EXPERIMENTAL STUDY OF BRIDGE SEISMIC ISOLATION SYSTEMS WITH OR WITHOUT SUPPLEMENTAL ENERGY
The seismic response of isolated bridges is studied experimentally for three different isolation systems which provide, separately or in combination, lengthening of the period and additional energy dissipation. A multi-span highway bridge is subjected to hybrid (sub-structured pseudodynamic) testing, with on-line correction of the measured restoring forces for the velocity-dependent properties of the isolation devices. Common (low damping) elastomeric bearings, lead-rubber bearings (LRBs) and elastomeric bearings coupled with magneto-inductive dissipation devices were tested at several levels of excitation. A broad parametric experimental study was conducted regarding the influence of certain parameters such as the mass of the deck and the level of ground motion. The elastomeric bearings did not satisfy the design requirement of 200% strain at ultimate, but displayed a somewhat higher damping ratio than anticipated. The LRBs provided effective bridge protection reaching almost a strain level of 175% at ultimate and an effective damping ratio of 16%. The combination of elastomeric bearings with a magneto-inductive damper proved to be extremely efficient in containing the response and protecting both the bridge and the bearings.
Bridges hybrid testing isolation devices seismic isolation sub-structuring
S.N. Bousias E. Strepelias X. Palios M.N. Fardis S. Raftopoulos
Structures Laboratory, Dept. of Civil Engineering, University of Patras, Patras, Greece ELEMKA LTd., 41-45 Marinou Antypa St, Athens 141 21, Greece
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）