Disclosed is an intelligent anti-seismic device for a shallow foundation ancient building, which may include a land, a foundation base and an ancient building body, foundation pit is excavated on a surface of the land, a plurality of piles are arranged on an inner wall of the foundation pit, a foundation side beam is integrally formed by pouring on tops of the plurality of piles, a first earthquake proof mechanism capable of being lifted and lowered is fixed on a top of the foundation side beam, a well-shaped base is integrally formed on the inner wall of the foundation pit, a second earthquake proof mechanism is fixed on a surface of the well-shaped base, a frame is fixed on both tops of the first earthquake proof mechanism and the second earthquake proof mechanism, a grillage beam is integrally formed on an inner wall of the frame.

A variable acceleration curved surface spiral gear transmission mechanism for accelerated oscillator damper damping systems is disclosed. Through the orthogonal orbit planetary gear set moving along the parallel circular arc line guide rail, the concave surface spiral gear and the convex surface spiral gear are meshed at different radii, so as to realize the continuous changing of the speed ratio and changing of the acceleration of the additional mass block. The spiral curve limit guide groove is set on the surface of concave surface spiral gear and convex surface spiral gear, and the changing rate of speed changing ratio is adjusted by designing different spiral curves, and then the acceleration changing rate of additional mass block is controlled.

A damper frame includes a structural frame and a damper assembly secured to the structural frame. The damper assembly includes a damper support secured to the structural frame. A damper is secured to the damper support. A diagonal link is secured to the structural frame. A lever is secured to the damper support and the damper. The lever is pivotally connected to the diagonal link so displacement of the diagonal link is amplified and transferred to the damper. The damper support includes a laterally-extending cantilevered portion and the damper is secured to the damper support at the cantilevered portion.

A base isolation supporting device 1 includes a support 8 which is adapted to be affixed to an outer casing 4 of a fixture 3 to be supported on a floor 2, so as to receive the load, acting in a vertical direction V, of the fixture 3, and which has a cross-sectionally circular arc-shaped convex outer surface 7; and a rotating body 13 which, at a cross-sectionally circular arc-shaped outer surface 9 thereof, is adapted to be brought into contact with the cross-sectionally circular arc-shaped convex outer surface 7 of the support 8 slidably and rotatably in an R direction about a center O1, while, at a cross-sectionally circular arc-shaped convex outer surface 11 thereof, coming into contact with a flat surface 10 of the floor 2 rollably about the center O1, so as to receive together with the support 8 the load, acting in the vertical direction V, of the fixture 3 via the support 8.

A three part foundation system for supporting a building is described. Three part foundation systems can include a containment vessel, which constrains a buffer medium to an area above the containment vessel, and a construction platform. A building can be built on the construction platform. In a particular embodiment, during operation, the construction platform and structures built on the construction platform can float on the buffer medium. In an earthquake, a construction platform floating on a buffer medium may experience greatly reduced shear forces. In a flood, a construction platform floating on a buffer medium can be configured to rise as water levels rise to limit flood damage.

Disclosed is a self-centering viscous damper with pre-pressed ring springs. The self-centering viscous damper with pre-pressed ring springs comprises a first inner cylinder, a second inner cylinder, a third inner cylinder, an outer cylinder, a first end cover, a second end cover, a piston, a piston rod, a ring spring, a first connector, a second connector, a first linking nut, a second linking nut, a first outer cover, a second outer cover, a first end and a second end. Due to the interaction between the inner and outer cylinders, the ring springs are further pressed whether a damper is tensioned or pressed. The ring springs have been applied with pre-pressure which overcomes a frictional force and a restoring force when the ring springs are in an initial equilibrium position.

An object, such as a building, provided with a system for preventing damage from earthquakes to the object, said system comprising: a foundation anchored to the ground; guide means mounted on said foundation and on said object arranged to allow relative displacement between the object and the foundation in at least one horizontal direction; at least one actuator arranged to displace said object in said at least one direction relative to said foundation; said at least one actuator being connected to a central processing unit;
said central processing unit being connected to at least one displacement sensor;
said at least one displacement sensor being arranged to detect in real time displacement of said foundation and/or the ground and/or said object and to input in real time data about said displacement to said central processing unit; and
said processing unit being programmed to activate in real time said actuator in dependence on said data in such a manner that said object is displaced relative to said foundation in real time, such that the maximum displacement vector of the object relative to the earth's gravitational field is kept substantially smaller than the maximum displacement vector of said foundation relative to the earth's gravitational field.

A seismic isolation assembly is defined by a first support plate and a second support plate disposed in parallel relation with a spacing being provided between the support plates. The first support plate is connected to ground and the second support plate is attached to a structure to be isolated. A set of wire rope isolators are disposed between the first and second support plates as well as at least one linear damper that is angularly disposed and mounted between the first and second support plates.

The present invention refers to a mass damper for reducing vibrations of a structure with a pendulum mass and a damping means, wherein the mass damper has at least three bearings with which the pendulum mass is movably supported on the structure such that it can execute pendulum movements and each of the bearings has at least one pendulum plate with a concave bearing surface and a sliding shoe arranged movably thereon with a convex counter surface. In accordance with the invention, the bearing surfaces and the associated counter surfaces are curved with a constant radius of curvature R and all bearings have a lowest possible friction between the counter surface and the bearing surface. The invention also extends to a structure with such a mass damper and a method for adjusting the natural frequency of a mass damper, in which the natural frequency of the pendulum mass can be adjusted independently of one another in both main directions by displacing and/or rotating the pendulum plates. The invention also extends to the damping means, which can be implemented with linear viscous passive damping, with square viscous passive damping or with controlled damping, in order to tune this damping together with the friction damping of the bearings to the optimum damping of the mass damper.

A sliding seismic isolator includes a first plate attached to a building support, and at least one elongate element extending from the first plate. The seismic isolator also includes a second plate. The first and second plates are capable of moving relative to one another along a horizontal plane. The seismic isolator also includes a lower support member attached to the second plate, with a biasing arrangement positioned within the lower support member. The elongate element(s) extend from the first plate at least partially into the lower support member, and movement of the elongate element(s) is influenced or controlled by the biasing arrangement. The seismic isolator also includes a damping structure with closed ends spaced apart from the first plate and the base of the seismic isolator. The damping structure is configured to contain a substance, such as a liquid, gas, silicone, and/or a combination thereof, and to expand longitudinally when it is compressed.