Project 1_Comparative study of different storey buildings for Seismic forces
Aim:
To Compare fundamental natural periods of buildings X, Y and Z. using ETABS.
Procedure:
Building X:
Step 1:
1) Go to Define -> Material Properties -> Concrete material
2) Create new properties as shown below.
Step 2:
1) Go to Define -> Section Properties -> Frame Sections
2) Create new properties by Add new property and choose Rectangular
3) Add the new column dimension of 800 x 800. Name it as Column.
Step 3:
1) Go to Define -> Section Properties -> Frame Sections
2) Create new properties by Add new property and choose Rectangular
3) Add the new Beam dimension of 550 x 300. Name it as Beam.
Step 4:
1) Go to Define -> Section Properties -> Slab Sections
2) Edit Slab 1 Property & Slab thickness as 150mm.
3) Add the created Beams Column & Slab to created grid.
Step 5:
1)Define the Load cases and Mass source data for seismic load.
2) Assign the brick load of 10 kN/m2 on beam meber.
2) Assign live load of 3 kN/m2 on floor.
4) Click on Run Analysis.
5) Add diaphragms to the each floors.
6) Analysis of model is completed.
Step 6:
1) Go to Display -> Show table -> And click on Modal participating ratio from Structural output.Click ok.
Building Y:
Step 1:
1) Create copy of Building X another multi storey building.
2) Go to edit -> Add stories & Grid system -> Edit story data.
3) Add multiple story to the building.
Step 2:
1) Define another properties for beam & column.
2) Assign the new properties.
Step 3:
1) Assign the Diaphragm & load loading on structure.
2) Run analysis.
Step 4:
1) Go to Display -> Show table -> And click on Modal participating ratio from Structural output.Click ok.
Building Z:
Step 1:
1) Create copy of Building X another multi storey building.
2) Go to edit -> Add stories & Grid system -> Edit story data.
3) Add multiple story to the building.
Step 2:
1) Define another properties for beam & column.
2) Assign the new properties.
Step 3:
1) Assign the Diaphragm & load loading on structure.
2) Run analysis.
Step 4:
1) Go to Display -> Show table -> And click on Modal participating ratio from Structural output.Click ok.
Conclusion:
1) When comparing these building there is significant difference due to different column sizes. The fundamental period of building X is 0.36 and for Y is 0.48. similarly for building Z is 3.8.