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E4E4--E5 CIVIL E5 CIVIL

(TECHNICAL)(TECHNICAL)

STAAD PRO STAAD PRO –– An Overview An Overview

WELCOME

• This is a presentation for the E4-E5 Civil Technical

Module for the Topic: STAAD PRO – An Overview

• Eligibility: Those officers of civil wing who have got the

Up-gradation from E4 to E5.

• This presentation is last updated on 21-4-2011.

• You can also visit the Digital library of BSNL to see this

topic.



AGENDA

Introduction

Features of STAAD PRO

Types of structures & Elements

Axis & Sign Convention in STAAD PRO

Steps of Design using STAAD PRO

Typical Command Sequence in STAAD PRO


INTRODUCTION

Use of Computers in Structural Design of Buildings

• Computers can perform lengthy & tedious computations

at a very high-speed therefore computer programs are

used for analysis & design of structural members.

• Computer results are dependent on effectiveness of

software as certain assumptions are made in the

development of programs.

• But with experience & regular revision & updating, these

computer programs can be relied upon to give accurate

results.


INTRODUCTION

• Limitations of Hand Computation Methods

– Applicable for small problems

– Tedious for even medium sized problems

– 3-d analysis almost impossible

• Advantages of Computer Analysis

– Matrix methods of structural analysis

– Development of numerical techniques

– Finite element method

– 3-d analysis can be done.


STAAD PRO

Use of Computers in Structural Design of Buildings

• STAAD PRO is a very powerful software which can

be used fro 3-D analysis & is useful for analysis and

design of multi-storied buildings.

• Full range of analysis including static, P-delta,

response spectrum, time history, cable etc. and

• Steel design ,

• Concrete design and

• Timber design is available in STAAD PRO


STAAD PRO

STAAD PRO

It provides the user environment for –

• Model development (Graphical as well as input

editor)

• Model visualization on screen,

• Analysis & design, and

• Verification

• Pre and Post Processor

• Isometric and perspective view and 3D shapes.




• Object-oriented 2D/3D graphical model generation

with Flexible zoom, pan and multiple views.

• Built-in command file editor for text edit.

• Customizable structural templates for creating a

model.

• Unlimited Undo and Redo

• Pull down menus, floating tool bars, tool tip help &

quick data input through spreadsheets.

• FPS, Metric or SI units.




• Supports truss & beam members, plates, solids, linear

and non-linear cables & curvilinear beams.

• Advanced automatic load generation facilities for

area, floor & moving loads.

• Display of loads, supports, properties, joints,

members, etc

� Rectangular and also cylindrical & reverse cylindrical

coordinate systems with mix and match capabilities. c




• Easy auto mesh & auto refinement of user-defined

polygonal element boundary by simple mouse clicks,

including openings & column/ wall lines.

• Joint, member/ element, mesh generation with flexible

user-controlled numbering scheme

• Import/ Export DSF, DWG and Excel files.

• Presentation quality printer plots of geometry and results

as part of run output.

• Efficient algorithm minimizes disk space requirements.




Model Generation

� Easy “snap-to” construction grid for laying out beams

and columns on irregular grids.

� Segments of repetitive geometry may be used to

generate complex structural models.

� Generate, copy, repeat, mirror, pivot, etc. for quick and

easy geometry generation.

� Comprehensive graphical editing.

� Library of commonly used structures and display of

properties, loadings, supports, orientations etc.




Model Generation

� Graphical specification & display of properties,

loadings, supports, orientations etc.

� Import/Export of Auto Cad 2D/3D files to start model.

� Access to text editor to modify model quickly through

command syntax.

� User-controlled scale factors for deflected shapes.

� Customizable node/member & renumbering scheme.

Analysis & Design


• Static Analysis

– Primary

– P-delta

– Non-linear

– Non-Linear Cable

• Basic Design

– Steel

– Concrete

• Dynamic analysis

– Rayleigh

– Eigen Solution

– Time History

– Response Spectrum

• Special Design

– Aluminum

– Timber

– Transmission Tower

Structure Types


Structural Types:

d

d

d

d

d

d

d

ud

d

u

u

u

d

u

u

GX

GY

GZ

d

X

Z

TRUSS (2D) TRUSS (3D)

PLANE (2D) SPACE (3D) FLOOR

Element Types


• Structural Elements

• Line

• Truss

• Beam

• Surface

• Plate/ Shell

• Surface

• Solid

d

d

d

d

u

u

u

u

d

u u

d

d

d

d

d

Boundary Condition


• Fully Restrained

• Partially restrained w/ Springs

• Inclined

• Multilinear

• Partially Restrained

Some Special Supports –

• Elastic footing

• Elastic Mat

• Multi-linear Spring

• Inclined Support

Using STAAD PRO

Using STAAD PRO for Analysis & Design of Building –

Steps In Design

• Manual design of slabs, staircases, chajjas, lintels etc.

• Preparing structural model of building

• Preparing data for STAAD PRO program at all levels

i.e load intensities at all floors & wall load etc.

• Perform Analysis after complete feeding of data and

obtain the analysis out-put.

• Once analysis is completed for different load

combination design is performed for load envelope.


Using STAAD PRO

Using STAAD PRO for Analysis & Design of Building

– Steps In Design

• STAAD PRO gives beam and column designs at all levels &

column reactions for design of foundations.

• Manual design of footings.

• After design by STAADPRO we note down area of steel for

column at various levels & grouping is done.

• For beams we note down main reinforcement & Shear

reinforcement at various sections & do detailing.

• Detailing of reinf done manually as per SP34 & IS 13920

• Prepare structural drawings using AutoCad or manually.


Steps for Static Analysis

• Geometric Modeling

• Material Properties

• Sectional Properties

• Supports : Boundary Conditions

• Loads & Load combinations

• Special Commands

• Analysis Specification

• Design Command


Geometric Modeling

• Nodal Co-ordinate Data

• Selection of Elements : Element Library

• Beam Elements : Beams, Columns, Truss Members

• Plate Elements : Structural Walls, Floor Slabs

• Plane Stress Elements : Shear Walls, Floor Slabs Acting

As Rigid Diaphragm To Lateral Loading

• Solid Elements : Thick Raft, Block Foundations

Surface Element:

– Rectangular

– Default Division 10X10, no. can be controlled

– Mainly introduced for Shear Wall Modeling & Design


Sectional & Material Properties

• Beam Elements : Cross Section• Plate Elements : Thickness• Solid Elements : NIL• Material means a set of:

– Modulus of Elasticity– Poisson’s Ratio– Weight Density– Thermal Coefficient – Damping Ratio– Shear Modulus

• Geometric Constant– Beta (�) Angle– Reference Point


Axis & Sign Convention


• Local & Global Axis System for Member– Depends on Connectivity

– Upward Global Axis



•Different Axis Systems for Member Loads (Global-Y is Vertical)

Local Y Direction (UNI Y -2) Global Y Direction (UNI GY -2)

Projected Y Direction (UNI PY -2) Theory Projected Y Direction (UNI PY -2) Graphics



• Member End Forces - Transnational Degrees



Member End Forces – Rotational Degrees

LoadsSelf Weight

Joint Loads

– Concentrated Load & Moments

– Support Displacement Loads

Member Loads

– Uniform Force & Moment (Full / Partial) (d1, d2, d3)

– Concentrated Force & Moment (d1, d2)

– Floor Load & Area Load (new GX, GZ Floor Load)

– Linear Varying & Trapezoidal Load

– Pre-Stress / Post-Stress Load

– Hydrostatic Trapezoidal Load

– Temperature Load (x, y, z)

– Fixed End Load


Loads

Plate Element Loads

Pressure (Full / Partial)

Concentrated Force (x, y)

Trapezoidal & Hydrostatic

Trapezoidal Load

Surface Element Pressure

Generated Loads

Wind Load

Seismic Co-efficient Method

Repetitive Moving Load

Dynamic Loads

Time History

Response Spectrum

Combined Effect of

Loads

Combination (Algebraic,

SRSS, ABS)

Repeat Load


Codes & Shapes

• Design Codes

– IS 800 for Steel design

– IS 456 & 1893 for RCC design

• Shapes supported

– Shapes include I-Beams with or without cover plates,

channels, angles, double angles/ channels, pipes

and tubes (HSS Sections) for Steel design

– Also built-in steel tables

– Design of circular, rectangular, I and L shaped,

trapezoidal and Tee sections for RCC design.


Earthquake Analysis

• IS 1893 – 2002 (Part 1) Parameters:

– Seismic Zone Coefficient

– Response Reduction Factor

– Importance Factor

– Soil Site Factor

– Type of Structure

– Damping Ratio (obtain Multiplication Factor for Sa/g)

– Depth of Foundation below Ground Level

• Reduction of Ah due to Depth of Foundation

• Acceleration as Function of Time Period and Soil Type

• Evaluation of Base Shear

• Distribution of Lateral Storey Forces


Typical Command SequenceSTAAD SPACE

UNIT METER KN

JOINT COORDINATES

MEMBER INCIDENCES

MATERIAL CONSTANTS

MEMBER PROPERTY

SUPPORTS

DEFINE 1893 LOAD

ZONE…. RF….. I ….

JOINT WEIGHT

LOAD 1 SEISMIC X DIRECTION

LOAD 2 SEISMIC Z DIRECTION

LOAD 3 LOAD

SELFWEIGHT

LOAD 4 ….

LOAD COMB 11

PERFORM ANALYSIS

PRINT SUPPORT REACTION

START CONCRETE DESIGN

CODE INDIAN

FC ….. ALL

FYMAIN ….. ALL

FYSEC …. ALL

DESIGN COLUMN

DESIGN BEAM

END CONCRETE DESIGN

FINISH
