Resumen de New design considerations for seismic isolated buildings in colombia
An important percentage of Colombian population is located in medium-to-high seismicity zones (NSR-10, 2010). Therefore, it is important to protect the buildings, principally the highly crowded ones, and those that are considered as indispensables for community attention after an earthquake event. One most successful techniques for structural protection is base (seismic) isolation; despite their obvious advantages, in Latin America (and, more specifically, in Colombia), its use is still only limited, whit a low number of isolated buildings. This situation can be due to several reasons: insufficient awareness of this technology, poor knowledge of the involved professionals (i.e. engineers) in design and construction of isolated structures, and lack of local design codes; this last circumstance, forces employing foreign regulations (ASCE 7 in the Colombian case) that do not account for the local characteristics and frequently lead to relevant cost increases. The objective of this Thesis is to promote base isolation in Colombia and other close countries; with this aim, the following tasks are performed: (i) to study and compare the requirements of different major seismic isolation regulations (Japan, China, Russia, Italy, USA, Chile, México), (ii) inside each code, to contrast the results (in terms of forces and displacements) obtained from approximated analysis methods (lateral equivalent method) and more sophisticated procedures (time-history analysis), (iii) to propose (for Colombia) damping modification factors for design spectra, and (iv) to formulate new considerations for design of isolated structures in Colombia (to be converted into a national design code).
