Our collaborative approach to steel connection design benefits standard projects, as well as iconic facilities where complex connections inform the architectural aesthetic. We collaborate with the architect and coordinate with the design team to enhance the accuracy of pricing by specialty contractors.
The detailing models are typically completed in three phases:
Phase I: 3D Model of Steel Members (Material Order Model)
All main structural steel framing members such as columns, beams and trusses are represented in a Tekla Structures 3D model. Members are entered with precise size, orientation and material properties – such as yield strength and mill test requirements.
The finalized Phase I Tekla model can be used by the contractor and steel fabricator to promptly complete their Advanced Bill of Materials (ABMs) for the purchase of structural steel shapes. Thornton Tomasetti Tekla models are usable deliverables – a significant improvement over the more traditional process – because they eliminate the need for model recreation by the contractor. The contractor can use the model for construction scheduling, sequencing, cash-flow analysis and tracking purposes. The Phase I model reduces quantity take-off time during bidding, provides accurate material and labor estimates through improved visualization, and helps reduce overall schedule time from award to material order placement.
Phase II: 3D Model of Steel Connections (Connected Model)
Depending on the project, we model either all structural steel connections or the major steel connections of the main structural members in the 3D model. Connections include all holes, bolts, shop welds and weld preparations and all connection material, including base plates, cap plates, gussets, stiffeners, splice plates, shear plates and connection angles.
The completed Phase II Tekla model can be used by the contractors and steel fabricators to quickly obtain CNC downloads (to link with fabrication equipment), field bolt lists, connection material quantity take-offs and to create shop drawings. The Phase II Tekla model precisely defines the scope and complexity, which streamlines shop drawing preparation and approval, and significantly shortens the project schedule and lessens the potential for claims.
Thornton Tomasetti provides assistance to the fabricator’s detailer regarding the implementation of the completed 3D model.
Phase III: 3D Model of Fully Detailed Steel (Shop Drawings)
Thornton Tomasetti produces fully detailed structural steel models, final physical shop drawings (shop piece and assembly drawings), erection plans, erection details, field bolt lists and CNC downloads for projects of any scale and complexity. The fabricator and erector can use this information without any additional effort to fabricate and erect the structural steel. This streamlined approach to shop drawing production and approval shortens the project schedule.
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