Structural Engineer in Los Angeles

Remote Structural Engineering for Los Angeles Projects

Sixteens Consultancy Services provides structural engineering for Los Angeles clients from our office in Kozhikode, Kerala, India. The California Building Code (CBC 2022) builds on IBC 2021 with California-specific seismic amendments — and seismic engineering is the central discipline for structural work in LA. We have demonstrated seismic engineering expertise from our Antalya (Turkey) project, designed for a high seismic zone with analogous SDC D-level demands to the LA Basin. For LADBS permit submission, a California-licensed Structural Engineer (SE) reviews and stamps the drawings.

Los Angeles sits on the LA Basin, one of the highest-seismicity urban areas in the world. The San Andreas Fault runs approximately 35 miles from Downtown LA, the Newport-Inglewood Fault runs directly through the urban core, and the Puente Hills blind thrust fault sits beneath Downtown. This fault environment — capable of producing Mw 7.5+ earthquakes — governs every significant structural decision in the city.

Structural Engineering Services for Los Angeles

• Seismic structural design — SDC D/E steel and concrete structures. Special Moment Frames (SMF), Special Concentrically Braced Frames (SCBF), Eccentrically Braced Frames (EBF), Buckling-Restrained Braced Frames (BRBF) per AISC 341-22. Reduced Beam Section (RBS) connections and Welded Unreinforced Flange-Welded Web (WUF-W) moment connections.
• Soft-story retrofit design — LADBS Mandatory Retrofit Program compliance. Steel moment frame insertion, new shear wall design, seismic isolation systems. ASCE 41 performance-based evaluation and CBC 2022 retrofit provisions.
• Non-ductile concrete retrofit — Assessment and strengthening of pre-1980 concrete frames lacking modern seismic detailing. ASCE 41-17 Tier 2/3 evaluation methods, fibre-reinforced polymer (FRP) column jacketing, concrete shear wall addition.
• Connection design — seismic moment connections (RBS, WUF-W), SCBF gusset plates, BRB connection interfaces, welded and bolted connections per AISC 360-22 Chapter J and AISC 341-22 seismic requirements.
• Foundation design — deep pile foundations, grade beams, and mat slabs on LA Basin soft soils. Near-fault ground motion effects on foundation design. Liquefaction assessment coordination.
• Design reports — full CBC 2022 / ASCE 7-22 / AISC 341-22 calculation packages with seismic load derivation, system selection justification, and connection design — formatted for California SE review and LADBS submission.

CBC 2022 Seismic Design for Los Angeles

Seismic Design Category D/E. The ASCE 7-22 spectral acceleration for the LA Basin is approximately Sa(0.2) = 1.5g at Site Class D (soft soils), placing nearly all LA structures in SDC D or E. SDC D/E mandates the highest level of seismic detailing: only ductile, code-compliant seismic force-resisting systems (SFRS) are permitted — ordinary moment frames, ordinary braced frames, and non-ductile systems are not acceptable in SDC D/E.

AISC 341-22 seismic provisions. For steel structures in SDC D/E, AISC 341-22 governs. Key requirements include: beam-to-column connection prequalification (RBS reduces column panel zone demands, WUF-W is used for column-strong connections), brace slenderness and compactness limits for SCBF, protected zone restrictions on welding and drilling, and strong-column/weak-beam design criteria for SMF to ensure ductile energy dissipation.

Buckling-Restrained Braced Frames (BRBF). BRBs are widely used in new LA construction due to their high ductility and energy dissipation. AISC 341-22 Section 18 governs BRB design: core plate area determines yield force, casing design prevents buckling while allowing core elongation, and connection (gusset plate) design must accommodate the BRB's test-validated overstrength.

CBC 2022 vs. IBC 2021 seismic differences. California's seismic amendments in CBC 2022 Chapter 16A include: mandatory site-specific ground motion analysis for structures near active faults (Near-Fault zone design), enhanced drift limits, and the LADBS Mandatory Retrofit Ordinance requirement for owners of non-conforming buildings.

Demonstrated seismic capability. Our Antalya (Turkey) project was executed in a high seismicity zone requiring ductile steel detailing — the same performance-based seismic engineering approach applied in LA. We bring this cross-market seismic expertise to every LA engagement.

LADBS Soft-Story Retrofit Programme

Los Angeles's Mandatory Retrofit Program — covering pre-1978 wood-frame soft-story buildings and pre-1980 non-ductile concrete moment frame buildings — is one of the largest mandatory seismic retrofit programmes in US history. Structural engineering requirements include: CBC 2022 / ASCE 41-17 compliant assessment, lateral system design for the retrofitted configuration, construction document preparation to LADBS standards, and LADBS Plan Check support through approval.

Structural Engineer Near You in Los Angeles

We serve Los Angeles clients across all districts and sub-markets — from Downtown LA's commercial towers to Hollywood's mixed-use developments, Santa Monica's beachfront structures, and the San Fernando Valley's industrial buildings.

Areas We Serve in Los Angeles: Downtown LA · Hollywood · Santa Monica · Burbank · Pasadena · Long Beach · Glendale · Torrance · El Segundo · Culver City · West Hollywood · Inglewood · Compton · Hawthorne · Alhambra

Applicable Codes for Los Angeles Structural Projects

• California Building Code (CBC 2022) — state adoption of IBC 2021 with California seismic amendments
• ASCE 7-22 — structural loads: seismic (SDC D/E, Sa(0.2) ≈ 1.5g), wind (45 m/s), gravity
• AISC 341-22 — seismic provisions for structural steel (SMF, SCBF, EBF, BRBF for SDC D/E)
• AISC 360-22 — structural steel design (LRFD)
• ACI 318-19 — reinforced concrete (with ACI 318-19 Chapter 18 special seismic provisions)
• ASCE 41-17 — seismic evaluation and retrofit of existing buildings
• LADBS Ordinance 183893 — Mandatory Retrofit of Soft-Story Wood-Frame Buildings

How to Start a Los Angeles Project

Send your brief to [email protected] or WhatsApp +974 6004 4913. Include: project type, approximate size, LA sub-market location, applicable code edition, and available drawings. We confirm scope, seismic design category, applicable SFRS, timeline, and fee within one business day.