[PDF] Top 20 Vibration assessment of railway viaducts under real traffic using bridge-track models

... integration of the system of the dynamic equilibrium differential equations using the Newmark and the Wilson- θ ...independent of stability considerations and thus can result in a substantial ... See full document

... different models of ballasted tracks are presented in Figures 1, 2 and 3 from [5], [6], and ...three models are included in the finite element model of the bridge, which is acted by ... See full document

... response of railway bridges under the moving train is a complex task involving dynamic interaction between the vehicles and the ...the bridge; the vibration of the bridge ... See full document

... is under consideration, it is necessary to remove the effect of the supports: mitigate the perturbation by the boundary conditions themselves and prevent reflection of travelling ...“region of ... See full document

... the traffic characterization is a feature of paramount importance in a permanent monitoring system (Guo et ...a railway bridge. It allows to understand the type of traffic that ... See full document

... made of continuous filaments of polyester and has a mass per unit area of 300 g/m 2 ...for railway applications. However, because of the rather short duration of the application, ... See full document

... methods. The experimental measurements were based upon Fourier analysis of transfer function. The first 20 Experimental natural frequencies vary from 40 Hz to 1300 Hz. In actual condition femur bone is constrained ... See full document

... layout of a double-track where civil works are being carried out, requiring a full traffic closure of one track for ...number of consecutive open-line sections between stations ... See full document

... Atualmente estão em curso importantes investimentos na modernização e construção de linhas ferroviárias. Existem também vários projetos para a realização de novas obras num futuro próximo. A pré-fabricação em betão tem ... See full document

... percent of R&D investment in Portugal for each public contract above 25 million € (in place since 2008 by Decreto Lei 18/2008 and Portaria 701-J/2008) to suppliers contributed to increase Tech-Train R&D+I ... See full document

... One of the most practical tools for urban traffic monitoring is CCTV imaging which is widely used for traffic map generation and updating through human ...expansion of urban road network and ... See full document

... set of punctual loads that simulate the space variation of the load through a time variation of its ...effect of load distribution due to the rails and sleepers is ...step of  t = ... See full document

... diagnosis of failures in train traffic installations can be done in sev- eral ways: direct observations and measurements, software assisted diagnosis using specific software packages, process ... See full document

... mechanisms of energy dissipation related to friction in the supports and internal friction in the ballast in a stronger way than they are mobilized in the higher modes, for which the amplitudes of ... See full document

... usage of duarouter, the Standard algorithm, chosen by ARMIS for vehicle ...experiment, using the initial network revealed that both Iterative and Incremental algorithms reduced the error (RMSE), while ... See full document

... identification of a centenary double-deck steel-arch bridge, which underwent re- habilitation and strengthening work to integrate its UD into the light metro infrastructure network of ...study ... See full document

... quality of a hologram is frequently corrupted by speckle noise due to coherent ...quality assessment studies to address their performance and they typically focus solely on objec- tive ...performance ... See full document

... approximations of this latter, namely the Fixed speed ...SUMO using the parameters that reproduce a specific traffic condition may result in a faithful trajectory in terms of positions while ... See full document

... objective of this work was to evaluate the influence of the joint's stiffness in the structural response of the ...steel bridge. An improved model was developed for the bridge on the ... See full document

... method of joining rail lengths by bolting them together with perforated steel plates was replaced by flash butt welding, which allows for a continuous welded rail spanning several ...number of joints, ... See full document