Project 1_Comparative study of different storey buildings for Seismic forces
Project-1 (solution) :-
Aim:-
To analyze the various characteristics of the building in the terms of various aspects which is related to seismic analysis of highrise building by using the software ETABS.
Procedure:-
i) The building with the column size of 400x400 with the two floors including plinth level.
2) The building with column size of 400x400 with the five floors including plinth level.
3) The building with column size of 550x300 with the five floors including plinth level
4) The building with column size of 550x300 (with 90degrees orientation) with the five floors including plinth level
5) The building with column size of 600x600 with the five floors and column size of 400x400 with the next five floors, total building
floors of 10.
6) The building with column size of 600x600 with the five floors and column size of 400x400 with the next five floors, total building
floors of 10.
7)
8)The building with column size of 800x800 with the 25 floors
9)The building with column size of 800x800 with the 25 floors with shell load increment of 10% (3.3)
10)The building with column size of 800x800 with the 25 floors with shell load increment of 20% (3.6)
So now we can analyze the every detail for required designs.
| CRITERIA | MODEL | ANALYSIS RESULT | CONCLUSION |
| EFFECT OF STIFFNESS ON TIME PERIOD | BUILDING-E WITH 10 STOREY WITH VARYING COLUMN SIZE | 1.731 S | DUE TO CHANGE IN COLUMN SECTION THE SELF WEIGHT WILL BE REDUCED & STRUCTURE WILL BE REDUCED & STRUCTURE WILL SAFE |
| BUILDING-F WITH 10 STOREY WITH UNIFORM COLUMN SIZE | 1.707 S | ||
| BUILDING-G (25 STOREYS WITH VARYING COLUMN SIZE) | 4.087 S | ||
| BUILDING-H (25 STOREYS WITH UNIFORM COLUMN SIZE) | 4.416 S |
TABLES
ANALYSIS RESULTS
STRUCTURE OUTPUT
MODAL INFORMATION
MODEL PERIOD
RIGHT CLICK (SHOW TABLE)
| CRITERIA | MODEL | ANALYSIS RESULT | CONCLUSION |
| EFFECT OF MASS ON TIME PERIOD | BUILDING - H (25 STOREY WITH 3KN/SQM IMPOSED LOAD) | 4.41 S | MASS IS DIRECTLY PROPORTIONAL TO THE LTERAL FORCE,SO FAR THE TIME PERIOD WILL INCREASE |
| BUILDING - J (25 STOREY WITH 3.3KN/SQM IMPOSED LOAD) | 4.425 S | ||
| BUILDING - K (25 STOREY WITH 3.6KN/SQM IMPOSED LOAD) | 4.435 S |
| CRITERIA | MODEL | ANALYSIS RESULT | CONCLUSION |
| EFFECT OF BUILDING HEIGHT ON TIME PERIOD |
BUILDING - A (2 STOREY) |
0.5 S | HEIGHT OF BUILDING IS DIRECTLY PROPORTIONAL TO THE TIME PERIOD |
|
BUILDING - B (5 STOREY) |
1.036 S | ||
|
BUILDING - F (10 STOREY) |
1.707 S | ||
|
BUILDING - H (25 STOREY) |
4.416 S |
| CRITERIA | MODEL | ANALYSIS RESULT | CONCLUSION |
| EFFECT OF COLUMN ORIENTATION ON TIME PERIOD | BUILDING-B (ALL FLOORS COLUMN SIZE 400 X 400) | 1.03 S | THE EFFECT OF COLUMN ORIENTATION IS LIED ON FLEXIBLE BEHAVIOUR OF BUILDING |
| BUILDING-C (ALL FLOORS COLUMN SIZE 550 X 300) ORIENTED IN X-DIRECTION | 1.145 S | ||
|
BUILDING-D (ALL FLOORS COLUMN SIZE 300 X 550)ORIENTED IN X-DIRECTION |
1.12 S |
DISPLAY
STOREY RESPONSE PLOTS
CASE/COMBO EQX,EQY
| CRITERIA | MODEL | CASE | ANALYSIS RESULTS | CONCLUSION |
| EFFECT OF FLEXURAL STIFFNESS OF STRUCTURAL ELEMENTS ON MODE SHAPES | BUILDING-H | ARIAL C/S FOR COLUMNS IS CLOSE TO NIL (ZERO AXIAL AREA) | 5.991 S | AXIAL STIFFNESS OF COLUMN (EA) PLAYS VITAL ROLE IN A TIME PERIOD,GRAVITY DESIGN HAS SIGNIFICANT ROLE |
| FULL AXIAL C/S FOR COLUMNS (REGULAR) | 4.41 S |
BY DEVREASING AXIAL STIFFNESS OF COLUMN
DEFINE
SECTION PROPERTIES
REQUIRED COLUMN SIZE
PROPERTY MODIFIERS
MODIFY/SHOW MODIFIERS
CROSS SECTION (AXIAL)AREA
0.1-10%
| CRITERIA | MODEL | CASE | ANALYSIS RESULTS | CONCLUSION |
| EFFECT OF DEGREE OF FIXITY AT COLUMN BASE ON MDE SHAPE | BUILDING - B | COLUMN SUPPORT (PINNED REGULAR) | 1.03 S | MORE FIXITY LESSER DEFLECTION IF THE TIME PERIOD HAS CHANGED |
| COLUMN SUPPORT FIXED | 0.941S |
PLAN
BASE
SELECT ALL JOINTS
ASSIGN
JOINT
RESTRAINTS
CHOOSE FIXED ONE
APPLY
OK
RESULT:- i got to know how to get analysis results by using ETABS.