Earthquake resistance of buildings with suspended structures

Abstract

There are different approaches to providing earthquake resistance for buildings. One implies selection of efficient structural systems with high dynamic characteristics, the use of which can significantly reduce seismic loads on buildings. One of such solutions suggests the use of suspended buildings. Due to various structural solutions in the buildings, a significant increase in the natural period of oscillations and, therefore, decrease in seismic loads on buildings can be achieved. Structural solutions of these buildings were analysed and dynamic characteristics of solutions under review were examined. Design investigation was performed with involvement of software applications SCAD and SOFiSTiK based on a technique using finite elements. The most efficient structural solution for a suspended building was defined. It was demonstrated that a higher ductility may lead to a dangerous oscillation of a building, especially under low-frequency seismic impacts. To limit dangerous shifts, it is suggested to introduce special damper elements in the flooring level to improve reliable and safe behaviour of buildings with suspended structures during earthquakes.