SEISMIC VULNERABILITY AND FRAGILITY OF STEEL BUILDINGS
The main goal of this article is to evaluate the structural behavior of steel buildings. The seismic performance of a specific steel building located in the campus of the National University of Colombia in Manizales is assessed. The seismic demand is characterized by a peak effective acceleration of 0.25 g. Pushover analysis applied to a low-rise steel moment-resitant frame building and a low-rise steel braced frame building has shown the inadequate seismic behaviour of moment-resistant frame buildings, althoug the increase of the stiffness of braced frame buildings may induce seismic damage to non-structural elements sensitive to spectral acceleration.We have obtained fragility curves and damage probability matrices for the seismic demand anticipated by the Colombian seismic code for Manizales. We obtain specific relationships between yielding and ultimate capacity spectral displacements and damage states thresholds. These relationships can be applied to low-rise moment resistant frame and low-rise braced frame buildings. The comparison of the obtained expected mean damage states and the vulnerability classes provided by the EMS-98 macro-seismic scale leads us classifying low-rise steel braced frame buildings and low-rise steel moment resistant frame buildings respectively into the vulnerability classes C and D-E. We clearly show that, stiffening buildings with concentric braces leads to more earthquake-resistant structures, and therefore with a significantly lower seismic vulnerability.
vulnerability fragility moment resistant frame braced frame seismic damage.
C.A. Bermúdez A.H. Barbat L.G. Pujades J.R. González-Drigo
Dept. Of Civil Engineering , Universidad Nacional de Colombia, Manizales, Colombia Dept. Of Strength of Materials and Structural Engineering(RMEE)UPC Spain Dept of Geotechnical Engineering and Geo-Sciences ETCG UPC Spain Dept. Of Strength of Materials and Structural Engineering(RMEE) UPC Spain
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）