Assessment of nonlinear seismic performance of a restored historical arch bridge using ambient vibrations |
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Authors: | Barış Sevim Alemdar Bayraktar Ahmet Can Altunişik Sezer Atamtürktür Fatma Birinci |
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Institution: | 1.Department of Civil Engineering,Karadeniz Technical University,Trabzon,Turkey;2.Department of Civil Engineering,Gümü?hane University,Gümü?hane,Turkey;3.Department of Civil Engineering,Clemson University,Clemson,USA |
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Abstract: | Historic masonry arch bridges are vital components of transportation systems in many countries worldwide, ensuring the ready
access of goods and services to millions of people. The structural failure of these historic structures would severely and
adversely impact the economies of these nations due to the massive disruptions of transportation systems accompanying such
failures. To successfully maintain these aging masonry structures, performance assessment must incorporate the unique mechanical
characteristics of masonry. Therefore, the preferred analysis technique must go beyond a linear approach. This study assesses
the earthquake performance of a restored historical masonry arch bridge through nonlinear finite element analysis incorporating
the Drucker–Prager damage criterion. The case study structure is the Mikron Arch Bridge, a nineteenth century Ottoman Era
structure built over the Firtina River near Rize, Turkey, and restored in 1998. The Mikron Arch Bridge was first subjected
to ambient vibration testing, during which accelerometers were placed at several points on the bridge span to record the bridge
vibratory response. The investigators then used Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification
techniques to extract the experimental natural frequencies, mode shapes, and damping ratios from these measurements. Experimental
results were compared with those obtained by the linear finite element analysis of the bridge. Good agreement between mode
shapes was observed during this comparison, though natural frequencies disagree by 8–10%. The boundary conditions of the linear
finite element model of Mikron Arch Bridge are adjusted such that the analytical predictions agree with the ambient vibration
test results. By introducing the Drucker–Prager damage criterion, the calibrated linear FE model was next extended into a
nonlinear model. Nonlinear analysis of seismic behavior of Mikron arch bridge was performed considering the acceleration record
of Erzincan earthquake in 1992 that occurred near the Mikron Bridge region. The displacement and stress results were observed
to be allowable level of the stone material. Moreover, linear FE model calibrations elicited a significant influence on the
nonlinear FE model simulations. |
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