Structural · S-D9MW5

Bottom Chord Reinforcing at Equipment Support

Materials

Steel

Elements

Beams Roofs Floors / Slabs Decks Arches Connections / Plates Reinforcing

Connections

Welded Connection Bolted Connection Deck Attachment Timber / Mass-Timber Connection

About this detail

Steel joist bottom chord reinforcing is configured for MEP and architectural equipment support. L4x4x5/16 angles extend between joists to support hanger rods, located within four inches of the joist panel point or utilizing a C8x11.5 channel spanning between panel points where offset is necessary. One-half inch diameter bolts with plate washers connect between the joist angles, while secondary support members span adjacent joists to distribute concentrated loads equally from both chord members and avoid torsion.

L4x4x5/16. EXTEND BETWEEN JOISTS TO SUPPORT HANGER RODS. ANGLES SHALL BE LOCATED AS CLOSE AS POSSIBLE TO JOIST PANEL POINT (4" MAX). L4x4x5/16. EXTEND BETWEEN JOISTS TO SUPPORT HANGER RODS. WHERE ANGLE CANNOT BE LOCATED WITHIN 4" OF JOIST PANEL POINT, PROVIDE C8x11.5 AS SHOWN AND EXTEND C8 BETWEEN JOIST PANEL POINTS. 1/2"Ø BOLTS BETWEEN JOIST ANGLES W/ PL WASHERS STEEL ROOF DECK SEE PLAN STEEL JOISTS SEE PLAN 3/16 2 PANEL POINT, TYP (2) L1 1/4x1 1/4x3/16 (SEE NOTE 3) MEP/ARCH COMPONENT SUPPORTED FROM JOIST, TYP ROOF DECK 1/8 1" MIN NOTE 2 4"+ 4"+ 4" MAX JOIST CHORD MEMBERS SECONDARY SUPPORT MEMBER SPANNING TO ADJACENT JOIST (SEE NOTE 4) TYP JOIST PANEL NOTES: 1. MAXIMUM POINT LOAD OF MECHANICAL, ELECTRICAL, PLUMBING, AND ARCHITECTURAL COMPONENTS SUPPORTED FROM JOIST SHALL NOT EXCEED 200 LBS. POINT LOADS MUST BE SPACED A MINIMUM OF 4 FEET APART OR ONE PER JOIST PANEL, WHICHEVER PRODUCES THE GREATER DISTANCE. CONSULT STRUCTURAL ENGINEER OF RECORD IF POINT LOADS EXCEED THESE REQUIREMENTS. 2. ALL CONCENTRATED LOADS TO STEEL JOISTS EXCEEDING 100 LBS SHALL BE CONNECTED WITHIN 4 INCHES OF THE JOIST TOP OR BOTTOM PANEL POINT. PROVIDE DIAGONAL ANGLES WHERE CONCENTRATED LOAD EXCEEDS 100 LBS AND IS NOT WITHIN 4 INCHES OF A TOP OR BOTTOM CHORD PANEL POINT. WELD ANGLE TO JOIST CHORD MEMBERS. 3. HANGERS MUST BE SUPPORTED EQUALLY FROM BOTH CHORD MEMBERS SO NOT TO INDUCE TORSION INTO THE CHORD MEMBER. CONTRACTOR IS RESPONSIBLE TO SELECT THE TYPE OF HANGER AND CONNECTION TO JOIST. SEE ADDITIONAL HANGER REQUIREMENTS IN MECHANICAL, ELECTRICAL, AND PLUMBING SPECIFICATIONS. 4. WHEN COMPONENTS SPAN PARALLEL TO JOISTS, PROVIDE SECONDARY SUPPORT MEMBERS TO DISTRIBUTE THE LOAD INTO A MINIMUM OF (2) JOISTS. MAXIMUM POINT LOAD VALUES CANNOT EXCEED THE VALUES LISTED IN NOTE 1. SECONDARY SUPPORT MEMBERS MUST BE SUPPORTED FROM BOTH ANGLES OF CHORD MEMBERS. CONTRACTOR IS RESPONSIBLE FOR DESIGN OF SECONDARY SUPPORT MEMBERS. 5. SEE GENERAL STRUCTURAL NOTES SHEET FOR HANGER CONNECTION LIMITATIONS TO STEEL ROOF DECK. FLOOR SLAB TYP JOIST PANEL NTS 5 BOTTOM CHORD REINFORCING AT EQUIPMENT SUPPORT NTS 6 STEEL JOIST HANGER REQUIREMENTS

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