Project 1_Comparative study of different storey buildings for Seismic forces

Factors influencing the dynamic characteristics of a building

• Building oscillate during earthquake shaking.The oscillation causes inertia force to be induced in the building.
• The intensity and duration of oscillation and the amount of inertia force induced in a building depends on featured of building called dynamic characteristuics.
• The important dynamic characteristics of building are modes of oscillation and damping.
• Every building has a number of natural frequency at which it offers minimum resistance to shaking induced by external effects and internal effects.
• Each of these natural frequency and the associated deformation shape of a building consumes natural model of oscillation.
• The mode of oscillation with the smallest natural frequency is called as fundamental mode and natural period T is called as fundamental natural period.

Factors influencing the Natural Period of a building

• Effect of stiffness
• Effect of mass
• Effect of building height
• Effect of column orientation

Factors influencing the Mode shape of oscillations

• Effects of flexural stiffness of structural elements
• Effect of axial stiffness of vertical member
• Effect of degree of fixity at column base.

Aim:

To design a multistorey building with ETABS of different building storey and column

Natural period of each building,

A=0.5 s

B=1.03s

C=1.14s

D=1.12s

E=1.73s

F=1.73s

G=4.17s

H=4.416s

J=4.81s

K=4.85s