Developing fragility curves for a pile-supported wharf

Chiou, Jiunn-Shyang; Chiang, Chi-Han; Yang, Ho-Hsiung; Hsu, Shang-Yi

doi:10.1016/j.soildyn.2011.01.011

Cited by 63 publications

(18 citation statements)

References 33 publications

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“…The proprieties of this new material were defined with Mohr ulomb model. � � = � �� (23) tan(� � ) = � �� tan(� �� )…”

Section: Materials Model For Structural Elementsmentioning

confidence: 99%

“…Recently, a large volume of research works used seismic fragility curves as a useful tool to evaluate the seismic performance of pile-supported wharves. [23][24][25][26][27][28][29][30] Several port structures use batter piles to provide lateral resistance and to limit deflections from lateral loads, such as ship berthing and seismic loads. In the past, engineers contest the use of batter piles due to the poor performance under earthquake, caused by the lack of proper design of the batter piles head connections.…”

Section: Introductionmentioning

confidence: 99%

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The influence of the soil constitutive models on the seismic analysis of pile-supported wharf structures with batter piles in cut-slope rock dike

Deghoul

Gabi

Hamrouni

2020

Studia Geotechnica Et Mechanica

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AbstractIn coastal regions, earthquakes caused severe damage to marine structures. Many researchers have conducted numerical investigations in order to understand the dynamic behavior of these structures. The most frequently used model in numerical calculations of soil is the linear-elastic perfectly plastic model with a Mohr-Coulomb failure criterion (MC model). It is recommended to use this model to represent a first-order approximation of soil behavior. Therefore, it is necessary to accommodate soil constitutive models for the specific geotechnical problems.In this paper, three soil constitutive models with different accuracy were applied by using the two-dimensional finite element software PLAXIS to study the behavior of pile-supported wharf embedded in rock dike, under the 1989 Loma Prieta earthquake. These models are: a linear-elastic perfectly plastic model (MC model), an elastoplastic model with isotropic hardening (HS model), and the Hardening Soil model with an extension to the small-strain stiffness (HSS model).A typical pile-supported wharf structure with batter piles from the western United States ports was selected to perform the study. The wharf included cut-slope (sliver) rock dike configuration, which is constituted by a thin layer of rockfill overlaid by a slope of loose sand. The foundation soil and the backfill soil behind the wharf were all dense sand. The soil parameters used in the study were calibrated in numerical soil element tests (Oedometer and Triaxial tests).The wharf displacement and pore pressure results obtained using models with different accuracy were compared to the numerical results of Heidary-Torkamani et al.[28] It was found that the Hardening Soil model with small-strain stiffness (HSS model) gives clearly better results than the MC and HS models.Afterwards, the pile displacements in sloping rockfill were analyzed. The displacement time histories of the rock dike at the top and at the toe were also exposed. It can be noted that during the earthquake there was a significant lateral ground displacement at the upper part of the embankment due to the liquefaction of loose sand. This movement caused displacement at the dike top greater than its displacement at the toe. Consequently, the behavior of the wharf was affected and the pile displacements were important, specially the piles closest to the dike top.

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“…The proprieties of this new material were defined with Mohr ulomb model. � � = � �� (23) tan(� � ) = � �� tan(� �� )…”

Section: Materials Model For Structural Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The influence of the soil constitutive models on the seismic analysis of pile-supported wharf structures with batter piles in cut-slope rock dike

Deghoul

Gabi

Hamrouni

2020

Studia Geotechnica Et Mechanica

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“…The limit-states of displacement ductility are defined as the three damage states (i.e. minor damage, major damage, and collapse), as shown in Table 4, which is introduced from the works of Song et al 31 and Chiou et al 32 The three damage states are defined by ductility demand (M D ), which can be calculated by equation (5), and the structural meanings of the first two damage states are the first and second occurrences of plastic hinge, respectively. Note that when the second plastic hinge occurs, the displacement is rapidly increased due to the external load.…”

Section: Statistical Parameters and Limit-statesmentioning

confidence: 99%

Flood fragility analysis for bridges with multiple failure modes

Kim

Sim

Lee

et al. 2017

Advances in Mechanical Engineering

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Bridges are one of the most important infrastructure systems that provide public and economic bases for humankind. It is also widely known that bridges are exposed to a variety of flood-related risk factors such as bridge scour, structural deterioration, and debris accumulation, which can cause structural damage and even failure of bridges through a variety of failure modes. However, flood fragility has not received as much attention as seismic fragility despite the significant amount of damage and costs resulting from flood hazards. There have been few research efforts to estimate the flood fragility of bridges considering various flood-related factors and the corresponding failure modes. Therefore, this study proposes a new approach for bridge flood fragility analysis. To obtain accurate flood fragility estimates, reliability analysis is performed in conjunction with finite element analysis, which can sophisticatedly simulate the structural response of a bridge under a flood by accounting for flood-related risk factors. The proposed approach is applied to a numerical example of an actual bridge in Korea. Flood fragility curves accounting for multiple failure modes, including lack of pier ductility or pile ductility, pier rebar rupture, pile rupture, and deck loss, are derived and presented in this study.

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“…Takahashi and J. Takemura, 2005;Caihua Shen and Xingwei Niu, 2012;King H. Chin. et al, 2008;Jiunn-Shyang Chiou et al, 2011;Lobedan FR et al, 2002;Hsien Hua Leea et al, 2007;Zahra Tajali and Mehdi Shafieefar, 2011).To the writer's knowledge, however, limited information was found in the literature in regard to the shore-connecting structure. Bing Ren and Yongxue Wang (2005) studied the random wave impact on a piled wharf with different shore-connecting structure by performing laboratory test.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Aquatic-Sand Pile Composite Foundation Reinforcing for New Shore-Connecting Structure

Zhuang

Sun

Jun-hua

2014

Marine Georesources & Geotechnology

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The Yangshan deepwater port is the only container port built in the islands off the mainland of China. Batter piles with a sheet-pile supported platform bulkhead structure was firstly used as a new shore-connecting structure to connect the front main wharf structure and the back land. Large-diameter sand columns were also used to reinforce the soft foundation of the shore-connecting structure in the deep water of the open sea. 3D nonlinear FEM model based on real geological conditions was built to optimize the large-diameter sand columns reinforcing scheme and investigate shore-connecting structure's mechanical properties under different construction conditions. The replacement ratio of 30%, the bottom elevation of the fourth soil layer, and the soft soil just below and directly adjacent to the shore-connecting structure were determined as optimal replacement ratio, reinforcing depths and reinforcing area of the large-diameter sand columns reinforcement by assessing the force and deformation of shore-connecting structure. By numerical computing, the maximum displacement of supported platform was 11.03 cm which was close to the measured value; and the piles' maximum stress, Downloaded by [Selcuk Universitesi] at 01:15 04 February 2015 2 displacement and moments were all smaller than the design strength. These indicated that the shore-connecting structure could remain stable by optimal sand columns reinforcing scheme.

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Developing fragility curves for a pile-supported wharf

Cited by 63 publications

References 33 publications

The influence of the soil constitutive models on the seismic analysis of pile-supported wharf structures with batter piles in cut-slope rock dike

The influence of the soil constitutive models on the seismic analysis of pile-supported wharf structures with batter piles in cut-slope rock dike

Flood fragility analysis for bridges with multiple failure modes

Stability Analysis of Aquatic-Sand Pile Composite Foundation Reinforcing for New Shore-Connecting Structure

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