Projefct 1_Comparative study of different storey buildings for Seismic forces
AIM; TO Provide Factors influencing the Natural Period of a building
- Effect of stiffness on T: Compare fundamental natural periods of buildings E & F as well as G & H. Why is there a marginal or significant difference in the fundamental natural periods?
- Effect of mass on T: Compare fundamental natural periods of buildings H, J and K. Have the buildings become more flexible or stiff due to change in mass?
- Effect of Building Height on T: How does the fundamental natural periods of Buildings A, B, F and H change with change in building height?
- Effect of Column Orientation on T: How does the fundamental natural periods of Buildings B, C and D change with change in column orientation?
BUILDING A
DEFINE; MATERIAL PROPERTIES FOR EVERY FLOOR SAME AS
GO TO DEFINE; SECTION PROPERTIES AND FRAME SECTION
FOR BEAM EVERY BUILDING HAS SAME DIMENSION
FOR COLUMN ,ADD NEW PROPERTIES
FOR SLAB
GO TO DEFINE; SECTION PROPERTY SLAB SECTION
FOR EACH FLOOR SAME
DRAW BEAM ,COLUMN AND SLAB BY THE ICON
ASSIGN PINNED JOINT AT BASE
ASSIGN; LIVE LOAD ON THE SLAB
FOR LOADING ON BEAM
SELECT ALL THE BEAM GO TO SELECT AND PEOPERTIES SELECT BEAM.
ASSIGN DEAD LOAD ON BEAM
GO TO DEFINE ;LOAD COMBINATION AND ADD DEFAULT DESIGN COMBINATION
DEFINE ;LOAD PATTERN
ONLY DEAD AND LIVE LOAD
AFTER RUN ANALYSIS
FRAME HAS BEEN CHECKED AND DESIGNED
MASS RATIO
Ty; 0.327
Tx; 0.320
Tz ;0.280
for building B
GO TO EDIT HEIGHT OF STORY
AND ADD STORY
AFTER RUN ANALYSIS
DEFORMED SHAPE DISPLACEMENT
Ty ;0.669
Tx ; 0.656
TORSION
Tz; 0.576
BUILDING C
COLUMN DIMENSION =550X300
Ty=0.748
Tx= 0.595
Tz=0.587
BUILDING D
COLUMN DIMENSION=300X550
Tx=0.736
Ty=0.609
Tz=0.565
BUILDING=E
AREA OF REINFORCEMENT
Ty=1.732
Tx=1.676
Tz=1.47
BUILDING F
Ty=1.736
Tx=1.678
Tz=1.462
reading of f
BUILDING G 25TH FLOOR
READING OF G
BUILDING H 25THFLOOR
Ty=2.99
Tx=2.871
Tz=2.344
READING OF H
BUILDING J
READING OF BUILDING J
INCRESING IMPOSED LOAD 10%
READING OF K
AFTER IMPOSING INCREASING 20% LIVE LOAD
Time period A Time period B
Ty=0.327 Ty=0.669
Tx=0.321 Tx=0.656
Tz=0.281 Tz=0.576
Time period C Time period D
Ty=0.738 Ty=0.609
Tx=0.595 Tx=0.736
Tz=0.587 Tz=0.565
Time period e Time period f
Ty=1.732 Ty=1.736
Tx=1.676 Tx=1.678
Tz=1.47 Tz=1.462
Time period g Time period h
Ty=4.17 Ty=4.416
Tx=3.98 Tx=4.22
Tz=3.167 Tz=3.285
TIme period J Time period K
Ty=4.425 Ty=4.435
Tx=4.231 Tx=4.24
Tz=3.291 Tz=3.297
Effect of building height on T, OF BUILDING A,B,F AND H
As the building height increase, time period increased.
Efect of column orientation on T, of building B,C,D
When the longer dimension in y axis as in building d, the time period in y axis less compared to x axis.
Time period C Time period D
Ty=0.738 Ty=0.609
Tx=0.595 Tx=0.736
Tz=0.587 Tz=0.565
Effect of mass on T, on building H,J and K
TIme period J Time period K Time period H
Ty=4.425 Ty=4.435 Ty=4.416
Tx=4.231 Tx=4.24 Tx=4.22
Tz=3.291 Tz=3.297 Tz=3.285
as the the mass increased ,time period increased. and we know time period directly propertional to mass,
so value ofT IN building k more than H and J