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I have meshed a dam and a reservoir (see image: https://ibb.co/nq0207). I am trying to do a coupled seismic analysis and I currently have the gravity analysis working with the following boundary conditions: Base of dam is fixed in the vertical direction. Sides of foundation (orange in the image) are...

I am trying to model the pore water pressure in a dam with the upstream face submerged by the reservoir. I know I can set the pore water pressure fixities, however so far I have only found this useful if I have a level water table - however in my situation, since there is a body of water on a side o...

I believe I have made some improvements to the script and am getting closer to solving this problem: I defined a gwt by assigning nodes above it with fixed pwp, and nodes below it with free pwp. For the gravity analysis, I have assigned the permeabilities to be 1 (to ensure hydrostatic conditions), ...

What will the eigenvalue analysis do?

I have assigned masses to the surface nodes where they are submerged under the water table - is this correct?

I am currently having some trouble running a coupled analysis of an earth dam. The uncoupled analysis using quad elements ran fine and showed reasonable results. However changing the quad elements to Four Node Quad u-p Elements (element quadUP) gives QNAN errors during the dynamic analysis (the grav...

Hi,

Is it possible to model pore water pressures using a quad element? The examples I have seen use 9-noded elements and I have yet to find an example using a 4-noded element.

Thanks

I am running two earthquakes on a model simulating an earth dam. The first earthquake is shorter and has smaller accelerations, this runs fine. However when I run the second earthquake, it fails to converge: WARNING: CTestNormDispIncr::test() - failed to converge after: 30 iterations current Norm: 6...

selimgunay wrote:
> For uniaxial materials, output strains are axial stress and strain.
> Therefore, you cannot find the shear stresses and strains. Which material
> and element are you using?

I am using a PressureDependMultiYield material (I am trying to model soils).

I am analysing an earth dam under a seismic acceleration - what is the correct way of applying the acceleration? I am using the following the define the acceleration: set accelFile "eq2accel.csv" set cFactor 1 timeSeries Path 1000 -dt $dT -filePath $accelFile -factor $cFactor pattern Unifo...

The recorder for stress and strains, what are the headings that are outputted?

Why are there more columns for stress and which are the columns I need to find the shear stresses and strains?

I am trying to define a seismic motion in my model using the following input: INPUT set accelFile "EQ2accel.csv" set cFactor 1 set accelSeries "Series -dt $dT -filePath $accelFile -factor $cFactor" pattern UniformExcitation 2 1 -accel $accelSeries However when I run the model in ...

Hi All, I am a new user of OpenSees and am currently writing a script to analysis the seismic response of a 2D earth dam on a foundation layer. The geometry for this is relatively simple and I have created the mesh for this (link to what the mesh looks like - https://ibb.co/eXUwKb). I am applying th...