bridge deck replacement contracts in illinois that included precast, prestressed concrete ppc deck planks. metal stay-in-place forms used in one of the contracts is also briefly addressed in this report. ppc deck planks, a type of stay-in-place form used in construction of bridge decks, could speed construction of a bridge deck.
deck panels for these bridges were cast full width in sections approximately 1.2 m 4 ft wide. the panels were prestressed in the transverse direc tion of the bridge and were posttensioned in the longitudinal direction after erection. composite action between the deck and the supporting members was not developed.
the type of reinforced or prestressed concrete bridge deck depends mainly on the functional requirements, the structural form, and the main span length of the construction. precast or cast in situ reinforced concrete r.c. bridge decks can be practically applied for all structural types, like arch, cable-stayed, extradosed, and even suspension bridges with a majority of girder bridges.
this paper proposes a prestressed fibre-reinforced polymer frp shell for composite bridge deck with frp and concrete. geometric parameters including cross-section shape, arch radius and number of arches were first optimised by the finite element fe method. a self-balancing prestressed basalt frp
design guides 3.5 - lrfd ppc deck beam design page 3.4-4 may 2019 in which: pt = wsolid wnet cos skew 2 ft. where: mb = bending moment due to beam self weight kip-ft. wnet = weight per unit length of the section of the beam with voids kip/ft.
design step 4 design of deck prestressed concrete bridge design example. task order dtfh61-02-t-63032 4-5. future wearing surface: minimum = 0.65 maximum = 1.5. it is not intended to maximize the load effects by applying the maximum load factors to some bays of the deck and the minimum load factors to others.
precast and prestressed concrete composite bridge deck panels are used with cast-in-place concrete to provide a convenient and cost effective method of construction for concrete bridge decks. the panels are usually precast at a manufacturing plant. they are trucked to the bridge construction site and lifted by cranes onto concrete or steel girders.
girder bridge, or a continuous reinforced-concrete slab bridge on a superelevation transition. screed elevations, if not shown on the plans, shall be provided in tabular form on letter-size sheets. this information shall include a diagram or table showing the elevations at the top of the concrete deck that are required before the concrete is placed.
currently, ldg inspects 72 of these structures on an annual basis, using specific inspection criteria and descriptions for prestressed non-composite adjacent box beams. most of these bridges have a superstructure rating of 4 poor condition or less, which identifies the bridge as structurally deficient.
fig.10: prestressed subdeck panel for bridges. precast and prestress deck slabs for bridge construction. generally, decks are the first bridge element that damaged or deteriorated and hence need strengthening. if the deck bridge is need strengthening or replacement and the traffic is high, it is recommended to do the work during the off peak period.
the shrinkage of the pretensioned beams is different from the shrinkage of the deck slab. this is due to the difference in the age, concrete strength, and method of curing of the two concretes. unlike creep, differential shrinkage induces stresses in all prestressed composite beams, including simple spans.
composite precast beam and deck bridge - midas civil online training midas civil engineering. multi-span integral prestressed bridge design to eurocode composite precast beam and deck bridge
it is possible to influence the load carried by a composite deck section in a number of ways during the erection of a bridge. by propping the steel beams while the deck slab is cast and until it has gained strength, then the composite section can be considered to take the whole of the dead load.
the upper deck is 42 m wide and carries a dual four-lane superhighway, and the lower deck carries six lanes of local roads. transversely the deck consists of a prestressed steel concrete composite frame structure spanning from the outer stay locations and supporting the longitudinal trusses figure 11.3 .
two-way prestressed concrete bridge deck is expected to be crack-free for the service life of the bridge, an advantage that is not practical to achieve with cip decks. weight reduction . the dead load of the bridge deck is a significant portion of the design load for a bridge, especially for longer span structures. reducing the weight of the full-
a prestressed composite box girder with steel-plate webs is a hybrid between a pc box girder and a non-prestressed steel-composite deck that takes the best from the two technologies.
the properties of prestressed bfrp strips are critical to evaluating the behaviors of a self-balancing composite bridge deck. the strain of the prestressed strips is the superposition of the initial strain after concrete casting and strain increment during loading.
the typical multi -girder steel-concrete composite bridge, which consists of a number of steel girders with bracing in between and a slab on top, and a ladder deck bridge, which consists of two main girders with a number of secondary crossgirders in between that support and act with a deck slab.
the standard deck system to be used on adjacent prestressed concrete beams is a 6 inch monolithic deck with epoxy-coated or galvanized reinforcement. the monolithic deck is considered to be an integral wearing surface. the thickness of bridge decks for prestressed concrete box and slab beams may exceed the 6 inch minimum shown on the plans.
pre-tensioned bridge decks types of beams in common use are inverted t-beams, m-beams and y beams. inverted t-beams are generally used for spans between 7 and 16 metres and the voids between the beams are filled with insitu concrete thus forming a solid deck.
the definition of a two span prestressed beam bridge deck is given in example 10.1 and will be used for the basis of this example. the objective of the exercise is to compare the permanent action stresses at the time the bridge is open to traffic 60 days with those at the end of the bridges life.
prestressed concrete girders were covered with pultruded composite deck panels made by diversified structural composites erlanger, ky, us , then composite rebar from hughes bros. inc. seward, ne, us was placed together with a bidirectional pultruded fiberglass bar grid from strongwell on top of the panels.
there are three major forms of construction: solid slab deck infill deck , beam and slab deck, voided bridge deck. solid slab is ideal for short spans with shallow construction depths.
austin prestress. austin prestress aps manufactures engineered prestressed deck panels, prestressed sound and wall panels and concrete traffic barriers. established in 1980, aps has been a pioneer in successfully developing innovative designs in bridge deck and retaining products.
prefabricated beams of steel or prestressed concrete with addition of a reinforced concrete slab to make up some form of composite deck 1 . 4. bridge deck analysis the main categories of bridge deck of concrete construction are illustrated in figure 1. the simplest form of concrete deck is the
a polymer concrete wear surface was added to the top surface of the cured composite, and the deck was bolted to steel support girders. installation was completed in one afternoon, and total deck weight was one-fifth the weight of a steel-reinforced concrete solution.