What Is a Collector Element in Seismic Design?
Collectors (drag struts) gather the diaphragm's shear and drag it to the vertical seismic elements — the beams, the trusses, the slab strips in the load path where the wall or frame doesn't align with the diaphragm's edge. The design: the collector's axial (the tension/compression — the Fpx), the connections (the wall's — the anchorage), and the overstrength (the Omega — the discontinuous). The lateral's load path — the drag completed.
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How collectors work
The drag (the diaphragm's shear — the collected; the strut's — the axial; the wall's — the delivered), the discontinuity (the wall offset — the collector's spanning; the podium's — the transfer), and the diaphragm's (the chord's — the boundary; the collector's — the interior).
Design forces
The Fpx (the diaphragm's — the collector's; the 0.2SDSIw), the overstrength (the Omega0 — the discontinuous vertical; the amplified), the combinations (the seismic — the load's; the special — the detailing), and the stiffness (the relative — the distribution's).
Detailing
The connections (the wall — the dowels; the frame — the beam's; the capacity), the splices (the axial — the tension's; the mechanical), the concrete (the slab — the thickened; the steel's), and the wood (the straps — the nailed; the SDPWS). ASCE 7 12.10 — the diaphragm's; the collector's — the code.
The bottom line
Design collectors (drag struts) for Fpx axial forces with Omega0 overstrength at discontinuities — detail wall/frame connections and splices for the full tension/compression per ASCE 7 12.10.
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