Modelling of 25 storey building with the specified properties using ETABS
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Modal 25 story Building
Ground to Plinth height = 1.5m
Story Floor to Floor = 3m
Total Story = 25
In X direction grid to grid distance = 4000mm (5Number Grid)
In Y direction grid to grid distance = 4000mm (4Number Grid)
Structural Element sizes
Beams : 300mm x 300mm Columns : 800mm x 800mm Slab : 150mm Thick
Material Properties:
Grade of concrete : M30 Grade of steel : Fe 415
Loadings
Dead load on Beams From infill wall : 10KN/m Live load on floor : 3KN/m2
Building are to be assumed pinned at the base
ALL columns in all story are of the same size ALL beams in all story are of the same size
Checked
The translational fundamental natural period vibration in both the x and y direction is as following
Tx1 = 2.98 s
Ty1 = 3.14s
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Answer ; PLEASE FIND THE ATTACHED FILE OF ANSWER PAPER
1) Open the ETABS software click on new Modal and select the units, databse, steel design code IS 800 and concrete design code IS 456.
2) In new model quick templates Click Custom grid spacing - Grid system data give grid spacing in X and Y direction 4000mm. In X direction 5nos of grid and Y direction 4nos of grid
3) Click quick start rectangular grid i,e Story data enter the story up to 25 and height 3m and plinth 1.5m. all story will be same as story1.
4) Define material properties -Add new material property – Indian – concrete and Grade M30 same way for steel property.
5) Define Section property for beam - size and grade and cover to be specify same way for columns and slab.
6) Define Load Patterns – dead load live load brickwall laod and seismic load in Eqx + & - ve and Eqy + & - ve
7) Fixe the columns by clicking Quick draw column by selecting C800x800 at grid junction by clicking
8) Fixe the Beams by clicking Quick draw beam by selecting B300x400 from grid to grid clicking
9) Fixe the slab by clicking Quick draw floor/ wall by selecting Slab150 clicking center of four beams
10) Assign the Floor load – live load on slabs 3KN/m2 and roof slab 1.5KN/m2 separately
11) Assign the brick wall load 10KN/m on beams by selecting beams
12) Define the mass source
13) Define the Load Combination – Add default design combs
14) Define diaphragms
15) Analysis -Check Modal by selecting all – click OK
16) Run analysis
17) Display Shoe table
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