Challenge

Project 1 - MODELLING, ANALYSIS & DESIGN OF TALL BUILDINGS IN ETABS

ANS

THE GIVEN ARCHITECTURAL DRAWING

a. Modelling

To comprehend the architectural plan provided by the architect and look-out for the key information from the drawings.
Import the architectural floor plan (provided by the architect) in ETABS model to start with the modelling.
Create grid lines, story levels & story heights to set-up a project.
Create material definitions for the concrete, rebar & structural steel
Create slab, beam, column & wall properties to be used further in the project.
Model typical floor plate using shell & frame elements as indicated in architectural plan.

model

b. Loadings & Load combinations

Define load patterns for gravity cases
Define load patterns for the lateral load cases using the wind & seismic parameters provided.
Create service & ultimate load combinations as per IS 456:2000
Define mass source for the earthquake loads

ASSUME THE AREA -GUWAHATI

SEISMIC ZONE- 5 ( 0.36 )

SOIL TYPE- MEDIUM

IMPORTNCE FACTOR- R=1

TIME PERIOD IN X- TX = 0.09H/`sqrtd`= 0.09*32.85/`sqrt37.11`= 0.48 s

TIME PERIOD IN Y -TY = 0.09h/`sqrtdy`= 0.09*32.85/19.69 = 0.67 s

BASIC WIND SPEED = 50 M/S

K1(RISK FCTOR) = 1 TABLE 1,CLAUSE 5.3.1

K2 (TERRAIN ROUGHNESS AND HEIGHT FACTOR) = 0.91 TABLE 2 5.3.2.2

K3 (TOPOGRAPHY FACTOR) = 1.0

K4(IMPORTANCE FACTOR FOR CYCLONIC REGION) = 1.0 ( CLAUSE 5.3.4 )

ULTIMATE LOAD COMBINATION

SERVICE LOAD COMBINTION

MASS SOURCE

c. Structural Analysis

Obtain the shear force & moment diagram for the floor beams & columns
Check the gravity load path in the structure if it follows the designer’s intent.
Perform quick hand calculations to confirm the base reactions for the gravity load cases.

MOMENT DIAGRAM

SHEAR FORCE DIAGRAM

TOTAL VERTICAL GRAVITY FORCE > REACTION FORCE

. Design of structural members

Ship work like this
in your own course.