how do i model a continouis beam with a roller support at the mid span. i need the beam to be continous.
also how do i model a joint to have a semi rigid/pinned support. with a different stiffness.
thanks
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hello
can you help
i have attached both a paint file to decribe my problem and the autosad file to let u have a look
please can u help
thank you
gordon
I guess I'm not understanding what is so complicated about this problem. If you need elastic releases at those joints, just use member end release and specify an elastic stiffness in the release for that direction.
The beam should be modeled across both supports and extending out. It's just one beam. Apply support conditions and loads then analyze.
Where are you getting hung up?
This book http://tiny.cc/ARSAP2014_Book has a good section on member end releases and modeling supports and members.
thank u !
i understand this thank you
is there anyway i can design the node with rotational stiffness ?!
i want to make the frame less rigid, so i want more deflection at node 3.
basically the first desgin i want is to be completely rigid so gives litlle deflection . then the second desgin to be semi rigid/ pinned, so elastic at the two joints. do u understand . will i have to increase the stiffness ? or do i have to degin the acdtual nodes ? as what u have shown me is the members .
but if i model the nodes how do i connect them up with each other as i get nodes not connected to the frame ?!
thanks
The release definition that Rafal has shown above is introducing rotational stiffness in the connection between the vertical members and the horizontal members. If you want to first design as rigid, do not add member releases at the ends of the vertical member. When you are ready to design for semi-rigid, you add the release with elastic stiffness as shown to both ends of the vertical member.
does that help?
yes this helps thanks ! just wandering how would i make it less rigid ? increase the stifness or decrease ?! i want the structure to fail more at the end of the cantilever but changinging to elastic doesnt do this when i feel it should as it is less rigid ?!
yes i understand this but in a UZ direction !? so a nodal force acting down on node 3 !
i need more deflecstion here can u show me ?!
hi ken marsh here is a pdf of my problem ?! hope it makes sense !
appoligies i am inxeperienced with robot !
thank you
so u would recomend that i look at the beam as a single cantilever beam with the self weight and and other loads such as the floor cassette and live load i applied with weights and see if that matched my deflection from live testing. i can do this however . when i go to model the frame how would i be would i be able to model the joints i have been talking about ?! if i was to not make them elastic ?! just keep them rigid. in real life the joints are bolted this is why i thought poassiblty a rotational release with a designeated slip modulus ?! could i possibly change the roller at the top to a fixed of a spring ?
my project is the logterm deformation of accoya timber as glulam in a live project ! the extenstion u have seen in the picture. i need to find the stresses exerted in the cantilever beam. the structural part i am trying to keep simple if u know what i mean ! but id still want to calabirate the structure with my prelimanary testing !? i think ive just got to play around with the possible loads on the beams and try to get a structure with i similar deflcection to that of my real testing . how would i get the simple structure to deflect more at the end of the continuous beam . so i can say this matches the real structure with a more complex desgin possibly ?! i dont have the experience to desghn somethinmg too complex and im running out of time do you think i shoule look at it as just a contiuous beam or try and model as simple frame and keep changing it till i get a simialr deflection ! the only problem with this is im not sure what to change to get a greater difflection if u know what i mean . like before i tried to make the joints elastic ?!
hello thankzs for the help .
i was wandering when considering the loads that i am going to put on my beams . so self weight of all the beam, the weight of a casstte , the weight of floorboards and furniture and a point load of the windows . how do i consider them all at once and what factors should i give them ?
thanks
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