ACTIVE BOLTED CONNECTION PERFORMANCE MONITORING OF A CONCRETE-STEEL COMPOSITE GIRDER WITH PIEZOCERAMICS
Steel-concrete composite components are widely used in high-rise buildings and large-span bridges where bolts are the popular connection method employed to integrate the steel beam and concrete slab. The connection plays an important role in carrying the horizontal shear force in the interface between the steel beam and the concrete slab. Therefore any deterioration and failure in the connectors lead to a decrease in structural integrity, structural stiffness and load carrying capacity. Because of the inaccessibility of shear connectors, it is crucial to develop suitable nondestructive bolt connection performance monitoring methods for steel-concrete composite components. In this paper, a bolt connection performance monitoring for a steel-concrete composite girder with piezoceramics was proposed. The interfacial damage was mimicked by removing some bolts. Electromechanical impedance (EMI) measurement was carried out on piezoceramic sensors on the concrete slab and steel beam with different distances from the loosened or removed bolts. Based on the EMI measurement within different frequency bands, two overall statistics damage metrics including the root mean square deviation (RMSD), the mean absolute percentage deviation (MAPD) were employed to compare the EMI spectra and to assess the presence of the bolt connection damage. Results showed both the EMI based damage metrics can monitor the condition of the bolts of the concrete-steel composite girder. Moreover, discussion on the sensitivity region of the EMI based monitoring method was carried out. Results show the proposed approaches have great potential to be applied in practice for the interface performance monitoring detection of inaccessible areas of composite structures.
Fan Jiang Bin Xu G.Song
College of Civil Engineering,Hunan University,Changsha,410082,China Department of Mechanical Engineering,University of Houston,Houston,TX,77004,USA
国际会议
厦门
英文
462-467
2011-10-28（万方平台首次上网日期，不代表论文的发表时间）