Hello prof. Walls I just wanted to know with regards to modelling the portal frame, if you are designing such that your columns resist bending induced by wind actions, do you model your base fixity as a fixed or pinned support ? If pinned how will one determine the moment of resistance at the support? thanks. A Witsie would appreciate your clarity.😥
You would model it to match what you build on site. Base plates can be made to act as either fixed or pinned. Hence, if you assume pinned end conditions during design then make sure you specify a pinned base plate (e.g. bolts located close to the centre of the base plate such that they have limited rotation capacity)
Hello Sir Sir I want to know that how we calculate the steel beam size (its web,outer flange and inner flage) Similarly calculate the rafter size its web,its inner flange and outer Flange.and column base plate size with holes and nuts and connection plate size.All of those have a Formula to know sizes? Please sir if any formulas then tell me. Please Please
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Detailed, useful. Thank you!!
Excellent discourse! thanks Prof Walls.
Brilliant explanation
Hi Prof Walls, I still consider a load combination of 1.5Gk (dead load in isolation). Is the 1.5 factor outdated, seems like you use 1.2?
@@meaghancarlisle9341 the 1.5 factor has been replaced by the 1.35 factor under the STR-P case
@@richard_walls Ah thanks, makes sense. Looks like it changed years ago, oops. 🙈
Good day. do you have an example on calculating the loads on a roof truss
Where did that 5m come from ,one you multiplied with to get the purlin load?
The portal frames are 5m apart. You would get that from the layout drawing or decide what it should be to suit your building. Thanks
Thats the 5 meter C.O.C. portal frame Fred Themen
Where does the 5m come from in this calculation?
@@mib9550 the spacing between bays.
Hello prof. Walls
I just wanted to know with regards to modelling the portal frame, if you are designing such that your columns resist bending induced by wind actions, do you model your base fixity as a fixed or pinned support ? If pinned how will one determine the moment of resistance at the support? thanks.
A Witsie would appreciate your clarity.😥
You would model it to match what you build on site. Base plates can be made to act as either fixed or pinned. Hence, if you assume pinned end conditions during design then make sure you specify a pinned base plate (e.g. bolts located close to the centre of the base plate such that they have limited rotation capacity)
Hello Sir
Sir I want to know that how we calculate the steel beam size (its web,outer flange and inner flage)
Similarly calculate the rafter size its web,its inner flange and outer Flange.and column base plate size with holes and nuts and connection plate size.All of those have a Formula to know sizes?
Please sir if any formulas then tell me.
Please
Please
Hello, i need help design a beam-column that supports a crane.
I always used 1.4 factor for permanent loads, now I see you are using 1.35,
It's also 1.35 in the Eurocode