Staad Pro- An Overview

E4E4-E5 CIVIL (TECHNICAL) STAAD PRO – An Overview

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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.

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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

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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.

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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. For internal circulation of BSNLonly

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

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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. For internal circulation of BSNLonly

Features of STAAD PRO Features of STAAD PRO • 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. For internal circulation of BSNLonly

Features of STAAD PRO Features of STAAD PRO • 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

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Features of STAAD PRO Features of STAAD PRO • 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.

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Features of STAAD PRO Features of STAAD PRO 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. For internal circulation of BSNLonly

Features of STAAD PRO Features of STAAD PRO 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.

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Analysis & Design • Dynamic analysis – Rayleigh – Eigen Solution – Time History – Response Spectrum

• Static Analysis – Primary – P-delta – Non-linear – Non-Linear Cable • Basic Design – Steel – Concrete

• Special Design – Aluminum – Timber – Transmission Tower

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Structure Types Structural Types: d

d

GY

dX dZ

GX

d

GZ

TRUSS (2D)

TRUSS (3D)

d

d

d

u u

u

u

d

d u

u

d

PLANE (2D)

SPACE (3D)

FLOOR

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Element Types • Structural Elements •

Line •

d

Truss

d u d u

u

d

•

Beam d

•

u

Surface

d u

u

d

•

Plate/ Shell

• Surface

d

d

d

•

Solid For internal circulation of BSNLonly

Boundary Condition • Partially Restrained

•

Fully Restrained

•

Partially restrained w/ Springs

•

Inclined

•

Multilinear

Some Special Supports – • Elastic footing • Elastic Mat • Multi-linear Spring • Inclined Support

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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. For internal circulation of BSNLonly

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. For internal circulation of BSNLonly

Steps for Static Analysis • • • • • • • •

Geometric Modeling Material Properties Sectional Properties Supports : Boundary Conditions Loads & Load combinations Special Commands Analysis Specification Design Command

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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

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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

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

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

Local Y Direction (UNI Y -2)

Projected Y Direction (UNI PY -2) Theory

Global Y Direction (UNI GY -2)

Projected Y Direction (UNI PY -2) Graphics

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Axis & Sign Convention • Member End Forces - Transnational Degrees

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Axis & Sign Convention Member End Forces – Rotational Degrees

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Loads Self 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 For internal circulation of BSNLonly

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

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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.

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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 For internal circulation of BSNLonly

Typical Command Sequence STAAD 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

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