Structural Engineering for Commercial Construction — Nationwide
From steel frame analysis to foundation design, seismic engineering, crane runway systems, and PEMB coordination, TCG delivers integrated structural engineering across 38 states — fully coordinated with our architectural, MEP, and construction teams under one design-build contract.
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Structural Engineering for Commercial Construction
Structural engineering is the backbone of every building TCG constructs — determining the framing system, foundation design, connection details, and load paths that make the building stand up, resist lateral forces, and support its intended use. The structural system typically represents 15%–25% of total construction cost and is the single most important early design decision because it locks in the building's geometry, clear spans, floor loads, and construction sequence.
At Terrapin Construction Group (TCG), structural engineering is fully integrated into our design-build delivery — coordinated from day one with architectural design, MEP engineering, and construction management. This integration is critical because structural decisions directly impact MEP routing (beam depths affect duct space), architectural layout (column spacing drives room planning), and construction cost (steel tonnage, slab thickness, foundation type).
TCG's structural engineers design across all commercial systems — conventional steel per AISC, pre-engineered metal buildings per MBMA, cast-in-place and tilt-up concrete per ACI, cold-formed steel per AISI, wood-frame per AWC/NDS, and masonry per TMS. Seismic and wind design follows ASCE 7 and the IBC.
Structural Engineering Services
System Selection & Feasibility
Comparative analysis of PEMB vs. conventional steel vs. concrete vs. CFS. Span optimization, load path analysis, cost-per-SF comparison, and schedule impact. Coordinated with preconstruction budgets.
Foundation Design
Spread footings, continuous footings, mat foundations, drilled piers/caissons, driven piles, helical piles, and grade beams. Geotechnical coordination, bearing capacity analysis, and settlement calculations. Expansive soil mitigation strategies.
Superstructure Design
Gravity and lateral system design per ASCE 7 and IBC. Moment frames, braced frames, shear walls, diaphragm design, connection details, and column/beam sizing. Steel per AISC, concrete per ACI 318.
Slab & Floor Design
Slab-on-grade (4"–12"+), elevated slabs, composite steel deck, post-tensioned concrete, and reinforced concrete floors. Heavy floor loads for manufacturing, forklifts, racking, and data center equipment. Joint layout and crack control.
Specialty Structural
Crane runway beams and columns per CMAA and AISC Design Guide 7. Mezzanines, canopies, equipment platforms, rooftop mechanical supports, vibration isolation for sensitive equipment, and blast-resistant construction.
Peer Review & Forensic
Independent structural peer review for complex or high-occupancy buildings. Structural condition assessments, load evaluation for building reuse/conversion, and forensic investigation of structural distress or failures.
Structural Systems We Design
Structural Codes & Industry Organizations
ASCE 7
ASCE 7 (Minimum Design Loads) is the foundational loading standard for all structural engineering — specifying dead, live, wind, seismic, snow, rain, and flood loads referenced by the IBC for structural design.
asce.org →ICC / IBC
The International Building Code adopts ASCE 7 for loading and references AISC, ACI, AISI, AWC, and TMS for material-specific structural design. Seismic Design Category (SDC A–F) is determined per IBC and ASCE 7 based on location and site class.
iccsafe.org →AISC
The American Institute of Steel Construction publishes the Steel Construction Manual and AISC 360 (Specification for Structural Steel Buildings) — the governing standard for structural steel design, connections, and seismic detailing (AISC 341).
aisc.org →ACI
The American Concrete Institute publishes ACI 318 (Building Code for Concrete) — governing reinforced concrete design for foundations, slabs, walls, columns, and elevated structures. ACI 301 covers concrete construction specifications.
concrete.org →MBMA
The Metal Building Manufacturers Association publishes the Metal Building Systems Manual — the industry standard for pre-engineered metal building design, covering loading, serviceability, and erection tolerances.
mbma.com →AISI / CFSEI
The Cold-Formed Steel Engineers Institute and AISI publish standards for cold-formed steel structural members — widely used for light-gauge framing, mezzanines, and multi-story structures.
cfsei.org →AWC / NDS
The American Wood Council publishes the National Design Specification (NDS) for wood construction — governing wood-frame, glulam, CLT (cross-laminated timber), and mass timber structural design.
awc.org →TMS
The Masonry Society publishes TMS 402/602 — the building code for masonry structures covering CMU, reinforced masonry, and masonry veneer design used in commercial construction.
masonrysociety.org →CMAA
The Crane Manufacturers Association of America publishes crane classification (CMAA 70/74) that determines structural design loads for crane runway beams, columns, and connections in manufacturing and industrial buildings.
cmaa.org →PCI
The Precast/Prestressed Concrete Institute publishes the PCI Design Handbook — the standard for precast concrete structural systems including double-tees, hollow-core planks, and precast walls used in commercial construction.
pci.org →Structural Engineering Case Studies
150,000 SF Manufacturing — PEMB with Cranes
PEMB structural coordination with dual 20-ton bridge crane runway design per CMAA. 10" reinforced slab, drilled pier foundations on expansive soils. Integrated with manufacturing construction.
3-Story Mixed-Use — Structural Steel
Conventional steel frame per AISC with composite metal deck, moment frame lateral system, and spread footing foundations. Design-build delivery with MEP coordination for duct routing through beam penetrations.
Cold Storage Facility — Tilt-Up + IMP
Tilt-up concrete wall panels with steel roof structure for a 65,000 SF cold storage facility. Foundation design for freezer slab heating system to prevent frost heave. IMP envelope integration.
Multi-Story Data Center — Reinforced Concrete
Cast-in-place concrete frame designed for heavy floor loads (250+ PSF) for data center equipment. Vibration analysis for sensitive IT systems. Foundation on drilled piers with grade beams.
How Much Does Structural Engineering & Construction Cost?
Structural engineering fees typically run $1.50–$5.00/SF for standard commercial buildings or 1%–3% of construction cost. Complex structures (high-rise, heavy crane, seismic) reach $5–$10+/SF. Structural construction costs vary by system: PEMB at $12–$25/SF (most economical), conventional steel at $18–$40/SF, tilt-up concrete at $15–$30/SF, and CFS at $10–$20/SF.
Foundation costs range from $4–$10/SF for spread footings on good soils to $15–$40/SF for drilled piers on expansive or poor soils. Slab-on-grade ranges from $5–$8/SF (standard 5") to $12–$25/SF (reinforced 8–12" for heavy loads). Seismic design in high SDC zones adds 5%–30% to structural cost. MEP coordination with structural is critical to avoid costly field conflicts.
Use our AI estimator above, or schedule a meeting with our preconstruction team. Also explore our general estimator.
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Frequently Asked Questions
Browse common questions about structural engineering, or contact TCG. Visit our general FAQ.
Standard commercial: $1.50–$5.00/SF or 1%–3% of construction cost. Complex/seismic: $5–$10+/SF. PEMB engineering is typically included in the PEMB package. Foundation design adds $0.50–$2.00/SF. Use our AI estimator.
Yes — required for virtually all commercial construction. Determines bearing capacity, soil type, groundwater, expansive potential, frost depth, and seismic site class. TCG coordinates geotech during preconstruction.
Spread footings (most economical), continuous footings, mat foundations, drilled piers/caissons (expansive soils, deep bearing), driven piles (poor soils, high loads), and helical piles. Selected based on geotech report, structural loads, and cost. Per ACI 318.
Independent evaluation by a separate licensed SE. Required by many jurisdictions for complex or high-occupancy structures. TCG provides peer review when serving as owner's rep or construction manager.
Yes — across 38 states with offices in Denver, Houston, Albany, and Sheridan. See our project portfolio.
Let's Engineer Your Next Structure
From PEMB coordination to seismic steel design to deep foundation engineering, TCG's integrated structural team delivers engineered solutions — coordinated with architecture, MEP, and construction from day one.
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