Project 1_Comparative study of different storey buildings for Seismic forces
PROJECT-1
AIM: Comparative study of different story buildings for Seismic forces.
INTRODUCTION:
Factors influencing the dynamic characteristics of a building
Factors influencing the Natural Period of a building
Factors influencing the Mode shape of oscillations
Building:1
2storeys
column dimensions = 400 x400
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 2 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
Building:2
5storeys
column dimensions = 400 x400
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 5 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
Building:3
5 storeys
column dimensions = 550 x300
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 5 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
building:4
5 storeys
column dimensions = 300x550
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 5 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
Building:5
10 storeys
column dimensions = upper 5 storeys = 400x400,Bottom 5 storeys= 600 x 600.
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 10 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
Building:6
10 storeys
column dimensions = 600x600
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 10 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
Building:7
25 storeys
column dimensions = upper 5 storeys = 400x400,middle 10 storeys= 600 x 600,Bottom 10 storeys = 800 x 800
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 25 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
Building:8
25 storeys
column dimentions=800x800
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 25 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
Building:9
25 storeys
building with im[posed mass 10% larger than building -8,
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 25 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
building:10
25 storeys
building with im[posed mass 20% larger than building -8,
PROCEDURE:
1. choose a building with 4grids along the x direction and 3 grids along y direction to create 2 story building,
2. created the materials (concrete, Reabar), sections(beams, columns, and slabs),
3. assign the loads with load combinations inclusion of dead, live, wall, EQX, and EQY.
4. Apply the mass source,
5. apply the loads for beams wall load of 10KN(UDL),(slab load with 3KN UDL shell loads).
6. select the slab sections assign the diaphragm,
7. run the analysis and check the time period.
| Criteria | Model | Analysis results |
| Effects of stffness on time period | Building-5(10 storey with varying column size) | 1.73s |
|
Building -6 (10 storey with uniform column size) |
1.73s | |
| Effect of stiffness on time period |
Building-7 (25 storey with varying column size) |
4.17s |
|
Building-8 (25 storey with uniform column size) |
4.41s |
|
| Effect of mass on time period |
Building -8 (25storey with 3KN/sq.m imposed load) |
4.41s |
|
Building -9 (25storey with 3.3KN/sq.m imposed load) |
4.42s | |
|
Building -10 (25storey with 3.6KN/sq.m imposed load) |
4.43s | |
| Effect of building height on time period |
Building-1 (2storey) |
0.5s |
|
Building-2 (5storey) |
1.03s | |
|
Building-6 (10 storey) |
1.73s | |
|
Building-8 (25storey) |
1.41s | |
| Efeect of column orientation on time period |
Building-2 (all floors column size 400x400) |
1.03s |
|
Building-3 (all floors column size 550 x 300) oriented in X-direction. |
1.145s | |
|
Building-4 (all floors column size 300x550) |
1.12s | |
| Effect of flexural stiffness of strctural elements on mode shapes |
Building-2 1.flexural stiffness of beams close to nil |
2.62s |
| 2. Full flexural stiffness of beams | 1.03s | |
| Effect of axial stiffness of vertical members on mode shapes |
Building-7 1.Axial c/s for columns is close to nill |
5.99s |
| 2.full axial c/s for columns(regular) | 4.41s | |
| Effect of degree of fixity at column based on model shape. |
Building-2 1.column support pinned(regular) |
1.03s |
| 2.column support fixed | 0.94s |