Publications de Vasileios Grigoriou

Fatigue Strength Upgrading of Cover Plate Ends by Welded Extensions in Existing Steel Bridge Girders

Alain Nussbaumer, Vasileios Grigoriou, Dimitrios Lignos

This paper investigates the fatigue upgrading of typical cover plate joint connections in existing steel bridge girders through cover plate extension. The upgraded detail is created by removing the existing transverse end weld, then welding the extension t ...

2018

Round robin on local stress evaluation for fatigue by various FEM software

Alain Nussbaumer, Vasileios Grigoriou

The objective of this Round Robin is to assess the software influence on the structural/local stress values as determined by means of various methods. In particular the influence of (a) FEM software solver, (b) potentially software-depending element charac ...

2016

Monitoring-based safety verification at the Ultimate Limit State of fracture of the RC slab of a short span railway underpass

Eugen Brühwiler, Vasileios Grigoriou

The examination value of the railway traffic action effect is calculated from long-term monitoring data without resorting to load models and structural analysis. Monitoring data are obtained from measurements on a short span RC slab bridge. The action effe ...

Elsevier Science Bv2016

Long term monitoring of traffic action effect of a short span RC railway bridge for safety examination

Eugen Brühwiler, Vasileios Grigoriou

2016

Monitoring of strain profile variations in the RC slab of a short span railway bridge

Eugen Brühwiler, Vasileios Grigoriou

A novel monitoring scheme oriented towards the structural examination of reinforced concrete slabs subject to railway traffic action is presented. Monitoring is based on the measurement of the mean axial strain profile variation in the cross-section of the ...

Springer Heidelberg2016

Advanced fatigue theory and structural response monitoring for safety verification of existing RC slabs subject to railway traffic

Vasileios Grigoriou

Experience has shown that when the models and methods that have been developed for the design of new structures are â blindlyâ used for the examination of existing ones, the management of civil infrastructure lacks substantially in financial efficiency ...

EPFL2015

Probability of observable flaw initiation at high cycle fatigue

Eugen Brühwiler, Vasileios Grigoriou

Fatigue evolution during the flaw initiation phase and under high cycle fatigue conditions is described at the level of the representative volume element by the probability that this element fails in a given period of time under given stimulus. This probab ...

Elsevier2015