INNOVATIVE CONTROL STRATEGY FOR SEISMIC POUNDING MITIGATION OF BRIDGE STRUCTURES
Damages of adjacent bridge structures due to relative responses such as poundings and unseating have been observed in many earthquakes. The isolators in bridge structures are effective in mitigating the induced seismic forces, however, the deck displacement becomes excessively large when subjected to a ground motion with unexpected characteristics, therefore increase the possibility of pounding; contribute to the unseating of bridge decks and subsequent collapse. An analytical model of expansion joints that takes account of the interaction between adjacent segments of the bridge deck and the effect of impact and restrainers is developed for nonlinear time history analysis. The numerical results show that pounding between adjacent bridge segments could amplify the relative displacement, resulting in the requirement of a longer seat width to support the deck. Pounding results in a transfer of large lateral force from a deck to the other, consequently, results in significant changes in the global response of the participating structural systems. So it is effective to provide a shock absorber between adjacent decks for the mitigation of pounding effect.
Pounding mitigation Expansion joint Seismic design Bridge Shock absorber Unseating prevention Restrainers.
Shehata E. Abdel Raheem T. Hayashikawa
Lecturer of Structural Engineering, Civil Engineering Department, Faculty of Engineering,,Assiut Uni Professor, Bridge and Structural Design Engineering, Graduate school of Engineering,Hokkaido Univers
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）