Collapse capacity of reinforced concrete skewed bridges retrofitted with buckling-restrained braces

Wang, Yuandong; Ibarra, Luis; Pantelides, Chris P.

doi:10.1016/j.engstruct.2019.01.033

Cited by 33 publications

(7 citation statements)

References 33 publications

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“…Kaviani et al [40] proposed a detailed approach for modeling skew-angled seat-type abutments, considering a comprehensive variety of bridge configuration to identify trends in seismic behaviour of reinforced concrete bridges with seat-type abutments under earthquake loading, especially with respect to the abutment skew angle. Wang et al [41] assessed the collapse capacity and failure modes of skewed bridges retrofitted with BRBs at the column bent, obtaining the factors controlling the seismic performance Advances in Civil Engineering from a case study of a three-span reinforced concrete box girder skewed bridge with skew angles of 0°, 18°, 36°, and 54°. e stiffness and strength of backfill springs linearly increase with burial depth based on the definition in Greimann and Wolde-Tinsae [9] and ICHPD [32], calculated by the "p-y" method considering completely elasticplastic constitution of the soil.…”

Section: Skew Anglementioning

confidence: 99%

Investigation on Flooding‐Resistant Performance of Integral Abutment and Jointless Bridge

Easa

et al. 2020

Advances in Civil Engineering

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Bridge washouts connected to flood events are deemed one of the main reasons for structural collapse. Compared to traditional continuous jointed bridges, integral abutment and jointless bridges (IAJBs) have better lateral stability because there are no expansion devices. The mechanical performance of Shangban IAJ bridge, located in Fujian, China, is thoroughly investigated by Finite Element Analysis (FEA). The numerical model is created and validated based on experimental results obtained from static load tests performed on the bridge. A detailed parametric analysis is carried out to assess the correlation between the flood-resistant performance and a number of parameters: skew angle, water-blocking area, span number, pile section geometry, and abutment height. Except for the abutment height, other parameters significantly affect the bridge performance. Furthermore, the change in the span number has a meaningful impact only when fewer than four spans are modeled. Finally, pushover analyses estimate the maximum transverse displacement and the sequence of plastic hinge creation as well as the mechanical behaviour of the structure under lateral flood loads. The analysis results show that IAJBs have better flooding-resistant performance than conventional jointed bridges.

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Section: Skew Anglementioning

confidence: 99%

Investigation on Flooding‐Resistant Performance of Integral Abutment and Jointless Bridge

Easa

et al. 2020

Advances in Civil Engineering

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“…BRBs have relatively light weights, do not increase the mass and inertia forces of the bridge, and can be used as sacrificial elements to yield before detecting damage in other structural members. Therefore, previous experimental and analytical studies investigated the effectiveness of the BRB retrofit approach for the seismic upgrading of steel and concrete bridges with different structural systems [21][22][23]. It was concluded that the BRB retrofits reduced the probability of failure since they act as structural fuses that sustain demands and dissipate seismic energy through hysteretic behavior.…”

Section: Introductionmentioning

confidence: 99%

Seismic Fragility Assessment of an Existing Multi-Span RC Bridge Equipped with Risk Mitigation Systems

Ghazal

Mwafy

2022

Buildings

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The vulnerability of bridges and the effectiveness of suitable mitigation techniques in regions exposed to different seismic scenarios, while lacking reliable fragility assessment studies for existing bridge inventory, need focused attention. Further, while several retrofit techniques were proposed for improving the seismic performance of existing bridges, the limitations of such approaches need further investigation. Thus, this study assesses the seismic vulnerability of a benchmark structure representing pre-seismic code multi-span bridges in an earthquake-prone region before and after the retrofit to mitigate earthquake-related losses. The numerical modeling approaches of the selected bridge and retrofit systems were verified using the results of previous experimental studies. Detailed three-dimensional fiber-based (3DFB) simulation models were then developed to assess the seismic response of the benchmark bridge under the effects of diverse earthquake records representing far-field and near-source seismic scenarios in both longitudinal and transverse directions. The obtained results from several inelastic pushover analyses (IPAs) and incremental dynamic analyses (IDAs) confirmed the vulnerability of the benchmark bridge and the pressing need for mitigation actions to reduce the expected seismic losses under different seismic scenarios. Higher damage probabilities were observed under the effects of far-source events and at lower intensities than their near-field counterparts. Based on the probabilistic assessment study, it is concluded that retrofitting the bridge with buckling restrained braces (BRBs) is an effective mitigation measure to increase the lateral strength and overcome the high curvature ductility (CD) demands observed in bents, particularly under the most critical seismic scenario. The study provides insight into the impacts of contemporary retrofit techniques on improving the seismic performance of substandard bridges and presents a range of fragility functions for the assessment and mitigation of earthquake risks.

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“…Based on the OpenSees platform, a three-dimensional numerical model was established, and the nonlinear seismic response and seismic performance of the single-tower cable-stayed bridge were systematically studied. Recently, Wang et al [26,27] evaluated the potential benefits of using buckling-restrained braces (BRBs) to seismically rehabilitate straight bridges and assessed the collapse capacity and failure modes of skewed bridges retrofitted with buckling-restrained braces (BRBs) at the column bent.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the In Situ Spatially Varying Ground Motions and Nonlinear Seismic Response Analysis of the Cable-Stayed Bridge

Jin

Chen

et al. 2020

Shock and Vibration

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To study the nonlinear seismic behavior and seismic resistance of the long-span cable-stayed bridges subjected to earthquakes, the multidimensional and multisupported artificial ground motions are synthesized first based on the in situ site conditions of the bridge considering the coherent and traveling wave effects. Then, considering the material nonlinearity of the cable-stayed bridge, a 3D finite element model is established based on the OpenSees platform, and the nonlinear seismic response analysis of the bridge is carried out under the synthetic artificial ground motions. The nonlinear seismic response of main bridge components such as piers, towers, bearings, and cables is analyzed, and key conclusions and observations are drawn.

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Collapse capacity of reinforced concrete skewed bridges retrofitted with buckling-restrained braces

Cited by 33 publications

References 33 publications

Investigation on Flooding‐Resistant Performance of Integral Abutment and Jointless Bridge

Investigation on Flooding‐Resistant Performance of Integral Abutment and Jointless Bridge

Seismic Fragility Assessment of an Existing Multi-Span RC Bridge Equipped with Risk Mitigation Systems

Simulation of the In Situ Spatially Varying Ground Motions and Nonlinear Seismic Response Analysis of the Cable-Stayed Bridge

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