Resistência e deformabilidade de blocos vazados de concreto, prismas e paredes e suas correlações com as propriedades mecânicas dos materiais constituintes / Strength and deformability of hollow concrete blocks, prisms and walls and their correlation to mechanical properties of constituent materials

AUTOR(ES)

Claudius de Sousa Barbosa

DATA DE PUBLICAÇÃO

2008

RESUMO

This work aims to identify and correlate the mechanical properties of concrete and bedding mortar to the structural behavior of hollow concrete blocks, prisms and walls, by mean of physical and numerical modeling. A detailed experimental investigation was carried out by assuming as a premise the use of plastic consistency concrete to produce hollow blocks and cylindrical samples. This was done to assure the same material properties in each test series. Confinement effect in block compression tests causes a non-uniform strain distribution through face-shells and webs. This effect induces an increase of the block ultimate load. Modified block tests by reducing the confinement effect were performed. The results showed that confinement reduction brings a more uniform strain distribution, which is similar to the observed one in the central blocks of prisms and walls. A decrease of compressive strength and changes the failure mode were also evidenced. Confinement effect and influence of water loss during the curing of mortar joints were also considered. Indicative parameters about bedding mortar behavior were obtained and the resistant capacity and the failure mode of prisms and walls were associated to them. The mechanical properties of materials obtained in tests were implemented in a finite elements numerical model to analyze the behaviour of masonry elements under compression. The numerical analysis gave good predictions of strength, deformability and failure mode. Based on the numerical and experimental results, a stress and strain distribution model was realized, which enabled an experimental procedure for the determination of the block axial stiffness. Correlations and algebraic formulation were proposed for the behavior analysis and quantitative evaluation of strength and deformability of blocks, prisms and walls.

ASSUNTO(S)

blocos vazados de concreto theoretical and experimental analysis análise teórica e experimental mechanical properties of materials prisms hollow concrete blocks walls alvenaria estrutural numerical models modelos numéricos prismas paredes propriedades mecânicas dos materiais structural masonry

Documentos Relacionados

• Resistência e deformabilidade de blocos vazados de concreto e suas correlações com as propriedades mecânicas do material constituinte
• Resistência e deformabilidade de blocos vazados de concreto: correlação entre os resultados experimentais de blocos e corpos-de-prova cilíndricos
• Comportamento pós-fissuração de blocos, prismas e pequenas paredes de concreto reforçado com fibra vegetal
• Physical and mechanical properties of structural blocks produced with recycled aggregates of concrete
• Concreto auto-adensável: caracterização da evolução das propriedades mecânicas e estudo da sua deformabilidade por solicitação mecânica, retração e fluência.