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Volume/thrust optimal shape criteria for arches under static vertical loads

Journal of Traffic and Transportation Engineering(English Edition) 2018年第6期5卷 503-509页

作者： Giuseppe Carlo Marano francesco trentadue Rita Greco Ivo Vanzi Bruno Briseghella DICAR Department of Civil Engineering and ArchitectureTechnical University of BariBail 70125Italy College of Civil Engineering Fuzhou UniversityFuzhou 350108China DICATECH Department of Civil EngineeringEnvironmentTerritoryBuilding and ChemicalTechnical University of BariBari 70125Italy Department of Engineering and Geology University of Chieti-Pescara "G.d'Annunzio"Pescara65127Italy

Arches are widely used when large spans are necessary, e.g. to overpass large rivers, and further possess unquestioned aesthetics advantages. Their structural efficiency depends primarily on optimal material exploitation, i.e. minimization of internal stress eccentricity,and on minimization of structural material volume. An efficient structure, under these terms, further requires simpler and lighter scaffolding, contributing in minimizing construction *** arches have millenary use and many researches dealing with this typology are available in literature, there is still scope for design optimization. The proposed study is framed within this context. Investigation is limited to statically determinate plane arches under vertical load. The problem of finding the profile of an equal strength catenary subjected to its self-weight is spread out to the case of an inverted catenary of equal strength under its self-weight and an external constant load. In the first optimization step, constant normal stress is imposed at all sections, to maximize material exploitation, and the resulting arch centerline shape is computed in closed form. In the second step, the ensemble of foundations and arch is considered and optimized, taking the linear combination of arch weight and thrust as objective function. The linear combination is dependent on a single variable, and minima of the objective function(i.e. optimal geometric shape parameters) are computed and charted to be simply used in the design process.

关键词： Plane arch Vertical loads Optimal shape Volume/thrust objective functions Analytical solution

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Bending Stiffness of Truss-Reinforced Steel-Concrete Composite Beams

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Open Journal of Civil Engineering 2014年第3期4卷 285-300页

作者： francesco trentadue Erika Mastromarino Giuseppe Quaranta Floriana Petrone Giorgio Monti Giuseppe Carlo Marano Department of Civil Engineering and Architecture Technical University of Bari Bari Italy Metal.Ri s.r.l - via Giuseppe Abbruzzese 42 - 70020 Bitetto (BA) Department of Structural and Geotechnical Engineering Sapienza University of Rome Rome Italy Department of Civil and Environmental Engineering University of California Davis CA USA

This paper is concerned with a special steel-concrete composite beam in which the resisting system is a truss structure whose bottom chord is made of a steel plate supporting the precast floor system. This system works in two distinct phases with two different resisting mechanisms: during the construction phase, the truss structure bears the precast floor system and the resisting system is that of a simply supported steel truss;once the concrete has hardened, the truss structure becomes the reinforcing element of a steel-concrete composite beam, where it is also in a pre-stressed condition due to the loads carried before the hardening of concrete. Within this framework, the effects of the diagonal bars on the bending stiffness of this composite beam are investigated. First, a closed-form solution for the evaluation of the equivalent bending stiffness is derived. Subsequently, the influence of geometrical and mechanical characteristics of shear reinforcement is studied. Finally, results obtained from parametric and numerical analyses are discussed.

关键词： Bending Stiffness Steel-Concrete Composite Beams Precast Floor Systems

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