Using Diapheragm with hing simultaneously!

mkfotouhi · Post by **mkfotouhi** » Sat Jan 10, 2009 5:32 am

I am trying to build a 2D steel frame model which has 3 story and 5 bay in each story. the first three bay beam-column connections are rigid but the two other bays have hing connection.
To define a hing connection in opensees one should define two point in one coordinate and constraint them by means of equalDOF object. If I want to define a diaphragm for each story and constrain first DOF for all nodes in one story, what should I do? Consider the limitations that the opensees can not accept a node to be define both as Slave and Master and also one node can not be the Slave for two different Master nodes.

silvia · Post by **silvia** » Sat Jan 10, 2009 8:25 am

with the secondary node, slave some dofs to the primary node, the others to the diaphragm. try that.

mkfotouhi · Post by **mkfotouhi** » Sat Jan 10, 2009 9:04 am

Dear Dr Silvia,
Thanks for your kind attention.
I have four levels and 5 bays in my model. The label of nodes are defined as nodeID= 10*level+bay .There are hing at nodes in bay 4 and 5. (for example for level 2 the nodeID are: 21 22 23 24 242 25 252 26 263 264--node 24 25 and 26 are hing). According to your guidance I modified the node constraint as follows. would you please check this since I get warning while run the model. (I choose node 24 34 and 44 as master node in each story)
Thanks

# BOUNDARY CONDITIONS
fix 11 1 1 1;
fix 12 1 1 1;
fix 13 1 1 1;
fix 14 1 1 1;
fix 15 1 1 0;
fix 16 1 1 0;

equalDOF 45 452 2;
equalDOF 35 352 2;
equalDOF 25 252 2;
equalDOF 44 442 1 2;
equalDOF 34 342 1 2;
equalDOF 24 242 1 2;

equalDOF 24 25 1;
equalDOF 24 252 1;
equalDOF 34 35 1;
equalDOF 34 352 1;
equalDOF 44 45 1;
equalDOF 44 452 1;

equalDOF 46 463 1 2;
equalDOF 36 364 1 2;
equalDOF 36 363 1 2;
equalDOF 26 264 1 2;
equalDOF 26 263 1 2;

for {set level 2} {$level 4} {incr level 1} {
set msnod [expr $level*10+4];
for {set pier 1} {$pier <= 3} {incr pier 1} {
set slnod [expr $level*10+$pier];
equalDOF $msnod $slnod 1;
}
}

silvia · Post by **silvia** » Sat Jan 10, 2009 11:59 am

read the warning and keep working on it to make it work.

mkfotouhi · Post by **mkfotouhi** » Sun Jan 11, 2009 3:34 am

I could not correct the possible mistake in the model. would you please check the part that I paste here? the warning is in this part and is about node constraints.
Thanks in advance

silvia · Post by **silvia** » Sun Jan 11, 2009 7:58 am

there is not enough commands to run the script.
please post the warning.