This article is concerned with the development of seismic fragility curves for typical mid-rise plane reinforced concrete moment-resisting frames in Kingdom of Saudi Arabia (KSA), which is considered as low-seismicity area. Two structural models; four-and eight-storey moment-resisting frames were considered. Three cities with different seismic intensities, Abha, Jazan and Al-Sharaf, were selected to cover various values of mapped spectral accelerations in KSA. The 0.2-s spectral accelerations range from 0.21 to 0.66 g, while the 1.0-s spectral accelerations range from 0.061 to 0.23 g. The structural models were designed under dead, live and seismic loads of these cities according to the Saudi Building Code. Incremental dynamic analysis was performed under 12 ground motions using SeismoStruct. Five performance levels, namely, operational, immediate occupancy, damage control, life safety and collapse prevention were considered and monitored in the analysis. Fragility curves were developed for the structural models of the three cities considering the five selected performance levels.

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Presenting the composite deck, which consists of concrete slab with profiled steel sheets fixed to the top layer of Double Layer Grid (DLG), proved its great efficiency in increasing the load carrying capacity for this type of structures. Earlier studies concluded that the application of the prescribed composite action had solved many problems facing the spread of DLG structures such as their prone to collapse in a progressive manner besides their suitability to be used only as roof covering structures. In addition, the application of the composite action introduced an economical solution due to considerable savings in steel material used in building the top layer of the DLG structures. However, openings in the deck are needed for architectural purposes such as passing service ducts, day-lighting panels or passing shear walls or continuous structural elements. Adding such openings in the deck affects the efficiency of the composite deck in carrying the assigned loads especially if the openings are being added after the construction is completed. The current research introduced experimental tests along with numerical investigation using ABAQUS software for composite deck space trusses with common cases of support patterns and different deck opening locations. The study shows the obvious effect of the existence of openings and their locations on the load carrying capacity and ductility of DLG space structures. Ó 2016 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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