Building structural foundation with three-dimensional shock insulation and vibration attenuation

Abstract

The invention provides a building structural foundation with three-dimensional shock insulation and vibration attenuation. The building structural foundation with three-dimensional shock insulation and vibration attenuation mainly comprises a steel structural small platform laid the roots in a foundation, a shock absorber mounting sliding table and an elastic damping shock absorber, wherein a polytetrafluoroethylene based coating is prepared on the steel structural small platform; a self-lubricating composite material containing oil is adopted in the shock absorber mounting sliding table to beused as a sliding friction pair; according to the elastic damping shock absorber, disc spring support is adopted on the lower surface of a main piston, a liquid damping medium below a floating pistonhas low internal pressure in a static state, and the shock absorber works stably for a long time and no oil leakage occurs; an upper mounting joint and a lower mounting joint of the shock absorber have a slight cardan joint adjusting function; when an earthquake happens, the steel structural small platform vibrates with small amplitude following the foundation under the influence of earthquake waves, the mounting sliding table, the shock absorber on the upper part of the mounting sliding table and a building slide relatively on the steel structural small platform, so that earthquake energy inthe horizontal direction is weakened and input to the building on the upper surface; and the shock absorber has damping and energy absorption functions in the vertical direction, and thus, three dimensions have shock insulation and vibration attenuation protection action.

Description

technical field [0001] The invention belongs to the technical field of building foundation shock isolation, energy dissipation and vibration reduction. technical background [0002] Base isolation refers to the isolation layer which is composed of rubber bearings, damping devices and other components and has an overall reset function set between the foundation, bottom or substructure and superstructure of buildings such as houses. The time-lag effect of deformation can prolong the natural vibration period of the entire structural system, reduce the horizontal seismic action input to the upper structure, and meet the expected seismic requirements; the design of energy dissipation and shock absorption refers to the installation of energy absorbers in the building structure, and through the energy absorbers The relative deformation and relative velocity provide additional damping to dissipate the seismic energy input into the structure and meet the expected shock absorption req...

AI Technical Summary

Problems solved by technology

[0004] The friction pendulum system (FPS) is actually a friction pendulum sliding mechanism that relies on gravity to reset. When the natural vibration period of the upper mechanism is short, the natural vibration period of the isolation structure can be extended to T=2π(R / g)1 / 2, Among them, R is the radius of the sliding spherical surface, and g is the acceleration of gravity. This kind of mechanism only acts as vibration isolation for the swing direction. In order to meet the vibration isolation requirements of the two dimensions of the X / Y plane, it needs to be designed as a double-layer structure, and the structure is relatively complicated. The cost is also high, and the current technical method is mainly used for tuning the mass damping system (TMD)

[0005] The laminated steel plate / rubber isolation bearing system is relatively mature and has been popularized and applied for many years. This technical method and application have also been included in China's mandatory standards: "Technical Specifications for Architectural Design (GB 50011-2010)", China Architecture The industrial industry recommended standard "Building shock-isolation rubber bearings (JG / T 118-2018), the schematic diagram of the vibration-isolation rubber bearings is attached to the instruction manual figure 1 , where 1 is the upper steel plate, 2 is the steel plate for the support, 3 is the connecting bolt, 4 is the laminated rubber plate, and 5 is the laminated steel plate between the rubber plates. Taking advantage of the high elasticity of rubber, the horizontal shear force The bottom can be elastically deformed and recovered. Compared with the upper and lower connections of the rigid structure, the seismic energy in the horizontal direction can be less transmitted to the upper building structure, and the relative effect of the horizontal earthquake resistance on buildings with a shorter natural vibration period The disadvantage is that there is generally no vibration damping effect on the vibration of the upper building structure caused by the vertical earthquake action, and there is no effective vibration damping protection for the upper structure. Another disadvantage is that there is a long-period horizontal vibration. The danger of resonance

[0006] The sliding isolation method with plane friction between the building and the lower foundation can theoretically limit and isolate the seismic action in the horizontal direction to the greatest extent. The plane friction pair has the advantages of large bearing capacity and low pressure, and can play a role in seismic isolation. The technical premise is that the interface between the sliding friction pairs is stable, the friction coefficient is stable, and the sliding friction force is stable. However, in practical applications, steel plates with friction pairs will stick together due to corrosion, resulting in sharp fluctuations in the friction coefficient. In addition, between different building foundations In fact, there are different subsidence levels and different levels, and the sliding planes will not actually remain in an ideal plane. When a real earthquake occurs, sliding friction is difficult to actually occur, and the seismic energy in the horizontal direction will still be The shearing action is transmitted to the upper building structure, so ordinary sliding friction isolation is limited in practical application

[0007] The method of building energy dissipation and vibration reduction is to direct the energy input from the earthquake into the building structure to specially set mechanisms and components for absorption and dissipation, so as to protect the safety of the main body of the building. Type friction damper, mild steel and alloy damper, lead damper, steel plate or steel pipe / rubber sandwich type viscoelastic damper, and speed-dependent piston type viscous oil damper, these dampers or use interface Friction force or the use of elastic-plastic deformation of materials or the use of high-pressure oil to force through the orifice to generate damping force, all have certain loading hysteresis characteristics, and are mainly used in high-rise structures as interstory damping supports to absorb horizontal seismic energy. It is not suitable for the seismic isolation base layer of the building; especially the piston type viscous oil damper, the piston oil damper with double piston rods is generally used, and the main piston has a small damping hole. With a high internal pressure of 20-80MPa, the energy-dissipating damper used as the structural foundation is a severe test for long-term work to ensure that the dynamic seal does not leak oil. The reliability of this structure for structural foundation isolation and vibration reduction is not enough convince

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