Structural Modelling using Etabs 2018

AIM:

• To model and analyze the G+7 residential building from the given architectural drawings using the ETABS 2018.
• To Run a modal response spectrum analysis and check analysis results of the Etabs model for inter-storey drift requirements, vertical & planar irregularities, minimum shear wall requirements, maximum axial load ratio for column and shear walls, effective moment of inertia for beams and columns etc.
  
  

INTRODUCTION:

• ETABS is an engineering software product that caters to multi-story building analysis and design.
• Modeling tools and templates, code-based load prescriptions, analysis methods and solution techniques, all coordinate with the grid-like geometry unique to this class of structure.

PROCEDURE:

• First we have open the etabs software.

• Then click on the New model option at the left side to create the new model, as shown below.

• Then choose grid only to create grids, to add grids click on edit grid data.

• Then click on edit storey data to add number of story and story height.

• Firstly need to define the material properties, so click on material properties to in define from menu bar to define the material properties.

• To add new material property click on add new material

• After creating the material properties need to define frame sections

• To create frame sections go to define and click on frame section in section properties

• Enter the property name for each frame sections and choose the material grade

• Enter the depth and widt of the sections

• click on modify rebar data to specify the rebar data

• In that choose design for baem if its a column section then choose column

• For this section its a beam so click on beam and enter cover details

• Also specify the rebar materilal from the dropdown selection

• After entering all the details click ok

C400x600

• Then need to define slab sections

• For that go to define and select slab sections in sections peroperties.

• Add peoperty name for slab

• Select the slab material

• And choose modeling type as membrane

• Then enter the thickness of the slab

• After that need to define property for shear wall

• For that go to define click on wall sections in section properties to define shear wall properties.

• Click on add new property to t define shear wall property

• To define load pattern click on load pattern on in define in menu bar

• click add to add the new loads

• Select the type of load and code from the dropdown

• Then we need to define the mass source

• Fo that go to define and click on mass source.

• After defining all the sections, materials and load patterns need to start modeling

• First to ceate columns click on quick draw column in the left side window

• Befire that make sure the work mode is switched to all stories

• Then select the column property to draw and draw the columns as per their respective positions.

• In the same manner create the beams by clicking quickdraw beams in left side panel

• The beams need to draw in all stories mode

• Add the secondary beams with respective to proper dimensions.

• To rotate the columns select the columns in the window

• Then go to frame and click on local axes to rotate column

Enter the angle in rotate by angle enter as 90 degree

• Click on draw wall to draw the shear wall

• Draw the shear wall with respect to their location and length

• After adding the frames need to draw slabs

• Use quick draw to draw slabs quickly

• In place of cut slabs use poly draw slab

• To assign the loads now need to select frames

• The wall load is acting only on frames so selct the frames

• The frames are selectes by using object type

• Select the load pattern as wall

• Enter the uniform load value and click ok to assign

• In the similar way, select the slabs to assign the live load

• Dont select the stair and lift slab

• Assign live load as 2 and also floor finish load

• The below image shows the elevation of the model

• For slabs we need aggign the diaphragms

• Select the slabs using object selection

• Then go to assign shell and click on diaphragms

RESULT

The G+7 residential appartment building has been modelled and analyzed successfully using the ETABS 2021.