Rintc-E Project: Towards the Seismic Risk of Low and Pre-Code Single-Story Rc Precast Buildings in Italy

Abstract

This paper reports the preliminary results of a research project (RINTC-E) aimed at computing the risk of collapse in RC precast industrial buildings designed according to the codes in force in Italy in Seventies and Nineties. Companion papers describe the overall research project, funded by the Italian Civil Protection Department, its different areas of application (reinforced concrete, masonry, steel buildings, etc), and the overall seismic risk calculation procedure. This paper describes the design, modelling and pushover nonlinear analyses of one-story precast RC building, designed according to codes in force in Italy in Seventies. The structural nonlinear behavior is modeled using a lumped plasticity approach and the beam-to-column connection is based on friction forces. Collapse of the building is evaluated considering two failure conditions: i) 50% degradation of the maximum base shear recorded on the pushover curve; ii) beam-to-column connection failure. 2796 COMPDYN 2019 7 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

Seismic Retrofit of Existing Precast Rc Buildings With Dissipative Devices Based on Carbon Wrapped Steel Tubes

“…In particular, q decreases from 2.88, to 2.49 with a collapse limit 80% of , and to 1.84 with a collapse limit 60% of . These results clearly depend on the ultimate rotation limits predicted by Equation (2), which are not specific for existing precast columns, therefore, additional research is necessary in order to find more suitable formulations to be applied to this structural typologies, as recognized also by Magliulo et al [45].…”

“…Since the columns are prefabricated, with continuous longitudinal bars, it is not possible to consider the third correcting coefficient. All this enhances the necessity to evaluate other types of significant reduction coefficients to be proposed in this formula for the specific case of existing prefabricated elements not designed with anti-seismic standards, for which additional research may be required [44,45].…”

Influence of Modelling Assumptions on the Seismic Risk of Industrial Precast Concrete Structures

“…For further structural verifications, not available or not fully addressed in the Italian building code, Eurocode 2 (CEN, 2004), Eurocode 3 (CEN, 2004), CNR 10018/99 and CNR 10025/98 provisions were considered, particularly in respect to dowel capacity. Other details regarding the geometry of the selected case study may be found in Magliulo et al (2019).…”

“…At this regard, a case study resembling a typical precast industrial building was selected and a multiple-stripe analysis was carried out. The current research is part of an Italian national project, namely RINTC (Bracchi et al, 2019;Cantisani and Della Corte, 2019;Iervolino et al, 2019;Magliulo et al, 2019;Ragni et al, 2019;Ricci et al, 2019), aiming at assessing the failure rate of various construction typologies designed in accordance with modern anti-seismic regulations (specifically the Italian building code, NTC18, 2018), therefore estimating the implicit risk of codeconforming buildings. Specifically, the comparison of the collapse rates of the investigated comprehensive 3D model with models accounting for simplified assumptions (such as those used in the RINTC project) allows validating the simplifying assumptions, such as in the case of the dowel beam-to-column connections, in order to obtain good estimates of the structural failure rate while reducing the computational effort.…”

Effects of Modelling Assumption on the Evaluation of the Local Seismic Response for Rc Precast Industrial Buildings

“…Several studies have analyzed the performance of existing precast structures and how to make them earthquake proof [14], [15], [16], [17], [18], [19], [20], [21]. The research presented herein is aimed at evaluating the failure probability of new precast structures designed according to the current Italian seismic regulations as part of a national project financed by the Italian Civil Protection focused on the assessment of new and existing buildings [22], [23], [24], [25], [26], [27]. The influence of different modelling strategies on the failure rate are analyzed taking as reference a typical precast building.…”