John Chen's Activities

Plaxis 3D plate output unit kN*m/m

John Chen — Tue, 07 Jul 2020 01:07:15 GMT

for the output of a plate element unit, I understand in Plaxis 2D, output unit is kN*m/m, that is in/out of plane issue.

In plaxis 3D, i have a piled protection slab for gas main, the output unit of plate element is still kN*m/m, how do I interpret the total moment, just ignore the /m ?

M11 and M22 is in 2 different directions of local axis, the plate is very long along the gas main and I don't believe I need to times the length of plate to represent the total moment kN*m. So why the output is shown as kN*m/m

tied back wall - large prestress force cause the wall move back

John Chen — Tue, 03 Nov 2020 03:35:10 GMT

Hi,

For a deep excavation shoring structure, I have modelled in Plaxis and compare with RS2 (received from client). It seems large prestress force (around 1500 kN) in Plaxis drag the wall backwards. Which I don't believe this is right. While RS2 results shown expected movement pattern. Can someone explain why this happened ?

I have modelled the pile wall as plate using equivalent EA EI property. Free length anchor as node to node anchor. Bond length as embedded beam.

Plaxis Pile behaviour significantly differs from Lpile and Wallap

John Chen — Sun, 01 Nov 2020 23:33:20 GMT

Hi,

I have modelled Pile in Lpile, Wallap, and Plaxis 3D. Pile moment distribution in Lpile and wallap is similiar, however, Plaxis shows different behaviour.

Ground condition. Very soft clay, over soft clay over dense to very dense then rock.

Lpile and wallap moment gradually reduce to 0 as the depth increase. While Plaxis 3D pile reverse side moment is evern greater than positive side. (clay modelled as undrained B).

Any idea why this happens ?

3D embedded beam layer dependent average lateral (Perpendicular) stress

John Chen — Thu, 06 Aug 2020 07:29:18 GMT

Hi,

For the lateral (perpendicular stress) acting on 3D embedded beam, the formula in 3D-3-Material-Models, should it be 1/2(sigma xx + sigma yy) ?

Regards

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