Modelling of 25 storey building with the specified properties using ETABS

CHALLENGE WEEK - 6

Etabs

Question no.1: 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.

• Aim:

• To model a 25storey building on Etabs.
• To follow suggested parameters.

• Procedure:

• To create a new model.
• Set up the basic settings
• The basic parameter setting is to be done in "use built in settigs"
• The setting is shown below.

• After the basic parameter settings are done .
• Then we need to create the grids and storey settings.
• the settings are to be done using custom grid settings and custom storey data.

• After chooseing customization of grids and storey
• We now will get an interface to work with.
• Then after this choose define tab in tool bar.
• In define choose material properties.
• Defining material properties which are to be used are the next step
• Then add new properties.
• To create material like concrete and steel to be used in the model.

• Then after this we need to create the modelling elements such as column, beams and slabs.
• For that go to "define" and " section properties" and then "frame sections"for columns and beams.
• Then create beams and column elemets with required sizes and other parameters.

• After creating frame section, now we need to create slab.
• For that go to slab section in section properties.

• After creation of material and elements.
• We need to create load pattern.
• In that required loads are added.

• And then we need to go for mass source.
• After completeing the process. Now we can the model teh structure
• By picking up quick draw tools.
• And modelling the structure.
• After placing the components.
• Wen can now add the load action.
• By assigning frame loads and shell loads.
• After the loads been added.
• We can go for diaphrgm..
• Then after these process we can run the analysis

• Result:

• Thus we have created the project file with proper template.
• We have named the project appropriately.
• All the procedure steps were attached step by step.
• And then cwe can gain the results required from the analysis.

• Analysis result:

• Fundamental translational natural period:

• Desired solution:

1. X Direction = 4.4 sec
2. Y Direction = 4.2 sec

• Exercise result:

1. X Direction = 4.41 Sec
2. Y Direction = 4.22 Sec

• Torsional irregularity:

• Desired solution:

1. IS 1893-2016(Part-1) Table-5 : Torsional mode time period should be lesser tahn X and Y direction time periods.

• Exercise result:

1. Satisfies "IS 1893-2016(Part-1) Table-5 : Torsional mode time period should be lesser tahn X and Y direction time periods."

• Vertical Irregularity:

• Desired solution:

1. IS 1893-2016(Part-1) Table-6 clause-7 : First three modes together should contribute at least 65% in mass participation factor in each principle direction.
2. Fundamental lateral natural periods in two principles plane directions are away from each other by at least 10%

• Exercise result:

1. Yes
2. No

• Inter-Storey Drift:

• Desired solution:

1. Storey drift shall not exced 0.004times the storey height for base shear with no load factor(4x10^-3)

• Exercise result:

1. Yes

• Result:

• The model was created.
• Suggested paramters were used.
• Analysis was run on the model using the Etabs
• And the results from the analysis was updated