shear force concept
Definition and concept of basal shear force:
Baseline
shear force is defined as an imaginary force applied to origin as a real force
for structural design purpose, and is equivalent to the inertia force that
originates in the origin due to earthquake (earth movement).
static
methods it is assumed that the origin is aggregated blocks at the levels of the
floors and that the effects of earthquakes are rewarded with an imaginary
horizontal inertia applied to the origin in a concentrated force at the levels
of the floors, and then distributed horizontally on each floor to the
structural elements resistant to horizontal forces according to their relative
hardness.
In
static equivalent methods, the dynamic response is taken into account, but
slightly more than the fact, because the earthquake's strength is taken at its
highest strength and with an escalation of safety, in order to ease the
solution. There are other methods that can be used for all facilities such as
methods of dynamic analysis, and although they are advanced methods and
accurate, but they must be calibrated (compared) methods equivalent static
The
structural designer gets the maximum inertial force possible for the structure
to withstand the seismic force is the opposite force in the direction, and for
this is distributed elements resistant to horizontal forces (shear walls and
tires) in such a way that the effective mass can contribute as much as possible
in response to horizontal forces, and so that Seismic force is dissipated
according to the amount of compliance of the structural sentence resistant to
lateral forces. The inertial force is the mass of the mass in the acceleration
of gravity: F = m * a
The
earthquake or seismic wave shall have six compounds in the space, four
compounds in the horizontal direction and two compounds in the vertical
direction. The horizontal force (Eh) shall be applied to the origin on four
sides where the origin of the earthquake cannot be predicted. In the case of
static analysis, all compounds are taken to all directions in their real value
according to the design earthquake corresponding to the seismic zone, and one
of the two vehicles (Eh or Ev) Be urgent Meh design and this depends on the
type of sentence construction and resistance response to the movement of the
earth, for example, a horizontal design facility as a bridge is different from
the design of a vertical facility such as building high.
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