Moving train loads and parameters identification on a steel truss girder model

Abstract

This paper presents a new system for moving train loads and its parameters identification. A model of simply supported truss girder is constructed according to a side span of Poyang Lake continuous steel truss girder. The moving train loads are simulated by a model train with three coaches. In this system, time history displacements of measurement stations on bridge are simultaneously measured by using displacement image monitoring system when the model train moves across the bridge. Basic parameters of the model train, including moving speed, axle numbers and axle spacing, are identified with a parameter acquisition system. Finally moving train loads are identified by using multi-axle moving loads identification system. A series of experiments have been conducted. Effects of a few main parameters on the proposed system are investigated. The result shows that this system is a feasible and accurate method for the identification and makes preparations for the practical practice in engineering.