Control of cantilever bridge construction by identification. A sensitivity analysis of some construction errors

Samartín, Avelino and Corbal Álvarez, Jesús J. (1997). Control of cantilever bridge construction by identification. A sensitivity analysis of some construction errors. In: "Proceedings of the IASS international symposium '97 on shell & spatial structures", 10-14 de Noviembre, 1997, Singapur (República de Singapur). ISBN 981-00-8905-8. pp. 727-733.

Description

Title: Control of cantilever bridge construction by identification. A sensitivity analysis of some construction errors
Author/s:
  • Samartín, Avelino
  • Corbal Álvarez, Jesús J.
Item Type: Presentation at Congress or Conference (Article)
Event Title: Proceedings of the IASS international symposium '97 on shell & spatial structures
Event Dates: 10-14 de Noviembre, 1997
Event Location: Singapur (República de Singapur)
Title of Book: Design, Construction, Performance & Economics: Proceedings of the International Symposium of Shell and Spatial structures
Date: 1997
ISBN: 981-00-8905-8
Volume: 2
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Mecánica de Medios Continuos y Teoría de Estructuras
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Many structures are built throughout various stages of construction. Typically, the process of control of the construction is undertaken by measuring the variations of its geometry at different points of the structure during the construction period. The differences between the values observed during this process of control and the theoretical values computed by means of a structural model, can mainly be explained due to the existing differences between the preconceived material properties and the real ones. Concrete bridge built by cantilevering represents a frequent example in which the control of the deviations from the forecast geometry is very important from the aesthetic and the functional point of view. These deviations can be very large at a certain stage of construction due to the cumulative effects of the deviations of previous stages and also due to the high dispersion of properties that concrete presents in comparison with other materials such as steel. Moreover, these deviations must be corrected during the cantilevenng procedure since it is normally required that, during the construction phase in which the two cantilevers are joined at the center of the span, these do not present apparent geometrical differences. This paper sets forth a procedure of control which may predict the final bridge geometry at each construction stage. For this prediction, it is necessary to take into account the material properties worked out from the measurements taken during the process of control carried out up to the current construction stage, instead of using the values stated by the initial project. Following this procedure, it is possible to introduce punctual modifications of the geometry so that the final bridge profile can be adapted to the initially assumed in the design. This control technique demands to solve successively a problem called Structural Identification. This problem consists in finding the set of characteristic parameters of a structural model that predict the geometry that best fit with the measurements of the different control stages. Normally, the Structural model itself cannot represent the exact behaviour of the real construction, therefore the best adjustment would represent the best approximation i.e. some filling differences would persist. This paper presents a sensitivity analysis of the identification procedure applied to a cantilever bridge construction with regard to the set of usual imperfections. The imperfections considered here are the following: Non homogeneity of the concrete material characteristic among different parts of the bridge. Measurements errors along the bridge construction control. Effects of other actions not explicitly considered in the identification anal ysis. Finally, a construction control procedure, based on identification techniques and alternative to the standardized ones, is proposed.

More information

Item ID: 42790
DC Identifier: http://oa.upm.es/42790/
OAI Identifier: oai:oa.upm.es:42790
Deposited by: Biblioteca ETSI Caminos
Deposited on: 13 Jul 2016 06:52
Last Modified: 13 Jul 2016 06:52
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