Philippe Van Bogaert | Ghent University (original) (raw)

Papers by Philippe Van Bogaert

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Le passage de vehicules ferroviaires a grande vitesse sur des ponts provoque des accelerations im... more Le passage de vehicules ferroviaires a grande vitesse sur des ponts provoque des accelerations importantes, diminuant le confort des voyageurs. Ces ponts doivent donc posseder une raideur flexionnelle importante. L'introduction d'un modele de la suspension d'une voiture et d'une distribution en dent de scie de l'evolution dans le temps des charges, permet d'etudier le comportement dynamique de l'ensemble de la structure et d'un train. Les resultats de l'application du modele sur le cas d'un pont bow-string metallique de 115 m, sont compares aux valeurs mesurees durant les parcours d'essai pour l'acceptation de la ligne de Paris a Bruxelles. Cette comparaison confirme la valeur de la methode utilisee, puisque les conditions de confort sont excellentes, les accelerations verticales restant bien au-dessous de 1 m/s 2 . Toutefois, la raideur de la structure doit etre superieure aux exigences de l'Annexe 2 de prEN 1990.

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The paper describes different designs and optimization of a tied arch railway bridge. The first d... more The paper describes different designs and optimization of a tied arch railway bridge. The first design considered was a tied arch with vertical suspension hangers. Three further designs using triangulated hangers were also considered. The design criterium for fatigue damage due to the several loading spectra was chosen to be the spectrum corresponding to the largest local stress variation. In the case of a completely optimized structure, fatigue resistance becomes more limiting than ultimate limit state of load-carrying capacity. For the covering abstract of the conference see IRRD 858334. The French title of this paper is:- Resistance a la fatigue d'un ponts-rail. The German title of this paper is:- Ermuedungswiderstand einer Eisenbahnbruecke.

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Proceedings of International Structural Engineering and Construction, Nov 1, 2015

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Report, 2023

Three arch-type as well as 3 cable supported alternatives have been developed for footbridges abo... more Three arch-type as well as 3 cable supported alternatives have been developed for footbridges above historic sites. The two categories of arches and cable supported structures exhibit a completely different behaviour, since the latter are more flexible. The first cable variant is a straight intersection of variable width. In comparison with an arch, it is striking that the deformability is much greater the fundamental frequencies being significantly lower. However, the characteristic values for dynamics, such as the Scruton number and the accelerations of the bridge deck are significantly better. To span the site of 200 m in length, pylons of 46.7 m in height are needed. As a second alternative, a semi-circular suspension footbridge of variable height has been developed. Direct comparison with an arch counterpart is not evident. However, it could be deduced that this structure has a fairly high frequency and is also not sensitive to the important types of vibration. A full elevated walkway around a circular site can certainly be compared to its arch-shaped counterpart. Despite the lower fundamental frequency, the higher flexibility and the increased consumption of steel, the cable-supported structure performs better as for its dynamic behaviour.

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Proceedings of International Structural Engineering and Construction, Nov 1, 2015

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Report, 2023

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