Diaphragm collector design example. 10. It uses a four-story concrete building as an example, calculating can create challenging design conditions. This document summarizes a presentation on seismic design of reinforced concrete diaphragms. At lines where exterior horizontal loads are introduced into the diaphragm, a sufficient number of fasteners should be provided to transfer the load from structure up to the diaphragm. Comprehensive guide to diaphragm design per ASCE 7-16 including diaphragm classification, forces, chord and collector design, deflection checks, and a complete example problem. If the wall along axis B must transfer a large force through the podium diaphragm to the basement wall This document provides a summary and example of designing diaphragms, chords, and collectors for a four-story concrete building based on 2006 IBC and Diaphragm Design Forces 4-1 6. Diaphragm Design Presentation Outline – Part 2 Example one-story RWFD building with steel deck diaphragm Section 12. Analysis of traditional and alternative approaches. Consequently, many aspects of diaphragm design are left open to interpretation and engineering judgment. The “Will” vs. 1 and 12. 5 Strut-and-Tie Models 6. 6 Finite Element Models 6-15 6-15 He Provisions Update Committee – Issue Team 6 that focused on the determination of diaphragm seismic design force levels and the design of diaphragms of many materials, including cast-in-place The unifying concept behind both alternative diaphragm design methods is the recognition of the diaphragm system’s influence on the seismic response and performance of the diaphragm and, in A comparison of collector design methods for concrete diaphragms in earthquake engineering. Allows for the extraction of diaphragm forces without having to define explicit section cuts. Provides explicit modeling of collectors to assist Further Study A presentation by Dr. The writers of this Guide consulted widely with code writers and practicing engineers to Where diaphragms are designated as rigid or semi-rigid for modeling and design, the process of seismic design will start with overall modeling of the building and then proceed to diaphragm design. May 10, 2025 3 min read Updated: May 13, 2025 “Seismic design of cast-in-place concrete diaphragms, chords, and collectors: a guide for practicing engineers,” NEHRP Seismic Design Technical Brief No. 4 20 Diaphragms, Chords, and Collectors Collector Design – SDC B Third Floor Diaphragm Collector Design: • Determine axial force (k) distribution in collector: Structural Engineering All edges of a diaphragm shall be supported by a boundary element (chord, strut, collector) or other vertical lateral force resisting element (shear wall, frame). This document provides a guide to designing diaphragms, chords, and collectors based on 2006 IBC and ASCE/SEI 7-05 codes. the “Why” By This example illustrates the design of a large flexible diaphragm in a big-box retail store subjected to lateral seismic loading. 102 Traditional Design Method Section 12. Shows simple and difficult calculations. 3, produced by the NEHRP Developing Diaphragm Analysis By John A. Themaximum end reaction (R) of Diaphragm Design Calculation Sheet – Collector and Shear Checks As ACI318-19 Adisorn O. The roof structure consists of a panelized hybrid roof system, which . David Fanella at CRSI provides a brief information how to design the diaphragm. The document is a presentation on seismic design of steel connections. Kennedy, SE, PE Diaphragm analysis, design and connection considerations in steel seismic force-resisting systems. Lines 1 and 6: Example from previous videos continued to calculate collector forces. It discusses diaphragms, collectors, and chords, which transfer loads The shear diagram is used in (1) checking the design shear strength of the diaphragm, (2) designing the connections of the diaphragm to the vertical elements of the LFRS, and (3) Explore a detailed concrete diaphragm design example for a four-story building, covering seismic design categories, irregularities, and collector Diaphragm Design (continued) Determine maximum linear diaphragm shear The linear diaphragm shear equals the wall shear divided by the wall length. The value given for R for A2 and D2 is wrong ( Diaphragm Design Presentation Outline – Part 2 Brief overview of diaphragm seismic design methods Example one-story RWFD building with steel deck diaphragm Section 12. Consider the idealized example in Figure 16. This example illustrates the design of concrete diaphragms, chords and collec tors for a four-story office building with vertical and horizontal irregularities in accordance with the provisions of the 2012 In Provides a graphical representation of the diaphragm load path. 1 and For the roof in this example, the total uniform load on the diaphragm equals the combined effects of the windward and leeward cladding reactions (ww + wL).
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