The OpenSees Community

I found the mistakes. I should use the same version of the OpenSEES and its element code. That is why I have so many "local function definitions are illegal". The syntax errors appeared because I forgot the comma behind the variable. Another problem is that the capital or lower case of the...

Hi, I have a problem. Will you please tell me what may be the problem? I am so confused ..Thank you so much! I want to modify the existed element "BeamColumnJoint" by adding a new parameter in the element. I just added a few lines into the original beamColumnJoint2d.cpp and beamColumnJoint...

Hi Vesna, I have a question. I always give strain hardening value 0.001~0.01 to steel. And I found out that this value can affect the behavior of the element largely. Then, could you please tell me what is an appropriate value for strain hardening ratio? Is there any paper on this? I searched for a ...

Dr. fmk, I am learning adding new element to OpenSEES. I tried the example for Truss2D element (compile it and test it in VC++) according to the Instruction "Windows Vista DLL Creation". It worked! Then, I tried the BeamColumnJoint2d element. However, there are some problems. First, the er...

Hi, I have some questions on the joint formulation in BeamColumnJoint.cpp. I found that the meaning of some parameters are not clear and there may be some errors, or i have misunderstanding on some parameters in the joint. I try to email the writer NM (nmitra@u.washington.edu). But the email could n...

Hi Vesna, I have a problem: I have a cantilever beam, node 1 0 0 0; #left point node 2 0 0.5 0; #middle point node 3 0 1 0; #right point #step one: initial deformation# fix 1 1 1 1; pattern Plain 1 Linear { load 3 0.0 -1.0 0.0 } system BandGeneral constraints Plain integrator DisplacementControl 1 2...

Thank you guys^^

Hi, I have a problem on steel02 I defined a material for an element as following: uniaxialMaterial Steel02 300 80998 29080222 0.005 18.5 0.925 0.15 and applied cyclic loading on this element. But the the hysteretic stress-strain curve of this material is almost symmetric in positive and negtive dire...

Hi, I established an one bay one story frame, and the purpose was to match the test results. I use springs(with very large stiffness) to connect the shear panel to beam and column. I found in the P-delta curve, the P is almost half to 2/3 of the test results. I checked the force in the beam and colu...

Hi, I have a problem with the Bilin material. I use Bilin material for a spring with deterioration parameter set as following(refer to Lignos and Krawinkler ): LS 130.0; # basic strength deterioration ( LK 130.0; # unloading stiffness deterioration LA 1000.0; # accelerated reloading stiffness deteri...

Hi Vesna, Thank you for your reply!! I found my problem. I should not use equalDOF between the two nodes that form a zerolength translational spring. The model can work with beam and column as nonlinearbeamcolumn element type. If I use elastic element for spring, with displacement control, it can wo...

Hi Vesna, I found the problem. I should not use "equalDOF" between the two nodes that make a spring. But, there is another problem: if I the constraint is: fix 1 0 1 0 fix 6 0 1 0 fix 7 1 1 1 It can work, and the results are right. But if the constraint is: fix 1 0 1 0 fix 6 0 1 0 fix 7 1 ...

Hi Vesna, I did static analysis on a beam column connection model using some springs and rigid link to connect the beam/column to the shear panel. The vertical analysis is successful, but the lateral force failes for convergency problem. Could you please take a look and check my model? Thank you so ...

Hi Vesna, I made a simpler connection model, with two beams and two columns and one shear panel, the configeration is like in the Example BeamColumnJoint Element. I use one set of springs(two translational, one shear ) to connect the beam to shear panel, and another set for column and shear panel. S...

Hi, In the connection model, I use "nonlinearBeamColumn" type for the column and beam, the warning is "LAPACK routine returned 38", which means "not enought constraints in the model". Then I try "elasticBeamColumn" type for the column and beam, and the warning...