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

Abstract

The present research is aimed at evaluating the influence of different modelling assumptions, such as crane-load and beam-column connections, on the local seismic response of precast RC buildings. The considered case study is a one-story industrial building designed in accordance with the Italian building code NTC 2008. Typical pinned beam-column connections are investigated. They are made by dowels protruding from the column inserted into holes in the beams, which are subsequently grouted. This technique ensures stability during the construction process and allows the horizontal seismic load transfer from the beam to the column. Different structural layouts have been modeled considering various types of beamcolumn joint models, namely a perfect hinge, an elastic hinge and a non-linear spring with a degrading hysteretic force-displacement model; the last model reproduces the results of recent experimental campaigns. Non-linear dynamic time history analyses allow to evaluate displacements, drifts, deformations and ultimate curvatures. The results are analyzed in terms of both global quantities, i.e. roof maximum displacements and rotation at the base of the columns, and local quantities, i.e. force or displacement demand at the beam-column connections, for the various implemented models. Depending on the considered model, it is observed that the effects of higher vibrating modes may increase the load in the connections.

Seismic Risk and Finite Element Modelling Influence of an Existing One-Storey Precast Industrial Building

“…The seismic design and assessment of such buildings may be carried out following both traditional and displacement-based approaches (Biondini and Toniolo, 2009;Biondini et al, 2010;Colombo et al, 2016;Belleri, 2017;Torquati et al, 2018;Belleri and Labò, 2021;Bosio et al, 2020;Sousa et al, 2020). Considering the modelling strategies in the case of new buildings, specific considerations on this structural typology can be found in Magliulo et al (2018Magliulo et al ( , 2021, Gajera et al (2021), Bressanelli et al (2019Bressanelli et al ( , 2021, Rodrigues et al (2021), Zoubek et al 2014, De Stefani andScotta (2022). During past earthquakes, the main seismic vulnerabilities observed were related to the loss of support of beam and roof elements, to the failure of RC forks at the top of the columns, to the failure of dowel connections, to the overturning of RC cladding panels among others (Belleri et al, 2015;Bournas et al, 2014;Minghini et al, 2016;Nastri et al, 2017;Palanci et al, 2017;Savoia et al, 2012;Belleri et al, 2017;Scotta et al, 2015;Toniolo and Colombo 2012;Menichini et al, 2020).…”

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

“…In general, one or two dowels are embedded in the upper part of the column and inserted in pass-through holes, filled with mortar, within the beam. The adopted connections play a crucial role in the seismic response of precast buildings (Bressanelli et al, 2019;: beam-to-column connections, in particular, influence the global response of the structure, altering substantially its behavior in terms of deformability and ductility.…”

“…Starting from the work of Bressanelli et al (2019) and Magliulo et al (2018), this research moves further by: investigating two different hysteretic models for the beam-to-column connections, such as the hysteretic uniaxial material model (Sousa et al, 2020) and the Modified Ibarra-Medina-Krawinkler Deterioration model (Lignos and Krawinkler, 2011); explicitly modelling the cladding panels in a pendulum configuration; removing the hypothesis of rigid diaphragm by introducing the roof elements and three types of beam-to-roof connections, namely hot-rolled, cold-formed and welded; explicitly modelling the overhead crane and the oscillating payload. The building collapse rates obtained from the comprehensive 3D model allowed to validate the collapse rates obtained from previous simplified analyses.…”

Modeling of the Beam-To-Column Dowel Connection for a Single-Story RC Precast Building

“…In the last decades, several research studies have been performed to investigate the vulnerability of modern (new) structures with mechanical connections under seismic actions (Vintzeleou and Tassios, 1987;Safecast, 2012;Zoubek et al, 2013;Magliulo et al, 2014a;Kremmyda et al, 2014;Brunesi et al, 2015;Zoubek et al, 2015;Dal Lago et al, 2018;Bressanelli et al, 2019;Cimmino et al, 2020;Sousa et al, 2020). Vintzeleou and Tassios (1987) conducted an experimental investigation in order to detect the main failure mechanisms of dry connections provided with dowels under cyclic loads.…”

“…The observed poor seismic performance has led the authors to discourage the use of this structural type of building in high seismic areas. Bressanelli et al (2019) performed a wide investigation on the modeling assumption reliability in reproducing the real seismic response of RC precast buildings. The assessed issues mainly concern the mass distribution, the influence of the higher vibrational modes, and the dowel connection implementation.…”