Explicit STR and Autodyn Pt i 14.5 WS09 RC Drop

2011 ANSYS, Inc. November 1, 2012 1

14.5 Release

Workshop 9 Drop Test On Reinforced Concrete

Introduction to ANSYS Explicit STR &

Introduction to ANSYS Autodyn part I


Workshop Goal and Procedure Goal:

Model the drop test response of a reinforced concrete beam

Procedure:

Create an Explicit Dynamics (ANSYS) Analysis System Project

Select the units system and define the material properties

Import the geometry and mesh the reinforced concrete beam and steel parts

Define analysis settings, initial conditions, boundary conditions and body interactions, including reinforcement for the beam

Initiate the solution and review the results


Start Workbench

Start ANSYS Workbench and follow the sequenced steps using the abbreviations shown below:

DC = Double Click with Left Mouse Button

SC = Single Click with Left Mouse Button

RMB = Right Mouse Button Selection

D&D = Drag and Drop = Hold Left Mouse Button down on item while dragging it to new location and then release it

(i.e., Copy or Move)


Step 1 Check Geometry Options & Create Project

Line bodies are required for volume reinforcement. By default, imported line bodies will not be passed to Workbench Mechanical

1.a Check that Line

Bodies are selected in

the geometry import

options (Tools >

Options > Geometry

Import)

Warning: This step

must be performed

before creating the

component (step 1.b)


DC

Step 1 Check Geometry Options & Create Project

1.b Create an ANSYS Explicit Dynamics Component


Step 2 Specify the Project Units 2.a Select MKS for the Project Units from the

Units List provided

2.b Request that Native Applications in Workbench have their values be Displayed in the Project Units

2.c Check those unit systems to Suppress from appearing in the Units List

Note:

Engineering

Data is native

in Workbench,

but Mechanical

is NOT at this

time (but will be

in the future).


Step 3 Define Engineering Data Material 3.a Edit the Engineering Data cell to select pre-

defined material models from the data sources.

3.b Press the book icon to toggle the view from project materials to data sources

DC

SC

3.c Select the Explicit Materials data source. Material models in this data source can only be used in explicit dynamic analyses

Note: Materials in the General Non-linear Materials data source contain simpler material models that can be used in both ANSYS implicit and explicit analyses. dynamic analyses


Step 3 Define Engineering Data Material

3.d Scroll down to

CONC-35MPA and

click on the plus (+)

button to add it to

Engineering Data.

The book symbol

confirms it has

been added.

3.e Press the book icon again to toggle the view back to project materials.


Step 3 Define Engineering Data Material 3.f The simulation will involve a low velocity impact, and low

compressions are expected, so a linear EOS can be used. So, edit the CONC-35MPA material model.

3.g Unsuppress the Bulk Modulus

Note: The Polynomial EOS is then

automatically suppressed.

3.h Suppress the P-alpha EOS

SC

SC

SC


Step 3 Define Engineering Data Material

3.i Return to the Project Schematic

3.j Save the Project by selecting the Save As ... icon and Browse to the directory indicated by your instructor. Use the name reinforced_concrete for the Project name.

Note: Saving the

Project saves all of

the important files.

The Project may

also be Archived, in

which all of the

supporting files are

compressed and

saved in one file.


Step 4 Import the Geometry

RMB SC

4.a Import the geometry by the

procedure shown. Do NOT

Double Click on the

Geometry cell ...

4.b Browse to the

DesignModeler 11.0 SP1

geometry file named:

reinforced_concrete.agdb


Step 5 Edit the Model in Mechanical 5.a Edit the model in Workbench Mechanical.

Since Edit is the default action, double-clicking on

the Model cell is also acceptable here. RMB SC

5.b Select the MKS Units system

Recall that Mechanical is not native in Workbench, so

the Units here may not match the Project Units

Note: Although the unit system used for data entry

and post-processing is the MKS system, the actual

unit system used by the AUTODYN solver is the

mm-mg-ms system, because it provides higher

accuracy.


Step 5 Edit the Model in Mechanical

Steel Punch (moved

downwards)

Reinforced concrete

beam (bent)

Steel supports

(fixed)

5.c Define the concrete beam properties:

Stiffness Behavior = Flexible

Material Assignment = CONC-35MPA

5.d Leave all other properties as they are


Step 5 Edit the Model in Mechanical 5.e Delete the

Bonded

Contact

Regions RMB

5.f Review the existing

Body Interaction

specifications


Step 5 Edit the Model in Mechanical 5.g Insert an additional Body Interaction

for the beam reinforcement bars

5.i Save the Project

(from the project

page)

RMB

5.h Change Type to Reinforcement


Step 6 Mesh Model 6.a Select the Mesh branch

6.b Specify the Mesh Details:

Physics Preference = Explicit

Element Size = 0.015 meters

6.c Generate the Mesh (via RMB

on the Mesh branch)

RMB


Step 7 Define the Analysis Settings

7.a Specify the Analysis Settings:

End Time = 5.0e-3 seconds

SC

7.b Keep the remaining defaults


Step 8 Apply BCs and Initial Conditions

8.a Fix the supports:

Select the Face filter

Insert a Fixed Support

under Explicit Dynamics

Select the lower faces of

the two supports

Apply the selection

RMB

SC


Step 8 Apply BCs and External Loads

8.b Apply an Initial Velocity

Insert a Velocity under Initial

Conditions

Switch to Body filter

Select the steel punch

Apply the selection

Define by components

Enter a Y component of 20 m/s

RMB SC


Step 9 Insert Result Items to Review Later 9.a Insert a Total

Deformation plot

request under the

Solution branch.

9.b Insert a User Defined

Result under the

Solution branch -

allowing access to

Explicit Dynamics

specific results.

9.c Type in DAMAGEALL

for the Expression that

is highlighted

RMB

RMB

SC

SC


Step 9 Insert Result Items to Review Later

Note: DAMAGEALL is a result that is

specific to Explicit

Dynamics.

Once the simulation

has been run, a full

list of expressions

for User Defined

Results can be seen

by clicking on the

Worksheet button

after the Solution

tree has been

highlighted.


Step 10 Run the Simulation 10.a Select Solver Output under Solution

Information and Solve the simulation.

The Solver Output shows the run statistics, including the estimated

clock time to completion. Any errors or warnings are also noted.

Termination due to wrapup time reached is expected here.

SC

RMB


Step 11 Review the Results 11.a Select User Defined Result and Show the Elements under True

Scale. The range of DAMAGEALL will always lie between 0.0 and 1.0.

A DAMAGEALL of 0.0 is said to mean that the material is entirely

intact. A DAMAGEALL of 1.0 is said to mean that the material is

completely damaged and would easily break free.


Step 11 Review the Results 11.b Animate the results by setting the controls shown below and then

pressing the Animation button. To review a static result, just click on

the desired Time or Value from the Tabular Data and use the RMB to

pick Retrieve This Result. The given state will then be shown.

RMB

Pick these 2 first

Then pick this

Pick this to

save the

animation


Step 11 Review the Results 11.c Repeat the procedure, if

desired, for the Total

Displacement.

11.d Hide the Concrete body to

see the deflection of the

beams.

SC

RMB

SC

Documents

Explicit STR and Autodyn Pt i 14.5 WS09 RC Drop