Constrained Lagrange- in-solid

[Kalani Ranasinghe]

Hi, I am doing a research of seismic analysis of elevated expressway using LS DYNA. In my model l have used constrained Lagrange-in-solid option, however, rebar are not properly bond with the concrete and rebar moved to the downwards when model is running. Could you please help me to solve this?

[l...@schwer.net]

The recommended keyword for reinforcement in concrete is

*CONSTRAINED_BEAM_IN_SOLID. Please see the User Manual Volume I for details.                --len

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[James Kennedy]

Dear Kalani,

 

Some additional notes:

 

*CONSTRAINED_BEAM_IN_SOLID has been implemented. This feature is basically an

overhauled constraint coupling between beams and Lagrangian solids that includes features that

make it more attractive in some cases than *CONSTRAINED_ LAGRANGE_IN_SOLID,

for example, in modeling coupling of rebar in concrete:

 

Chen, H., “An Introduction to *CONSTRAINED_BEAM_IN_SOLID”, FEA Information

Solutions, Vol. 5, Issue 10. pp. 79-83, October, 2016.

 

http://www.feaiej.com/2017/feaiej_q1_2017.pdf

 

Solution options for including the initial tension in the tendons (static implicit, transient explicit, and

Dynamic Relaxation solutions) and various methods for coupling the tensioned tendons to the concrete

(shared nodes, *CONSTRAINED_LAGRANGE_IN_ SOLID, *ALE_COUPLING_NODAL_-

CONSTRAINT, and *CONSTRAINED_BEAM_ IN_SOLID) were given. The concrete was

modeled using *MAT_159 (CSCM) with the default parameters for a concrete with unconfined

compressive strength of 41.37 MPa:

 

Schwer, L.E., "Modeling Pre and Post Tensioned Concrete", 14th International LS-DYNA Users

Conference, Dearborn, Michigan, June, 2016.

 

http://www.dynalook.com/14th-international-ls-dyna-conference/constitutivemodeling/modeling-pre-and-post-tensioned-concrete

 

Examples of rebar coupled to concrete (*clis and *cbis) are given here:

 

http://ftp.lstc.com/anonymous/outgoing/support/FAQ_kw/concrete/coupling_by_clis.k.gz and

http://ftp.lstc.com/anonymous/outgoing/support/FAQ_kw/concrete/coupling_by_cbis.k.gz

 

Sincerely,

James M. Kennedy

KBS2 Inc.

June 19, 2024

 

 

From: ls-d...@googlegroups.com [mailto:ls-d...@googlegroups.com] On Behalf Of Kalani Ranasinghe
Sent: Wednesday, June 19, 2024 1:18 AM
To: LS-DYNA2 <ls-d...@googlegroups.com>
Subject: [LS-DYNA2] Constrained Lagrange- in-solid

 

Hi, I am doing a research of seismic analysis of elevated expressway using LS DYNA. In my model l have used constrained Lagrange-in-solid option, however, rebar are not properly bond with the concrete and rebar moved to the downwards when model is running. Could you please help me to solve this?

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