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From version < 2.1 >
edited by IwonaBudny
on 2018/09/06 14:06
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on 2018/09/06 14:08
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5 5  = 1. Introduction =
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7 +(((
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9 +Seismic calculation is a special case of forced vibration calculation, when the exciting effect is the ground acceleration which is time dependent and of course not periodical. The response of the structure to the ground acceleration will be a vibration like motion. The structure gets forces of inertia which is calculated ac- cording to the Newton’s law (F = m a) and it is proportional to the mass and acceleration. These equivalent forces of course cause internal forces, stresses and if they are larger than the limit value the structure may collapse.
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13 +From the above explanation we found that originally this is a dynamic phenomenon when the acceleration and so the inertia forces change in each second. The interaction of the ground and structure is complicated so in a given time the acceleration of the structure depends on several components:
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15 +* ground acceleration (the seismic magnitude and its development on time),
16 +* the elasticity of the structure,
17 +* the mass and mass distribution of the structure,
18 +* the connection between the structure and ground, namely soil type.
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20 +Another complicated problem is to define exact direction of the ground motion in the seismic investigation. Generally the ground movement is assumed as an arbitrary horizontal motion but the vertical motion also may cause problem to the structure. Fundamentally the calculation process can be divided into three methods:
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9 9  == Time history ==
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