TY - GEN
T1 - Seismic responses of regular highway bridges under near-fault ground motions (COMPDYN 2017)
AU - Ma, Hai Bin
AU - Zhuo, Wei Dong
AU - Fiorentino, Gabriele
AU - Lavorato, Davide
AU - Nuti, Camillo
AU - Sun, Ying
PY - 2017
Y1 - 2017
N2 - Ground motions recorded in near-fault areas have some specific characteristics that differ substantially from those recorded in far-fault regions. One of the main features of near-fault records is the pulse-like shape caused by forward-directivity effect. This peculiarity may lead to much more severe damage to bridge structures located in near-fault regions. However, both current Chinese and European codes for seismic design of highway bridges nearly have no consideration on near-fault seismic actions. In this study, typical regular highway bridges in China are idealized as single-degree-of-freedom (SDOF) systems. Then, the Makris mathematical model for the pulse-like records is used to perform a parametric analysis on a settled SDOF system. Effect of key parameters, such as the half-pulse number (n), fundamental period (T0), pulse period (Tp) and the peak velocity (Vp) from the mathematical model, on responses of SDOF systems are analyzed. The potential degradation phenomenon which might happen under near-fault earthquake ground motions is also considered by comparing the ductility coefficient spectrum. The results show that all the key parameters had a significant effect on both linear and nonlinear response spectrum and seismic response. The stiffness degradation phenomenon will lead to a larger ductility coefficient and the Vp is the most effective factor for the response under the near-fault mathematical input.
AB - Ground motions recorded in near-fault areas have some specific characteristics that differ substantially from those recorded in far-fault regions. One of the main features of near-fault records is the pulse-like shape caused by forward-directivity effect. This peculiarity may lead to much more severe damage to bridge structures located in near-fault regions. However, both current Chinese and European codes for seismic design of highway bridges nearly have no consideration on near-fault seismic actions. In this study, typical regular highway bridges in China are idealized as single-degree-of-freedom (SDOF) systems. Then, the Makris mathematical model for the pulse-like records is used to perform a parametric analysis on a settled SDOF system. Effect of key parameters, such as the half-pulse number (n), fundamental period (T0), pulse period (Tp) and the peak velocity (Vp) from the mathematical model, on responses of SDOF systems are analyzed. The potential degradation phenomenon which might happen under near-fault earthquake ground motions is also considered by comparing the ductility coefficient spectrum. The results show that all the key parameters had a significant effect on both linear and nonlinear response spectrum and seismic response. The stiffness degradation phenomenon will lead to a larger ductility coefficient and the Vp is the most effective factor for the response under the near-fault mathematical input.
KW - Makris Model
KW - Near-fault
KW - Regular Highway Bridge
KW - SDOF
KW - Seismic Analysis
KW - Spectrum Analysis
UR - http://www.scopus.com/inward/record.url?scp=85042468134&partnerID=8YFLogxK
U2 - 10.7712/120117.5554.18034
DO - 10.7712/120117.5554.18034
M3 - Conference Contribution (Conference Proceeding)
AN - SCOPUS:85042468134
T3 - COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
SP - 2119
EP - 2137
BT - COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
A2 - Papadrakakis, M.
A2 - Fragiadakis, Michalis
PB - National Technical University of Athens
T2 - 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2017
Y2 - 15 June 2017 through 17 June 2017
ER -