Comparison of dynamic response of isolated and non-isolated continuous girder bridges subjected to near-fault ground motions

Liao, Wei-Hsin; Loh, Chin‐Hsiung; Lee, Bor-Han

doi:10.1016/j.engstruct.2004.07.016

Cited by 118 publications

(54 citation statements)

References 9 publications

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“…Liao first point out that PGV/PGA>0.2 can be a representative character of the NF pulse-like records [19]. However, in Makris model the PGV/PGA ratio can be obtained as function of T p as described in Eq.14.…”

Section: (3) Pulse Period Effect (T P )mentioning

confidence: 99%

Seismic Responses of Regular Highway Bridges Under Near-Fault Ground Motions

Hai¹,

Zhuo²,

Fiorentino³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Section: (3) Pulse Period Effect (T P )mentioning

confidence: 99%

Seismic Responses of Regular Highway Bridges Under Near-Fault Ground Motions

Hai¹,

Zhuo²,

Fiorentino³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…These pulses are strongly influenced by the orientation of the fault, the direction of slip on the fault and the location of the recording station relative to the fault, which is termed as "directivity effect" due to the propagation of the rupture toward the recording site (Agrawal and He, 2002;Somerville, 2003;Megawati et al, 2001;Wang et al, 2002). The velocity pulse duration in the near-fault ground motions is larger than 1.0 s. In addition, the ratio of the peak ground velocity (PGV) to the peak ground acceleration (PGA) of the near-fault ground motions is larger than 0.1 s. The ground motions having these characteristics expose the structure to high input energy in the beginning of the earthquake (Liao et al, 2004) and cause large structural responses. Therefore, structural response to nearfault ground motions has received much attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, structural response to nearfault ground motions has received much attention in recent years. So far, dynamic response analyses of some structures subjected to near-fault ground motions have been performed (Liao et al, 2004;Hall et al, 1995;Malhotra, 1999;Chopra and Chintanapakdee, 2001). In these studies, it is seen that long period structures such as frame buildings and bridges experience a higher dynamic response when they are subjected to near-fault ground motion.…”

Section: Introductionmentioning

confidence: 99%

“…studies (Megawati et al, 2001;Liao et al, 2004;Chopra and Chintanapakdee, 2001;Bertero et al, 1978;Hall et al, 1995;Corigliano et al, 2006;Özturk, 2006;Dicleli and Buddaram, 2007;Liao et al, 2001;Bayraktar et al, 2008). Megawati et al (2001) derived the ground motions at the piers from the vibration records of the towers to discuss the possibility of the rupture in the step-over by examining these ground motions.…”

Section: Introductionmentioning

confidence: 99%

“…Megawati et al (2001) derived the ground motions at the piers from the vibration records of the towers to discuss the possibility of the rupture in the step-over by examining these ground motions. Liao et al (2004) studied the dynamic behavior of a five-span concrete pier bridge subjected to both near-fault and far-field ground motions. Liao et al (2001) investigated the dynamic response of seismic isolated continuous girder bridges subjected to either near-fault or far-field ground motions as compared to the non-isolated ones.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probabilistic sensitivity analysis of two suspension bridges in Istanbul, Turkey to near- and far-fault ground motion

Çavdar¹

2012

Nat. Hazards Earth Syst. Sci.

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Abstract. The aim of this paper is to compare the near-fault and far-fault ground motion effects on the probabilistic sensitivity dynamic responses of two suspension bridges in Istanbul. Two different types of suspension bridges are selected to investigate the near-fault (NF) and far-fault (FF) ground motion effects on the bridge sensitivity responses. NF and FF strong ground motion records, which have approximately identical peak ground accelerations, of the Kocaeli (1999) earthquake are selected for the analyses. Displacements and internal forces are determined using the probabilistic sensitivity method (PSM), which is one type of stochastic finite element method. The efficiency and accuracy of the proposed algorithm are validated by comparison with results of the Monte Carlo Simulation (MCS) method. The displacements and internal forces obtained from the analyses of suspension bridges subjected to each fault effect are compared with each other. It is clearly seen that there is more seismic demand on displacements and internal forces when suspension bridges are subjected to NF and FF ground motion.

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Seismic performance of bridges with novel SMA cable‐restrained high damping rubber bearings against near‐fault ground motions

Fang

Liang

Zheng

et al. 2021

Earthq Engng Struct Dyn

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This study presents a novel type of shape memory alloy (SMA) cable-restrained high damping rubber (SMA-HDR) bearing, which is particularly suited to nearfault (NF) regions where the pulsing effect potentially exists in the ground motions. The working mechanism of the bearing is first described, followed by an experimental investigation on a full-scale SMA-HDR bearing specimen. The test results confirm the efficient restraining effect offered by the SMA cables, which contribute to 65% and 24.4% of the lateral load resistance and total energy dissipation, respectively, prior to the initial fracture of the SMA cables. The failure of the cables is initiated near the end grip where moderate stress concentration exists at this region. Following the experimental study, the numerical modeling strategy for the bearing is discussed, and a case study is then presented, demonstrating the application of the SMA-HDR bearings in the Datianba #2 highway bridge, a real project that first adopts the proposed bearings in the world. A simplified design process is introduced for the bridge with novel SMA-HDR bearings to mitigate the potential damage during strong earthquakes especially the NF ones. The system-level analysis on the prototype bridge shows that the novel SMA-HDR bearings equipped with ten 7×7×1.2 SMA cables in each bearing could reduce the average maximum bearing displacement (MBD) by nearly 30% compared with the conventional bridge with HDR bearings. The application of the novel SMA-HDR bearing can significantly alleviate the pounding effect, especially under the NF earthquakes. The presence of the SMA cables tends to increase the maximum force response of the piers, but this effect is minor and under control.

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Comparison of dynamic response of isolated and non-isolated continuous girder bridges subjected to near-fault ground motions

Cited by 118 publications

References 9 publications

Seismic Responses of Regular Highway Bridges Under Near-Fault Ground Motions

Seismic Responses of Regular Highway Bridges Under Near-Fault Ground Motions

Probabilistic sensitivity analysis of two suspension bridges in Istanbul, Turkey to near- and far-fault ground motion

Seismic performance of bridges with novel SMA cable‐restrained high damping rubber bearings against near‐fault ground motions

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