Numerical study of the seismic performance and damage mitigation of steel–concrete composite rigid-frame bridge subjected to across-fault ground motions

Lin, Yuanzheng; Zong, Zhouhong; Bi, Kaiming; Hao, Hong; Lin, Jianwen; Chen, Yiyan

doi:10.1007/s10518-020-00958-1

Cited by 29 publications

(7 citation statements)

References 43 publications

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“…Both the smaller horizontal acceleration component and the vertical component are scaled with the same longitudinal scaling factor and inputted in y direction and z direction, respectively. It should be noted that this scaling principle only amplify or reduce the acceleration amplitude, other characteristics, such as duration, frequency spectrum and velocity pulse effect, are not changed after the scaling (Lin et al 2020a). Furthermore, the 5-95% significant duration index (Ds5-95%) related to Arias Intensity (AI) is adopted to consider the effective duration effect of all ground motions (Shi et al 2022).…”

Section: Selected Ground Motion Recordsmentioning

confidence: 99%

“…The post-earthquake investigation and research show that the rupture forward directivity effect and fling-step effect of the faults are significant factors leading to structural damage (Kim et al 2011;Kawashima et al 2011;Xiang et al 2019;Todorov and Billah 2021). These effects make near-fault ground motions have strong velocity and displacement pulses, which are obviously different from far-field ground motions in amplitude, frequency spectrum and duration (Bray and Rodriguez-Marek 2004;Mavroeidis and Papageorgiou 2010;Lin et al 2020a).…”

Section: Introductionmentioning

confidence: 99%

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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: Selected Ground Motion Recordsmentioning

confidence: 99%

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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“…In order to ensure the convergence and accuracy, the hexahedral mesh and structured mesh technology were divided to obtain better calculation accuracy and reduce the calculation workload. A sensitivity analysis showed that, considering the calculation efficiency and accuracy, the overall mesh density of steel pipe, concrete, and ground beam is 20 mm, the key parts (the connection between the energy dissipator and the steel pipe) are 10 mm, and the mesh density of energy the dissipating elements is 1 mm [ 29 ]. The finite model is shown in Figure 6 .…”

Section: Numerical Simulation and Experimental Verification Of Segmen...mentioning

confidence: 99%

Numerical Investigation of the Performance of Segmental CFST Piers with External Energy Dissipators under Lateral Cyclic Loadings

Wang

Yu-jie

et al. 2022

Materials

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In order to improve the construction efficiency of piers and reduce the local damage of piers, concrete-filled steel tubes (CFST) are used to precast pier segments. Aiming at the problems of the poor integrity and insufficient energy dissipation capacity of dry joint segmental assembled piers, segmental assembled concrete-filled steel tubular piers with external replaceable energy dissipators are being developed. Based on the low cyclic test of a segmental assembled CFST pier, the finite element numerical simulation model of a CFST pier is established based on ABAQUS software, and the validity of the numerical model is verified by the experimental results. The effects of the section ratio, axial compression ratio, and initial prestress on the seismic performance of piers are studied through a pseudostatic analysis. The results show that an increase in the section ratio can improve the lateral bearing capacity and energy dissipation capacity of the pier. When the section ratio is increased to 4%, the energy dissipation capacity of a CFST pier is increased by 77.8% and the lateral bearing capacity is increased by 33.9% compared with a section ratio of 2%, but the residual displacement of the pier top also increases. With an increase in the axial compression ratio, the energy dissipation capacity of the pier is significantly improved; when the axial compression ratio is increased to 0.30, the energy dissipation capacity of CFST piers is increased by 27.5% compared with a section ratio of 0.05, the residual displacement of the pier top is reduced, and the self-resetting effect of the pier is improved. A change in the initial prestress has no effect on the energy dissipation capacity of piers. Finally, based on an analysis of mechanical theory, a formula of bending capacity suitable for this type of pier is proposed, and the error is within 10%.

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“…permanent displacement) can be found in the velocity and displacement time histories, respectively (Abrahamson, 2001). Due to the different rupture mechanisms, these two types of pulse can induce different structural responses, and some researchers discussed the influences of both types of pulses on the seismic responses of buildings (Bhagat et al, 2021; Li et al, 2021; Vafaei and Eskandari, 2015), continuous bridges (Cao and Li, 2022; Chen and Li, 2021), concrete-filled steel tubular arch bridges (Xin et al, 2019), steel-concrete composite rigid-frame bridges (Lin et al, 2020a; 2020b), cable-stayed bridges (Li et al, 2017), intake tower structures (Chen et al, 2020), etc. However, to the authors' best knowledge, no open literature explicitly discusses the impact of different types of N-F pulse on the seismic responses of segmental columns-supported bridges.…”

Section: Introductionmentioning

confidence: 99%

Numerical studies on the seismic responses of precast segmental columns-supported bridge structures subjected to near-fault ground motions

Dong

et al. 2022

Advances in Structural Engineering

Self Cite

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Precast segmental columns have attracted wide attentions in bridge construction industry recently due to its ability to accelerate construction speed, improve construction quality and reduce environmental impact. It is of great practical importance to study the seismic performances of segmental columns, and many experimental and numerical studies have been performed. However, most previous studies focused on segmental column itself, the research on the seismic performance of a whole bridge structure supported by precast segmental columns is very limited. In particular, no systematic studies have been performed to investigate the seismic performances of segmental columns-supported bridges subjected to near-fault (N-F) ground motions (GMs). To bridge this research gap, the seismic responses of three bridge structures (i.e. a segmental columns-supported bridge, a bridge supported by segmental columns with internal energy dissipation bars, and a conventional bridge supported by monolithic columns) subjected to four types of earthquake ground motions (i.e. a N-F GM with fling-step (F-S) effect, a N-F GM with forward-directivity (F-D) effect, a non-pulse-like N-F GM, and a typical far-field (F-F) GM are investigated and compared in the present study based on the validated numerical models developed in ABAQUS. The influences of permanent ground displacement in the F-S ground motion and pulse period are also systematically investigated. The numerical results demonstrate that the permanent ground displacement in the N-F ground motions has very different effects on the segmental-columns supported bridge and monolithic columns supported bridge.

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Numerical study of the seismic performance and damage mitigation of steel–concrete composite rigid-frame bridge subjected to across-fault ground motions

Cited by 29 publications

References 43 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

Numerical Investigation of the Performance of Segmental CFST Piers with External Energy Dissipators under Lateral Cyclic Loadings

Numerical studies on the seismic responses of precast segmental columns-supported bridge structures subjected to near-fault ground motions

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