COMBINED SYSTEMS FOR SEISMIC PROTECTION OF BUILDINGS

Since the contemporary technology entered into design of buildings the base isolation has become a new reliable procedure for retrofitting of old buildings and designing of new constructions. The elastomeric rubber bearing, the lead rubber bearing, the high dumping rubber bearing and the sliding system, are the widely used in recent years. Many projects use one type of base isolator, but others use more than one base isolator device (mixed system). This paper is intended to give an insight on the seismic performance of seismically isolated buildings using a combination of base isolation devices. The paper also intends to answer the questions: what is the performance expected from the use of more than one device? If the combination of different systems gives a good level of seismic performance, so which is the better combination to achieve the best performance? Narrow