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Hello, everyone. The soil constitutive is BoundingCamClay in my model, While, When I submit my job, there are some problems whether totle stress or effective stress method. Warning: BoundingCamClay::getCopy--subclass responsibility.(totle stress) opensees have stopped working(effective stress). Boun...

francisconazar wrote: > Dear Soheil, > > I'm currently modelling a tunnel subjected to an ovalling deformation and > so far the zerolengthContact elements work fine (for now, static analysis), > nevertheless, I'm interested in knowing how to extend the use of p-y and > t-z springs to this problem, i...

skamalzare wrote: > Hi, > > If you check Wiki, you can find a good description on implementation of > Py-Tz-Qz materials under the example "Laterally Loaded Pile > Foundation". > > > http://opensees.berkeley.edu/wiki/index.php/Laterally-Loaded_Pile_Foundation > > Bests, > Soheil Py-Tz-Qz m...

skamalzare wrote: > Shuaicai, > > I think, only adding the -mass $massDens will do the job for you. Keep in > mind that, FE model tries to solve the equation of motion: Mass * > acceleration + C_Damping * velocity + K_stiffness * displacement = > F_external > In solution system, the mass matrix will...

skamalzare wrote: > You'll still have numerical damping with HHT. Numerical damping affects the > simulation whenever your solution system performs integration. If you check > the integration methods in Wiki, you'll see when the damping is introduced. > > Generally, I use Newmark with gamma = 1.5 an...

skamalzare wrote: > Hi Shuaicai, > > I think the proper way to do it, is to input rho to you material, and > gravity (g=9.807) to the element. Therefore, in case of quadUP elements b2 > = -9.807. > For the dispBeamColumn, you need to only input mass per unit length > (=rho*area/UnitLength). > > I am...

Underground structures are created by dispBeamColumn element in my model, plane strain problem, bending moment and stress， strain of element can be recorded, but if I want to obtain shear force and axial force of this element , how to transform data recordered ?

skamalzare wrote: > Shuaicai, > > I might be able to help you, please try to explain the problem a little > more. What hits my mind now is that when you reduce your element size, you > essentially will have more numerical computations. If your analysis setting > applies numerical damping to your sys...

I created a underground structure model in plane strain, and the soil thickness (normal) is 8 m. The quadUP element is used to soil. In this elements, what's value of $b2, gravity acceleration components in vertical directions? Is it $g*$rho_soil, or $g*$rho_soil*$thickness? and displacement-Based B...

skamalzare wrote: > Simply define pseudo 3 DOF nodes at place of your 2 DOF structural nodes. > Then tie these nodes together with periodic connection (i.e equalDOF), and > make the pseudo node to be the slave. > Now you can connect the 3 DOF pseudo node to 3 DOF soil node with a > zerolength elemen...

When the element size is set as 0.01m, the result worked out is not correct, unless the element size set as 1m, the the result worked out is correct and better, May I ask how is this going? Thank you! Cheng Xuelei.

skamalzare wrote: > - Yes, they should be at same place. Otherwise, you will receive an error > that the length of zerolength element is beyond tolerance. > > - ZeroLength elements need nodes with same NUMBER of DOFs at both ends. I > guess, as long as both soil and structure nodes have same number ...

When the underground structure was after gravity analyses, it is necessary to reset the deformations to zero with "initial state analysis wrapper". So my question is : how to use this comoand, can you give me a simple example? Thank you! Chengxuelei. - turn off the frictional interfaces - ...

This command are used to construct uniaxial materials for p-y, t-z and q-z elements for modeling soil-structure interaction developed at UC Davis. While my question is how to use it, because it is not described by OpenSees Command Language lMannual in detai ? and can you give me a simple example? Th...

skamalzare wrote: > It really depends on your analysis. If you are working on static > simulations, both BeamContact2D and ZeroLength elements work just fine. > BeamContact2D elements work exclusively with ContactMaterial2D. This > doesn't let you capture toe effects. ZeroLength elements work with >...