Deep Beam Design – Direct Modeling(1)

Deep Beam Design – Direct Modeling(1)

Deep Beam – Design Specification

http://astruttie.aroad.co.kr/help/Tutorial1/AStrutTie-Tutorial-DeepBeam.html

Let’s look at how to input and use the AStrutTie program through the design of deep beam using strut-tie model.

Thickness : 0.800m

fck : 24MPa

fy : 300MPa

Unit : kN.m

Code : ACI 318-14


Creating Element

– Click [New]

 Set  ACI 318-14

– Click [Add STM Element]

Input coordinates (0, 0) and enter key. Move is possible with Tab key

Input coordinates (0, 1.400) and enter key

Select on the bottom node (1) of the created member

– Click [F8] key , Ortho On

Move the mouse horizontally and click any point

[Distance] input 2.5m and enter key.

– Select the created horizontal member by dragging

[Ctrl + C], copy of element

[Ctrl + V], paste of element

Click on the upper node (2) of the vertical member as the reference point of the copied member

Drag the top horizontal member that was copied

– Select upper element

 Click [Divide]

Choose [Relative distance]

1st, input 0.7

[OK]

– Select all members created by dragging

Click [Mirror Node or Element]

Click on the upper right side joint and the lower right side joint of the member to specify the baseline

[Select Mirror Type] dialog –  choose [Copy]


Load Define and Loading

1. Load Define

– [Defind – Static Load]

Load Name : Dead,   Description : Description

Click [OK]

2. Loading

– Select two of the top of the absence by dragging

Click [Assign – Static Load]

Right-click on the left side of the load starting point

After clicking Static Load, the Element Static Loads (Dialog) appears by clicking the right button of mouse

when the color of node changes from green to red. And then, loads are assigned by clicking Add button.

Click [Add]

Choose [Relative]

1  Distance:0.0, Load:-1000

2  Distance:1.0, Load:-1000

3, 4 Distance:0, Load:0

[OK]

– Click [Defind – Load Combinations]

Click [Add]

LC01 : Dead=1.0, LC02 : Dead=1.3

Click on the load in the Work Tree and check it on the screen.

[save] – DeepBeam-1.stm


Make Structure and Area

1. Make Structure

– Select all members created by dragging

Design – [Create Outer Boundary] click

2. Make Area

– Select all members created by dragging

Design – [Create Area] click

– Click [Defind – Area Properties]

Thickness=0.800m

Compressive Strength of Concrete (fck)=24MPa,

Elastic Modulus of Concrete (Ec)=27,849MPa

– Click [Defind – General Properties]-Steel Tab

Yield Strength (fy)=300MPa,

Elastic Modulus (Es)=200,000MPa


 Modeling Mode

– Modeling Mode change

Click [Beginning Mode] → Modeling Mode


ESO

– Select [ESO]  The function is activated only in Professional Version.

On Work tree, Load Combination : LC01 select to see load and modeling

Select [LC02]

On Work tree, Load Combination : LC02 select to see load and modeling

– Click [Project Information]

Mesh size for ESO (m) : 0.1

– Click [View Options]

Node –  On

Node name – Off

Select 5 nodes on the bottom left

Click [Assign Restraints]

Set roller

Select 5 nodes on the bottom right

Click [Assign Restraints]

Set roller

Select the leftmost joint of the lower part

Click [Assign Restraints]

Set hinge

– Click [View Options]

Node –  Off

– Click [Analysis, Print Options]

Elimination Ratio for ESO : 0.01 → [OK]

– Choose LoadCase : LC01   – 1

Click [Run Model Analysis] – 2

View ESO analysis result   – 3


Stress Flow

Tip : The work flow is almost the same as ESO, please refer to ESO.

– Select [Stress Flow]

On Work tree, Load Combination : LC01 select to see load and modeling

Select [LC02]

On Work tree, Load Combination : LC02 select to see load and modeling

– Project Information – Mesh size for Stress Flow (m) : 0.2

VIEW – View Options Click

Node –  On

Node name – Off

Select 3 nodes on the bottom left

[Assign Restraints]

Set roller

Select 3 nodes on the bottom right

[Assign Restraints]

Set roller

Select the leftmost joint of the lower part

[Assign Restraints]

Set hinge

– [Run Model Analysis]

http://astruttie.aroad.co.kr/help/Tutorial1/AStrutTie-Tutorial-DeepBeam.html