Search results for "Forward analysis"

showing 3 items of 3 documents

Construction sequence analysis of long-span cable-stayed bridges

2018

Abstract In cantilever construction of long-span cable-stayed bridges the stressing sequence of stays is fundamental for establishing the final configuration of the bridge. The structural behaviour of these bridges is usually evaluated through a forward staged construction analysis, in which the values of the prestressing forces to be applied to stays are the main unknowns. A unified procedure for determining the initial cable forces and for analyzing the entire sequence is presented here, considering the geometric nonlinearity of stays through the Dischinger equivalent elastic modulus. The target is the simultaneous determination of the initial cable forces with the simulation of the const…

CantileverComputer science0211 other engineering and technologiesNAPS020101 civil engineering02 engineering and technologyBridge (nautical)0201 civil engineeringDeckStress (mechanics)Effects of uncertainties021105 building & constructionPylonForward analysisCivil and Structural EngineeringSequenceConstruction sequencebusiness.industryProbabilistic logicProbabilistic approachCable-stayed structures; Construction sequence; Effects of uncertainties; Forward analysis; NAPS; Partial scheme; PES; Probabilistic approach; Civil and Structural EngineeringStructural engineeringPESSettore ICAR/09 - Tecnica Delle CostruzioniNonlinear systemPartial schemebusinessCable-stayed structures
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Partial Elastic Scheme Method in Cantilever Construction of Concrete Arch Bridges

2013

AbstractIn this paper, a study about stay stressing procedures of concrete arch bridges built by cantilevering with temporary stays is presented. Particularly, the partial elastic scheme method is proposed to find the initial cable forces, and a forward procedure is implemented to follow the actual sequence of construction by extending a procedure already applied to concrete cable–stayed bridges. The theoretical treatment is followed by a numerical application on a case study of a concrete arch bridge, and a comparison between initial cable forces found by the partial elastic scheme method and classical backward analysis is presented here. Results show the effectiveness of the proposed proc…

EngineeringCantileverbusiness.industryCantilever constructionStaysBuilding and ConstructionStructural engineeringLimitingArch bridgeArch bridge; Partial elastic scheme; Cantilever construction; Stays; Forward analysisArch bridgeSettore ICAR/09 - Tecnica Delle CostruzioniPartial elastic schemeBending momentStayArchElasticity (economics)businessForward analysisCivil and Structural Engineering
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Non-Linear Hysteretic Instability in Rotating Machinery

2013

The destabilizing influence of the shaft hysteresis on the supercritical whirl of rotating machines can be efficiently counterbalanced by proper external dissipative sources in the supports and/or anisotropic suspension systems. The hysteretic effect may be treated either by dry or viscous models obtaining different but somehow similar results in the hypothesis of small dissipation levels. Thus the linear viscous assumption is often accepted as a crude approximation for a straightforward analysis of the whirling instability. Nevertheless the internal friction should be regarded most likely as non-linear and could be approximated for example by Coulombian models taking thus into account also the releasing effect of some shrink-fit coupling present in the mechanical assembly.
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