1,720,986 research outputs found
Structural joints made by FRP and steel: a new proposal of analysis based on the progressive damage approach
No full textThe work aims to investigate the nonlinear behavior of pultruded joints and the related dissipation capacity through a three-dimensional FE progressive failure analysis of different GFRP beam-column and column-base bolted connections. Different failure criteria are adopted in the analysis and the results are compared. The failure mechanisms of the joints are discussed and the dissipation capacity is evaluated through the computation of the equivalent viscous damping coefficient related to the nonlinear hysteretic behavior. For the column-base joint, the influence of the axial load on the joint's nonlinear behavior is also investigated. The adopted analysis approach appears able to realistically simulate the failure mechanism of the joints. The analysis of the joints subjected to hysteretic cycles evidences a low dissipation capacity, while the analysis of the column-base joint puts in evidence the significant influence of the axial load on the connection's behavior
Dalla Ricerca Nazionale Coordinata Assoprem la viscosità delle Travi Prefabbricate Reticolari Miste
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Evaluation of the structural response to the time-dependent behaviour of concrete: Part 1 - An internationally harmonized format
No full textSurvey and structural modeling for the reliability assessment of the world’s largest elliptical dome at Vicoforte
No full textNumerical analysis of creep and shrinkage in high-rise concrete or steel-concrete buildings
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Performance of built-up columns made by pultruded FRP material
No full textThe paper presents the results of an experimental and numerical investigation on the performance of built-up columns made by four FRP pultruded channel shapes connected through steel bolts along the length. The experimental investigation gives prominence to the different structural behavior of this kind of column in the case of the load applied only to the composed web – two of the four channels – and the case of the load applied to the overall cross-section, aspect that strongly influences the transfer mode of stresses. The experimental outcomes are used to check the available formulas to calculate the reduced length and the critical load and are compared to the results of an appropriate FE analysis. The results of the investigation put in evidence, in particular, the effectiveness of the built-up technique in presence of pultruded FRP elements, the significant influence of the mode of load application on the performance of the columns and the interaction between local and global buckling. The influence of the type of connection between the members and of the material shear deformability on the buckling behavior of the columns is also investigated
Evaluation of the structural response to the time-dependent behaviour of concrete: Part 2 - A general computational approach
No full textThe paper presents an integral-type general computational approach for the analysis of structural effects of timedependent behaviour of concrete, with particular regard to creep, based on the coupling of the finite elements method with a numerical solution of the hereditary Volterra integral equations of aging linear viscoelasticity ensuing from the application of the linear principle of superposition. This approach does not require the conversion to a rate-type form of the integral-type viscoelastic creep constitutive law adopted by most of current creep prediction models. Simple and complex structures (as non-homogenous structures realized through sequential construction procedures), can be modelled through the adoption of this general numerical approach. Two examples of application, relative to a cable-stayed bridge and to a multi-storey building, are presented
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