What is the engineering structural damping control, what is the principle of foundation seismic isolation?

Foundation seismic isolation technology is used between the building superstructure and the foundation of this flexible connection, set up enough safe seismic isolation system, due to the seismic isolation layer of the "isolation", "shock absorption" effect, the upper structure of the earthquake for the approximate leveling, the structural response of the rapid is only equivalent to the non-seismic situation of the 1/4-1/8 (strong seismic observation results can be up to 1/2-1/16), and thus "isolation" of the earthquake, in layman's terms: The houses using seismic isolation technology experience an earthquake of magnitude 8, which is equivalent to only magnitude 5.5. Not only does it achieve the purpose of reducing the damage caused by earthquakes to the superstructure, but also the building decoration and indoor equipment are effectively protected.

Engineering structural damping control is the use of external damping devices to effectively control the building structure. The principle of foundation seismic isolation is to add a seismic isolation layer to the building foundation to form a flexible base layer, which will consume and dampen the force of seismic waves, thus protecting the overall structural safety of the building. Now more and more buildings are adding building seismic isolation devices to make up for the lack of seismic capacity of the building itself.

At present, several commonly used vibration isolation devices are plate rubber bearing, PTFE bearing, lead core rubber bearing, hyperbolic spherical vibration isolation bearing and friction pendulum bearing. The vibration isolation device must be flexible enough to extend the cycle and reduce the seismic response, but under operating loads, it is necessary to ensure that the structure does not undergo large deformation and harmful vibration. These objectives can be achieved by selecting elastic bearing materials with certain characteristics.