What Is Seismic Design for Tilt-Up Buildings?
Tilt-up seismic (the concrete panels' — the cast; the diaphragm's — the flexible) designs the panel-to-diaphragm (the connections — the out-of-plane; the ledger's), the in-plane (the shear walls — the panels'), and the continuity (the ties — the across). The design: the ASCE 7's — the anchorage (the 0.4SDSIeWp); the panels' — the slender's; the detailing's — the ductile. The warehouse's — the seismic's workhorse.
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The panel's forces
The out-of-plane (the 0.4SDSIeWp — the anchorage's; the slender's — the P-delta), the in-plane (the shear — the wall's; the panels'), and the diaphragm's (the flexible — the wood/steel's; the Fpx).
The connections
The ledger (the angle's — the bolted; the diaphragm's — the tied), the panel-to-panel (the chords' — the welded; the embedded), the foundation (the dowels' — the base's; the shear's), and the continuity (the ties — the across; the 12.1.3's).
Detailing and retrofit
The slender (the h/t — the 50's; the P-delta's), the subdiaphragm (the 300-foot — the ratio's; the cross-ties'), the retrofit (the 1994 Northridge's — the lesson; the weak — the strengthened), and the SDC D (the special — the detailing's). The tilt-up is the seismic's — the connections designed, the panels standing.
The bottom line
Design tilt-up seismic per ASCE 7 (0.4SDSIeWp panel anchorage, diaphragm ties, subdiaphragms at 300-ft ratios) — detail slender-wall P-delta and ledger connections; retrofit pre-Northridge weak connections.
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