Stay cables are one of the most critical structural components of a cable-stayed bridge. However, stay cables readily
suffer from fatigue damage, corrosion damage and their coupled effect. Thus, condition monitoring of stay cables is
important to ensure the integrity and safety of a bridge. Glass Fibre Reinforced Polymer Optical Fibre Bragg Grating
(GFRP-OFBG) cable, a kind of fibre Bragg grating optical sensing technology-based smart stay cables is used in this
study. The application of the smart stay cables on the Tianjin Yonghe Bridge was demonstrated and the vehicle live load
effect and fatigue effect of smart stay cables were evaluated based on field monitoring data. Furthermore, the life-cycle
cost analysis method of the stay cables is established. Finally, based on the nonlinear reliability index deterioration
model, the optimal design of stay cable with different reference period is evaluated.
The ductility of high strength concrete containing nano-TiO2 were experimentally studied and compared with that of
plain concrete and concrete containing silica fume by stress-strain relationship. The results showed that the ductility of
high strength concrete containing nano-TiO2 were better than that of plain concrete and concrete containing silica fume,
which demonstrated that it is an available and effective way to improve ductility of high strength concrete by means of
mixing nanophase materials into concrete. The origin of nano-particles improving ductility of high strengthen concrete
was also preliminary interpreted.
KEYWORDS: Bridges, Acoustic emission, Sensors, Ferroelectric materials, Corrosion, Monte Carlo methods, Structural health monitoring, Failure analysis, Transformers, Signal detection
The stay cables are generally regarded as the most critical component of the cable-stayed bridges. Normal vehicle loads
will cause fatigue damage of the cables made of parallel steel wire. In addition, the stay cables also suffer from the
challenges of corrosion, fatigue and their coupled effects. Therefore it is important to detect the damage of wires with the
cables before the cables fails catastrophically. Structural health monitoring (SHM) is now regarded as an essential tool
to evaluate the status of the structure. In this paper, a corroded parallel steel wire, which are removed from a real bridge,
was carried out under the fatigue loading to simulate the damage procedure, i.e. the producing and propagation of
damage or crack. Piezoelectric transformers bonded to the cable are used to monitor and evaluate the damage
propagation during the test. Moreover, the fatigue properties of corroded parallel wire cable are investigated in this
paper.
The ductility of high strength nano-TiO2 reinforced cement-based composites were experimentally studied and compared
with that of plain cement-based composite and cement-based composite containing silica fume by stress-strain
relationship. The results showed that the ductility of high strength cement-based composite containing nano-TiO2 were
better than that of plain cement-based composite and cement-based composite containing silica fume, which
demonstrated that it is an available and effective way to improve ductility of high strength cement-based composite by
means of mixing nanophase materials into cement-based composite. The origin of nanoparticles improving ductility of
high strengthen cement-based composite was also preliminary interpreted.
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