the diaphragm construction will also serve as the floor or roof surface and resist gravity, wind uplift, and other loads in addition to the loads associated with earthquakes.
Report 138 Plywood Diaphragms by John R.Tissell, P.E. and James R. Elliott, P.E. since the behavior of plywood sheathing used as roof and floor diaphragms has been well established by previous testing and extensive field use. preframed roof panels, and plywood
constructed with adequate floor and roof diaphragms and shear walls. Specifically, the IBC, IRC, WFCM, and ICC-600 provide prescriptive shear wall details and designs that may be applied when certain basic
Figure 4-1 An unblocked floor diaphragm. FEMA 232, Homebuilders Guide 70 When a floor is supporting more than a roof and one story of wall, the maximum prescriptive cantilever distance is limited by the IRC to the depth of the joist. If longer cantilevers are desired, a registered design professional must design
Offset Roof Planes Roof framing must keep diaphragm in plane Load on diaphragms may be different due to different heights Proportion load rationally . Code Definitions Collector A horizontal diaphragm element parallel and in line with the applied force that collects and transfers
The design of the roof and floor diaphragms begins by deter-mining the lateral loads on the structure which are transferred to each diaphragm. These forces are derived from the applicable building code. Once these forces are derived for both major directions of the
Sample Design Calculations. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet . Calculating the subtotal for the roof, first floor ceiling, and walls. First Floor Including Seven Trustr Level: Each of the components has the following area: Area = Floors: Oak Floor: Subfloor:
Floor and roof diaphragms shall be constructed of wood structural panels attached to wood framing in accordance with Table R602.3 1 or to cold
The IBC doesn't recognize 2x tongue and groove decking we have 2x6's as providing roof diaphragm shear behavior. I've heard in the past that placing Structural I plywood or OSB over the top of the decking can provide the necessary diaphragm action. My questions, however, are this:
The diaphragm of a structure often does double duty as the floor system or roof system in a building, or the deck of a bridge, which simultaneously supports gravity loads. Diaphragms are usually constructed of plywood or oriented strand board in timber construction;
8. Seismic Design of Floor Diaphragms 375 8.1 INTRODUCTION The primary function of floor and roof systems is to support gravity loads and to transfer these loads to other structural members
Diaphragms and Shear Walls Form L350. Design and construction recommendations for engineered diaphragm systems in floor, shear wall, and roof systems.
diaphragm, chord and collector design in accordance with the 2012 IBC. Semi-rigid diaphragm is used to represent the floor and roof diaphragm in the lateral analysis procedure.
Roof and Floor Deck Testing FET provides a variety of testing to the Roof and Floor Deck Industry. From Shear Diaphragm to Uniform Structural Loading, we can perform testing on full scale assemblies to establish the performance values for each product type.
4.5 Procedures for Diaphragms This section provides Tier 2 evaluation procedures that on the diaphragm for lateral support. Any roof, floor, or ceiling can participate in the distribution opening at the edge of a floor may weaken the diaphragm just as a notch in a flange weakens a beam. RIGID DIAPH.
of a building a roof or floor diaphragm, for exam-ple and deliver them to a structural element, such LATERAL-FORCE COLLECTORS for Seismic and Wind-Resistant Framing by Thor Matteson roof diaphragm 120 pounds per foot in this example and
Just as the floor or roof is checked for vertical load capacity, it is considered a diaphragm in the plane of the floor and check for shear when designing the Lateral Force Resisting System. Generally there are two different types of diaphragms.
FLOOR DIAPHRAGMS. Definition and function: A horizontal system roof, floor or other membrane or horizontal bracing acting to transmit lateral forces to vertical-resisting elements. The floors and roof of a building, in addition to resisting gravity loads, are also generally diaphragm is not considered sufficiently stiff to redistribute
for tools to create diaphragm shear strength tables for roof decks using power-actuated fasteners as well as to create complete diaphragm shear strength tables for floor decks.
The Hilti Profis DF Diaphragm Software Version 2.0 calculates diaphragm shear, flexibility factors and uplift resistance for steel deck roof and floor systems. The program is based on the Steel Deck Institute SDI Diaphragm Design Method and incorporates the latest ICC-ES AC43 performance data.