Structural health monitoring and damage identification paper
Li, J, Hao, H 2014, 'Damage detection of shear connectors in composite bridges under operational conditions', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. II, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 1173-1178. ISBN: 9780994152008.
This paper investigates if the relative displacement measurements from newly developed relative displacement sensors can be used to detect the damage of shear connectors in composite bridges under operational conditions. The relative displacements between slab and girders in composite bridges are measured when the bridge subjects to moving vehicle loads and used for condition monitoring. Continuous Wavelet Transform and Hilbert-Huang Transform are applied to analyze the measured dynamic responses and to identify the damage of shear connectors in the composite bridge model. To demonstrate the suitability of this new sensor and the corresponding time-frequency analysis algorithms in detecting the conditions of shear connectors, a laboratory composite bridge was built and tested. Accelerometers and LVDT displacement sensors are also used in the experimental tests together with the relative displacement sensors. Detection results with relative displacement sensors are compared with those from acceleration and deflection measurements. The performance and reliability of using direct relative displacement measurement in detecting the shear link conditions are demonstrated by experimental investigations.