Bridge Near Karkhano Market
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Bridge near Karkhano Market: Bridge loading = HS20-44 Bridge Geometry: Superstructure type: Reinforced concrete deck supported on single span pre-stressed girders. Span: Single span = 54ft. Width of roadway = 24ft. (Two lanes, 12’-0” wide each) Walkway on one side = 4ft. Railing: R.C types, 1’-0” wide at base on each side. Girder’s spacing = 8’-0” on centers Girder type/size: I-shaped, 36in. deep, 24in. wide top flange and 28in. wide bottom flange with 8in. thick slab. Bridge sub-structure: R.C abutments supported on spread footings founded on solid below scour depth having allowable bearing capacity of 1.00 ton/sft. (Refer to geotechnical report prepared by GSK Engineering) Overhang deck: 3’-0” from the centerline of the exterior girder to the end of the overhang. Intermediate diaphragms: Two diaphragms 10in. wide and 30in. deep at third points of the span in addition to the end diaphragms of the mentioned size. Materials: A. Concrete Prestressed girders: Minimum 28-days cylinder strength fc’ = 6 ksi Deck slab, Railing: Minimum 28-days cylinder strength fc’ = 4 ksi Sub-structure (abutments, footing): Minimum 28-days cylinder strength fc’ = 3 ksi B. Reinforcing steel Grade 60, deformed steel bars conforming to ASTM – A615 having yield strength, fy = 60 ksi
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Transcript of Bridge Near Karkhano Market
Bridge near Karkhano Market:Bridge loading = HS20-44Bridge Geometry:Superstructure type: Reinforced concrete deck supported on single span pre-stressed girders.Span: Single span = 54ft.Width of roadway = 24ft. (Two lanes, 12-0 wide each)Walkway on one side = 4ft.Railing: R.C types, 1-0 wide at base on each side.Girders spacing = 8-0 on centersGirder type/size: I-shaped, 36in. deep, 24in. wide top flange and 28in. wide bottom flange with 8in. thick slab.Bridge sub-structure:R.C abutments supported on spread footings founded on solid below scour depth having allowable bearing capacity of 1.00 ton/sft. (Refer to geotechnical report prepared by GSK Engineering)Overhang deck: 3-0 from the centerline of the exterior girder to the end of the overhang.Intermediate diaphragms: Two diaphragms 10in. wide and 30in. deep at third points of the span in addition to the end diaphragms of the mentioned size.Materials:A. ConcretePrestressed girders: Minimum 28-days cylinder strength fc = 6 ksiDeck slab, Railing: Minimum 28-days cylinder strength fc = 4 ksiSub-structure (abutments, footing): Minimum 28-days cylinder strength fc = 3 ksiB. Reinforcing steelGrade 60, deformed steel bars conforming to ASTM A615 having yield strength, fy = 60 ksiC. Prestressing steelPrestressing steel shall be dia T wires low relaxation strands grade-270 conforming to ASTM 416.Strands Arrangement:Draped bonded strands, 10 strands/duct.
