industrial steel stair 3d model

Create a detailed industrial 3D model of a fixed mild-steel access stair. Geometry Floor to floor height: 4000 mm Clear stair width: 1200 mm Stair angle: approx 35 degrees Number of risers: 23 Riser height: 175 mm Number of treads: 22 Tread depth (going): 250 mm Provide top and bottom landing, each 1200 mm long. Structural Members Stringers (2 nos.) Section: ISMC 200 channel Continuous from bottom to top landing. Tread supports ISA 50×50×6 mm cleats welded to stringers. Treads Size: 1200 × 250 mm Material: 6 mm MS chequered plate (allow option: bar grating). Support System Provide vertical support columns from ground. Section: RHS 100×50×6 mm. Provide supports at: bottom, mid height, near top. Add angle bracing: 40×40×5 mm. Landing Frames ISA 75×75×6 mm. Flooring: 6–8 mm chequered plate. Handrail Both sides. Height: 1000 mm from nosing. Post: 40 NB pipe @ 1000 mm spacing. Top rail: 40 NB. Mid rail: 25 NB. Optional vertical balusters. Connections Welded construction. Prov