Structural Steel & Precast BIM Detailing: Connections, CNC Files & Fee Guide

Structural steel profitability and seismic safety live or die at the connection node. Supervised by Civil Engineer Co-Founder Celalettin YAĞMAHAN, SerMimar delivers Eurocode 3/8 and AISC compliant 3D connection design and Tekla/Revit LOD 400 fabrication packages that bolt together cleanly on site.

Engineered to LOD 350 / 400 Steel precision across a reference benchmark of 2,000 – 50,000 m² under Eurocode 3 & 8 · AISC 360/341 · EN 1090-2 · TBDY 2018, this canonical specification unifies spatial design, multidisciplinary clash resolution, and 5D cost certainty prior to site mobilization.

Structural Grid & Modular Alignment: Clear-span portal frames (20 m – 60 m), multi-story braced/moment grids, overhead crane girders, and mezzanine decks.

Primary column grids, facade mullion subdivisions, and subterranean parking geometry are locked onto a unified datum—eliminating non-standard off-cuts and costly site framing adjustments.

Spatial Program & Net-to-Gross Efficiency: Tonnage-per-m² optimization balancing standard mill section availability (HEA/HEB/IPE/UB) against fabrication labor hours.

Live parametric Revit area schedules track net usable/leasable floor area against vertical cores, MEP plantrooms, and envelope wall thickness at every design iteration.

Vertical Cores, Logistics & Life-Safety Egress: Industrial catwalks, caged/spiral maintenance ladders, crane maintenance platforms, and EN ISO 14122 handrails detailed in 3D.

Travel distances, pressurized stair cores, ADA/accessible routing, and heavy service/loading dock swept-path geometry are validated against NFPA, EN, and local building regulations.

Subsurface Utilities, Drainage & Wet Shafts: Pre-engineered cellular/castellated beam web openings reinforced for large process piping and HVAC mains.

Gravity stormwater and foul drainage stacks are modeled with true 1.5%–2.0% invert slopes, locking structural beam web penetrations and acoustic riser sleeves before rebar detailing.

Domestic Plumbing, NFPA/EN Sprinkler & Hydronics: Roof purlin and truss node point-load allowances verified for wet/ESFR warehouse sprinkler grids.

Wet/dry sprinkler grids, fire hose cabinets, booster pump skids, and hydronic manifolds are spatially coordinated above ceiling plenums without compromising architectural clear heights.

HVAC Routing, Acoustics & Zero-Clash Verification: Rooftop packaged unit steel dunnage frames and vibration-isolated equipment platforms coordinated with roof sheeting.

Automated Navisworks and Solibri rule-sets enforce ±3 mm hard-clash tolerances and 25–50 mm insulation/maintenance clearance zones, closing 100% of BCF issues prior to tender issue.

Structural Framing & Seismic Engineering: Moment end-plates, haunches, gussets, baseplates, shear studs, and cast-in HD holding-down anchor bolt templates calculated and clash-checked.

Inter-story seismic drift ratios, ductile steel moment/braced connections, foundation punching shear, and secondary facade subframes are signed off by our senior structural engineering partners.

Building Envelope & Hygrothermal Physics: Cold-formed Z/C secondary purlins, side-rails, sag-rods, and facade curtain-wall cleat plates detailed ready for cladding.

2D/3D thermal-bridge condensation risk is audited per EN ISO 6946, pairing Class A1 mineral-wool insulation, vapor-permeable membranes, and slotted seismic facade brackets at 1:5 shop detail scale.

Georeferenced Masterplan & ISO 19650 CDE: IFC4 Structural Analysis & Reference views synchronized continuously with architectural and MEP models.

All discipline models share true survey coordinates (UTM / National Grid) and progress through ISO 19650 WIP → Shared → Published gates inside the Common Data Environment.

Native BIM & Construction Documentation Package: 3D Tekla/Revit model, Anchor Bolt Setting Plans, General Arrangement (GA) erection sets, Single-Part & Assembly sheets, .NC1/.DXF files, and Bolt/Paint lists.

Clients receive unlocked native Tekla / Revit .IFC4 · .NC1 (DSTV) · .DXF · GA & Assembly .DWG source files, plotted PDF/DWG construction sets, and signed zero-clash audit certificates.

5D Quantity Take-Off (BoQ) & Indicative Studio Fee: The indicative engineering & BIM fee band for this reference scope is $14,000 – $32,000 (for 10,000 m² / ~450–600t steel ref.) (with indicative construction CAPEX benchmark at Zero Field-Torch Cutting · ±0.5% Steel Tonnage Precision). Optimizes primary steel weight by 6%–12% through refined connection mechanics while preventing crane standby delays on site.

DfMA Prefabrication & Export Execution Pathways: Part lengths and splice locations engineered for 11.85 m 40HC containers or 13.60 m Euro-trailers, plus hot-dip galvanizing bath limits.

Clients may tender the open BIM package to any local contractor or leverage our integrated group factories (SerBuild steel structures, SerMimar İskele EN 12810 scaffolding, SerMimar Şömine hearths, and SerSourcing 40HC consolidation).

International Codes, Sustainability & Compliance: EN 1993 (Eurocode 3), EN 1998 (Eurocode 8), EN 1090-2 EXC2/EXC3, AISC 360/341, and Turkish Steel Code / TBDY 2018.

Structured directly for LEED / BREEAM / RE2020 energy modeling, UK Building Safety Act Golden Thread compliance, Eurocode National Annexes, and institutional lender due diligence.