|dc.description.abstract||The use of virtual experiments of welded steel plate girders are commonplace in
modern structural research. One key factor in the success of using such numerical
analysis is the availability and reliability of input data including imperfections such
as initial deformations and residual stresses. In this research a methodology combining
experimental and numerical work is developed in order to use virtually fabricated
welded specimens, which include the imperfections as a result of the manufacturing
process, in virtual experiments.
A series of experiments are performed to calibrate and validate the numerical
models. Temperature measurements are conducted in a steel structure factory during
the welding of plate girders. The measurement methodology developed combines
two types of measurements using an infrared thermometer without disturbing the
fabrication process itself. The residual stresses are measured using a modified hole
drilling method. Geometrical imperfection measurement results are also available
from other related projects.
For the numerical simulation of welding a mixed time integration scheme is proposed.
For the modelling of the heat source of welding an “equivalent prismatic
heat source model” is developed, which is very robust and allows for very simple
calibration. Both thermal and thermal stress analyses of the welding process are
performed including a large number of parametric studies. The residual stress measurements
are also numerically investigated and calibration tables are developed to
evaluate the measurements considering inaccuracies in their execution.
The fabrication of full size plate girders is simulated. The calculated and measured
web deformations are compared and reasonable agreement is found. Finally,
to demonstrate and summarise the achievements of this research, a virtual specimen
is used in a virtual experiment in which the ultimate behaviour of a plate girder is
|dc.publisher||Engineering and Physical Sciences||en_US
|dc.rights||All items in ROS are protected by the Creative Commons copyright license (http://creativecommons.org/licenses/by-nc-nd/2.5/scotland/), with some rights reserved.||
|dc.title||Virtual fabrication of full size welded steel plate girder specimens||en_US