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Introduction to Analysis Using STAAD Pro

Hemant Gor (GorHemant@Gmail.com)

Agenda Analysis Options

Analysis type 2D,3D,Truss and Floor ( Grillage) Modelling

The Modelling Process involves providing Input Modelling using AutoCAD

Importing DXF (Drawing Exchange Format File into STAAD)

Loading, Supports, Constraint and Properties Postprocessing

Understanding the Output of Analysis

Analysis Options In STAAD Pro Following four Structural forms

can be analysed based on Degrees of Freedom (DOF) of Each Joint Space ( Each Joint having 6 DOFs,

Full 3D analysis) Plane (It is In-Plane Analysis, each

joint having 3 DOFs, two displacements and one rotation

Floor (It is Out-of-plane Analysis, Each joint having 3 DOFs, One Displacement and One Rotation

Truss ( Members can take only Axial Forces i.e. Compression or Tension)

Generating Input file STAAD Pro Provides

two options for generating Input Structure Graphical User

Interface (GUI) The Text File ( having

file Extension STD) 2D Grid to Add

Member using SNAP Option

STAAD Pro Overview Modelling

Geometry General Analysis Design

Post Processing Joint Displacements / Support Reactions Member Forces Element Forces Mode Shapes / Deflected Shapes

Geometry Add / Edit Joint Co-

Ordinate Add Beam Using SNAP

Options JOInt COOrdinates

1 0 0 0;2 10 0 0;n x y z;

MEMber INCidencesm i_node j_node1 1 2;

Geometry Copy / Paste Option for

JOINTS/MEMBERS ( Click on Reference Point, Similar to AUTOCAD reference Pt.)

Translational Repeat Circular Repeat

General Assigning Property

Steel Sections Prismatic Sections Local Axis Orientation ( Beat Angle)

Specification Load & Definitions Material

Young’s Modulus, Poisson’s Ratio, Density, Coefficient of Thermal Expansion

General - Property

Member 3 is having Joint 5 as START Joint and Joint 6 as END Joint

For Beams Local Y is along Global Y

Rectangular Section Beam Local Axis

Blue - Local X Red - Local Y Green – Local Z

Cross Section Dimensions

YD Dimension along Local Y Axis

ZD Dimension along Local Z Axis

YD

ZD

Local Z

General - Spec

Specification Node (Constraints)

Master Slave ( Master Node and Slave Nodes)

Rigid ( All Six DOFs are Same)

Spec - Beam

Specification Beam

Moment Release Tension/Compression

only Member Offset Truss

Support – Restraint to Joints Boundary

Condition to Joints Pinned Fixed

Support – Fixed But Roller Support

Node_ID FIXED BUT FX FZ MX MY MZ

Spring Supports For Pile Foundations Node_ID FIXED BUT KFY ??? FX FZ MX MY MZ

Loads & Definitions Primary Load Cases

First Define Load Case

Load Application Self Weight Joint Loads Member Loads Element Loads Earthquake Loads

Primary Load Case – Joint Loads Application of Forces and

Moments in Three Global Directions at Joint

CommandJOINT LOAD1 FX 10 FY 20 FZ 30 MX 40 MY 50 MZ

60

Joint /Member /Area /Floor Loads

Primary Load Case – Member Load Uniformly Distributed Force ( Uniform Force) Uniformly Distributed Moment (Uniform Moment) Linear Varying Load Triangular Load

Member Load – Concentrated Force

Load Combination

Load Factors

Primary Load Cases

Load Combination No

Perform Analysis

Commands