artigos

JOURNALS

Resumo 

This paper presents the results of an experimental program developed to investigate the behavior of an innovative technology for connections by adhesion, interlocking and friction in composite structures. Connections have a strategic importance for precast concrete and steel–concrete composite structures, since they determine the global structural behavior and affect the whole production process, from execution to assemblage and other services on site. Currently, however, steel–concrete composite connections are not completely adapted for their use in prefabricated slabs. In this way, the development of new types of connections is clearly necessary, where connections by adherence (or connections by adhesion, interlocking and friction) seem quite promising. To improve the knowledge in the field of connections by adherence, this paper proposes a new geometry of embossments in the steel and in the concrete surfaces associated with the use of a high performance mortar. Monotonic push-out tests are performed, and their results are presented and discussed. A satisfactory behavior of the proposed connection in terms of strength is observed, justifying further studies on the subject. 

Experimental analysis of new interfaces for connections by adhesion, interlocking and friction

Diógenes, Hidelbrando; El Debs, Ana Lúcia; Valente,Isabel

2015

Resumo 

Composite elements gained visibility when compared to conventional reinforced concrete elements, generating better constructive solutions. However, when analyzing studies on composite beams of steel and concrete, it is noted that the use of cold formed steel (CFS) is a topic that needs further discussion. Thus, the objective of this research was to analyze, employing a systematic review, which types of shear connection have the best performance in transferring efforts in composite beams with CFS. With that, variables such as load and vertical displacement behavior, the rupture modes and the levels of interaction were discussed. Thus, it is concluded that the continuous connectors are the most suitable for use in composite beams with PFF, as they present complete interaction and better crack control.

Análise do comportamento das conexões de cisalhamento em vigas mistas de aço e concreto constituídas por aço formado a frio

Ferreira, Josyverton; Diógenes, Hidelbrando; Costa, Mateus; Monteiro, Renan;

2022

Resumo 

Composite elements gained visibility when compared to conventional reinforced concrete elements, generating better constructive solutions. However, when analyzing studies on composite beams of steel and concrete, it is noted that the use of cold formed steel (CFS) is a topic that needs further discussion. Thus, the objective of this research was to analyze, employing a systematic review, which types of shear connection have the best performance in transferring efforts in composite beams with CFS. With that, variables such as load and vertical displacement behavior, the rupture modes and the levels of interaction were discussed. Thus, it is concluded that the continuous connectors are the most suitable for use in composite beams with PFF, as they present complete interaction and better crack control.

Numerical Simulation Of Pull Out Tests In Steel Checkered Plates

Almeida, Orlando; Almeida, Orlando; Costa, Lays; Nunes, Kildenberg; Diógenes, Hidelbrando; Araújo, Marília

2020

CONGRESS

Resumo 

In views of rationalization in the civil construction, the knowledge about the properties of materials, such as steel and wood, it's necessary to compare their properties, in financial and structural terms with concrete. Thus, the objective of this study was to compare the structural and financial conditions obtained for beams, from the development of software in the Visual Basic programming language. The study was carried out from the adoption of fixed calculation parameters for the materials, with variation only in the span length of the beam to analyze each material performance. It was found that for the small spans, up to 5 meters, there were no significant variations in the values found for the materials. Above this interval, the advantage of using concrete beams was found, when only the cost of the reinforced concrete was considered. When the possibility of reducing the height and weight of the building elements was considered, the steel beams proved to be more advantageous. The analysis considered isolated parameters, and additional studies regarding the buildings' execution time, expenses with the materials' maintenance, and resistant properties are necessary to achieve the best parameter and adoption of the construction system that fits the requirements of each construction. 

Computational Code for guide the decision on the type of structure: Steel, Wood or Concrete

Diógenes, Hidelbrando; Brasiliano, Andrea; Costa, Lays

2021