1,721,315 research outputs found
Dynamic impact of the debris flows on the constructions during the hydrogeological disaster in Campania -1998: Failure mechanical models and evaluation of the impact velocity
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Influence of the steel yield stress and concrete non-linearity on the evaluation of the bearing capacity of axially and eccentrically loaded steel-concrete composite columns
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
FRP-to-Concrete interface relationships under monotonic and cyclic actions
No full textExternal bonding of fibre reinforced polymer (FRP) composites has become a popular technique used worldwide for strengthening existing reinforced concrete (RC) structures.
Interaction phenomena having place at the FRP-to-concrete interface deeply affect the overall behaviour of RC beams externally strengthened by FRP. Consequently, several proposals
have been carried out for describing the relationship between FRP-to-concrete relative displacements and interface shear stress. The present paper is mainly devoted to comparing the effectiveness of different identification methods for shear-stress-relative-slips law throughout the FRP-to-concrete interface. Several experimental results (pull-out tests under monotonic and cyclic actions), both available in the scientific literature and carried out directly by the authors, are utilised with this aim. The first cyclic delamination tests, carried out by the authors, allow a preliminary investigation on the influence of cyclic external actions on the bond of FRP reinforcement to the concrete substrate
Steel and concrete composite beams with flexible shear connection: “exact” analytical expression of the stiffness matrix and applications
No full textThe present paper deals with steel–concrete composite beams in partial interaction as a result of the interface relative displacements, possibly occurring between the concrete slab and the steel beam. In particular, after a short outline of the basic assumptions of the well-known Newmark’s Theory, the closed-form analytical expressions of the corresponding stiffness matrix and the vector of equivalent nodal forces for beam in bending are presented. They completely define an “exact” 1D finite element (FE) for composite beams in partial interaction. The possibility of performing linear design-oriented analyses of composite beams by using only one element per member is the most important feature of such an “exact” FE. The closed-form expressions of both the stiffness matrix and the vector of equivalent nodal forces are generally defined as the product of constant coefficients, corresponding to the stiffness terms of simple Bernoulli beams, multiplied by various functions depending on two non-dimensional parameters which completely cover the effect of partial interaction.
A simple application is proposed for pointing out the advantages of the proposed “exact” solution. Final comments on numerical instabilities possibly affecting the proposed solution, their practical significance and the way for fixing them are also reported at the end of the paper, leading to a complete formulation of an “exact” finite element which could be easily implemented within the usual numerical codes to analyze steel–concrete composite beams in partial interaction
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