000019973 001__ 19973
000019973 005__ 20170118182349.0
000019973 04107 $$aeng
000019973 046__ $$k2017-01-09
000019973 100__ $$aHutt, Carlos Molina
000019973 24500 $$aA Comparative Study on the Seismic Vulnerability of 1970s vs Modern Tall Steel Moment-Resisting Frame Buildings

000019973 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019973 260__ $$b
000019973 506__ $$arestricted
000019973 520__ $$2eng$$aThis paper outlines the methodology followed in the risk-based assessment of two archetype tall buildings in downtown San Francisco: a 50 story steel moment resisting frame (MRF) office building designed following the requirements of the Uniform Building Code of 1973 and a 50 story steel MRF office building designed following modern code requirements (International Building Code 2012). The methodology enables the development of the vulnerability function for the archetype buildings under consideration, highlighting loss contribution from (1) collapse, (2) irreparable damage from excessive residual deformations and (3) reparable damage. The goal of this study is to benchmark the performance of older existing steel MRF buildings against modern designs, providing an overall comparison of their seismic vulnerabilities. The results illustrate that existing tall steel MRF buildings from the 1970s are drastically more vulnerable to earthquakes than tall steel MRF buildings designed to modern standards. The vulnerability function for the 1970s archetype building highlights that collapse potential is the highest contributor to the losses, with a collapse fragility characterized by a relatively low median spectral acceleration. The resulting vulnerability function of the modern archetype building indicates that: i) at low ground motion intensities of shaking, losses are influenced by repairable damage; ii) at medium intensities of shaking losses are equally dominated by repairable damage and residual drift rendering the building irreparable; iii) collapse only starts contributing to the loss at large spectral amplitudes, but even then losses are largely dominated by residual drifts. The collapse fragility of the modern archetype building is in agreement with the design objective of modern building codes, which is to produce designs with low probability of collapse under a Maximum Considered Earthquake.

000019973 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019973 653__ $$aVulnerability Functions; Tall Buildings; Moment-Resisting Frames; Steel.

000019973 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019973 720__ $$aHutt, Carlos Molina
000019973 8560_ $$ffischerc@itam.cas.cz
000019973 8564_ $$s645809$$uhttps://invenio.itam.cas.cz/record/19973/files/4853.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4853.
000019973 962__ $$r16048
000019973 980__ $$aPAPER