View Single Post
Old Posted Aug 18, 2014, 2:49 PM
seismic's Avatar
seismic seismic is offline
Registered User
Join Date: Feb 2010
Posts: 107
A carrying skeleton of a building consisting of columns (vertical elements) and the beams and slabs (horizontal elements)
The beams, columns, and the plates are joined at the nodes.
When the skeleton of the structure is at rest, ( calm ) all the loads acting vertically.
When there is an earthquake, generated additional horizontal loads.
The resultant of the horizontal and vertical loads deforms all nodes of the structure.
This happens because they create moments, changing the degrees of nodes.
The vertical static loads are balanced by the reaction of the soil.
The horizontal earthquake loads, lifts the base of the columns and in combination with the flexibility that exists in the trunk , displacing the plates with different amplitude, and phase difference of one plate from the other.
That is, the top plates are shifting more of the lower plates.
The construction is changing many forms.
So many forms as there are the directions of the earthquake.
The ideal would be to construct a frame building which during the earthquake to displace all of the plates with the same amplitude, keeping the same form as before the earthquake.
In this way we would not have any deformation of the frame, so no failure.
The research I do on the seismic design of structures is precisely this.
This was achieved by constructing large elongated rigid columns shaped in plan, -, +, Γ, or T in which a force is applied to all edges on the roof, coming from the ground.
This force on the roof, on elongated rigid columns applied to stop the rotation, which lifts the base up.
When there is an earthquake, columns lose their eccentricity lifting the base, creating moments at all nodes of the structure.
In the calculations, there is a limit of eccentricity. That is, they put a limit on the area of the base, which is lifted from the overturning moment.
To reduce the lifting base, build strong base beams to columns.
In large longitudinal columns (walls) because of the large moments download, it is practically impossible to stop the torque.
The invention makes it.
Stops the great moments of the longitudinal walls.
Reply With Quote