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Influence of column shear failure on pushover based assessment of masonry infilled reinforced concrete framed structures: A case study

Lookup NU author(s): Dr Vasilis Sarhosis

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

Structural frames, constructed either of steel or reinforced concrete (RC), are often infilled with masonry panels.However, during the analysis of the structural frames, it has become common practice to disregard the existenceof infills because of the complexity in modeling. This omission should not be allowed because the twocontributions (of infills and of frames) complement each other in providing a so different structural system. Theuse of different modeling assumptions significantly affects the capacity as well as the inelastic demand and safetyassessment. In specific, the adoption of equivalent diagonal pin-jointed struts leaves open the problem of theevaluation of the additional shear on columns and consequently of the choice of a proper eccentricity for thediagonal struts. In this context, this paper presents the results of a real case study. The seismic performance of theRC structure of a school is evaluated by using concentric equivalent struts for modeling infills and the level of theadditional shear on the columns is fixed as a rate of the axial force on them in agreement to a strong correlationobtained after a numerical experimentation. Hence, the applicability of the correlation mentioned before isshown and the form in which the results can be provided is presented. The characteristics of the new approach,first time applied to a real case, are highlighted by a comparison between the performance obtainable withdifferent modeling detail levels of the infills. Through the paper, it is proved that the simplified evaluation of theadditional shear demand produced by infills just for the base columns is sufficient to warn that a simplifiedmodel disregarding infills or based on the use of concentric struts for the infills may considerably overestimatethe structural capacity. Further, by the study of a real case, the paper provides an overview of the modelsdeveloped by the authors to obtain the capacity of reinforced concrete framed structure for the practicalapplications.


Publication metadata

Author(s): Cavaleri L, Trapani FD, Asteris PG, Sarhosis V

Publication type: Article

Publication status: Published

Journal: Soil Dynamics and Earthquake Engineering

Year: 2017

Volume: 100

Pages: 98-112

Print publication date: 01/09/2017

Online publication date: 08/06/2017

Acceptance date: 28/05/2017

ISSN (print): 0267-7261

ISSN (electronic): 1879-341X

Publisher: Elsevier

URL: http://doi.org/10.1016/j.soildyn.2017.05.032

DOI: 10.1016/j.soildyn.2017.05.032


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