Workshop On Structural Analysis And

Design Using Staad.Pro

Civil Engineering Department National Institute of Technology, Warangal (AP)

March 2013

BySHASHIKANT GADAG

Contents• Introduction to STAAD Pro • Terminology and Notations• Getting to Know the STAAD.Pro GUI• Introduction to Modelling• Material Properties and Section Properties• Supports,Loads and Load Combinations• Analysis and Post-processing• Modelling Complex Geometries• RC Building Analysis• Analysis for Seismic Loads

What STAAD Pro means???STructural

Analysis

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ProPro

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esign

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About STAAD Pro.• World’s leading Structural Analysis and Design Software.• Based on FEM & FEA• FEM- Finite Element Method• FEA- Finite Element Analysis

What is an Analysis????

Calculation of the Response of Structures to Actions

Why to Perform an Analysis????

To Calculate1.Stress Distributions2.Natural Frequencies3.Displacements4.Critical Buckling Loads etc…

Terminology and Notations

• Coordinate Systems Global Coordinate System Local Coordinate system• Units• Types of Structures Space structure(3D) Plane Structure(2D) Floor Structure(2D or 3D) Truss Structure(2D or 3D)

• Types of Members(1D) and Elements(2D & 3D) Truss Members Frame Members Plates and Shells Solids• Material Properties Young’s Modulus Poisson’s Ratio Density Damping Ratio• Stiffness Method

Conti…

• Typical Load Calculations

The Dead Load calculations are based on densities of materials and are assumed to be:

Material Unit Weights (kN/m3)

Brick Work 20

Plain Concrete 24

Reinforced Concrete 25

Earth 16-18

Mortar, Plaster 20

Steel 78.5

Water 10

Live loads are taken from IS:875 part-2 and are taken as 2 kN/m2 for floors of residential buildings,3 kN/m2 for floors of commercial buildings,1.5 kN/m2 for horizontal roofs with access, 0.75 kN/m2 for roofs with no access.

Getting to Know the STAAD.Pro -GUI

• Main Menu• Toolbars• Mode bar

Main Menu

• File

• Edit

• View

• Tools

• Select

• Geometry

•Commands

• Analyze

• Mode

• Windows

• Help

Structure Toolbar

Toolbars

Structure Tools Toolbar

Rotate Toolbar

View Toolbar

Geometry Toolbar

Generate Toolbar

Results Toolbar

Selection Toolbar

Mode Toolbar

Labels Toolbar

Steel Design Toolbar

File Toolbar

Print Toolbar

Mode Bar

Introduction to Modeling

Following are the steps involved in Modeling and Analysis:

• Create a new structure

• Customize the gridlines for creating nodes and beams

• Add nodes and beams

• Define material properties

• Define section properties and assign to members

Conti…

•Define supports and assign to nodes

• Define loads and assign to nodes and/or

members

• Define type of analysis

• Choose post analysis print commands

• Analyze the structure

• Study the results

Material Properties & Section Properties

Mode: Modeling General Materials• Define and Assign Material Properties

• Define and Assign Section Properties

Mode: Modeling General Property

Toolbar: Structure Tools

Property Page

Property Section Database

Supports, Loads and Load Combinations

Mode: Modeling

• Define and Assign Supports

General Support

Toolbar: Structure Tools Property Page

Type of Supports Restraints Releases

FIXED FX,FY,FZ,MX,MY,MZ ---

PINNED FX,FY,FZ MX,MY,MZ

ROLLERS RESTING ON HORIZONTAL PLANE

FY,FZ FX,MX,MY,MZ

• Loads and Load Combinations Mode: Modeling General Load

Load PageToolbar: Structure Tools

Conti…

Analysis and Post-processing

• Choose Analysis Type

• Choose Post Analysis Print Command

• Analyze the Structure

Mode: Modeling Analysis/Print Analysis

Mode: Modeling Analysis/Print Post-Print

Main Menu: Analyze Run Analysis (Shortcut Ctrl+F5)

Modeling Complex Geometries

• Structure Wizard

• Select Model Type- Different types are available• Double click on the model required• Define Parameters/Select Parameters dialog box• Go to File(Main Menu) – Merge Model with Staad pro Model

Conti…• Translational Repeat

Mode: Main Menu Geometry

Translational Repeat

• RC Building Analysis• Analysis for Seismic Loads

Thank you!