elastomericBearingPlasticity

[SunshineOPENSEES]

Hi all

1. I use Elastomeric Bearing (Plasticity) Element to construct the isolator. But the first modal value is not right. The isolator didn't deform in the shear joint in the middle of element.
2. The first modal value calculated by opensees was 1.16s, while the value was 2.76s in ETABS.
3. There are "rigidDiaphram" in my model. I wonder that the Elastomeric Bearing (Plasticity) Element can not be used in the model with rigidDiaphram.

uniaxialMaterial Elastic 100 1e+07
uniaxialMaterial Elastic 200 1e+07
##element elastomericBearingPlasticity 1 1 2 20 2.50 0.02 0.0 3.0 -P 1 -T 2 -My 3 -Mz 4; # for a 3D elastomeric bearing
##选用LRB300和LNR300的隔震支座
element elastomericBearingPlasticity 294 704 873 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 296 705 874 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 298 706 875 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 300 707 876 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 302 708 877 610 10000 1.0 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 304 709 878 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 306 710 879 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 308 871 880 610 10000 1.0 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 310 711 881 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 312 712 882 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 314 713 883 610 10000 1.0 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 316 714 884 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 318 726 885 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 320 727 886 610 10000 1.0 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 322 728 887 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 324 715 888 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 326 716 889 610 10000 1.0 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 328 717 890 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 330 718 891 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 332 872 892 610 10000 1.0 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 334 719 893 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 336 720 894 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 338 721 895 610 10000 1.0 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 340 722 896 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5

element elastomericBearingPlasticity 342 723 897 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 344 724 898 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5
element elastomericBearingPlasticity 346 725 899 5720 16000 0.1 0.00 3.0 -P 100 -T 200 -My 200 -Mz 200 -shearDist 0.5


Look forward to your replay.
Thank you very much.
Best regards
Guorong

[selimgunay]

There should not be a specific problem of using any element together with the rigiddiaphragm command. To explore further, you can develop a SDOF system in OpenSees and ETABS with the same mass and using Elastomeric Bearing element in OpenSees and the corresponding element in ETABS

[mhscott]

I agree with Selim, the rigid diaphragm does not depend on the type of element.

See if you can make ETABS and OpenSees match for this simple problem: https://portwooddigital.com/2021/07/11/ ... aint-easy/