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Dear everyone,
I am analyzing the bridge response under earthquake.I need to input earthquake waves at different times into different piers.Every piers receive the same earthquake wave at different time.How could I realize it?
Thanks a lot!

Dear everyone, I am sorry to disturb you again,but I need help. I added the zeroLengthContactD element between two BeamColumn elements successfuly .However ,I modulate the analysis for all the situations,it does not work.(matrix is singular) I know the zeroLengthContactD element can be used in the b...

I knew how to consider the mass in the Brick element.
I am so sorry to disturb you,but my mannual is out of time!

OK, I decide build the bridge using brick element,so I think this problem could be solved.
But I have another question:how could I consider the mass in the brick element?
Thank you!

Then how could I do?
My bridge is composed of beam column element,and I must consider the contact.So any suggestions?
Thank you!

wipe; model BasicBuilder -ndm 3 -ndf 6; # #3----------4 7----------8 # 2| 6| # | | # | | # |1 |5 node 1 -20 0 0; node 2 -20 60 0; node 3 -40 60 0; node 4 0 60 0; node 5 20 0 0; node 6 20 60 0; node 7 0 60 0; node 8 40 60 0; #zeroLenghtContact3Ddummy node node 9 0 60 0; node 10 0 60 0; fix 1 1 1 1 1 ...

Dear everyone, I need the zerolengthcontact3D in my bridge model which is 6DOF.I release DOF like this "equalDOF 55 81 1 2 3",but I always got the warning "WARNING ZeroLengthContact3D::setDomain cannot handle 6dofs at nodes in 6 d problem". Why?I don't know what's the matter. Are...

Dear vesna, Thank you for your reply.But I have some basic questions for the command.These are about local coordinates and global coordinates.If the local x-axis coincides with the global z-axis in the non-zero length element, could I think the "$x1 $x2 $x3" is "0 0 1"?I did like...

dear everyone,
Is the Isolator2spring Section 2D?
How could I simulate the 3D bearing in a bridge?
Thank you!

Hi everyone,
I want to build a bridge with zeroLengthContact3D element,but my model must have initional gap between two contact body.
My question is
How could I consider the initional gap in the zeroLengthContact3D element?
Thank you very much!

Hi, everyone,
I got the period of a bridge, but I donot know the direction.
Is there another method besides outputting the eigenvalue of all nodes?
Thank you!

This is my model: wipe; model basic -ndm 3 -ndf 6; logFile errorFile node 1 0 0 0 node 2 0 0 100 mass 2 2.0e4 2.0e4 2.0e4 2.0e4 2.0e4 2.0e4; fix 1 1 1 1 1 1 1 set GJ 1.0e20; uniaxialMaterial Elastic 100 $GJ; uniaxialMaterial Concrete04 1 -2.68e+7 -0.002 -0.004 3.25e10 2.39e+6 0.0001 0.1 uniaxialMate...

Dear everyone, I have another new question again.I run my input files with the method,but I just got the Periods. When I run # record eigenvectors #------------------------- for {set k 1 } {$k<=$numModes } { incr k } { recorder Node -file data/[format "mode%i.out" $k] -nodeRange 11 30 -dof...

It works OK now!I input the wrong sign of the coordinate.

Dear everyone, I tested my fiber section,it still had error.This is my file: wipe; model basic -ndm 3 -ndf 6; logFile errorFile node 1 0 0 0 node 2 0 0 100 fix 1 1 1 1 1 1 1 set GJ 1.0e20; uniaxialMaterial Elastic 100 $GJ; uniaxialMaterial Concrete04 1 -2.68e+7 -0.002 -0.004 3.25e10 2.39e+6 0.0001 0...