underground engineering under high intensity earthquake, Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, P.R.China, May, 2010.5. 10. Hiroomi, I. et al. (1996). Damage to Daikai subway station. Soils and Foundations, Special Issue, Jan, 283-300. 11. Zhao, W.S., Chen, W.Z., Tan, X.J. & Huang, S. (2013). High-performance foam concrete for seismic-isolation materials of tunnels. Chinese J. Geotech. Eng. 35( 8), 1544-1552. 12. Zheng, Y.L., Yang, L.D. & Li, W.Y. et al. (2005). Earthquake resistance of underground structures. Shanghai: Tongji University
This paper presents a new type of seismic isolator that uses the principle of electromagnetic attraction and repulsion, to control the friction force between two electromagnets during earthquakes. The two electromagnets are used in conjunction with a secondary high friction dissipating and damping mechanism composed from a 10mm thick neoprene ring layer and two steel surfaces coated with Si3N4 that are used to dissipate the kinetic energy in the bridge deck at some maximum ground accelerations. The isolator utilizes tri-axial accelerometers embedded in the abutments, high current rechargeable batteries and an automated controlling unit. The presented isolator was developed specifically for a concrete bridge deck with a span of 36 meters and simple supported on two abutments, using time history electromagnetic and structural analyses. The paper presents the advantages of using this active seismic isolation system, compared to classical passive devices and the important results obtained in terms of decreasing internal forces on the substructure elements cross sections together with the reduction of relative displacements between the two electromagnets.
interesting parts of the design process for the specific case. Namely, time dependent
properties of the materials have been considered, and extensive “staged construction”
analyses have been carried out to ensure safety in each phase of the complex life of the
bridges, while at the same time guaranteeing significant cost savings.
Keywords: steel-concrete composite deck, FE analysis, seismicisolation, time-dependent
material properties, staged construction
The two viaducts share the same cross section and statical scheme, while
structures (deck and piers) develop only elastic behavior.
This papers presents a detailed review of the design process as well as a time journey
Keywords:, FE non linear analysis, seismicisolation, time-dependent material
properties, staged construction, balanced cantilever bridge
This bridge is “balanced cantilever girder” type and it is characterized by
a central 155m span, with two side symmetric 77.5m spans.
The total length of the bridge, including segments at abutments supports,
is 312.0m. The deck shows
seismic-isolated bridges. KSCE Journal of Civil Engineering, 12(3), 187-196. Heaton, T. H., Hall, J. F., Wald, D. J., & Halling, M. W. (1995). Response of high-rise and base-isolated buildings to a hypothetical Mw 7.0 blind thrust earthquake. Science, 267(5195), 206. Hejazi, F., Jilani, S., Noorzaei, J., Chieng, C., Jaafar, M., & Ali, A. A. (2011). Effect of soft story on structural response of high rise buildings. Paper presented at the IOP Conference Series: Materials Science and Engineering. Higashino, M., & Okamoto, S. (2006). Response control and seismicisolation
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REFERENCES 1. Mason, S.E. “SeismicIsolation-The Gold Standard of Seismic Protection”, Structure Magazine, California, pp. 11-14 (2015). 2. Robinson, W.H. “Lead-Rubber Hystertic Bearing Suitable for Protecting Structures During Earthquakes”, Earthquake Engineering and Structural Dynamics, Vol. 10, No. 4, pp. 593-604 (1982). 3. Roy, S.S., Dash, S.R. “Dynamic Behavior of the Multi Span Continuous Girder Bridge with Isolation Bearings”, International Journal of Bridge Engineering (IJBE), Vol. 6, No. 2, pp. 01-23 (2018). 4. Code No. 523 “Guideline for Design and
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