Architectural · A-MS42Q

Fire-Rated Floor Assembly with Open-Web Steel Joist

Materials

Concrete Steel Stainless Steel Stone

Elements

Beams Roofs Floors / Slabs

Connections

Welded Connection Shear Stud / Composite

About this detail

A fire-rated floor assembly consists of a concrete slab over steel floor units, supported by open-web steel joists and a W150 x 30 steel beam. The concrete slab may be normal-density concrete or structural low-density concrete reinforced with 152 x 152 P18.7/P18.7 steel wire fabric. The 38mm deep composite or non-composite steel floor units are welded to supports at 300mm on center and adjacent units are crimped together at 450mm on center. An optional 10mm rib lath is fastened to the bottom chord of the joist using 1.2mm diameter wire spaced not less than 380mm on center along the bottom chord and at every web member. Sprayed-applied fire-resistive material is applied to the steel surfaces, with all spaces between the top flange of the beam and the steel floor units completely filled with the material.

BEAM - W150 x 30, MIN SIZE JOIST - 200 DEEP, OPEN-WEB STEEL JOIST, 13 kg/m MIN SIZE, DESIGNED IN ACCORDANCE WITH THE RELEVANT PROVISIONS OF PART 4 OF THE NATIONAL BUILDING CODE OF CANADA, SPACED 2285mm O.C. MAX. 1. NORMAL - DENSITY OR STRUCTURAL LOW DENSITY CONCRETE NORMAL DENSITY CONCRETE, SAND-GRAVEL, 2420 ± 50 kg/m³, 21 MPa NOM COMPRESSIVE STRENGTH. LOW DENSITY CONCRETE, EXPANDED SHALE, CLAY OR SLATE AGGREATE, 1800 ± 50 kg/m³ DENSITY, 27 MPa NOM COMPRESSIVE STRENGTH OR EXPANDED BLAST FURNACE SLAG AGGREGATE, 1955 ± 50 kg/m³ DENSITY, 20.7 MPa NON COMPRESSIVE STRENGTH 2. WIRE FABRIC 152 x 152 P18.7/P18.7 STEEL WIRE 3. RIB LATH (OPTIONAL) 10mm RIB, 1.8 kg/m³ EXPANDED STEEL. FASTENED TO ONE SIDE OF JOIST USING 1.2mm Ø WIRE, SPACED NOT LESS THAN 380 O.C. ALONG BOTTOM CHORD AND AT EVERY WEB MEMBER. 4. STEEL FLOOR UNITS (CHWXC) COMPOSITE OR NON COMPOSITE FLUTED UNITS, 38mm NOM DEPTH, MIN THICKNESS 0.76mm. WELDED TO SUPPORTS 300mm O.C. ADJACENT UNITES CRIMPED TOGETHER 450mm O.C. 5. SPRAYED-APPLIED FIRE-RESISTIVE MATERIAL (CHWXC) BLAZE-SHIELD, TYPE HP OR BLAZE-SHIELD, TYPE DC/F OR BLAZE SHIELD, TYPE II SPRAY-APPLIED WITH WATER TO A FINAL UNTAMPED THICKNESS AS SHOWN IN THE TABLE BELOW. STEEL SURFACES ARE TO BE FREE OF DIRT, OIL, OR SCALE. ALL SPACES BETWEEN THE TOP FLANGE OF BEAM AND THE STEEL FLOOR UNITS ARE TO BE COMPLETELY FILLED WITH THE MATERIAL. USE OF ADHESIVE IS OPTIONAL. MATERIAL TO HAVE A MIN. AVERAGE DRY DENSITY OF 208 kg/m³ WITH NO INDIVIDUAL DENSITY LESS THAT 176 kg/m³. BLAZE-SHIELD, TYPE HP TO HAVE A MIN. AVERAGE DENSITY OF 352 kg/m³ WITH A MIN INDIVIDUAL VALUE OF 304 kg/m³. FOR METHOD OF DENSITY DETERMINATION, REFER TO 'GENERAL INFORMATION SECTION' HEADING "FIRE RESISTANCE RATINGS". UNRESTRAINED ASSEMBLY RATING, (h) UNRESTRAINED BEAM RATING, (h) SPRAY-APPLIED RESISTIVE MATERIAL THICKNESS, mm STEEL FLOOR UNITS LOW DENSITY CONCRETE NORMAL DENSITY CONCRETE CRESTS VALLEY BEAM JOIST CRESTS VALLEY BEAM JOIST 1-1/2" 1 1 1 2 1-1/2" 1-1/2" 1 1 1 2 1-1/2" 17 10 10 10 10 10 10 10 10 10 10 13 24 40 22 13 21 31 15 31 15 31 15 31 35 24 49 40 13 10 13 23 8 8 13 23 8 8 13 23 13 10 31 38 8 8 21 31 1 2 3 4 4 4 5 5 5 RESTRAINED ASSEMBLY RATING, (h) 3 2 1-1/2 1 - -

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