Abstract
Designer engineers have always the serious challenge regarding the choice of the kind of structures to use in the areas with significant seismic activities. Development of fragility curve provides an opportunity for designers to select a structure that will have the least fragility. This paper presents an investigation into the seismic vulnerability of both steel and reinforced concrete (RC) moment frames using fragility curves obtained by HAZUS and statistical methodologies. Fragility curves are employed for several probability parameters. Fragility curves are used to assess several probability parameters. Furthermore, it examines whether the probability of the exceedence of the damage limit state is reduced as expected. Nonlinear dynamic analyses of five-, eight-, and twelve-story frames are carried out using Perform 3D. The definition of damage states is based on the descriptions provided by HAZUS, which gives the limit states and the associated interstory drift limits for structures. The fragility curves show that the HAZUS procedure reduces probability of damage, and this reduction is higher for RC frames. Generally, the RC frames have higher fragility compared to steel frames.
Highlights
Collapse fragility curves give information on how the probability of structural damage increases with increasing peak ground acceleration
This paper presents an investigation into the seismic vulnerability of both steel and reinforced concrete (RC) moment frames using fragility curves obtained by HAZUS and statistical methodologies
In the 5-story frames at the complete damage state, the fragility curves nearly overlap at low PGA and only diverge slightly at high PGA
Summary
Collapse fragility curves give information on how the probability of structural damage increases with increasing peak ground acceleration. Fragility curves were first designed for nuclear power plants in 1980 [2]. Following that, these curves were further developed by Kircher and Martin 1993 [3]; the curves are simple in terms of calculation, and they had been obtained experimentally and with engineering judgment. These curves were further developed by Kircher and Martin 1993 [3]; the curves are simple in terms of calculation, and they had been obtained experimentally and with engineering judgment They had considered the vertical and horizontal axes based on emergence probability and the qualitative amount of earth motion, respectively. Rossetto and Elnashai [9] used the empirical method by using data gathered on structures damaged during past earthquakes
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