Seismic Steel Detailing Los Angeles — CBC & AISC 341
Moment frames, braced frames, and connection detailing for California Building Code seismic categories — modeled in Tekla with shop-ready drawings for West Coast fabricators.
Los Angeles and the greater Southern California market operate under some of the strictest seismic detailing rules in the United States. Special Moment Frames (SMF), Reduced Beam Section (RBS) connections, and braced-frame gusset plates must be detailed to AISC 341 and CBC expectations before steel reaches fabrication. Total Engineering Consultants embeds seismic connection criteria directly in Tekla models so Los Angeles fabricators receive drawings that match the engineer’s lateral system — not generic connection templates that fail plan check or shop review.
Why is seismic detailing different in Los Angeles?
Seismic detailing specifies connection geometry, weld access, continuity plates, and brace connections that can undergo controlled yielding under earthquake loads — requirements beyond standard gravity-only connection templates.
California Seismic Design Categories D through F trigger heightened scrutiny on connection ductility, strong-column/weak-beam ratios, and bracing connection behavior. Our detailers model these conditions in Tekla before issuing shop drawings so weld preps, bolt pretensioning zones, and stiffener layouts match the engineer’s lateral design intent.
Deliverables included
SMF / IMRF Connections
RBS, continuity plates, and stiffener layouts with weld symbols meeting AISC 341 detailing conventions.
Braced Frame Packages
Chevron, X-bracing, and BRB connections with gusset plates sized for expected drift and access.
Shop & Erection Drawings
Piece-marked sheets with seismic notes, inspection hold points, and NC1 exports from Tekla.
Model-Based RFIs
3D views attached to RFIs so engineers resolve seismic connection conflicts before fabrication release.
Detailing for Southern California seismic systems
Moment-resisting frames in Los Angeles often require RBS (“dogbone”) cuts, continuity plates, and demand-critical weld details. We coordinate panel zones with the engineer before detailing shop sheets, reducing costly shop revisions when special inspection questions arise.
Chevron and eccentrically braced frames appear throughout mid-rise commercial and residential podium projects. We detail gusset plates, brace end connections, and link beams with clear field bolt access — a recurring LA jobsite constraint when scaffolding is tight on infill sites.
Modular and podium wood-over-steel construction in Southern California still relies on well-detailed steel transfer levels. We model transfer girders, concentrated reactions, and embed layouts so post-tensioned slab vendors and steel fabricators share a single coordinated baseline.
California Building Code & AISC seismic provisions
The CBC adopts ASCE 7 seismic maps and references AISC 341 for seismic force-resisting systems. We document connection types on drawings, reference applicable AISC 341 sections, and flag demand-critical welds and bolts for the engineer’s review when specifications require.
Our Los Angeles workflow
Review
Confirm SDC, system type (SMF, BRBF, etc.), and engineer’s seismic notes.
Model
Build Tekla model with seismic connections modeled explicitly.
Verify
Internal QA against AISC 341 detailing checklists.
Issue
Release shop/erection drawings and CNC files.
Support
Assist special inspectors and fabricators with RFI clarifications.
Related topics for Los Angeles projects
Buckling-restrained braced frames (BRBF)
BRBF connections require explicit core extension and gusset detailing per manufacturer data. We integrate vendor details into the Tekla model early.
Seismic rebar coordination at steel pods
Podium projects need clear embed and dowel coordination between steel detailers and rebar suppliers — we model embeds in 3D to reduce field conflicts.
Los Angeles FAQs
Do you detail Special Moment Frames in Los Angeles?
Yes — including RBS geometry, continuity plates, and demand-critical weld callouts coordinated with the engineer’s calculations.
Are your detailers familiar with AISC 341?
Our seismic packages follow AISC 341 and AISC 358 conventions with internal checklists for common SMF and bracing details.
Can you support California special inspection hold points?
We note hold points and weld inspection requirements on shop drawings per project specifications.
Do you detail for Seismic Design Category E or F?
Yes, when the engineer’s design and specifications define the system — we do not substitute systems without EOR approval.
What formats do LA fabricators receive?
PDF shop drawings, DWG/DXF, DSTV (.NC1), and IFC from Tekla when contracts require.
How quickly can you quote a seismic detailing job?
Within 24 hours of receiving structural drawings, connection design criteria, and project schedule.
Get a proposal for your Los Angeles project
Send drawings or models and receive a binding scope and fee proposal within 24 hours.