Project 1_Comparative study of different storey buildings for Seismic forces
1. Aim - Draw a building as per given above in the project
Procedure - Select a new model
Select a grid and story
Now add the material of concrete and rebar and add column and beam
Add Column beam and slab to it
Add load pattern and combination to it
Select a diaphragms from shell load
and run analysis
and similarly draw remaining building by just editing the grid and story building
Result from all observation
Effect of stiffness on time period in E & F AND G & H BUilding
Building E - 1.73 s There is Difference in time period as small story less time period and for higher time period we have
Building F - 1.73 s Greater time period becoz in small story there is no significance difference in column size where as
Building G - 4.17 s higher story column we have different column size are more stable because uniform column mass is
Building H - 4.41 s directly proportional to lateral load which induces more lateral displacement to it .
Efffect of mass time period
Building H - 4.41 s there is not much time difference in this
Building J - 4.42 s
Building K - 4.43 s
Effect of Building height on Time period
Building A - 0.5 s As height increase time period also increases
Building B - 1.03 s
Building F - 1.73 s
Building H - 4.41 s
Effect of column Orientation on Time Period -
Building B - 1.03 s Responce of bldg in all direction is similar in C and D Larger column in X dirction and smaller diretion
Building C - 1.14 s S it will be higher in bldg in c AND d
Building D - 1.12 s
Effect of Flexural Stiffness of structure element on mode Shapes
Building B -
Flexural Stiffness of Beam Close to Zero Inertia - 2.62 s Stiffness is vital element to resist the beam
Flexural Stiffness of Beams - 1.03 s
Effect of Axial Stiffness of vertical member on mode shape
Building H -
Axial cross section For Cloumn is close to nil - 5.99 s Play vital role
Full Axial Cross SEction for column - 4.41 s
Effect of Degree of Fixity at column Base on Mode shape
Building B
Column Support pinned - 1.03 s
Column Support Fixed - 0.941 s