Structural Engineering and Mechanics

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Field testing of a seismically isolated concrete bridge

  • Chang, K.C. (Department of Civil Engineering, National Taiwan University) ;
  • Tsai, M.H. (Structural Engineering Department II, China Engineering Consultants, Inc.) ;
  • Hwang, J.S. (Department of Construction Engineering, National Taiwan University of Science and Technology) ;
  • Wei, S.S. (Department of Civil Engineering, National Taiwan University)
  • Received : 2001.06.25
  • Accepted : 2003.06.03
  • Published : 2003.09.25
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Abstract

The first seismically isolated structure in Taiwan was completed in early 1999. Seven new bridges of the Second National Freeway located at Bai-Ho area, a region which is considered to be of high seismic risk, have been designed and constructed with lead-rubber seismic isolation bearings. Since this is the first application of seismic isolation method to the practical construction in Taiwan, field tests were conducted for one of the seven bridges to evaluate the assumptions and uncertainties in the design and construction. The test program is composed of ambient vibration tests, forced vibration tests, and free vibration tests. For the free vibration tests, a special test setup composed of four 1000 kN hydraulic jacks and a quick-release mechanism was designed to perform the function of push-and-quick release. Valuable results have been obtained based on the correlation between measured and analytical data so that the analytical model can be calibrated. Based on the analytical correlation, it is concluded that the dynamic characteristics and free vibration behavior of the isolated bridge can be well captured when the nonlinear properties of the bearings are properly considered in the modeling.

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References

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