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I use "beamWithHinges element" to build pier,may I use "Iz" corresponding to the effective stiffness Keff?Why?

thanks for your reply!may i do this in this way:i use "uniaxialMaterial Elastic" command to give the post-stiffness value ,then i use "element zeroLength" instead of "element elastomericBearing",add the material to the zeroLength element.is it right? "as you can is...

hello,fmk!
when i output the eigenvalues,LRB bearing is a bi-linear material,i want to use the post-stiffness to obtain the eigenvalues,how can i achieve
it? i use "element elastomericBearing" to simulate the bearing.

Thanks for you reply!

I have two questions.
First,when defining gravity load,the superstructure and the pier's dead weight are defined,the load that the superstructure transfer to pier is defined or not?OS can transfer load automatically?
Second,does the modal analysis add gravity analysis?

i'm sorry.i have other question to ask.the three spans simply supported beam place 12 bearings,that is each span simply supported beam place 4 bearings, i use "zeroLength element"to simulation bearing,zeroLength element's material is using Elastic uniaxialMaterial and ElasticPP uniaxialMat...

the end node of the first span and the starting node of the second span are the same location or not?if not,the results of the middle pier(the second pier) bottom shear are closing to the results of the side pier(the first pier) bottom shear,thanks.

i use os build a three spans simply supported beam,regardless of the collision,the nodes between adjacent spans are using the different coordinates or using the same coordinates?When i use the different coordinates,the results of the middle pier bottom shear are closing to the results of the side pi...

THanks!

@baozai
"an elastic beam with big stiffness",is using "element elasticBeamColumn"this command,and E is at least 100 times concrete's E ,is it right?

node 25 31.850 0.000 0.000 node 92 31.850 0.000 -2.350 node 104 31.850 0.000 -2.350 node 105 31.850 0.000 2.350 node 93 31.850 0.000 2.350 element elasticBeamColumn 302 104 25 $Ab $Eb $Gb $Jb $Ib $Ib 5 element elasticBeamColumn 303 25 105 $Ab $Eb $Gb $Jb $Ib $Ib 5 equalDOF 92 104 1 2 5 equalDOF 93 1...

Using opensees recently built a 3 span simply supported single girder bridge,Regardless of the collision,Each beam placed 4 bearings,node 2 is beam's node,node 102 and node 103 are the bearing's upper point,and i use "element elasticBeamColumn"command to connect the node 2 and node 102,nod...

Using opensees recently built a 3 span simply supported single girder bridge,Regardless of the collision,Between adjacent span,the two nodes can linked by using "element twoNodeLink"command?

Using opensees recently built a 3 span simply supported single girder bridge,Regardless of the collision,Each end is placed two bearings,Why I extract the pier bottom shear can not reach my hand calculated shear values?Whether support to force piers is wrong?The middle pier in the top section is pla...

Thank you ! I see!