Modeling With ETABS ETABS allow the users to 1. Create and modify computer models. 2. Create structural elements (columns, slabs, shear-walls, beams). 3. Create structural elements (columns, slabs, shear-walls, beams). 4. Analye multiple scenarios and conditions, such as, • !arth"ua#e and wind loads, • $e"uential loadin% of construction, • &hen the analysis is run, it %oes from an ob'ect based to an element bas • he analysis consist of frames, 'oints, lin#ed with shell elements. • esi%n and optimie multistory buildin%s (steel*composite, concrete fram shear-walls.) • All these steps throu%h a sin%le %raphic user interface (+ ). Steps To Model a Building in ETABS 1. efine the buildin% s %eometry (it s footprint, includin% the ad'ac structures, establish the %ridlines, etc/). 2. Consider the implications of the %eo%raphic location of the buildin% 3. !stablish the codes, analysis procedures and desi%n criteria to be a (for e0ample, A$C! , C, C2 , lorida uildin% Code, AC 315). 4. efine the loads (dead, li6e, reduction factors, wind and seismic). 7. Choose the structural elements, such as columns, shear-walls, etc. 8. efine the wor#in% units (for e0ample, lb-in, #ips-ft, etc.). . efine the 6arious concrete stren%ths (e%, 4 psi, 5 psi, etc 5. efine the modulus of elasticity for concrete. 9. efine and create columns sies and stren%ths for all different le6e 1 . efine wall stren%ths and thic#ness. 11. efine steel stren%th and modulus of elasticity.
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Modeling With ETABSETABS allow the users to1. Create and modify computer models.2. Create structural elements (columns, slabs, shear-walls, beams).3. Create structural elements (columns, slabs, shear-walls, beams).4. Analyze multiple scenarios and conditions, such as, Earthquake and wind loads, Sequential loading of construction, When the analysis is run, it goes from an object based to an element based model The analysis consist of frames, joints, linked with shell elements. Design and optimize multistory buildings (steel/composite, concrete frame and shear-walls.) All these steps through a single graphic user interface (GUI).Steps To Model a Building in ETABS
1. Define the buildings geometry (its footprint, including the adjacentstructures, establish the gridlines, etc).
2. Consider the implications of the geographic location of the building.
3. Establish the codes, analysis procedures and design criteria to be applied(for example, ASCE 7, UBC, IBC2000, Florida Building Code, ACI 318).
4. Define the loads (dead, live, reduction factors, wind and seismic).
5. Choose the structural elements, such as columns, shear-walls, etc.
6. Define the working units (for example, lb-in, kips-ft, etc.).
7. Define the various concrete strengths (eg, 4000 psi, 8000 psi, etc.).
8. Define the modulus of elasticity for concrete.
9. Define and create columns sizes and strengths for all different levels.
10. Define wall strengths and thickness.
11. Define steel strength and modulus of elasticity.
12. Place columns and shear-walls upon the gridlines.
Modeling a Building in ETABS
Note:click the images to see it clear
ParametersColumns:> 30" x 30 ''Beams :> 24" x 24 "Shear Walls :> outer walls =84"inner walls=24"Transvers walls = 8"Vertical Spacing b/w Coloumns = 25'Horizontal Spacing b/w Columns = 30'
Define a New Model
ANew Model Initializationwindow opens in which you will be asked to whether to initialize your new model with definitions and preferences with existing .edb file...For instance click no in this problem
Define the ist Story
Choose "Grid Only"Model of ist story properly,run analysis and check for any improperly connected nodes.
Alternatively use ETABS' Uniform grid spacing
orEtabs custom grid spacing
Define Properties
1. Material Properties2. Frame Sections3. Slab/Wall Sections4. Static Load Cases5. Load Combinations1-Material Properties
Add New Material
OrDefine Material PropertiesSuppose a Concrete of Fc'=4ksi
2-Frame SectionsAdd New Rectangular Section
Place The Concrete Coloumn on the Grid
ADD BEAM
ADD WALL SECTIONS
ADD SLAB
Define The Load Cases
Load Combinations
DDL = Design Dead + Live LoadSDL = Service Dead + Live Load
Draw Coloumn,beams,shear walls......to be continued...
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