000019989 001__ 19989
000019989 005__ 20170118182349.0
000019989 04107 $$aeng
000019989 046__ $$k2017-01-09
000019989 100__ $$aHeresi, Pablo
000019989 24500 $$aQuantitative Evaluation of New Strategies To Increase Seismic Resilience of Cities: a Shift of Current Paradigms

000019989 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019989 260__ $$b
000019989 506__ $$arestricted
000019989 520__ $$2eng$$aLowrise wood-frame structures represent the most frequently used construction type for residences in many earthquakeprone regions such as the United States, Japan, Canada, New Zealand and many other countries. Although in general these structures have shown an acceptable seismic performance in terms of collapse safety, they have resulted in multi-million dollar losses that have large regional economic impact. Furthermore, even if collapse is avoided, damage may result in occupants being displaced from their residences, which for urban areas translates into the need to provide temporary housing to many thousands of people. Investigators at Stanford University have recently developed a new approach, referred to as “unibody design” which allows to significantly increase the lateral strength but particularly the lateral stiffness of lightweight residential construction, with very small increases in cost and changes in construction practice. Contrary to current approaches that allow significant nonlinear behavior and damage to take place, the unibody approach allows lowrise wood structures to essentially remain elastic and nearly damage free even in the event of large earthquakes. This paper proposes a probabilistic performance-based earthquake engineering framework for quantifying the benefits at a regional scale of using an enhanced design, in this case the unibody design, in residential construction. This study demonstrates that benefits of this novel approach are nonlinear, generating an exponential chain of regional risk reduction. Reasons for these large benefits are explained, as four effects can be superimposed: (1) increase the stiffness and strength significantly reduces the displacement demands in short-period structures, (2) reduced displacement demands result in a lower probability of damage, (3) enhanced houses closer to the seismic source present similar damage probabilities as conventional houses much farther away, and (4) the difference in distances to the seismic source are translated into significant differences in affected areas, and therefore, the number of damaged houses. The proposed framework is not exclusive of the unibody approach and can be used for evaluating the benefits of different types of retrofits or new designs which increase the strength and the stiffness of houses in an urban area. This framework provides useful information for decision-makers in seismic-prone regions to evaluate new public policies and the resilience of the residential construction.

000019989 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019989 653__ $$aregional risk estimation; residential construction; performance based earthquake engineering; resilience

000019989 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019989 720__ $$aHeresi, Pablo$$iMiranda, Eduardo
000019989 8560_ $$ffischerc@itam.cas.cz
000019989 8564_ $$s190810$$uhttps://invenio.itam.cas.cz/record/19989/files/4888.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4888.
000019989 962__ $$r16048
000019989 980__ $$aPAPER