Bayesian Logic Applied to Damage Assessment of a Smart Precast Concrete Element
This paper presents the laboratory validation of a prototype optic-fiber instrumented structural element.The element is a reduced-scalc reinforced concrete beam,of dimensions 3.8×0.3×0.5m that can be pre-stressed by an internal Dywidag bar.The sensing technology is based on a multiplexed version of the SOFO strain sensor,prepared in the form of a 3-field smart composite bar;in-line multiplexing is obtained by separating each measurement field through broadband FBGs.The experiment aims to identify the response of the sensors to differing damage conditions artificially produced in the element,including cracking and loss of prestressing.A numerical algorithm,based on Bayesian logic,is applied to real-time diagnosis: by processing the sensor measurements and prior information,the method assigns a posterior probability to each assumed damage scenario,as well as the updated probability distributions for each relevant structural parameter.With respect to classical damage detection approaches,the merit of those based on Bayesian logic is to provide not only information on the damage,but also the degree of confidence in this information.The paper discusses the ability of the system to identify the differing damage conditions.The reported test clearly shows that an occurrence such as a loss of prestressing can be recognized early with a high degree of reliability based on the strain data acquired.
Bayesian analysis Fiber optic sensors SOFO Smart structures Precast concrete
Daniele Zonta Matteo Pozzi Huayong Wu Daniele Inaudi
DIMS,University of Trento,Via Mesiano,77,38050 Trento,Italy SMARTEC SA,via Pobiette 11,CH-6928 Manno.Switzerland
国际会议
The 8th International Conference on Damage Assessment of Structures(DAMAS 2009)(第八届结构损伤评价国际学术会议)
北京
英文
351-358
2009-08-03（万方平台首次上网日期，不代表论文的发表时间）