The Predictive Model for Stiffness of Inclined Screws as Shear Connection in Timber-Concrete Composite Floor

Moshiri, Farzad; Shrestha, Rijun; Crews, Keith

doi:10.1007/978-94-007-7811-5_40

Cited by 9 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This free length is estimated as follows. In the same way as the models developed for connections with fully threaded self-tapping screws [24], the threaded rod is considered as a semi-infinite beam on elastic foundation loaded by a bending moment M 0 , see Figure 17. …”

Section: Ultimate Withdrawal Strength Of Threaded Rodsmentioning

confidence: 99%

Moment resisting splice of timber beams using long threaded rods and grout-filled couplers – Experimental results and predictive models

Cepelka

Malo

2017

Construction and Building Materials

View full text Add to dashboard Cite

In order to achieve larger spans of timber arch bridges, glulam massive timber sections must be spliced on-site by moment resisting and rotationally stiff joints. In this paper, a novel timber splice connection utilizing long threaded rods and grout-filled couplers is presented. Flexural characteristics of the splice joint were investigated by full-scale experimental tests and 3D finite element models. An analytical model is proposed for determining the moment capacity and the rotational stiffness of the splice connection. The experimentally measured efficiency of the splice connection with regard to moment capacity and rotational stiffness was 69 % and 66 %, respectively.

show abstract

Section: Ultimate Withdrawal Strength Of Threaded Rodsmentioning

confidence: 99%

Moment resisting splice of timber beams using long threaded rods and grout-filled couplers – Experimental results and predictive models

Cepelka

Malo

2017

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…To the authors' knowledge, there are no studies dealing with the lateral stiffness of long threaded rods. Eurocode 5 (CEN 2004) provides only a general relation for determining the total slip of a steel-to-timber joint with dowels, bolts, screws or nails, as It is here proposed to estimate the lateral stiffness of long threaded rods by considering the rod as a semi-infinite beam supported on an elastic foundation, similar to studies dealing with the application of self-tapping screws as shear connectors in timber-to-concrete joints (Symons et al 2010;Moshiri et al 2014). The main advantage of the proposed method is a straightforward analytical determination of the lateral stiffness for different boundary conditions imposed at the end of the rod.…”

Section: Lateral Stiffnessmentioning

confidence: 99%

Effect of rod-to-grain angle on capacity and stiffness of axially and laterally loaded long threaded rods in timber joints

2018

View full text Add to dashboard Cite

Long threaded rods have recently been widely used as a reinforcement of glued laminated timber in perpendicular to the grain direction. The recent research has thus focused mainly on the withdrawal properties of the threaded rods in the axial direction. Utilizing their large withdrawal stiffness and strength, the threaded rods can also effectively be used as connectors in moment resisting timber joints. Yet, in joints, the threaded rods are often imposed to a non-axial loading, due to inclination of the rod axis to the grain as well as loading direction different from the rod axis. No design models are currently available for the combined axial and lateral loading of the threaded rods. In the present work, the effects of the rod-to-grain and load-to-rod angles on capacity and stiffness of the threaded rods are investigated by use of experiments and finite element models. Based on those, analytical expressions for determining stiffness and capacity of axially and laterally loaded threaded rods are proposed, intended as a basis for practical joint design. Furthermore, effect of various boundary conditions applied at the rod-ends is studied.

show abstract

“…Sabe-se que dentre todos os tipos de ligações existentes, o tipo parafuso/cavilha é o mais utilizado na prática devido às suas vantagens. Estas são: seu baixo valor de aquisição, grande disponibilidade, fácil execução e grande ductilidade apresentada (Berardinucci et al, 2017;Chen et al, 2022;Di Nino et al, 2020;Dias & Jorge, 2011;Du et al, 2019;He et al, 2016;Jiang et al, 2017;Khorsandnia et al, 2012;Kozarić et al, 2018;Mai et al, 2018;Mascia & Soriano, 2004;Moshiri et al, 2014;Schanack et al, 2015).…”

Section: Introductionunclassified

Viabilidade da previsão do comportamento de estruturas compósitas madeira-concreto ligadas por parafusos via análise numérica 3D

Rodrigues,

Santos,

Fraga

et al. 2024

Cad. Pedagógico

View full text Add to dashboard Cite

Estruturas mistas madeira-concreto (MMC) ligadas por parafusos se destacam pelo seu comportamento dúctil. Porém, não foram encontrados modelos numéricos 3D de previsão do comportamento mecânico desse compósito. Assim, essa pesquisa explorou maneiras viáveis para a simulação de vigas MMC. As variáveis investigadas foram a consideração da inclinação (45° e 90°) e confinamento (Embedded region) do parafuso, valor do coeficiente de atrito estático (CAE) da interface concreto-madeira (sete valores) [modelos MR1C1], consideração de sete CAEs diferentes considerados em uma única análise (MR1C7), transição entre coeficiente de atrito estático e cinético (dezesseis modelos) [Modelos MR1D], parafusos simulados com elementos de treliça (MR1 e MR3) e elementos sólidos (MR2 e MR4), e madeira simulada como material isotrópico e ortotrópico (modelos MR3I e MR3O). Ao total vinte e nove simulações numéricas não lineares (física e geométrica) foram realizadas por meio do software Abaqus (2014). Assim, os resultados foram apresentados por meio da curva força x deflexão (fxd) e força x deslizamento (fxdes), além dos valores de rigidez inicial (Ki), rigidez de serviço (Kser), rigidez última (Ku) e de rigidez no colapso (Kc), além do tempo das simulações e distorção de malha. Nos resultados encontrou-se que para um único CAE na análise, o valor de 0 foi o que melhor simulou a curva fxd e fxdes. Já o modelo MR1C7 apresentou as curvas fxd e fxdes, e valores de rigidez Ki, Kser, Ku e Kc mais ajustados possíveis com os experimentos. Para parafusos inclinados (45°), tanto a consideração deste embebido (elemento de treliça) quanto com contato (elementos sólidos) não foi capaz de simular os resultados experimentais. Além disso, parafusos com elementos sólidos apresentam uma distorção de malha considerável, além da interação de contato tornar a simulação inviável. Para a variação do CAE para o cinético, foram encontrados sérios problemas de convergência para valores do coeficiente de decréscimo (dc) acima de 0,01. Já a madeira simulada como ortotrópica apresentou melhores resultados. Por fim, o tempo de simulação do modelo MR1C7 foi equivalente a 3,245 vezes o do MR1C1. De forma geral, apenas modelos numéricos com parafusos retos (90°) têm a capacidade de prever valores experimentais.

show abstract

The Predictive Model for Stiffness of Inclined Screws as Shear Connection in Timber-Concrete Composite Floor

Cited by 9 publications

References 5 publications

Moment resisting splice of timber beams using long threaded rods and grout-filled couplers – Experimental results and predictive models

Moment resisting splice of timber beams using long threaded rods and grout-filled couplers – Experimental results and predictive models

Effect of rod-to-grain angle on capacity and stiffness of axially and laterally loaded long threaded rods in timber joints

Viabilidade da previsão do comportamento de estruturas compósitas madeira-concreto ligadas por parafusos via análise numérica 3D

Contact Info

Product

Resources

About