This paper presents a macro-element model using an equivalent multi-strut approach to analyse the non-linear response of structural frames infilled with masonry. The usability, advantages and deficiencies of this model are assessed based on experiment results as well as comparisons with previous equivalent mono-strut models. The formulas used to convert the infilled masonry into a multi-strut model are based on an analysis of the beams on a Winkler elastic foundation, in which the beams and columns are represented as ‘beams’ and the masonry infill is the ‘elastic foundation’. The analytical results for the equivalent multi-strut model show that the non-linear behaviour of the infilled frames corresponds closely to experimental results using reinforced concrete frames and autoclaved aerated concrete block masonry, and is found to be more suitable for some problems than previous equivalent mono-strut models.
Addition of discrete steel fibers to concrete enhances its properties, especially in the areas of serviceability and toughness. In this paper, two semi-empirical methods developed from ACI 318-05 and TCXDVN 356:2005 are proposed to calculate the flexural strength of structures reinforced with both conventional steel bars and steel fibers for analysis and design purposes. The analytical and experimental results are discussed.
2 3This paper presents experimental studies on the behaviour of infilled reinforced-concrete (RC) frames using autoclaved aerated concrete blocks with different interface conditions between the infilled masonry and RC frames. The experiments were conducted on three groups with a total of five models: two completely infilled frames, two incompletely infilled frames and a bare frame (to verify the results). The behaviour of the structure was evaluated in terms of the level of stiffness degradation, the lateral displacement, the energy dissipation capacity and the displacement ductility ratio. The finite-element method calculation results for the modified equivalent strut model were in good agreement with the experimental results in the elastic stage.
This paper present the displacement-based finite element formulation for the non-linear analysis of composite steel-concrete beams with partial interaction that occurs due to deformation of shear connectors. The formuation considers the non-linear behaviour of materials as well as shear connectors. The finite element for composite beams which is based on Newmark kinematical model has 8 DOF. Numerical applications are perfomed for simply supported beam and continuous beams. The results are compared with experimental data in order to validate the reliability of the formulation. The results are also disscussed for influence of partial interaction and non-linear behaviour of materials as well as shear connectors on behaviour of composite beams.
This paper presents experimental studies on the behaviour of infilled reinforced-concrete (RC) frames using autoclaved aerated concrete blocks with different interface conditions between the infilled masonry and RC frames. The experiments were conducted on three groups with a total of five models: two completely infilled frames, two incompletely infilled frames and a bare frame (to verify the results). The behaviour of the structure was evaluated in terms of the level of stiffness degradation, the lateral displacement, the energy dissipation capacity and the displacement ductility ratio. The finite-element method calculation results for the modified equivalent strut model were in good agreement with the experimental results in the elastic stage.
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