Modelling of 25 storey building with the specified properties using ETABS

Aim: Model a 25 storey building on ETABS with structural properties as specified below. Ground floor or plinth floor level can be taken at a height of 1.5 metres from the base. Each of the successive 25 storeys has a storey height of 3 metres.

Given details:

Structural Element Sizes

• Beams: 300 × 400 mm
• Columns : 800 × 800 mm
• Slab: 150 mm thick

Material Properties

• Grade of Concrete: M30
• Grade of Steel Reinforcement Bars: Fe 415

Loading

• Dead Load on beams from infill wall: 10 kN/m
• Live load on floor: 3 kN/m2

Procedure:

• Open ETABS software, and select new model
• Use the built in settings with
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• Give the 5grids in x direction and spacing each 4m
• Give the 4grids in y direction and spacing each 4m
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• Click on story data and give the height of each floor.
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• And assign all story to 1st story.
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• Know we need to input the material property, for this go to difne tab and select the material properties and add it.
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• the material properties are added.
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• Now we need to add the frame members of columns, beam, and slabs. Go to define tab and click on selction properties and select frame section.
• And click on add new property and assign name and material type.
• And click on show rebar in that give the rebar for it.
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• And beam and column is added.
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• Go to define tab and click on selction properties and select slab section.
• And assign the thickness for slab.
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• So all the properties are added correctly. now we need to the structural members.
• Click on quick draw column option and placed the column at the center of grid
• Next, we need to place the beam in position, for this also quick draw beams option can be chosen.
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• Now. we need to create the slabs, for this initially change the all storeys option to similar storeys Which may exclude the base and plinth level.
• Then, choose quick draw floor or wall option to easily draw the floor slabs.
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• Go to assign tab and select the Restraints.
• And select the pinned joint.
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• Now we need to assign loads to frame.
• Go to define tab and click on load patterns and add the loads
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• And modify lateral loads, and click ok.
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• Now assign the shell load on the floor and click apply.
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• Now assign the load on beams of brick load.
• And give the load 10KN/M.
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• Go to define tab and click on mass sources.
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• And click on modify mass sources
• Give the live, Dead, brick load and click ok.
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• Go to define tab and click on load combinations.
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• Click on add default design combinations
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• Select all floors
• And go to assign tab click on shell and select diaphragms.
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• Go to analyze tab click check model and select all and click ok.
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• Go to display tab and click on show table.
• And select structural output and click on model information and select model period and frequencies.
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• Modal period and Frequencies
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• Modal participating mass ratio
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• Go to display tab and select story response plot.
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