Parametric study of topographic effect on train-bridge interaction of a continuous rigid frame bridge during earthquakes

Qiao, Hong; Dai, Zuhao; Du, Xianting; Wang, Chenyu; Long, Peiheng; Jiao, Chiyu

doi:10.1007/s10518-022-01532-7

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…It is worth mentioning that seismic responses of deep-water CRFBs have attracted attention since the underwater crack occurred in the main pier of the Miaoziping Bridge (Wei et al 2022). Qiao et al (2022) conducted an in-depth parametric study of topographic effect on the seismic response and running safety of a train-bridge coupled system on a CRFB. Park et al (2004), Ucak et al (2014) and Yang et al (2021) presented seismic response study of ordinary and isolated bridges crossing strikeslip fault rupture zones by utilizing finite element models of the 10-span Bolu Viaduct.…”

Section: Introductionmentioning

confidence: 99%

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

2023

Bull Earthquake Eng

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Continuous rigid-frame bridge (CRFB) is widely constructed in western China with high seismicity areas. To investigate the seismic response characteristics and whiplash effect mechanism of CRFBs under near-fault ground motions, this study selects a long-span CRFB with high piers as the prototype bridge and develops the nonlinear finite element model based on OpenSees. In this work, three groups of near-fault ground motions having forward directivity pulse, fling-step pulse and non-pulse are selected as seismic inputs. These records are intercepted using significant duration index and scaled to 0.2 g, 0.4 g, and 0.64 g, representing basic ground motions, frequent ground motions and rare ground motions, respectively. The study analyzes the seismic response characteristics of CRFBs and discusses the effects of bearing constraints, ground motion components and vertical excitations on the seismic responses. The numerical results show that the longitudinal vibration, transverse whiplash effect and vertical uplift behavior of main girder are main deformation characteristics of CRFBs. Compared with non-pulse earthquakes, the structural displacements, lateral drift angles, bearing deformations, internal forces and pounding effects all significantly increase under pulse-like earthquakes. There are spatial torsional effects in mid-span girder and main piers and pounding effects between girder ends and transition pier top. The perfectly-free and fixed bearings in transverse direction are not recommended for the seismic design of CRFBs. An optimal stiffness ratio in friction pendulum systems may exist that can minimize bending degree of the main girder. Furthermore, the side-span girder under pure longitudinal excitations can uplift that is closely  Long-He Xu

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Section: Introductionmentioning

confidence: 99%

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

2023

Bull Earthquake Eng

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“…Ma et al [21] and Gong [22] investigated the influence of spatial variation on the dynamic performance of a train passing through a bridge and pointed out that the wave passage effect and incoherence effect should not be disregarded in this context, and the tri-directional spatially correlated ground motions may underestimate the random response and running safety. Qiao et al [23,24] examined the impact of topographic effects on the seismic response of train-bridge systems and found that topography and the incident angle of seismic waves have a significant influence on the system's seismic response. Chen et al [25,26], Zhou et al [27], and Yu et al [28] investigated the dynamic response of train-track-bridge coupling systems under the influence of pulse parameters from near-fault pulse-type earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Train–Bridge Coupling System for a Long-Span Railway Suspension Bridge Subjected to Strike–Slip Fault

Chen,

Kang,

Yang

et al. 2023

Applied Sciences

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Long-span railway bridges crossing active faults are more vulnerable owing to the joint combination of pulse ground motions and surface dislocation. To study the dynamic effects resulting from the coupling of long-span railway suspension bridges crossing strike–slip fault and trains, a nonlinear model in which wheel–rail contact was established based on Hertz’s nonlinear theory and Kalker creep theory. To generate the ground motions across strike–slip fault, an artificial synthetic method, which considers both the fling-step effect with a single pulse and the directivity effect with multiple pulses, is employed. The effects of fault-crossing angles (FCAs) and permanent ground rupture displacements (PGRDs) are systematically investigated based on wheel–rail dynamic (derailment coefficient, lateral wheel–rail force, and wheel–load reduction rate). Conclusions are drawn and can be applied in the practical seismic design and train running safety assessment of long-span railway suspension bridges crossing strike–slip fault.

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“…Researchers evaluated the seismic fragility of multi-span CRFBs (Jung and Andrawes 2018;Abbasi and Moustafa 2019;Liang et al 2020;Shan et al 2020), conducted a parametric analysis of trainbridge interactions (Qiao et al 2023). Additionally, researchers have developed novel structural systems (Peng and Zhang 2020;Lin et al 2020c) and assessed the seismic response of ordinary and isolated CRFBs crossing strike-slip fault rupture zones (Ucak et al 2014;Yang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Characteristics and Performance Improvement of Near-Fault Continuous Rigid-Frame Bridges

2023

Preprint

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In recent years, increasing attention has focused on seismic performance of long-span continuous rigid-frame bridges (CRFBs) under near-fault earthquake excitations. To investigate the characteristics of near-fault seismic response of CRFBs and evaluate the effectiveness of a hybrid seismic control system (HSCS), this study establishes 22 uncontrolled models and 22 controlled models varying in span and pier height. A comprehensive seismic evaluation method based on a fuzzy logic control (FLC) algorithm is proposed. Transverse whiplash and spatial torsion effects of the uncontrolled and controlled models are analyzed comparatively. Control performance of HSCS is evaluated and parametric study is conducted to investigate the effect of friction, damping, and ground motion on seismic response of HSCS-controlled CRFB. The results indicate that, in practical applications, the transverse whiplash and spatial torsion effects of CRFBs should be considered, particularly in multi-span CRFBs with unequal-height piers. The span and pier height have significant impact on these two effects and the corresponding girder end displacement, girder base, and pier bottom moment. Controlled bridges exhibit lower levels of these responses compared to uncontrolled bridges, and the displacement and bending moment are markedly reduced at a high control ratio of 0.4. Parametric analysis results show that the HSCS provides excellent seismic control performance for near-fault CRFBs when the optimum parameter values are used. This study may provide a useful reference for the seismic design and performance improvement of near-fault CRFBs.

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Parametric study of topographic effect on train-bridge interaction of a continuous rigid frame bridge during earthquakes

Cited by 9 publications

References 32 publications

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

Seismic response characteristics and whiplash effect mechanism of continuous rigid-frame bridges subjected to near-fault ground motions

Dynamic Analysis of Train–Bridge Coupling System for a Long-Span Railway Suspension Bridge Subjected to Strike–Slip Fault

Seismic Response Characteristics and Performance Improvement of Near-Fault Continuous Rigid-Frame Bridges

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