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  • Deep Beam - Using Dxf

Product Information

Deep Beam - Using Dxf

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

Import Dxf

  • Click [New]
  • Set ACI 318-14
  • Load the dxf file you created.
  • The layer names corresponding to the structures are OUT, IN
  • The layer name corresponding to truss modeling TRUSS
  • Only Line accepted
  • Sample dxf file http://astruttie.aroad.co.kr/wp-content/uploads/2017/05/DeepBeam-1-dxf.zip
  • Click [Import] – The function is activated only in Professional Version.
  • Import DeepBeam-1.dxf (Unzip the DeepBeam-1-dxf.zip)

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 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 Conctete (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]

Truss

  • Select [Truss]

Load Assign

  • View Option- Boundary Load : True
  • Select two of the top of the absence by dragging
  • Click [Boundary Load to Truss Load]

Set Restraint and Edit Truss

  • Select the leftmost joint of the lower part
  • [Assign Restraints]
  • Set hinge
  • Select the rightmost joint of the lower part
  • [Assign Restraints]
  • Set roller
  • Delete – Unnecessary element
  • Truss Modeling is complete.

Define Tie Types

  • Truss members are all created and proceed to tie and strut member settings.
  • Click [Define Reinforcement Ties]
  • Click [Add]
  • Rebar Name = Upper
  • Rebar Type = Main Rebar
  • Main Rebar Type = Top Main Rebar
  • Centroid of Rebar (mm) = 100.0
  • 1st Cycle Rebar Diameter = #8
  • No. of 1st Cycle Number = 8
  • Click [Add]
  • Rebar Name = Lower
  • Rebar Type = Main Rebar
  • Main Rebar Type = Bottom Main Rebar
  • Centroid of Rebar (mm) = 100.0
  • 1st Cycle Rebar Diameter = #8
  • No. of 1st Cycle Number = 8
  • Click [Add]
  • Rebar Name = Shear
  • Rebar Type = Shear Rebar
  • Shear Type = Vertical Shear
  • Diameter = #10
  • Number of Legs = 2
  • Rebar C.T.C (mm) =300

Assign Tie Types

  • Select upper element
  • Click [Assign Tie Type]
  • Choose [Upper] → O.K
  • Select bottom element
  • Click [Assign Tie Types]
  • Choose [Lower] → O.K
  • Select center element
  • Click [Assign Tie Types]
  • Choose [Shear] → O.K

Bearing Plate

  • Select load acting node
  • Click [Assign Bearing Plates]
  • Vertical plates
  • B = 400mm
  • L = 350mm
  • T = 50mm
  • Effective Width = 400mm
  • [OK]

Max. Width and Outer Element

  • Click [View Options]
  • Max. Strut/Tie Width – On
  • Click [Calculate Max. Width ]
  • The available widths of all elements in a strut-tie model, calculated automatically by the program,
  • are displayed by executing the function DESIGN-Element Information or ASSIGN-Outer Element.
  • The available widths can be modified.
  • Technical Reference
  • The protrusion at the top is the max width considering the bearing plate.
  • If you want to change the max width of a member, you can change it by two methods.
  • The first is assign of Outer Element, the second is edit of Element Information.
  • Reducing the maximum width with this function will result in a more secure design, but overshooting can be over-designed.
  • Technical Reference – example
  • Select Element 5
  • Click [Outer Element]
  • I : 247.3
  • Click [OK ]
  • Double Click [No. of Element]
  • Element 7, I-Width : 0.353
  • Element 8, I-Width : 0.353
  • Element 9, I-Width : 0.247
  • Click [Close ]

Assign Strut Types

  • Select all element
  • Click [Assign Strut Types]
  • Choose [Prismatic Strut] → O.K
  • Technical Reference
  • In this example, all struts are set to Prismatic, but you can apply them differently at the designer’s discretion.
  • An indeterminate truss will show different results depending on the selected strut type.

Truss Analysis and Design Review

  • 1. Truss Analysis
  • Click [Renumbering]
  • Click [Run Analysis]
  • 2. Design Review
  • Click [Design Review]
  • Need to increase the amount of lower rebar.
  • Click [Define Reinforcement Ties]
  • Lower 1st Cycle Diameter : #9 →[OK]
  • Click [Design review]
  • Main Rebar Tie is OK.

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