Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1994-08-23
1997-09-23
Friedman, Carl D.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
521676, 521678, E02D 3108
Patent
active
056691890
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an antiseismic connector of limited vibration for the safe seismic isolation of structures.
The description of the antiseismic connector of limited vibration, will be done as an indicating example for the case that the isolated structure is a building, and not to create limitations.
A building generally comprises a superstructure, which is above ground, and a foundation, which is embedded in the ground. A horizontal gap (joint) extends between the superstructure and the foundation and separates these two parts of the structure. The antiseismic connector of the present invention is disposed in the horizontal gap at the bottom of every column or wall of the superstructure, thereby creating vibration isolation of the superstructure. The connector connects the superstructure to the foundation so that both compressive and tensile vertical loads of the superstructure are translated to the foundation and reduces the seismic force input into the superstructure.
The connector connects the superstructure to the foundation using prestressed tendons or cables or rods (the terms 'tendon', 'cable', and 'rod' are used to describe either an individual wire, strand or bar or a group of wires, strands, or bars). In a preferred arrangement the prestressed tendons or cables will be vertically arranged or nearly so. The prestressed armament cables permit the relative movement of the foundation to the superstructure. The space needed for the unrestricted movement of the cables is provided by locating the cables in casings. The space between the cables and the casings will be preferably free (unbonded tensioned cables), but it can also be filled with a soft material which permits the relative movement between the endpoints of the cables. The prestressed cables create horizontal recentering forces which act to return the superstructure and foundation to their pre-earthquake spatial relationship.
After an in depth investigation and study of the problem, we came to the conclusion that whichever means of isolating a structure, from earthquakes or other ground excitations are used, the isolation system should be able to: superstructure, both static and dynamic, to the foundation. with safety, regardless of the height of the superstructure, and receive both compressive and tensile vertical loads (.+-.P). from sidewise sliding as well as recenter it to its initial position. its functioning condition after a certain time has elapsed. where it is installed. every plate at the base of the pillars of the superstructure. (concrete frame ) in order to have an easy application.
These are the efficient and sought-after conditions that safe means of supporting the superstructure to its foundation should fulfill in seismically isolated constructions. No previously known ways of isolating the superstructure from its foundation, for example by the use of rubber bearings, fulfill all these efficient and sought-after conditions.
We designed and studied a special mechanism for seismic isolation of structures taking into consideration all the necessary conditions that have to be satisfied. The antiseismic connector of limited vibration for seismic isolation of a structure of this invention superbly fulfills all the 10 conditions.
It has the following capabilities: superstructure and transfers them to the foundation. the superstructure. from sidewise sliding arising from the ground excitation because of the prestressed cables. them to return to their pre-earthquake spatial relationship.
The antiseismic connector can be made of the following parts: or spherical bearings with an elastic or other base, or roller bearings with an elastic or other base, or sliding interfaces, or of any other material. upper and lower plate at corresponding holes in the plates; and corresponding pairs of casings such as cones or cylinders and holes.
The connector is situated at the base of the pillar between the superstructure and the foundation. Of course, the connector could be disposed along the bottom of the wall of the superstructure or
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Logiadis Emmanuel
Logiadis George
Logiadis Ioannis
Friedman Carl D.
Horton-Richardson Yvonne
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