The OpenSees Community

Many thanks for your useful comments.

Thank you, Frank.

Already I checked the manual. If I use "-doRayleigh", first Rayleigh command should be defined, so, it will apply to the whole of the model. But I just wanna apply 20% damping to the zeroLength element. How can I do this?

Thank you.

Hi all,

As far as I know, OpenSees does not apply stiffness proportional damping to zeroLength elements. Is there any solution?

Thanks.

Hi all, Rides and Popov (1994) mentioned that using Rayleigh damping is inappropriate for EBFs where the links go inelastic. "To avoid developing misleadingly larger axial forces in braces and columns that are adjacent to links that yield in shear, it is recommended that a form of nonproportion...

Hi all, Could you please guide me how I can apply horizontal and vertical ground motions at the same time? If I define: pattern UniformExcitation 1 1 -accel $accelSeries-H; pattern UniformExcitation 2 2 -accel $accelSeries-V; is it enough? Or should I define analysis commands (test, algorithm, syste...

Dear Selim,

You’ve made a very good point.

Tnx a lot.

Dear all,

I wanna model a gable frame steel structure (industrial building). Could you please guide me how I can make the nonprismatic sections?

Tnx.

Hi all,

I wanna model a timber (wood)-concrete composite beam. As you know timber behavior is not isotropic.
Could you please guide me what material/element should be employed for modeling of this beam?

Thanks.

Hi,

How can I get the period of structure at a given displacement? (nonlinear analysis which stiffness varies).

tnx

Thank you for your attention and response. Would you please let me know your email address for sending my script?

Hi all, The hysteresis loading-unloading loop (flag curve) obtained from OpenSees follows the same in the experimental test in modeling of self-centering system. But the OpenSees curve is thinner in comparison with test (lower energy absorbed). Would you please let me know the possible reasons? Than...

Dear all,

Spatially varying ground motion (SVGM) is caused by incoherence effect, wave passage, and local site conditions.
How can we apply this in opensees?

tnx.

Hi all,

How can we model a structure including “shear connector" (steel anchor)?

tnx.

thanks for your response. I use the default commands:

timeSeries Path 1000 -dt 0.01 -filePath elcentro.acc -factor 9.8;
pattern UniformExcitation 2 1 -accel 1001;

so, it reads the accelerations horizontally...

Hi all, For peer ground motions (like below), does opensees read the values horizontally or vertically? PACIFIC ENGINEERING AND ANALYSIS STRONG-MOTION DATA BORREGO MOUNTAIN 04/09/68 0230, EL CENTRO ARRAY #9, 270 ACCELERATION TIME HISTORY IN UNITS OF G NPTS= 4000, DT= .01000 SEC -.1368849E-02 -.16594...