Structural monitoring by curvature analysis using interferometric fiber optic sensors

Abstract

All structures undergo deformations under the effects of loads or degradation of the constituent materials. The deformations of any structure (bridges, dams, frames, shells, tunnels, towers, wings, trusses,. . .) contain a lot of information about its health state. By measuring these deformations it is possible to analyse the loading and aging behavior of the structure. The presented method analyses a structure by subdividing it into sections and cells. The deformation of each of these macro-elements is first analysed separately to obtain local information about the materials, and then combined to provide insight on the global behavior. Examples of these techniques applied to civil engineering structures fitted with long-gage-length fiber optic sensors show the variety of information that can be obtained using this powerful analysis technique.

Contactless recognition of concrete surface damage from laser scanning and curvature computation

“…Direct contact is required also for the strain sensors, which provide the maximum strain and therefore the corresponding stress in a structural member, see e.g. [7]. Ultrasonic [8] and radiographic [9] methods are also currently used.…”

Stress Estimation of Beam Structures Based on 3D Coordinate Information from Terrestrial Laser Scanning

“…For this reason, various te chniques for measurement of structural responses have been developed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Estimation of Vertical Deflections in Concrete Beams Through Digital Close Range Photogrammetry

“…Lately, optical fibre sensors (Inaudi et al, 1998;Shen et al, 2010) and inductive laser transducers or linear voltage displacement transducers (LVDT) have also been implemented (Mills et al, 2001). These processes usually have either low or no redundancy, they can measure changes only at the point, where they are installed, and typically the measurement is done in only one direction (Gordon and Lichti, 2007;Maas and Hampel, 2006).…”