Wood Floor Diaphragm Design
Horizontal loading tests are conducted on three floor diaphragms designed to the same load. Proper performance of floor diaphragms is required to transfer all lateral loads to the vertical systems that.
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FLOOR DIAPHRAGMS IN MULTI-STOREY TIMBER BUILDINGS.
Wood Floor Diaphragm Design. A 20 m x 30 m building has a wood diaphragm on CMU walls as shown in Figure 1. The first part of the Guide presents the terminology concept and design of timber diaphragms with their connections to the lateral load-resisting system LLRS. Seismic Design of Wood Light-Frame Structural Diaphragm Systems.
Both code-referenced standards provide procedures for designing diaphragms for wood construction. This presentation will demystify diaphragm design by providing wind and seismic design examples for in-plane lateral design of wood-and gypsum-sheathed diaphragms including a brief overview of high-load diaphragms. The application of the membrane-to-brace replacement method to diaphragms is also discussed.
DIAPHRAGM DESIGN 21 Loads on timber diaphragms All components of floor diaphragms chords and collectorstrut beams panel elements panel connections and the connection to the LLRS s must be designed to resist nticipated loads all a including wind loads. A shear wall however is a vertical cantilevered diaphragm. Timber laminated veneer lumber wood-based panels metal fasteners and prefabricated wall floor and roof diaphragm elements.
Diaphragm aspect ratio is OK. Such a formula would allow an improved method of predicting diaphragm deflections. The diaphragm is subjected to the wind load applied perpendicular to its long side.
Wood diaphragm on reinforced CMU shearwalls Neylon et al 2013. Seismic design of wood-frame single-family dwellings WFSFD lateral forceresisting systems requires determination of the stiffness of horizontal diaphragms and shearwalls. During design sizes and locations of shearwall openings are often changed altering shearwall stiffness and loads and requiring a significant redesign effort.
Structures using wood-frame shear walls or wood-frame diaphragms to resist wind seismic or other lateral loads shall be designed and constructed in accordance with AFPA SDPWS and the applicable provisions of Sections 2305 2306 and 2307. Diaphragms and shear walls are used in the lateral design of a building the structural system is termed a box sys- tem Shear walls provide reactions for the roof and floor diaphragms and transmit the forces into the foundation. The floors and roof of a building in addition to resisting gravity loads are also generally designed to act as diaphragms.
A horizontal system roof floor or other membrane or horizontal bracing acting to transmit lateral forces to vertical-resisting elements. Accordingly simplified equations for determining the shear forces in diaphragms with openings are derived in this paper. Design of the lateral force resisting system ie shearwalls and diaphragms must be approached from a system design perspective and is addressed in Chapter 6.
The term is usually applied to roofs and floors designed to withstand lateral loads. It will enable design engineers architects and specifiers to use tabulated information relevant for timber construction. This paper discusses the design of timber diaphragms in response to the growing interest in multi-storey commercial timber structures and the lack of guidance or regulations regarding the seismic design of timber diaphragms.
A diaphragm is a flat structural unit acting like a deep thin beam. Diaphragm a flat structural unit acting like a deep thin beam. For an 84 x 34 diaphragm the aspect ratio is 25 3.
The capability to accurately calculate diaphragm stiffness and deflections will enhance the safety and economy of wood diaphragms. Shear Wall a vertical cantilevered diaphragm that is constructed to resist lateral. The second part reviews a design example of a timber-concrete diaphragm and its connections to the LLRS.
Wood structural panel unblocked 31 Wood structural panel blocked 41 Single-layer straight lumber sheathing 21 Single-layer diagonal lumber sheathing 31 Double-layer diagonal lumber sheathing 41. Academic staff at third level colleges. The term diaphragm is usually applied to roofs and floors.
SECTION 2305 GENERAL DESIGN REQUIREMENTS FOR LATERAL FORCE-RESISTING SYSTEMS 23051 General. These construction systems can be used when designing a building for wind or seismic lateral loads. A Guide for Practicing Engineers The seismic force-resisting system SFRS of a building consists of a three-dimensional collection of elements that transmit loads and forces from the point of occurrence to the foundation and supporting soils.
Except that two 3 m x 10 m openings are required in the diaphragm for architectural reasons the rest of the building is the same as in Design Example. Diaphragms are com-monly created by installing wood structural panels over roof or floor supports. Therefore this chapter focuses on structural design that specifies standard dimension lumber and structural wood panels ie plywood and oriented strand board sheathing.
Stiffness of wood diaphragms based on the formulas currently used in cold-formed steel design.
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