Modified generalized pushover analysis for estimating longitudinal seismic demands of bridges with elevated pile foundation systems

Cao, Sasa; Yuan, Wancheng

doi:10.1590/s1679-78252014001400008

Cited by 5 publications

(3 citation statements)

References 18 publications

(20 reference statements)

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“…This subsection describes the cases and assumptions for evaluating the performance of simulation‐based optimization in predicting whole BSCCs. The system simulated by the numerical model consists of a pier and a superstructure on its top (see Figure 6) to model a simply supported beam bridge with a monopile foundation according to Mylonakis et al 34 and Cao and Yuan 48 . A cylindrical pier was chosen because this type of pier has serious scour issues, for example, scour depth over 6 m, according to field measurements reported by Mueller and Wagner 49 .…”

Section: Resultsmentioning

confidence: 99%

Bridge scour characteristic curve for natural frequency‐based bridge scour monitoring using simulation‐based optimization

Bao

Liu

2021

Struct Control Health Monit

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Summary This study addresses a key issue that prevents the wide application of the novel predominant natural frequency (PNF)‐based method for bridge scour monitoring, which is also applicable to the frequency‐based health monitoring of other structures with soil–structure interaction. This issue is that no theory or method is currently available to guide the prediction of scour depths based on measured PNFs. The most feasible way is to first measure a few scour depths and their corresponding PNFs for obtaining the PNF–scour depth relationship, which is termed the bridge scour characteristic curve (BSCC) in this study, and then use this BSCC to predict future scour depths with measured PNFs. This study provides a comprehensive investigation into the BSCC and proposes a simulation‐based optimization approach, in which the whole BSCC, that is, from light to severe scour conditions, can be predicted with a few measured scour depth–PNF data points (e.g., 2–4) within a small scour depth range (e.g., 0.2–0.5 m). The proposed approach integrates the Winkler‐based numerical model into a global optimization technique to predict the whole BSCC to avoid the use of a closed‐form BSCC function, which may not exist. Additionally, the approach can be used to estimate the modulus of subgrade reaction, which is very hard to obtain at real bridges. The performance of the proposed approach was evaluated using several practical scenarios with realistic multilayered soil conditions. We found that the proposed approach is accurate for predicting the whole BSCC with four measured points or even less, regardless of the scour severity for the measurements and the number of the soil layer. For applications, the influence of random errors in the measurements of PNFs and scour depths was investigated and concluded to be negligible. This study sets a solid cornerstone for the maturation of the PNF‐based scour monitoring method and other frequency‐based structural health monitoring methods with soil–structure interaction.

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Section: Resultsmentioning

confidence: 99%

Bridge scour characteristic curve for natural frequency‐based bridge scour monitoring using simulation‐based optimization

Bao

Liu

2021

Struct Control Health Monit

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“…For determining demand displacements of PSWSs, a nonlinear static analysis (NSA) is used in current practice consistent to design codes and standards 6–10 . There is an extensive literature on pushover analysis—a typical NSA—but most of these are applied to constructions different from PSWSs 11–23 …”

Section: Introductionmentioning

confidence: 99%

Pushover analysis for flexible and semi‐flexible pile‐supported wharf structures accounting the dynamic magnification factors due to torsional effects

Zacchei

Lyra

Stucchi

2020

Structural Concrete

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This is a pushover analysis for pile‐supported wharves considering the dynamic magnification factors due to torsional effects. The piles seismic design by deterministic approach is shown accounting plastic hinges and P‐delta effects in 2D/3D mathematical modeling. A real structure placed at high seismicity area is considered as case study in order to validate the model and provide reliable technical data. New bound limits of seismic demands associated with damage states and the best soil performance are identified. A stochastic approach is proposed to estimate the no‐exceedance probability of horizontal displacements of a semi‐flexible with respect to a flexible model. Results are plotted in terms of base shears, displacements, and energy. The advantage of the use of pushover analysis in terms of displacements is estimated in 18–38%. Other results as bound limits, hysteretic damping, plastic rotation are compared with previous studies.

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“…Here the nonlinear static analysis, which is commonly known as "pushover analysis", has been defined. The pushover analysis is used for different methodologies and different types of structures, as for the inelastic dynamic analysis for shear buildings [12,28], the spatial reinforced concrete studying the effect of the infills on failure pattern of the reinforced concrete frames [19], the reinforced concrete by using a fibre model [20], the estimation of the yielding and the ultimate displacement to define the level of damage for dams [17], the energy-based adaptive pushover analysis for buildings through a series of nonlinear analysis under strong ground motions [22], the bridges with elevated pile foundation system by dynamic pushover analysis [24], and the pile-supported wharves [23]. The cited cases rely on advanced methods of pushover analyses.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear static analysis of a pile-supported wharf

Zacchei

Lyra

Stucchi

2019

Rev. IBRACON Estrut. Mater.

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The aim of this paper is to carry out a nonlinear static analysis using a case study of a pile-supported wharf in a new oil tankers port. The seismic activity in this area is very intense with the peak ground acceleration of 0.55 g; for this reason, it is very important to analyse the structural behaviour of the nonlinear situation. The analysis of the wharf, modelled in 3D by finite element method, serves to calculate the structure vibration periods (the structure’s first period is 1.68 s) and the capacity curve. The design of the structure follows traditional criteria by international guidelines, and its procedure is in accordance to classic theoretical methods and codes. For the selection of adequate characteristic earthquake input for the pushover analysis European and Venezuelan codes have been used. Besides being important to study the seismic influence on the body of the wharf and on critical elements, as well as and the interaction fluid-structure-soil, it is also important to analyse the consequences of structure failure and to estimate the maximum allowed displacement. The results show that the ultimate displacement is 18,81 cm. A port is an extremely strategic work, which needs to be carefully designed to avoid environmental damage and maintain human safety.

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Modified generalized pushover analysis for estimating longitudinal seismic demands of bridges with elevated pile foundation systems

Cited by 5 publications

References 18 publications

Bridge scour characteristic curve for natural frequency‐based bridge scour monitoring using simulation‐based optimization

Bridge scour characteristic curve for natural frequency‐based bridge scour monitoring using simulation‐based optimization

Pushover analysis for flexible and semi‐flexible pile‐supported wharf structures accounting the dynamic magnification factors due to torsional effects

Nonlinear static analysis of a pile-supported wharf

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