For lateral loads, Does being pinne

[Nuhu314]

For lateral loads, Does being pinned connection (beam to column ) affects the lateral frame resistance? Because though pinned won't the beam by itself have lateral load transfer mechanism between the columns? ? all of the members are glulam timber members. see the picture here
Now If the beam can manage to do this why do we need bracing or shear wall as long as the columns can share the load in that particular direction?

 

[molibden]

This is really basic statics but anyway.. If you have rigid base connections, then you can have pinned connections between beams and columns. And the other way around. But you cannot have all of them pinned.

It is really hard to design a rigid timber frame with moment connections only. You will have problems with designing connections, calculating the stiffness of connection, calculating REAL lateral deflections of the structure and many other tasks. It is much easier to use bracings or shear walls if it is an option. But don't forget about diaphragm design.

 

[Nuhu314]

Thank you molibden. I appreciate your answers.

 

[Nuhu314]

Thank you molibden. I appreciate your answer but what is the effect of having pinned or fixed connection on frame lateral resistance since pin connection have resistance on lateral direction Fx (x global axis )??why is bracing or shear wall required only due changes from fixed to pin? isn't the difference between the two( fixed or pin), one can transfer moment & the other cannot what does it have to do with lateral force? ?

 

[structSU10]

lets say you have a frame, with two columns and one beam. all the joints are pinned. What happens when you push on it? remember it is free to rotate at all joints, so what stops it from collapsing? That is the reason for a moment connection - the bending resistance at the joint is what provides stability for the frame. If you don't make a moment connection (you generally cannot create a reliable one for wood) you create shear walls or braced frames.

 

[Tmoose]

Hi Nuhu314,

I'd look up pantograph, then make a (not-a-computer) model from $5 worth of parts and then rephrase the question.

http://img2-2.timeinc.net/toh/i/g/13/home-solutions/04-10-uses/01-paint-stirrer.jpg

http://www.staples-3p.com/s7/is/image/Staples/s0311716_sc7?$splssku$

regards,

Dan T