Influence of Bidirectional Near-Fault Excitations on RC Bridge Piers

Sengupta, Arghya; Quadery, Lutfulla; Sarkar, Shamik; Roy, Rana

doi:10.1061/(asce)be.1943-5592.0000836

Cited by 37 publications

(14 citation statements)

References 55 publications

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“…In general, the ultimate ductility is considerably lower in columns under bidirectional loading and this effect is more prominent in rectangular columns (50% to 75% lower in the weak direction and approximately 35% lower in the strong direction). Similarly, in a numerical study, Sengupta et al [30], found that bidirectional loading can amplify the response in the short period systems up to 30% for ground motions records with forward directivity characteristics and as high as 50% for stiff systems under fling pulses ground motions.…”

Section: Research Backgroundmentioning

confidence: 83%

“…However, all the above-mentioned studies used 2D structural models excited under unidirectional loading, which is in contradiction with the bidirectional nature of ground motions and 3D geometry of buildings. The bidirectional load interaction leads to increased elongation of the structural period and pronounced increase in bond-slip and shear displacement [30] which is more severe for short-period structures. Damage accumulation under mainshock and aftershock can be increased significantly under bidirectional loading in particular for stiff systems.…”

Section: Research Backgroundmentioning

confidence: 99%

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Fragility analysis of rectangular and circular reinforced concrete columns under bidirectional multiple excitations

Salami

Dizaj

Kashani

2021

Engineering Structures

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Section: Research Backgroundmentioning

confidence: 83%

Section: Research Backgroundmentioning

confidence: 99%

Fragility analysis of rectangular and circular reinforced concrete columns under bidirectional multiple excitations

Salami

Dizaj

Kashani

2021

Engineering Structures

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“…16,18 As Kalker's linear creep theory is only appropriate for small shrimps, nonlinear modifications were carried out for large shrimps with Shen-Hedrick-Elkins Model. 13,19 A simplified interactive approach is introduced here for the nonlinear seismic study of the LRVRCV system, and equation ( 4) is rewritten as equation (5). P rb and P rv can be substituted by the normal and tangential direction wheel-rail relationships.…”

Section: Vehicle-bridge Coupled System Modelsmentioning

confidence: 99%

“…4 Many experiments on NF earthquakes' influences on bridges indicate the elastic and plastic responses in NF earthquakes from pillars with less hysteretic loops and more significant envelopes of energy. [5][6][7][8][9] The pier-top changes triggered by NF earthquakes are at a design stage of simple earthquakes 30 percent higher than those induced by FFGM. 10 Even with moderate seismic intensities, bridge-crossing events' safety can be compromised by small displacements for railway bridges.…”

Section: Introductionmentioning

confidence: 99%

A simplified iterative approach for testing the pulse derailment of light rail vehicles across a viaduct to near-fault earthquake scenarios

Chen

Liu

Zhu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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Near-fault (NF) earthquakes cause severe bridge damage, particularly urban bridges subjected to light rail transit (LRT), which could affect the safety of the light rail transit vehicle (“light rail vehicle” or “LRV” for short). Now when a variety of studies on the fault fracture effect on the working protection of LRVs are available for the study of cars subjected to far-reaching soil motion (FFGMs), further examination is appropriate. For the first time, this paper introduced the LRV derailment mechanism caused by pulse-type near-fault ground motions (NFGMs), suggesting the concept of pulse derailment. The effects of near-fault ground motions (NFGMs) are included in an available numerical process developed for the LRV analysis of the VBI system. A simplified iterative algorithm is proposed to assess the stability and nonlinear seismic response of an LRV-reinforced concrete (RC) viaduct (LRVBRCV) system to a long-period NFGMs using the dynamic substructure method (DSM). Furthermore, a computer simulation software was developed to compute the nonlinear seismic responses of the VBI system to pulse-type NFGMs, non-pulse-type NFGMs, and FFGMs named Dynamic Interaction Analysis for Light-Rail-Vehicle Bridge System (DIALRVBS). The nonlinear bridge seismic reaction determines the impact of pulses on lateral peak earth acceleration (Ap) and lateral peak land (Vp) ratios. The analysis results quantify the effects of pulse-type NFGMs seismic responses on the LRV operations' safety. In contrast with the pulse-type non-pulse NFGMs and FFGMs, this article's research shows that pulse-type NFGM derail trains primarily via the transverse velocity pulse effect. Hence, this study's results and the proposed method can improve the LRT bridges' seismic designs.

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“…The influence of bidirectional shaking is accounted for by using a simplified 30% rule. Bidirectional interaction under near-fault motion is observed to substantially amplify damage, particularly for a stiff system [12]. Sehhati et al studied the effect of near-fault ground motions on the multi-story structures.…”

Section: Introductionmentioning

confidence: 99%

Identification and Representation of Multi-Pulse Near-Fault Strong Ground Motion Using Adaptive Wavelet Transform

Chunxu

2019

Applied Sciences

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In order to identify the horizontal seismic motion owning the largest pulse energy, and represent the dominant pulse-like component embedded in this seismic motion, we used the adaptive wavelet transform algorithm in this paper. Fifteen candidate mother wavelets were evaluated to select the optimum wavelet based on the similarities between the candidate mother wavelet and the target seismic motion, evaluated by the minimum cross variance. This adaptive choosing algorithm for the optimum mother wavelet was invoked before identifying both the horizontal direction owning the largest pulse energy and every dominant pulse, which provides the optimum mother wavelet for the continuous wavelet transform. Each dominant pulse can be represented by its adaptively selected optimum mother wavelet. The results indicate that the identified multi-pulse component fits well with the seismic motion. In most cases, mother wavelets in one multi-pulse seismic motion were different from each other. For the Chi-Chi event (1999-Sep-20 17:47:16 UTC, Mw = 7.6), 62.26% of the qualified pulse-like earthquake motions lay in the horizontal direction ranging from ±15° to ±75°. The Daubechies 6 (db6) mother wavelet was the most frequently used type for both the first and second pulse components.

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Influence of Bidirectional Near-Fault Excitations on RC Bridge Piers

Cited by 37 publications

References 55 publications

Fragility analysis of rectangular and circular reinforced concrete columns under bidirectional multiple excitations

Fragility analysis of rectangular and circular reinforced concrete columns under bidirectional multiple excitations

A simplified iterative approach for testing the pulse derailment of light rail vehicles across a viaduct to near-fault earthquake scenarios

Identification and Representation of Multi-Pulse Near-Fault Strong Ground Motion Using Adaptive Wavelet Transform

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