Optimization of Design Details in Orthotropic Steel Decks Subjected to Static and Fatigue Loads

Xia, Ye; Nassif, Hani; Hwang, Eui‐Seung; Linzell, Daniel G.

doi:10.3141/2331-02

Cited by 14 publications

(7 citation statements)

References 5 publications

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“…Concrete in bridge structures is constantly subjected to C O 2 ingression as well as deterioration processes caused by repeated vehicle loads (Chen et al, 2011; Xia et al, 2013), environmental temperature, and relative humidity (RH) among other factors. Concrete carbonation is a common issue that inevitably affects RC structures in an atmospheric environment.…”

Section: Introductionmentioning

confidence: 99%

Effect of concrete carbonation on natural frequency of reinforced concrete beams

Zhang

Sun

2016

Advances in Structural Engineering

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We carried out an experimental investigation to study the influence of concrete carbonation on the natural frequency of simply supported reinforced concrete beams. A total of 10 reinforced concrete test beams and 12 concrete-carbonation test specimens were subjected to different accelerated carbonation stages for 0, 7, 14, 21, and 28 days. Modal tests were performed on reinforced concrete test beams after the accelerated carbonation stages. In order to reduce the effect of other factors on the modal tests, constant temperature, relative humidity, and boundary conditions of the test beams were maintained in the experimental process. The experimental results show a trend of the natural frequencies of reinforced concrete test beams to decrease with the increase in concrete-carbonation depths. With statistical analyses of experimental data, this study established the relationship between concrete-carbonation depths and natural frequencies. Fitting lines for the drop in natural frequencies and carbonation depths are obtained for the first four modal frequencies. Based on the analysis of the physicochemical processes of concrete carbonation, the main reason behind the drop in natural frequencies is the increase in mass after concrete carbonation. The percentage composition of increase in mass after complete carbonation is obtained based on the analysis of the physicochemical process. This analysis demonstrates part of the reason for the drop in natural frequencies and proves that the experimental results are reliable and credible. This study provides further insight into the use of modal parameters to assess damage in concrete structures in structural health monitoring.

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Section: Introductionmentioning

confidence: 99%

Effect of concrete carbonation on natural frequency of reinforced concrete beams

Zhang

Sun

2016

Advances in Structural Engineering

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“…e main box girder of the Wangyu River Bridge was divided into 142 elements. erefore, a total of 142 mass perturbation models were considered by changing the density of every main box girder element from 2600 to 6000 kg/m 3 .…”

Section: Mass Perturbation Scenarios and Damage Scenariosmentioning

confidence: 99%

“…Damage assessment is an important subproblem of bridge health monitoring (BHM) that provides useful information for the decision-making process to maintain, repair, rehabilitate, or replace a structure [1][2][3]. Over the past three decades, changes in the modal parameters have been extensively used in damage assessment techniques [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Mass‐Stiffness Combined Perturbation Method for Mode Shape Monitoring of Bridge Structures

Zhang

Xia

Galant

et al. 2019

Shock and Vibration

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Identification of the mode shapes through monitoring is one of the key problems in damage diagnosis based on modal parameters especially for damaged structures. In order to obtain mode shapes of damaged structures easily and accurately, the mass-stiffness combined perturbation (MSCP) method is proposed in this paper. To do so, the relationship between the stiffness perturbation mode shapes of damaged and intact structures is firstly derived and established. Then, the principle of similar frequency is applied to optimize the objective function of the most suitable mass perturbation model. Both numerical analyses and experimental tests on simple and complex structures demonstrate that the proposed MSCP method achieves higher precision than traditional mode shape identification methods. The additional advantages of the MSCP method include (i) lower requirement on the frequency analysis of only damaged structures and (ii) higher effectiveness for minor damage scenarios. In fact, the lower the damage, the higher the precision achieved by the MSCP method. As illustrated in the paper, the proposed technique has excellent applications in mode shapes identification and structural health monitoring.

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“…Song et al [12] considered the influence of geometric parameters on the fatigue performance through a parametric analysis model under wheel loads. Xia et al [13] studied the effects of cutouts, the deck thickness, and other important parameters on the fatigue performance based on calibrated FE models. According to the results of the laboratory tests and parametric studies, suggestions for grid deck optimization design were given by Huang et al [14].…”

Section: Introductionmentioning

confidence: 99%

Optimization Analysis Method of New Orthotropic Steel Deck Based on Backpropagation Neural Network‐Simulated Annealing Algorithm

Shi

et al. 2021

Advances in Civil Engineering

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To study the effects of the fatigue performance due to the major design parameter of the orthotropic steel deck and to obtain a better design parameter, a construction parameter optimization method based on a backpropagation neural network (BPNN) and simulated annealing (SA) algorithm was proposed. First, the finite element (FE) model was established, and the numerical results were validated against available full-scale fatigue experimental data. Then, by calculating the influence surface of each fatigue detail, the most unfavorable loading position of each fatigue detail was obtained. After that, combined with the data from actual engineering applications, the weight coefficient of each fatigue detail was calculated by an analytic hierarchy process (AHP). Finally, to minimize the comprehensive stress amplitude, a BPNN and SA algorithm were used to optimize the construction parameters, and the optimization results for the conventional weight coefficients were compared with the construction parameters. It can be concluded that compared with the FE method through single-parameter optimization, the BPNN and SA method can synthetically optimize multiple parameters. In addition, compared with the common weighting coefficients, the weighting coefficients proposed in this paper can be better optimized for vulnerable parts. The optimized fatigue detail stress amplitude is minimized, and the optimization results are reliable. For these reasons, the parameter optimization method presented in this paper can be used for other similar applications.

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Optimization of Design Details in Orthotropic Steel Decks Subjected to Static and Fatigue Loads

Cited by 14 publications

References 5 publications

Effect of concrete carbonation on natural frequency of reinforced concrete beams

Effect of concrete carbonation on natural frequency of reinforced concrete beams

Mass‐Stiffness Combined Perturbation Method for Mode Shape Monitoring of Bridge Structures

Optimization Analysis Method of New Orthotropic Steel Deck Based on Backpropagation Neural Network‐Simulated Annealing Algorithm

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