Loss Assessment of a Case-Study Steel Mrf Building With Partially-Restrained Connections


Abstract eng:
Performance expectations of modern societies are increasing worldwide and hence, the computation of time-based losses due to seismic events is gaining relevance. Recent and ongoing studies on the performance-based earthquake engineering framework have illustrated concepts and applications of the approach for a wide range of structural configurations and materials. However, little information is available about timed-based losses of steel moment-resisting frames (MRFs) with partial-strength beam-to-column connections. In particular, bolted partial-strength connections are envisaged to have advantages over full-strength connections in zones of low-to-moderate seismic intensity, because of the lower initial cost as well as easier dismantling (or, eventually, demolition) of the whole structure or parts of it. Unfortunately, there is relatively limited knowledge about the seismic response of partial-strength connections, especially in terms of probabilistic characterization of their performance. Consequently, as a first step, a collection of experimental data, from a previous study on partial-strength moment connections made of bolted end-plates, was statistically analysed to derive component fragility curves. As a second step, a case-study steel building with a lateral force resisting system comprising MRFs with partialstrength connections was designed assuming a site of medium seismic intensity in Italy (i.e., the city of Naples). Non-linear response-history analyses were subsequently carried out using a set of purposely selected ground motions. Finally, a timebased loss assessment was conducted, considering both structural and non-structural elements. The total expected annual losses obtained from the loss assessment were seen to be contributed by approximately 30% by structural (i.e., joint) damage, which is a significant contribution although the largest part is still due to non-structural components. The probability of structural collapse was also seen to be particularly small, thus leading to a correspondingly small contribution of replacement costs to the total costs. This is explained to be a consequence of the MRFs having lateral-force resistance largely exceeding the minimum requirements from seismic design actions, because gravity and wind loads dominated the design. Although the numerical results shown in this (simplified) study should not be seen as a precise or general quantification of losses in actual buildings, the study suggests that steel MRF systems with partial strength joints should be investigated further as a potentially cost-effective design option, especially in low-to-moderate seismic intensity zones.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4613.:
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