LATTICE GIRDERS CONNECTING ELEMENTS BETWEEN PRECAST CONCRETE COMPONENTS AND IN-SITU CONCRETE

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Cordelia Bell
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1 LATTICE GIRDERS CONNECTING ELEMENTS BETWEEN PRECAST CONCRETE COMPONENTS AND IN-SITU CONCRETE

2 LATTICE GIRDERS LATTICE GIRDERS FOR HALF SLABS SPECIAL GIRDERS GIRDERS WITH GERMAN APPROVAL LATTICE GIRDERS WITH THE COMPLETE REINFORCEMENT REQUIRED FOR RESIDENTIAL BUILDINGS Large panel slabs (half slabs) Double walls (precast cavity walls) Rib slabs (Concrete and precast rib slab with clay bricks) Lattice girders are three-dimensional, industrially prefabricated reinforcing elements. They consist of an upper chord and two lower chords and continuous truss wires. These are connected to the chords by means of electric resistance welding. All types of girder are available at short notice if ordered in the appropriate minimum quantities (approx. 10 t). ADVANTAGES OF THE PRODUCT Secures the bonding between precast slabs and in-situ concrete in the final state Load-bearing capacity and serviceability of precast slab when installed Spacer strip for upper reinforcing element Lower chords as flexural tensile reinforcement No diagonal projection on the upper chord side Ample scope of design Welded at all joints Good transfer of shear forces Perfect straightness a bars d1 d2 Upper chord Lower chord d3 H a ba Weight and dimensional tolerances as per ÖNORM B

3 LATTICE GIRDERS FOR HALF SLABS This type of girder is a stocked product and therefore available at short notice. DIMENSIONS Height H Upper Chord d3 d2 Lower Chord d1 Angle of Inclination Factory Length Weight per m Shear Resistance V Rds /z Internal Forces at Assembly Permissible Buckling Moment of Upper Chord V Rds = (A SW /s) z f ywd (cot + cot ) sin... Design value of resistance [kn] of diagonal reinforcement against shear force... Angle of inclination of diagonal wires... Angle of compression struts z... Lever arm of internal forces [m] Permissible Shear Force of mm mm mm mm m kg/m kn/m knm/ kn/ ( cot ) ( cot ) ( cot ) ( cot ) ( cot ) ( cot ) ( cot ) ( cot ) ( cot ) ( cot ) ( cot ) ,0 5,0 5,0 67,4 14,0 1,50 78,8 (0,416 + cot ) 2,06 2, ,0 5,0 5,0 68,2 12,0 1,53 79,3 (0,400 + cot ) 2,15 2,16 3

4 SPECIAL GIRDERS Special girders are manufactured on individual customer demands. DIMENSIONS, CROSS SECTIONS Heights H Upper Chord d3 d1 d2 Spacing of Bars a Bottom Width ba Supply Lengths mm mm mm mm mm mm ca. 80 Factory lengths m or fixed lengths in increments of 100 mm STEEL CHARACTERISTICS FOR TRUSS GIRDERS ACCORDING TO ÖNORM B 4707 Component Yield Strength Ratio of Tensile Strength/Yield Strength* N/mm 2 N/mm 2 : reinforcing steel B550A ribbed Upper Chord: B500A smooth or B550A ribbed : B500A smooth or B550A ribbed / / * for d = 5.0 to 5.5 mm, ratio of tensile strength/yield strength of 1.03 applies. No proof required for d < 5 mm GIRDERS WITH GERMAN APPROVAL The truss girders with German technical approval by DIBt include ALD truss girders for precast slabs with structural in-situ concrete layer and ALW truss girders for slab walls. Component Yield Strength Ratio of Tensile Strength/Yield Strength N/mm 2 N/mm 2 : reinforcing steel B500A ribbed Upper Chord: B500A smooth or B500A ribbed : B500A smooth or B500A ribbed

5 LATTICE GIRDERS WITH THE COMPLETE REINFORCEMENT REQUIRED FOR RESIDENTIAL BUILDINGS Lattice girders with the complete reinforcement required for residential buildings are a special form of truss girder. The lower chord already contains the complete reinforcement for floor loads commonly found in residential buildings. Additional reinforcing elements are required for wider spans and heavier loads. Delivery in sets of 50 is in lengths of 1.20 m to 6.80 m, with a girder height of 150 mm, and 5.60 m to 8.00 m, with a girder height of 190 mm. Length increments are 20 cm. 200 Ø 8 OG B500A SHEAR RESISTANCE OF GIRDER DIAGONALS UG B550A Ø 5 B500A 56.3 (62.2 ) 150 (190) Height Shear Resistance V Rds /z 150 mm 71.0 ( cot ) Dimensions in mm 200 approx mm 75.5 ( cot ) PRODUCT RANGE WITH HEIGHT OF 150 MM Length Diameter Cross-section Weight m mm cm 2 kg/m INTERNAL FORCES AT ASSEMBLY Height Permissible Buckling Moment of Upper Chord (knm/) Permissible Shear Force of (kn/) PRODUCT RANGE WITH HEIGHT OF 190 MM Length Diameter Cross-section Weight m mm cm 2 kg/m

6 studiobleifrei.at For any information about availability and price of our products, please contact our sales department. ALPENLÄNDISCHE VEREDELUNGS-INDUSTRIE GESELLSCHAFT M.B.H. Gustinus-Ambrosi-Straße Raaba-Grambach/Austria T F avi-verkauf@avi.at Lattice s-01/ e

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