Ambient vibration testing and structural evaluation of an historic suspension footbridge

Gentile, Carmelo; Gallino, N.

doi:10.1016/j.advengsoft.2007.01.001

Cited by 73 publications

(40 citation statements)

References 15 publications

(21 reference statements)

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“…The most popular algorithms currently used for system identification from ambient vibration data are the frequency domain decomposition (FDD) method (Brincker et al, 2001b) and the stochastic subspace identification (SSI) method (Van Overschee and De Moor, 1993). Both methods are quite robust, have been extensively validated, and have been used successfully by many researchers to process ambient vibration data (Gentile and Gallino, 2008;Lamarche et al, 2008;Structural Vibration Solutions A/S, 2010). In fact, these methods have been incorporated in specialized commercial software packages.…”

Section: Ambient Vibration Testsmentioning

confidence: 99%

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

Gilles

McClure

2012

Structures Congress 2012

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Structural engineers routinely need to make assumptions about the dynamic properties (natural periods, mode shapes, and damping) of a building to simulate its response to dynamic loads, such as strong winds or earthquake ground motions. However, the assumed properties may significantly differ from those of the actual building, once it is constructed, due to differences between the idealized model and in situ conditions. The main objectives of this study are to evaluate how common models and assumptions used to predict the dynamic properties of buildings compare to those measured in actual buildings, and to develop improved prediction models.To this end, ambient vibration measurements were performed in 39 buildings on the island of Montréal and the dynamic properties of up to six vibration modes were identified, for each of these buildings, using the enhanced frequency domain decomposition method. Though the initial goal was to obtain a representative sample of different types of buildings, 27 of these 39 buildings turned out to be reinforced concrete buildings with shear walls providing the main resistance to lateral loads. Hence, the scope of this study was narrowed to the dynamic properties of reinforced concrete shear wall (RCSW) buildings. The measured dynamic properties of this subset of 27 buildings were then used to evaluate different models, proposed in building codes and in the literature, to predict the natural periods and damping characteristics of these types of buildings. Finally, simple models to predict the natural periods of torsion and second translation modes were proposed based on regression analyses. These models agree very well with those that have been proposed in the literature. Again, equations corresponding to different probability levels (mean, mean minus one standard deviation, and mean plus one standard deviation) were produced as a measure of uncertainty.This study should help engineers select realistic values of the dynamic properties of RCSW buildings for structural analysis and design, and should ultimately improve engineers' ability to predict the dynamic response of these buildings. Further, the proposed models could lead to improved recommendations in building codes.iii This research could not have been possible without the help of many building owners and managers, who allowed our team to perform vibration measurements in their buildings. I would also like to thank the numerous graduate and undergraduate students who were involved in these tests for both their participation and the stimulating discussions that often ensued:

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Section: Ambient Vibration Testsmentioning

confidence: 99%

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

Gilles

McClure

2012

Structures Congress 2012

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“…Según la memoria de cálculo del postensado de Mora [9], las fuerzas de tensado se distribuyen como se muestra en la Tabla 8.…”

Section: ) Fuerzas De Postensadounclassified

Determinación de la capacidad resistente de puentes viga-losa en concreto postensado mediante pruebas de vibración ambiental: Caso de estudio Puente El Ramo

2017

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Resumen--Para monitorear la salud estructural de un puente durante su vida útil es necesario disponer de modelos numéricos que permitan, con base en los cambios de la respuesta estructural del mismo, detectar la posible existencia de daño. Por esta razón y para profundizar en el conocimiento del comportamiento estructural de los puentes en vías terciarías del departamento de Santander, el grupo de investigación en materiales y estructuras -INME -de la UIS, aprovechó una serie de puentes en concreto postensados que iban a ser inundados por la creación del embalse de Hidrosogamoso, convirtiéndose en un laboratorio a escala real. Dentro de estos se encuentra el puente El Ramo, el cual es un puente de 31 metros de longitud de tipo viga y losa, compuesto por un par de vigas de concreto postensado simplemente apoyadas. Sobre este puente se realizaron ensayos de tipo estático para caracterizar su deformación y pruebas de vibración ambiental para identificar sus propiedades dinámicas. Estos datos se utilizaron como herramienta de calibración del respectivo modelo numérico, el cual sirvió para evaluar la capacidad resistente del mismo, siguiendo los criterios planteados por la norma colombiana de puentes vigente (CCP-2014).Palabras claves--concreto postensado, ensayos de vibración ambiental, propiedades dinámicas, capacidad resistente Abstract--To monitor the structural health of a bridge over its lifetime is necessary to have numerical models to, based on changes in the structural response of it, detect possible damage. For this reason and to deepen the understanding of the structural behavior of bridges on local roads of the Department of Santander, the research group in materials and structures -INME -UIS, takes a series of post-tensioned concrete bridges that were to be flooded by the impounding of the reservoir of Hidrosogamoso, becoming a full-scale laboratory. Among these is El Ramo bridge, which is a bridge beam and slab type, comprising a pair of post-tensioned concrete beams simply supported 31 meters. This bridge was made, firstly statical tests to characterize its deformation and others ambient vibration tests to identify its dynamic properties. These data were used as a calibration tool the respective numerical model, which served to evaluate the resistant capacity of the same, according to the criteria set by the Colombian norm existing bridges (CCP-2014).

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“…In recent years, the modal characteristics of bridges in case of various excitation forces (traffic, wind, and earthquake) have been investigated by various researchers since bridges serve a major role for transportation network. The target of these studies were mostly to (1) control the accuracy of the analytical modelling of the bridge to use it during the life span of the bridge and/or (2) carry out a long term monitoring under service loads (AbdelGhaffar and Scanlan 1985;Chang et al 2001;Hiesh et al 2006;Huffman et al 2006;Gentile and Gallino 2008;Picozzi et al 2010;Apaydin et al 2012). Furthermore, in case of identifying the dynamic characteristics of cultural heritage structures, vibration-based methods are of vital importance since these methods respond to the preservation needs of these types of structures (Ivorra and Pallares 2006;De Stefano 2007;D'ambrisi et al 2012;Foti et al 2012;Asteris et al 2014;Votsis et al 2012;Chrysostomou et al 2005Chrysostomou et al , 2008.…”

Section: Introductionmentioning

confidence: 99%

Field testing of substandard RC buildings through forced vibration tests

Göksu

Inci

Demir

et al. 2015

Bull Earthquake Eng

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In this study, forced vibration tests were conducted on two full-scale substandard reinforced concrete (RC) buildings to obtain the dynamic characteristics (modal frequencies and damping ratios) of these buildings. These tests were carried out before and after quasi-static lateral loading cycles. Through quasi-static cyclic loading, which was applied only in x direction of the buildings, the buildings were forced to experience specific damage states in a controlled manner. The original aspect of the study is investigating the rates of changes of the dynamic characteristics with the increasing damage. According to the test results, it was observed that modal frequencies tend to decrease while damping ratios for different modes tend to increase with the increasing levels of damage. In addition, finite element models of the buildings were established and modal analyses were performed for the undamaged state. Model updating was carried out in order to determine the optimal means of improving the accuracies of the finite element models of the test buildings. Experimentally identified modal frequencies of the buildings and those computed using finite element model were found to be consistent. Since the buildings tested in this study represent most of the existing substandard RC buildings in Turkey, determining the changes in dynamic characteristics with the increasing damage would be useful in the decision of demolishing/retrofitting of these types of buildings after potential future earthquakes.

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Ambient vibration testing and structural evaluation of an historic suspension footbridge

Cited by 73 publications

References 15 publications

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

In Situ Dynamic Characteristics of Reinforced Concrete Shear Wall Buildings

Determinación de la capacidad resistente de puentes viga-losa en concreto postensado mediante pruebas de vibración ambiental: Caso de estudio Puente El Ramo

Field testing of substandard RC buildings through forced vibration tests

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