On the fibre modelling of beams in RC framed buildings with rigid diaphragm

The development of an accurate numerical model plays a key role for the proper assessment of structures. To this end, fibre modelling is widely considered as one of the most rigorous tool for an accurate evaluation of the seismic response of RC framed buildings. However, it has been noted that the i...

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Bibliographic Details
Published in:Bulletin of earthquake engineering 2020, Vol.18 (1), p.189-210
Main Authors: Barbagallo, Francesca, Bosco, Melina, Marino, Edoardo M., Rossi, Pier Paolo
Format: Article
Language:English
Subjects:
Aseismic buildings
Axial forces
Bending moments
Buffers
Civil Engineering
Collapse
Computer simulation
Concrete
Concrete slabs
Deformation
Dynamic analysis
Earth and Environmental Science
Earth Sciences
Environmental Engineering/Biotechnology
Forces (mechanics)
Frame structures
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Mathematical models
Mechanical properties
Modelling
Nonlinear analysis
Nonlinear dynamics
Numerical models
Original Research
Seismic response
Shear forces
Structural Geology
Structural members
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Summary:The development of an accurate numerical model plays a key role for the proper assessment of structures. To this end, fibre modelling is widely considered as one of the most rigorous tool for an accurate evaluation of the seismic response of RC framed buildings. However, it has been noted that the interaction between fibre modelled RC beams and the rigid diaphragm adopted to simulate the concrete slab, typical of RC buildings, may cause the development of unintended fictitious axial forces in beams. These axial forces may lead to an overestimation of the resisting bending moment of beams cross section, thus altering the distribution of yielding in the structural members and the collapse mechanism. The goal of this paper is to overcome this drawback by introducing at one end of each beam a simple additional element, named axial buffer element. This element allows the axial deformation of the beam, prevents the development of fictitious axial force and does not invalidate the transmission of shear force and bending moment. The paper investigates the influence of the presence/lack of the axial buffer element on the seismic response of a set of RC buildings representative of real structures. For this purpose, incremental nonlinear dynamic analysis and nonlinear static analysis were conducted.
ISSN:1570-761X
1573-1456
DOI:10.1007/s10518-019-00723-z