Soil-structure interaction effects in analysis of seismic fragility of bridges using an intensity-based ground motion selection procedure

Paraskevopoulos, Elias; Sextos, Anastasios; Kotsoglou, Anastasios; Lesgidis, Nikolaos; Kappos, Andreas J.

doi:10.1016/j.engstruct.2017.08.033

Cited by 79 publications

(31 citation statements)

References 40 publications

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“…For anything more than this length, lateral displacements and bending moments are about four percent of those at the pile head. If a pile is longer than , the pile would seem to be infinitely long [94]. For soil uniform subgrade reaction modulus, the critical length is selected as:…”

Section: Equivalent Cantilever Approachmentioning

confidence: 99%

“…They are based on the soil pile system's horizontal stiffness, maximum moment of the pile, and the pile's elastic buckling load. Cantilever idealizationidealism of the pile for the pinned head state [94] For each equivalency, the boundary condition at the pile head is either fixed (no rotation) or pinned (no moment) (Figs. 26 & 27).…”

Section: Equivalent Cantilever Approachmentioning

confidence: 99%

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A Review: Study of Integral Abutment Bridge with Consideration of Soil-Structure Interaction

Naji¹,

Firoozi

Firoozi³

2020

Lat. Am. j. solids struct.

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Bridges are one of the most critical parts of transportation networks that may suffer damages against earthquakes. Also, seismic responses of most bridges are significantly influenced by soil-structure interaction effects. Taking out expansion joints in the bridges may cause many difficulties in design and analysis due to the complexity of soil-structure interaction and nonlinear behavior. The secondary loads on an IAB include seismic load, temperature variation, creep, shrinkage, backfill pressure on back wall and abutment, all of which cause superstructure length and stress variations in girder changes. The purpose of this study is to recognize the most effective parameters of analysis IABs. Findings show that the backfill material behind the IABs has a significant effect on the performance of IABs. Using a compressible material behind the abutments would enhance the in-service performance of IABs. Finally, behaviour of abutment may be greatly affected by thermal load and soil pressure. Thermal expansion coefficient significantly influences girder axial force, girder bending moment, and pile head/abutment displacement.

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Section: Equivalent Cantilever Approachmentioning

confidence: 99%

Section: Equivalent Cantilever Approachmentioning

confidence: 99%

A Review: Study of Integral Abutment Bridge with Consideration of Soil-Structure Interaction

Naji¹,

Firoozi

Firoozi³

2020

Lat. Am. j. solids struct.

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show abstract

“…As a result, lateral responses of columns and bearings will be underestimated if the backwall failure is not taken into account. Stefanidou et al 29 . investigated soil–structure interaction and seismic fragility assessment of bridges with backwalls using a numerical backwall model that considered the flexural failure mechanism––the formation of a plastic hinge at the backwall bottom.…”

Section: Introductionmentioning

confidence: 99%

Influence of abutment straight backwall fracture on the seismic response of bridges

Zheng

Yang

Xie

et al. 2021

Earthq Engng Struct Dyn

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Field reconnaissance reports reveal the seismic vulnerability of bridge abutment foundations. To reduce the time and cost of postearthquake repair, modern seismic design specifications allow abutment backwalls to fracture before the supporting abutment foundations reach their maximum strength. This design strategy enables abutment backwalls to function as a fuse, thus protecting the abutment foundations from experiencing excessive forces and damage. This paper introduces a new abutment modeling scheme to capture the shear fracture mechanism of straight backwalls in seat abutments. To this end, a backwall connection spring is developed and incorporated into a spring system that simulates the behavior of various abutment components. The importance of considering the backwall fracture is examined by reviewing conventional modeling methodologies for abutments and building companion numerical models. Static pushover and incremental dynamic analyses (IDAs) were conducted for two bridges (single‐ and two‐span) modeled by both the proposed and conventional abutment modeling schemes. Moreover, component‐level fragility curves are developed using IDA results. The comparisons show that the conventional abutment modeling schemes significantly overestimate abutment foundation damage and underestimate the likelihood of deck unseating, column damage, and bearing displacement in the passive direction. Conversely, the proposed modeling scheme is able to capture the essential seismic responses of various components in seat abutment bridges. The consideration of backwall fracture in the modeling of abutment components enables a more rational seismic response assessment of bridges with backwalls, which are likely to be damaged during earthquakes, particularly for bridges which are seismically designed to protect abutment foundations.

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“…Macedo and Castro [41] applied the Adaptive Harmony Search algorithm to select recorded GMs for code-based and CMS-based spectral matching. Stefanidou et al [42] used a greedy heuristic optimisation algorithm to facilitate GM selection specifically at the bedrock level combined with one-dimensional site response analysis of a bridge-soil system. Moschen et al [36] used the NSGA-II GA [43] to support the multi-objective optimization framework discussed previously.…”

Section: Introductionmentioning

confidence: 99%

Selection of earthquake ground motions for multiple objectives using genetic algorithms

Mergos

Sextos

2019

Engineering Structures

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Existing earthquake ground motion (GM) selection methods for the seismic assessment of structural systems focus on spectral compatibility in terms of either only central values or both central values and variability. In this way, important selection criteria related to the seismology of the region, local soil conditions, strong GM intensity and duration as well as the magnitude of scale factors are considered only indirectly by setting them as constraints in the pre-processing phase in the form of permissible ranges. In this study, a novel framework for the optimum selection of earthquake GMs is presented, where the aforementioned criteria are treated explicitly as selection objectives. The framework is based on the principles of multi-objective optimization that is addressed with the aid of the Weighted Sum Method, which supports decision making both in the preprocessing and post-processing phase of the GM selection procedure. The solution of the derived equivalent single-objective optimization problem is performed by the application of a mixed-integer Genetic Algorithm and the effects of its parameters on the efficiency of the selection procedure are investigated. Application of the proposed framework shows that it is able to track GM sets that not only provide excellent spectral matching but they are also able to simultaneously consider more explicitly a set of additional criteria.

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Soil-structure interaction effects in analysis of seismic fragility of bridges using an intensity-based ground motion selection procedure

Abstract: Soil-structure interaction effects in analysis of seismic fragility of bridges using an intensity-based ground motion selection procedure. Engineering Structures, 151, pp. 366-380.

Cited by 79 publications

References 40 publications

A Review: Study of Integral Abutment Bridge with Consideration of Soil-Structure Interaction

A Review: Study of Integral Abutment Bridge with Consideration of Soil-Structure Interaction

Influence of abutment straight backwall fracture on the seismic response of bridges

Selection of earthquake ground motions for multiple objectives using genetic algorithms

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