Modelagem numérica de vigas mistas aço-concreto

Abstract

A utilização de estruturas mistas está cada vez mais presente nas obras de Engenharia Civil. As vigas mistas, em particular, são estruturas compostas por dois materiais, um perfil metálico, situado em região predominantemente tracionada, e uma seção de concreto, situada em região predominantemente comprimida, ligados entre si através de dispositivos metálicos denominados de conectores de cisalhamento. As funções prin- cipais dos conectores são: permitir o trabalho solidário da laje-viga, restringir o escorregamento longitudinal e o deslocamento vertical na interface dos elementos e, absorver forças de cisalhamento. Nesse contexto, apresentam-se neste trabalho, modelos numéricos tridimensionais de vigas mistas aço-concreto, com a finalidade de simular o seu comportamento estrutural, enfatizando a interface laje-viga. As simulações foram feitas através do software ANSYS versão 10.0, que tem como base o Método de Elementos Finitos. Os resultados obtidos foram comparados com os previstos por norma e com referências encontradas na revisão bibliográfica, verificando-se que a modelagem numérica é uma ferramenta válida para a análise de vigas mistas aço-concreto.

Experimental analysis of the structural behavior of different types of shear connectors in steel-concrete composite beams

“…The interaction between the concrete elements and steel sections used in composite steel-concrete systems can be achieved by mechanical means (connectors, cavities, rebounds), by both friction and adhesion [4]. Although the natural adhesion between the two materials generates remarkably high friction forces, these are not usually considered when calculating the resistant capacity of some elements, such as composite beams [5].…”

“…The composite beams, in particular, are constituted by the association of a steel section located in a predominantly traction region with a concrete slab located in a prevalently compressed region. The mechanical connection among the materials is made by steel devices called shear connectors [4] whose main functions are: to allow the slab-beam elements to work together [3], to restrict longitudinal slipping and vertical displacement at the interface elements, in addition to absorbing shear forces [6].…”

Numerical simulation of steel-concrete composite beams: updated strategies of finite element modeling

“…Between the 1960s and the 1970s, several experimental studies were carried out [9]- [11]. More recently, studies using the finite element method for the numerical analysis of these beams have been multiplied, with the construction of models that contemplate the partial interaction [1], [8], [12]- [16].…”

“…Tamayo et al [13], Tamayo [14] and Dias [15] developed a computational code at CEMACOM/UFRGS for the analysis of composite beams, considering a three-dimensional finite element model in which the concrete slab was modeled by 8-node degenerated shell elements, the shear connectors by bar elements with penalties and the steel profile by shell elements. ANSYS software was employed by Kotinda [1] and by Marconcin et al [16], with the steel profile being modeled by shell elements (named SHELL43), the concrete slab by hexahedral elements (SOLID65), the shear connectors by bar elements (BEAM189), and using pairs of contact elements (TARGE170 and CONTA173) at the interface between steel and concrete. Queiroz et al [8] also used ANSYS and modeled the steel profile by shell elements (SHELL43), the concrete slab by hexahedral elements (SOLID65) and the connectors by non-linear spring elements (COMBIN39).…”

Numerical simulation of composite steel-concrete alveolar beams: web-post buckling, Vierendeel and flexural mechanisms

“…Therefore, advances in numerical simulation are essential for a better understanding of the structural behavior of composite alveolar beams and can be helpful for the validation and improvement of future standardizations. In the last decades, several researchers have developed finite element models for the analysis of composite beams (Gattesco, 1999;Queiroz et al, 2007;Marconcin et al, 2010;Tamayo et al, 2015;Dias et al, 2015;Liu et al, 2017;Katwal et al, 2018), alveolar steel beams (Ellobody, 2012;Durif et al, 2013;Erdal and Saka, 2013;Vieira, 2015;Wang et al, 2016;Oliveira et al, 2019;Shamass and Guarracino, 2020) and composite alveolar beams (Megharief, 1997;Müller et al, 2006;Gizejowski and Salah, 2008;Bake, 2010;Ferrari, 2013;Lawson et al, 2018). Since the approached numerical problem presents many nonlinearities, both physical (materials behavior) and geometric (profile buckling), different modeling strategies have been used, employing several commercial and authorial software products, with varying degrees of simplification.…”