Higher-order mode effects on the seismic performance of tall piers
Zhongguo GUAN, Jianzhong LI, Yan XU, Hao LU
Higher-order mode effects on the seismic performance of tall piers
A comprehensive analysis was conducted to investigate the seismic performance of a typical tall bridge pier through incremental dynamical analysis (IDA). The effect of higher-order modes was studied specifically. The results showed that higher-order modes significantly contributed to the structural seismic response and should not be neglected. Including these modes resulted in an additional hinge midway up the pier. No plastic hinge would occur at this location for conventional bridge piers. Higher-order modes also led to an out-of-phase response between the hinge rotation at the pier bottom and the displacement at the top. This means that the displacement-based seismic design method cannot correctly predict the mechanical state of the critical hinge and therefore is not suitable for use in the seismic design of tall piers. Mistakenly using the displacement-based seismic design method for tall piers may result in a seriously unsafe condition.
tall bridges / higher-order mode effects / incremental dynamic analysis
[1] |
Kowalsky M J. Deformation limit states for circular reinforced concrete bridge column. Journal of Structural Engineering, 2000, 126(8): 869-878
CrossRef
Google scholar
|
[2] |
Priestley M J N, Seible F, Calvi M. Seismic Design and Retrofit of Bridges. New York: John Wiley & Sons, 1996
|
[3] |
JTG/T B02-01-2008. Guidelines for Seismic Design of Highway Bridges. Beijing: China Communications Press, 2008 (in Chinese)
|
[4] |
AASHTO. AASHTO Guide Specification for LRFD Seismic Bridge Design, 2007
|
[5] |
Ceravolo R, Demarie G V, Giordano L, Mancini G, Sabia D. Problems in applying code-specified capacity design procedures to seismic design of tall piers. Engineering Structures, 2009, 31(8): 1811-1821
CrossRef
Google scholar
|
[6] |
Li J Z, Song X D, Fan L C. Investigation for displacement ductility capacity of tall piers. Earthquake Engineering and Engineering Vibration, 2005, 25(1): 43-48 (in Chinese)
|
[7] |
Taucer F F, Enrico S F. Beam-column Model for Seismic Response Analysis of Reinforced Concrete Structures. <patent>EERC 91-17</patent>, 1991
|
[8] |
Vamvatsikos D, Cornell C A. Incremental dynamic analysis. Earthquake Engineering & Structural Dynamics, 2002, 31(3): 491-514
CrossRef
Google scholar
|
/
〈 | 〉 |