Abstract
ABSTRACT In this paper, seismic analyses are performed of a reinforced concrete frame building with participating masonry walls are carried out. The spectral method of the Brazilian code – ABNT 15421:2006 – was used to obtain the lateral seismic loads. The equivalent diagonal-strut model was employed to simulate the axial stiffness of the masonry walls in the frames, according to different formulations founded in literature. The main purpose is to evaluate the differences implemented by the different formulations for the equivalent strut on the seismic response. This paper also aims at comparing results obtained when the masonry stiffness is not considered under seismic loads. The results obtained are analyzed with the purpose of providing contributions for structural engineers in the design of framed structure buildings with participating masonry walls subjected to seismic loads.
Highlights
The infill masonry walls in framed structures are always present in multi-story concrete buildings, especially for use in sealing functions
This paper presents numerical simulations of a multistory reinforced concrete frame building with participating masonry walls submitted to lateral seismic loads
As demonstrated in Doudoumis [24] and Asteris et al [60], the modeling via Finite Element Method (FEM) with finite elements for plane stress and material linear analysis can be useful in different situations, such as the verification of more simplified models, serving to measure the expressions proposed for determining the equivalent diagonal width
Summary
The infill masonry walls in framed structures are always present in multi-story concrete buildings, especially for use in sealing functions. It is possible that the future approval of the Brazilian code for updated and unified structural masonry will encourage the use of participating masonry in the country This could be introduced as another option for increasing stiffness and strength under lateral loads at Ultimate and Service Limit States checks of the entire structural system. New studies have been proposed changes to this map, noting that it does not correspond well to the actual situation, with an underestimation of seismic actions in some regions For these reasons, it is expected that the consideration of seismic actions in structural projects will be more frequent, as a consequence of the growth in research on the subject in Brazil, followed by the updating of seismic records in the country. This paper aims at comparing results in the case when the presence of masonry is overlooked concerning the structural behavior under seismic loads
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