Evaluating Code Criteria for Regular Seismic Behavior of Continuous                    Concrete Box Girder Bridges with Unequal Height Piers

Guirguis, J. E. B.; Mehanny, S. S. F.

doi:10.1061/(asce)be.1943-5592.0000383

Cited by 58 publications

(18 citation statements)

References 10 publications

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“…More advanced nonlinear models were used to simulate the response of concrete linings of large rectangular embedded structures (e.g., subways); for example, the damage plasticity model proposed by Lubliner et al [106], used in [93], the plastic-damage constitutive model of Lee and Fenves [107], used in [86], etc. In some studies, the concrete constitutive models were accompanied by nonlinear models to simulate the response of steel reinforcement, e.g., a bilinear relationship with alterative isotropic hardening, proposed by Guirguis and Mehanny [108], was applied in [93].…”

Section: Numerical Codes and Constitutive Models Used In Analytical S...mentioning

confidence: 99%

Developments in Seismic Vulnerability Assessment of Tunnels and Underground Structures

et al. 2022

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Underground structures are being constructed at an increasing rate in seismic prone areas, to facilitate the expanding needs of societies. Considering the vital role of this infrastructure in densely populated urban areas and interurban transportation networks, as well as the significant losses associated with potential seismically induced damage, its assessment against seismic hazard is of great importance for stakeholders, operators, and governmental bodies. This paper presents a state-of-the-art review of current developments in the assessment of seismic vulnerability of tunnels and underground structures. Methods for the development of fragility functions for the assessment of bored tunnels in rock or alluvial, and cut and cover tunnels and subways in alluvial, against ground seismic shaking and earthquake-induced ground failures are presented. Emphasis is placed on the estimation of the capacity of the examined structures, the selection of appropriate intensity measures to express seismic intensity, the development of rational probabilistic seismic demand models and the estimation of epistemic and aleatoric uncertainties, related to the seismic fragility of underground structures. Through the discussion, acknowledged gaps in the relevant literature are highlighted.

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Section: Numerical Codes and Constitutive Models Used In Analytical S...mentioning

confidence: 99%

Developments in Seismic Vulnerability Assessment of Tunnels and Underground Structures

et al. 2022

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“…As shown in Figure 3d, the cross section is divided into cover concrete fibers, core concrete fibers, and longitudinal steel fibers, based on the confinement condition and material properties. Giuffré‐Menegotto‐Pinto model 25 and Kent‐Scott‐Park model 26 are utilized simulating the constitutive relationships of steel and concrete materials, respectively, as plotted in Figure 3e,f.…”

Section: Bridge Prototype and Numerical Modelmentioning

confidence: 99%

Seismic assessment of earthquake‐resilient tall pier bridges using rocking foundation retrofitted with various energy dissipation devices

2020

Struct Control Health Monit

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While conventional seismic isolation bearings are usually inefficient for bridges with tall piers, rocking foundation is a promising approach mitigating their seismic demands and improving post-earthquake resilience. However, excessive tilt angle might occur at rocking interface and lead to overturning during strong earthquake excitations. This paper investigates the efficiency of various energy dissipation devices in improving the seismic performance of rocking foundations employed in tall pier bridge systems. The devices

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“…[1][2], and the second case study bridge is a four-span bridge (Figs. 3-4), with spans 40.0+50.0+50.0+40.0, and both are simply supported by two abutments at both ends, which allows for free sliding and rotation about both horizontal axes.…”

Section: Monolithic-type Bridge Modelingmentioning

confidence: 99%

“…One of the challenges associated with Eurocode 8 is to synchronize the failure of irregular bridges with unequal pier heights, which is not effectively addressed by code committees. Despite the recognized advantages of codes criteria for regularity of bridges, review of literature on seismic behavior of bridges with unequal pier height reveals that the codes criteria may somehow guarantee simultaneous failure, but not for low ratio of pier height especially for ratios lower than 0.5 [1]. This is one of the challenging areas that this research project seeks to address in order to verify the codes.…”

Section: Introductionmentioning

confidence: 98%

Design of Bridges with Unequal Pier Heights

Mohammadi-Tamanani¹,

Gian²,

Ayoub³

2014

Structures Congress 2014

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One of the challenges associated with AASHTO-LRFD and Eurocode 8 is predicting the failure of irregular bridges supported by piers of unequal heights, which is not effectively addressed by codes committee. EC8 currently uses "moment demand-tomoment capacity" ratios to somewhat guarantee simultaneous failure of piers on bridges, while AASHTO-LRFD relies on the relative effective stiffness of the piers. These conditions are not entirely valid, in particular for piers with a relative height of 0.5 or less, where a possible combination of flexure and shear failure mode may occur. In this case, the shorter piers often result in brittle shear failure, while the longer piers are most likely to fail due to flexure, creating a combination of different failure modes experienced by the bridge.To evaluate the adequacy of EC8 and AASHTO-LRFD design procedures for regular seismic behavior, various irregular bridges will be simulated through a non-linear pushover analysis using shear-critical fiber-based beam-column elements. The research will investigate the behavior of irregular monolithic and bearing-type bridges experiencing different failure modes, and investigate different ways of regularizing the bridge performance to balance damage. The ultimate aim is to obtain a simultaneous or near-simultaneous failure of all unequal piers irrespective of the different heights and failure mode experienced.

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Evaluating Code Criteria for Regular Seismic Behavior of Continuous Concrete Box Girder Bridges with Unequal Height Piers

Cited by 58 publications

References 10 publications

Developments in Seismic Vulnerability Assessment of Tunnels and Underground Structures

Developments in Seismic Vulnerability Assessment of Tunnels and Underground Structures

Seismic assessment of earthquake‐resilient tall pier bridges using rocking foundation retrofitted with various energy dissipation devices

Design of Bridges with Unequal Pier Heights

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