Effect of V-shape canyon topography on seismic response of deep-water rigid-frame bridge based on simulated ground motions

Zhang, Jiarui; Wei, Kai; Gao, Libao; Qin, Shunquan

doi:10.1016/j.istruc.2021.05.002

Cited by 20 publications

(3 citation statements)

References 34 publications

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“…The seismic fragility and damage of the asbuilt and retrofitted old and newly designed multi-span CRFBs (Jung and Andrawes 2018;Abbasi and Moustafa 2019) and the irregular bridges with non-circular tall piers considering ground motion directionality were assessed (Shan et al 2020). The seismic fragility of the offshore (Liang et al 2020), sea-crossing (Zhang et al 2021a) and deep-water CRFBs (Zhang et al 2021b) were evaluated.…”

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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“…Zhou et al 19 used the finite element method to obtain the seismic response of the multi-supported continuous rigid frame bridge under incident SV waves, and the results showed that the canyon topography enhanced the response of the bridge. Zhang et al 20 revealed the enhancement effect of a V-shaped canyon on seismic fragility of deep-water rigid-frame bridges by F I G U R E 1 Two-dimensional model of a simply supported bridge crossing a V-shaped canyon in an elastic half-space. using a hybrid spectral element and finite element method.…”

Section: Introductionmentioning

confidence: 99%

Effect of a V‐shaped canyon on the seismic response of a bridge under oblique incident SH waves

Zhang,

Wang,

Zhang

et al. 2023

Earthq Engng Struct Dyn

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To elucidate the effect of canyon topography on dynamic response of a bridge, an analytical model for a simply supported bridge crossing a symmetric or non‐symmetric V‐shaped canyon in an elastic half‐space under SH waves is proposed. An exact solution to the dynamic canyon‐bridge interaction problem is derived using wave function expansion and verified by its comparison with past exact solution for a sole bridge model without a canyon. The wave propagation in the half‐space, wave scattering by the canyon and wave radiation from the bridge are all taken into account rigorously. Through a systematical parametrical study, it is found that the seismic response of the bridge beam and the wave‐facing side foundation will be significantly amplified. The degree of the topographic amplification is closely related to the geometry of the canyon, the mass and the stiffness of the bridge beam, and the frequency content and angle of the incident wave. The potential adverse effects of a V‐shaped canyon on a bridge should be considered in its seismic design.

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“…These are effective ways to eliminate safety hazards and avoid disasters and accidents. Analyzing the non-linear seismic response (NSR) of structures from these accidents has always been a focus of attention in the engineering community [4][5][6]. In in-depth research, estimating the seismic response of structures through relevant computational simulation tools is a good research method.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of structural nonlinear seismic response

Qin

2023

Int. J. Simul. Multidisci. Des. Optim.

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Faced with the difficulty of analyzing structural nonlinear seismic response, this study focuses on the reinforced concrete frame structure and designs a frame that meets the specifications. Artificial synthetic seismic records and natural seismic records were selected, and the acceleration response of the first story of the structure was used as the output sample for the study. On the basis of a nonlinear autoregressive moving average model with external inputs, a neural network model was constructed and nonlinear seismic response simulation analysis was conducted. These results confirm that the research method has good predictive performance and can effectively predict structural nonlinear seismic response. Under the action of artificial earthquake records, there is a small difference between them and the acceleration time history curve and acceleration response peak obtained from time history analysis. Under the action of artificial seismic record ACC12, when the time is 25 s, the calculation results of time history analysis and research methods are 1.715 m/s2 and 1.403 m/s2, respectively, with the former being 0.312 m/s2 smaller than the latter. In natural earthquake records, with a characteristic period of 0.30 s, under the action of natural earthquake record USA00668, the relative energy of time history analysis is 4.997 m2/s when the time is 30 s, which is 0.938 m2/s higher than the research method. The research method can accurately analyze the nonlinear seismic response of the results.

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Effect of V-shape canyon topography on seismic response of deep-water rigid-frame bridge based on simulated ground motions

Cited by 20 publications

References 34 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

Effect of a V‐shaped canyon on the seismic response of a bridge under oblique incident SH waves

Simulation analysis of structural nonlinear seismic response

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