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Previous issue date: 2017-03-03 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A alvenaria ? um material comp?sito, constitu?do basicamente por unidades e
juntas de argamassa (vertical e horizontal), podendo estar associada tamb?m a outros
materiais, como o a?o e o graute. No Brasil, a partir da d?cada de 80, a alvenaria
estrutural acabou se consolidando como um sistema construtivo altamente produtivo,
racional e econ?mico devido a caracter?sticas como: simplifica??o das t?cnicas de
execu??o, menor diversidade de materiais empregados, redu??o da m?o de obra e
rapidez na execu??o. Em alvenaria estrutural, uma das possibilidades de execu??o
que pode ser explorada ? o n?o preenchimento das juntas verticais, tamb?m chamada
de juntas secas. A ado??o desta pr?tica gera certas vantagens como a diminui??o no
tempo de execu??o da obra, a redu??o do consumo de materiais e a minimiza??o da
fissura??o provocada pelas deforma??es intr?nsecas, como retra??o e deforma??es
t?rmicas. No entanto, apesar de ser empregada a alguns anos no pa?s, as implica??es
decorrentes de seu uso muitas vezes n?o t?m sido consideradas de forma apropriada
nos projetos, isto se deve ao fato de existirem poucas pesquisas que tratam deste
assunto. Al?m disso, as pesquisas existentes, por vezes, apresentam resultados que
divergem entre si, principalmente no que se refere ? resist?ncia ? compress?o e ao
cisalhamento. Neste trabalho foram efetuadas simula??es num?ricas de pequenas
paredes de unidades cer?micas e de concreto, com e sem juntas verticais, ensaiadas
com as prescri??es da NBR 15812-2 (ABNT, 2010), NBR 15961-2 (ABNT, 2011) e NBR 14321 (ABNT, 1999), com a finalidade de avaliar a influ?ncia do n?o
preenchimento das juntas verticais na resist?ncia ? compress?o e ao cisalhamento da
alvenaria. Para a realiza??o das an?lises num?ricas foi utilizado o M?todo dos
Elementos Finitos a partir do software DIANA?. De acordo com os resultados
num?ricos obtidos nos modelos em compress?o, e da compara??o entre estes e os
resultados experimentais, foi poss?vel concluir que a aus?ncia das juntas verticais n?o
influenciou na resist?ncia ? compress?o da alvenaria. Contudo, a partir dos resultados
obtidos nos modelos em cisalhamento, conclui-se que n?o foi poss?vel avaliar
quantitativamente a influ?ncia das juntas verticais na resist?ncia ao cisalhamento da
alvenaria. / Masonry is a composite material, consisting basically of units and mortar joints (vertical
and horizontal), and may also be associated with other materials, such as steel and
grout. In Brazil, from the 1980s, structural masonry consolidated itself as a highly
productive, rational and economical construction system due to characteristics as:
simplification of execution techniques, less diversity of materials employed, reduction
of labor and speed execution. In structural masonry, one of the execution possibilities
that can be explored is the non-filling of vertical joints, also called dry joints. The
adoption of this practice generates certain advantages as the reduction in the
execution time of the construction, the reduction of the consumption of materials and
the minimization of the cracking caused by the intrinsic deformations, such as
retraction and thermal deformations. However, despite be employed to some years in
country, the implications of its use often has been not properly considered in the
projects, this is due to the fact that there is few research that deals with this subject.
Moreover, the existing researches sometimes present results that diverge from each
other, mainly with respect to the resistance to compression and shear. In this work,
numerical simulations of small walls of ceramic and concrete units, with and without
vertical joints, tested with the requirements of NBR 15812-2 (ABNT, 2010), NBR
15961-2 (ABNT, 2011) and NBR 14321 (ABNT, 1999). The purpose of this work was
to evaluate the influence of non-filling of vertical joints on the compressive strength and shear strength of the masonry. For the numerical analyzes, the Finite Element Method
was used from DIANA? software. According to the numerical results obtained in the
models in compression, and the comparison between these and the experimental
results, it was possible to conclude that the absence of the vertical joints did not
influence the compressive strength of the masonry. However, from the results obtained
in the shear models, it was concluded that it was not possible to quantitatively evaluate
the influence of the vertical joints on the shear strength of the masonry.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23593 |
| Date | 03 March 2017 |
| Creators | Ferreira, Anderson Albino |
| Contributors | 02147178446, http://lattes.cnpq.br/4343155598427033, Nascimento Neto, Joel Ara?jo do, 83991301415, http://lattes.cnpq.br/2747505817148030, Silva, Andrea Brasiliano, 95224661404, http://lattes.cnpq.br/7960530718632221, Di?genes, Hidelbrando Jos? Farkat, Maciel, Daniel Nelson |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA CIVIL, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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