L. Di Sarno

Field evidence and numerical investigation of the \(\text{ M}_\mathrm{w}= 7.1\) October 23 Van, Tabanlı and the \(\text{ M}_\mathrm{W}> 5.7\) November earthquakes of 2011

On Sunday, October 23rd, 2011, the Van province, in the Eastern Turkey, was stricken by a magnitude \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}

VALIDATION OF NUMERICAL MODELS FOR RC COLUMNS SUBJECTED TO CYCLIC LOAD

\text{ M}_{\mathrm{w}} \!=\! 7.1

Performance of the healthcare facilities during the 2016–2017 Central Italy seismic sequence

\end{document} earthquake. The maximum horizontal peak ground acceleration, i.e. 0.182 g, was measured from the seismic station in Muradiye, at about 40 km from the epicenter. Several \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}

Experimental Seismic Assessment of the Effectiveness of Isolation Techniques for the Seismic Protection of Existing RC Bridges

\text{ M}_\mathrm{w} > 5.7

Traditional versus innovative composite base column connections

\end{document} strong motion aftershocks were recorded in November 2011. The exceptionally rich sequence of ground motions was due to the dense seismotectonic activity of the Eastern Turkey, where many active historical faults exist and newly generated can also be found because of the ongoing continental collision between the Arabian and the Eurasian Plates. The 2011 Van earthquake sequence caused 644 casualties, 1966 injuries with 252 rescues; the total economic losses are estimated at around 1 billion US dollars. The present paper deals with the seismological and structural damage assessment of two major seismic events and aftershock sequences in Van region; special emphasis is on the findings of the site investigations performed in the aftermath of the major seismic event. The performed investigation has shown that there is substantial field evidence demonstrating that the losses generated to the local social communities were caused by typical structural and non-structural deficiencies that have been surveyed in the past in several moderate-to-major earthquakes worldwide, especially in poor countries. Comprehensive numerical simulations were also carried out to assess the characteristics of the strong motion records and their effects on existing representative building type of structures in the earthquake-affected region. It was found that the local building stock is highly vulnerable and requires urgent major structural interventions for seismic strengthening. A cost-efficient retrofitting scheme is however not straightforward. It should be a trade-off between two competing aspects: the use of innovative materials and technologies on one hand, and the low-quality of the workmanships and lack of adequate quality control during construction phase, which are available in the Van province, on the other hand.

Bracing systems for seismic retrofitting of steel frames

Abstract The use of stainless steel for civil engineering structural applications provides possibilities for a more efficient balance between whole-life costs and in-service performance. To achieve a safe and economic design it is necessary to investigate the mechanical response of structural components, connections and the overall system, thus leading to suitable design provisions. This paper assesses the feasibility of the application of stainless steel in the seismic design of regular and irregular framed structures. Towards this aim, static and dynamic analyses have been carried out on a set of 50 moment resisting frames designed in accordance with the European codes of practice (EC3 and EC8). The seismic performance has been assessed in terms of global parameters, i.e. resistance (base shears, system overstrengths), deformation (interstorey drifts and translation ductilities) and energy absorption and redistribution capacity (behaviour factors). The performed analyses show that stainless steel is a viable alternative to carbon steel, provided that proper design choices are employed for the structural configuration and material distribution within the members of the adopted systems. The optimal amount of such metal alloy to enhance the energy absorption capacity is also established on the basis of numerical analyses.