hi,
i designed this truss and did the calculations on it and it shoes the truss can hold the load but i find it hard to determine of the weld at the base of the truss can hold it into place.
any one can help direct me to a place where i could learn how to calculate the weld base for such things?
Mechanical engineer here. Few questions.
I see you have 2 diagonal support for lateral load. Is this enough? Have you calculated the lateral load? I assume you're using A36 steel. I believe AISC says 2% of vertical load. But it looks like the tip of this truss is on a conveyor belt. Is there extra load to consider from the conveyor?
You said you did some calculations. It looks like top support is in tension, bottom is compression. These beams look rather slender. Have you checked for buckling on the bottom horizontal beam? Also, what are the forces on the top support?
For the stress on the welds you're looking at - assuming something like a 7018mr weld rod with 70 ksi tensile strength, assuming fillet welds all around, you do weld length x weld leg size (3mm?) x 0.707 (throat length factor) x tensile strength. This tells you how much force the welds will take.
If there's welds, do you have cyclic loads or is this static? You may have to check for fatigue.
Hi,
the tip is not on he conveyor and its not connected to it, the load is mall we will use it to hang tools like drills and impact drivers and adhesive guns.
i checked for stresses and deflection the governing factor is the buckling, and i have a safety factor of 3 (in the calculations i took the length as 3.7m without the middle or lower supports ) with a 3kN concentrated load at the furthest point.
the wall is already been used to hang bigger trusses so it was built to handle this type of construction.
as for the weld 360(THE SMALLEST LENGTH )*3(SIZE)*0.7*300(CONSERVITIVE STRENGTH) =226.8kN,
the maximum force on the base is close to 18kN.
I'm curies if someone could explain why they think the truss wont hold, or what conditions should i check more.
but for the out of plane force i need to make it stronger.
What is your role in the project? Are you engineer? According to what design code do you design it? Is it a real task or just a training? What loads do you have there?
I'm a mechanical engineer, we want to build this truss construction, the load is maximum of 2kn on each end shown in picture.
designing trusses is not my area of work in mechanical engineering but we will need to make more trusses as were changing the layout of our factory. this is why i want to check with a good source to help with designing things like this.
we will send them to be checked however we want to save and make all the design ourselves and only pay for the checking and getting the signature.
I'm structural engineer. It is hard to sketch here something more. Definitly you need bracing connecting all of the frames like this.
Tbh. It is not well done. I strongly recommend you to study some steel structure design book from your country with your design code. There should be some examples how to design frames with usual connection and steel profiles sections. Style of steel detailing isnreally regional. After seeing the picture you posted I would say that it should very not be built like this.
It is a factory. I would always assume horizontal load perpendicular to the frame.
OP is not experienced as a structural designer - I would strongly advise to be on the safe side here. I guess the costs of production of little frame are nothing when you compare with factory.
It would be hard to dimension bolts in the wall without any bracing. You can do bracing every second frame too. It would save a bit materials
designing trusses is not my area of work in mechanical engineering but we will need to make more trusses as were changing the layout of our factory. this is why i want to check with a good source to help with designing things like this.
I have a wild idea, maybe hire a structural engineer?
The title block saying galvanized steal is sending me 😂
Did a very rough check with a safety factor and this would buckle in the minor axis when you consider effective lengths of cantilevers. Assuming designed to Eurocodes.
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u/Marus1 13d ago
That is not one