CTY2S12- Steel Portal Frame

What is the main material commonly used in the construction of a portal frame?

• Stainless steel

• Concrete

• Aluminium

• Mild steel

In portal frame construction, what is the key difference between a purlin and a girt?

• Purlins and girts are identical in function and location, differing only in material.

• Purlins are horizontal members fixed to walls, while girts are horizontal members fixed to roofs.

• Purlins are vertical supports within a portal frame, and girts are diagonal braces.

• Purlins are horizontal members located in the roof structure, whereas girts are horizontal members fixed to the wall framing.

Which of the following is a disadvantage of using steel in construction?

• Steel provides high fire resistance without additional treatment

• Steel connections are generally inexpensive and easy to fabricate

• Steel requires fire and corrosion protection, adding to overall costs

• Steel structures can be erected without shop drawings

Which of the following is an advantage of using a steel portal frame in construction?

• High thermal insulation without added materials

• Lightweight structure that can reduce foundation costs

• Requires minimal maintenance due to natural corrosion resistance

• Can be built without the need for any structural bracing

How is the bottom of a steel column typically connected to a concrete footing in portal frame construction?

• By welding the steel column directly onto the cured concrete

• Using adhesive anchors drilled into the concrete after curing

• By placing holding down bolt assemblies in the concrete and adjusting after curing

• By embedding the entire steel column base into wet concrete

Which component is located at the base of the column in a portal frame?

• Base plate

• Purlin

• Eaves strut/tie

• Apex haunch

What is a Universal Beam (UB) and where is it typically used in a portal frame structure?

• A flat steel plate used as cladding support on walls
  

• A lightweight aluminium member used only in roof purlins
  

• A hot-rolled steel section with a wide flange, typically used for rafters and beams
  

• A hollow rectangular section used for bracing only

What should be considered when designing the spread of the frame at crane rail level?

• The requirements of the client and the crane manufacturer

• The color of the paint

• The type of flooring

• The landscaping around the building

In a tied portal frame, what is reduced along with the horizontal movement of the eaves?

• Vertical load

• Bending moments in columns and rafters

• Wind resistance

• Number of columns

What is the primary structural advantage of a propped portal frame?

• It allows for smaller rafters and less foundation shear

• It increases the number of internal columns

• It makes the building more energy efficient

• It reduces the need for insulation