Modeling With ETABS

Getting Started with ETABS/ Modeling in ETABS/ 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. 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 building’s geometry (it’s footprint, including the adjacent
structures, 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

Parameters
Columns:> 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


A New Model Initialization window 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

or
Etabs custom grid spacing


Define Properties

1. Material Properties
2. Frame Sections
3. Slab/Wall Sections
4. Static Load Cases
5. Load Combinations

1-Material Properties

Add New Material

Or
Define Material Properties
Suppose a Concrete of Fc'=4ksi

2-Frame Sections
Add 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 Load
SDL = Service Dead + Live Load



Draw Coloumn,beams,shear walls......to be continued...