DESIGN OF COMPOSITE BEAMS WITH FORMED METAL DECK

THE AISC SPECIFICATION FOR BUILDINGS DOES NOT PROVIDE FOR COMPOSITE BEAMS WITH A FORMED METAL DECK BETWEEN THE STEEL AND CONCRETE SLAB. WHEN THE METAL DECK CORRUGATIONS ARE PARALLEL TO THE BEAM, THEY DO NOT INTERFERE WITH THE STEEL-CONCRETE INTERACTION AND THE CONDITION IS SIMILAR TO A HAUNCHED SLAB FOR WHICH THE SPECIFICATION PROVISIONS ARE APPLICABLE. HOWEVER, WHEN THE METAL DECK IS PLACED PERPENDICULAR TO THE STEEL BEAMS AND SHEAR CONNECTORS ARE PLACED IN THE RIBS OF THE CORRUGATIONS, THE BEHAVIOR OF THE COMPOSITE SYSTEM MAY DIFFER SUBSTANTIALLY FROM THE EXPECTED BEHAVIOR. STUDIES INDICATE THAT ALL CORRUGATIONS HAVE LITTLE OR NO INFLUENCE ON BEAM BEHAVIOR AND THAT BEAMS COULD BE DESIGNED AS THOUGH THE SLABS WERE SOLID. TESTS ON COMPOSITE BEAMS WITH RIBS UP TO 1 AND 1/2 INCH, ARE SUMMARIZED IN THE FIGURE. WITH INCREASING RIB HEIGHT, THE FLEXURAL CAPACITY OF THE BEAMS WAS DECREASED AS A RESULT OF THE REDUCTION IN SHEAR CONNECTION STRENGTH. THE REDUCTION IN FLEXURAL CAPACITY IS ANALOGOUS TO THE REDUCTION OBSERVED IN CONVENTIONAL COMPOSITE BEAMS WHEN PARTIAL SHEAR CONNECTION IS AVAILABLE. THIS REDUCED FLEXURAL CAPACITY CAN BE DETERMINED WHEN THE STRENGTH OF THE SHEAR CONNECTION IS KNOWN. THE SLAB WIDTH AND CONNECTOR SIZE AFFECT THE CONNECTORS STRENGTH. THE FLEXIBILITY OF THE SHEAR CONNECTOR HAS SOME EFFECT ON THE BEHAVIOR OF THE RIB AND ITS ABILITY TO RESIST SHEAR. TENTATIVE DESIGN RECOMMENDATIONS ARE PRESENTED FOR COMPOSITE BEAMS WITH FORMED METAL DECK UP TO 3 IN. HIGH.

• Supplemental Notes:
  • Vol 7, No 3, PP 88-96, 7 FIG, 17 REF
• Authors:
  • Fisher, J W
• Publication Date: 1970-7

Media Info

• Serial:
  • Engineering J, Am Inst Steel Constr

Subject/Index Terms

• TRT Terms: Beams; Bridge decks; Composite materials; Concrete tests; Corrugations (Defects); Design; Fasteners; Flexibility; Flexural strength; Shear reinforcement; Structural tests
• Uncontrolled Terms: Composite beams; Shear connectors
• Old TRIS Terms: Metal decks
• Subject Areas: Bridges and other structures; Design; Highways;

Filing Info

• Accession Number: 00209328
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 19 1970 12:00AM