PERFORMANCE OF CONCRETE BRIDGE DECK SLABS USING ISOTROPIC AND STANDARD AASHTO PROCEDURES. This report describes the work done with alternate means of designing deck slabs by reducing the amount of reinforcement, without sacrificing the integrity of serviceability and strength of the decks, which could result in considerable cost reduction and efficient by: 1.
Get this from a library. Reinforcement for concrete bridge decks. [David B Beal; New York (State). Engineering Research and Development Bureau.; United States. Federal Highway Administration.] -- Laboratory tests of reduced-scale bridge decks and field tests of full-scale decks were performed to demonstrate the strength and serviceability of isotropic reinforcement.
Exodermic bridge deck: This combines a reinforced concrete slab on top of, and composite with, a steel grid. Exodermic decks are made composite with the steel superstructure with headed studs welded to stringers, floor beams, and main girders through blackouts in the precast concrete.
Orthotropic decks: Rebars allow two-way bending and load. Tests were conducted on 1/‐scale reinforced‐concrete bridge deck slabs under static load, pulsating load applied at a fixed point, and moving constant wheel‐load. Both isotropic and orthotropic reinforcing arrangements were considered.
The current AASHTO design approach (orthotropic reinforcement) appears to be by: • The specified day strength of the deck concrete is not less than 28MPa Yes • The deck is made composite with the supporting structural components Yes Select Reinforcement The slab configuration satisfies the necessary design conditions.
The slab must be reinforced with four layers of isotropic reinforcement. Concrete bridge barriers are installed as road safety facilities to prevent vehicles or pedestrians on the road from exiting the lane or entering the. in SectionTimber Bridges. All other types of bridge decks will be rated in compliance with the applicable guidelines within this manual and the AASHTO code.
Hand computations will be acceptable. For reinforced concrete slabs with main reinforcement parallel to traffic, see Section - Concrete Bridges, for rating directions.
Reinforcing Bar Size. The minimum reinforcing steel size used for bridge deck reinforcement is a #4 bar. Sacrificial Wearing Surface. The 2½-in top reinforcement concrete cover includes ½ in that is considered sacrificial.
For both the deck and superstructure, its weight shall be. protective” bridge deck repairs for isolated locations are to be designed, detailed and constructed with the same methods and details used for “protective” bridge deck rehabilitations of monolithic bridge decks (see Subsection ) and two course bridge decks (see Subsection ).
The behavior of two reduced-scale concrete bridge decks subjected to simulated wheel loads was evaluated in a series of tests.
One slab was reinforced in accordance with American Association of State Highway and Transportation Officials requirements and the other had three areas with varying amounts of isotropic reinforcement. 7C h a p t e r 2 Reinforced concrete structures such as bridge decks and pil- lars, highways, and other infrastructure facilities experience loss of integrity over time because of poor initial quality, damage from deicing salts, overloading, freezeâ thaw cycle- induced stresses, fatigue, and, above all, corrosion of rebars (Figure ).
AASHTO deck and from mm ( in) to mm ( in) on the isotropic deck. The isotropic deck also contained center longitudinal cracks about mm ( in) wide.
Four large cracks were present on the isotropic deck. Three of the four appeared at the midpoints of bay 6, bay 8, and ba y 19 and had widths of mm ( in). sons.
This chapter will emphasize cast-in-place reinforced concrete decks, including a design exam-ple. The alternative deck types will be discussed in less detail later in the chapter.
Cast-in-Place Reinforced Concrete The extensive use of cast-in-place concrete bridge decks is due to several reasons including cost. Longitudinally reinforced slab bridges have the simplest superstructure conﬁguration and the neatest appearance.
They generally require more reinforcing steel and structural concrete than do girder-type FIGURE Typical stress–strain curves for steel reinforcement. FIGURE Typical reinforced concrete sections in bridge superstructures. Abstract: The shortest span reinforced concrete decks are built as solid slabs.
These may be supported on bearings although, due to durability issues with expansion joints and bearings, it is usually preferable to cast them integral with in-situ abutments or. concrete bridge decks with corrosion-resistant reinforcing (CRR) bars.
A two-phase experimental program was conducted where a control test set consistent with a typical Virginia Department of Transportation bridge deck design using Grade 60 steel (ASTM A, fy = 60 ksi) and epoxy-coated reinforcing steel was compared to deck slab specimens where.
• BS Part 4: Code of Practice for the Design of Concrete Bridges • BS Concrete - Complementary British Standard to BS EN • BS Specification for scheduling, dimensioning, bending and cutting of steel reinforcement for concrete Design Manual for Roads and Bridges • BA Early Thermal Cracking of Concrete • BD 33 CAUSES OF CRACKING IN CONCRETE BRIDGE DECKS Inthe Portland Cement Association began a study of concrete bridge deck durability (Durability of Concrete Bridge Decks ).
The study included a survey of 1, bridges selected at random in 8 states, plus a detailed sur- vey of 70 bridges in 4 states. concern in reinforced concrete bridge deck slabs, the noncorrosive fiber-reinforced polymer (FRP) composite bars provide an excellent segment contained isotropic steel reinforcement in two.
isotropic decks uses two mats of #4 reinforcing bars spaced at 8 inches in both directions. MDOT sponsored a research project to investigate the analysis procedures and load rating for isotropic decks in Field testing and Finite Element Analysis (FEA) were used to investigate isotropic decks supported by steel and prestressed concrete.Bridge Deck Concrete Placement Checklist – see Spec.
Revised 6/ Day 6 7% strength gained for a total of 68%. Note: A 7 day wet cure is required on decks! This starts when the last curing protection is inplace. If control cylinders are used, there is a minimum of 96 hours.
Note: Must be surface moist through the 7 day curing period.Concrete bridge decks should be designed to transfer the load in a two-way action. Experimental results show that the two-way slab action in the decks changes to a one-way action (transverse direction) as fatigue damage due to a moving wheel-load accumulates.
It is recommended to adopt an isotropic steel reinforcing pattern.