Modelling of 25 storey building with the specified properties using ETABS

AIM

To 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.

INTRODUCTION

The model is created using ETABS software and the procedures are explained in detail.

PROCEDURE

Open the ETABS software.

Create a new model in etabs software.

set the metric conversion as per the indian standard.

then click ok.

select the grid system as siven in the qusetion spacing of 4m distance.

and select the storey height of the building

and select the pilnt level as 1.5m

select the height of the building as 3m

each 25 storey has 3m height of the building as shown in the fig below.

after selecting ok the grid system of plan and 3d plan is visible as shown in the fig below.

select DEFINE in the ribbon bar and select and add the properties of column and beam.

select the depth and width of beam.

and select the column 800mm x800mm

afetr completing column and beam select the slab properties in the define ribbon bar.

and select the slab section.

A tab appears of slab properties as shown in the fig below.

after completing slab propeties and now the assign the load properties as shown in the fig below.

select the mass propeties.

select the cente of mass of structure.

assign the load cases and load combination of the properties

select the column in the plan as shown in the fig below.

after completion of column select the properties of beam as shown in the fig below.

after completion column and beam select the slab properties in the model as shown in the fig below.

assign the slab of 3 kn in the livelload of slab and beam

and assign the beam 10kn/m in the beam load.

select the shell properties in the and select the diaphram of the model of the mass of the building.

run the application.

modal factor table period and frequency.

CRITERIA		DESIRABLE SOLUTION	RESULT
Fundamental transaltional natural period	x- direction	4.4 seconds	4.416
	Y - direction	4.2 seconds	4.22
Torsional regularity	IS 1893-20(part 1) table 5	Torsional mode time period should be lesser than x and y direction line period	yes
Vertical irregularity	IS 1893-20(part 1) table 6 clause 7	Final three modes together should contribute at least 65% in mass participation factor in each principal direction	yes
		Fundamental lateral neutral period in two principal plane direction are away each other by atleast 10%	no
Inter - storey drift	IS 1893-20(part 1) table 6 clause 7.11.1.1	Storey drift shall not exceed 0.004 times the storey height for base shear with base no load factor (4x10-3)	yes

RESULT ; The model of 25 storey building is completed using etabs is completed.