Estudo preliminar à análise do colapso progressivo em edifícios de alvenaria estrutural sobre estrutura de transição em concreto armado
One of the characteristics of structural masonry buildings is the difficult to make changes in the arrangement of apartment walls. If openings are made in structural walls, as a result of an inappropriate apartment layout modification, excessive displacements, large size cracking, local damage, e...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25998 |
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| Resumo: | One of the characteristics of structural masonry buildings is the difficult to make
changes in the arrangement of apartment walls. If openings are made in structural
walls, as a result of an inappropriate apartment layout modification, excessive
displacements, large size cracking, local damage, even progressive collapse may
occurs. However, there are few studies concerned with these situations, especially in
the case of structural masonry buildings above concrete floors structures, emphasizing
the importance of more accurate studies. The research presented herein aimed to
evaluate the stresses redistribution on walls and the implications in others structural
members, such as lintels and bond beams, as well as to evaluate the influence of
concrete floor structure in this redistribution, suggesting a series of verifications to the
study of progressive collapse in masonry buildings. For this purpose, two masonry
buildings with different walls arrangement in plan were modeled using the equivalent
frame model proposed by Nascimento Neto et. al. (2014). The analyzes were
conducted to evaluate, at the nearest floors to the opening created by the removal of
a structural wall portion, the normal and shear stresses at the walls base and at
predetermined vertical cross sections; and normal forces in the bond beams. The
results showed: the occurrence of intense stresses peaks in the floors immediately
above and under the floor in which occurred the removal, which dissipates
considerably two/three floors distant of the removal; the existence of masonry lintels,
bond beams and walls interconnections are very important to ensure the occurrence
of internal mechanisms to the stresses redistribution. |
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