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2 sie 2024 · EPG 751.22 illustrates the general design procedure for prestressed concrete I girders (Type 2, 3, 4 and 6), bulb-tee girders (Type 7 and 8) and NU girders (NU 35, 43, 53, 63, 70 and 78) using AASHTO LRFD Bridge Design Specifications except as noted.
This volume provides: a) an overview of bracing utilized for I-girders, b) a discussion of the bracing systems for tub girders, and c) design requirements for the members and connections of bracing systems.
With bridge span lengths ranging from 50 ft to 125 ft, the I -girder typically uses a depth- to-span ratio of approximately 0.05 to 0.055 for simple spans and approximately 0.045 to 0.05 for multi -span structures made continuous for live load.
design of a typical three-span continuous straight non-skewed steel I-girder bridge with spans of 140.0 feet – 175.0 feet – 140.0 feet. Specifically, the example illustrates the design of selected critical sections from an exterior girder at the strength, service and fatigue limit states. Constructability checks,
PRESTRESSED CONCRETE I-BEAM TYPE GIRDERS. GENERAL. 1. PURPOSE OF TLSB IS TO PROVIDE A STANDARD METHOD TO MAINTAIN P/S I-BEAMS IN AN UPRIGHT POSITION DURING THE ERECTION PHASE. THE BRACING DETAILS CONTAINED IN THIS STANDARD ARE CONCEPTUAL; THE CONTRACTOR MAY ELECT TO PROVIDE ALTERNATE DETAILS AS APPROPRIATE. 2.
most prevalent girder type for spans in the order of 25 – 36 m. Alternative ‘Wide Flange I-Girders’ now have type approval for designs where spans may be up to 46 m.
Girder spans also range from 15 feet to 45 feet in 5-foot increments for each of the beam spans noted. Therefore, beam/girder depths tabulated cover 28 different bay sizes for each of three load cases. Dead loads address the self-weight of the floor/roof framing system.
