Problem about TRUSS element

esi_opensees · Post by **esi_opensees** » Sun Nov 23, 2008 11:55 am

Hello

would you please tell me how i can model a truss element with an imperfection (e.g. 0.01L) on the center of element?

silvia · Post by **silvia** » Sun Nov 23, 2008 1:11 pm

i think you define two elements with the node a little off center......
but someone may have actually done this differently....

esi_opensees · Post by **esi_opensees** » Sun Nov 23, 2008 8:18 pm

Dear silvia,

thanks a lot for your help but if i define the extra node at the center of truss element, this node is hinge; however for other elements there is no problem.
i want to define imperfection at the center of TRUSS element without created extra hinge. How can i do it?

Thank you in advance.

silvia · Post by **silvia** » Sun Nov 23, 2008 8:38 pm

oh, yes.
do some searches on this forum, someone has described it in detail.

esi_opensees · Post by **esi_opensees** » Mon Nov 24, 2008 1:46 am

i found the below address, but it is not for truss element

http://opensees.berkeley.edu/community/ ... &view=next

would you please give me some help?

tnx.

silvia · Post by **silvia** » Mon Nov 24, 2008 10:09 am

maybe using a truss element is not the answer.
please do more research on it, see what Patzi Urix (or switch the z and x) had one in the literature.

imancivil · Post by **imancivil** » Tue Nov 25, 2008 11:58 am

Is it possible that we add rotational degrees of freedom at the end of truss element? If so, how?

With this technique we can create the extra node at the center of truss element without hinge. What is your opinion?

esi_opensees · Post by **esi_opensees** » Tue Nov 25, 2008 8:02 pm

Dear silvia,

is the strategy that imancivil proposed feasible?

silvia · Post by **silvia** » Tue Nov 25, 2008 8:37 pm

naw.
i'd use a nonlinear beam-column element with hinging at the ends, using two nodes at the same location and connecting the translational dofs....