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学者姓名：何乐洽
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The mechanical properties of concrete-filled steel tubular (CFST) members are influenced by the possible debonding gap between the steel tube and concrete core. To investigate this phenomenon, finite element models (FEMs) of the CFST columns with different debonding types, such as the circumferential debonding gap (CDG) and spherical-cap debonding gap (SDG), were established by using ABAQUS. The accuracy of the FEMs was verified comparing the obtained results with experimental ones. The verified FEMs were used to analyze the influence of different debonding types on the mechanical performance of the axially compressed CFST stub columns with the same debonding arc-length ratio (RD). The results showed that with an increase in RD, the ultimate load-bearing capacity (Nu) of CFST columns decreased. However, a critical RD (RD-cr) was found, in fact when the RD was less than or equals to the RD-cr, the influence of different debonding types on the Nu and failure modes of CFST columns were basically the same. When the RD was larger than the RD-cr, with an increase in RD, the Nu of SDG CFST columns decreased linearly, however, the Nu of CDG CFST columns decreased nonlinearly with gradually reduced decrease rates. Finally, it was found that the overall bending, inward and outward buckling in SDG CFST columns were more serious than those in CDG CFST columns. © 2023 The Author(s).
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| GB/T 7714 | Xue, J.Q. , Huang, J.P. , He, L.Q. et al. Influence of different debonding gap types on mechanical performance of axially compressed CFST stub columns with same debonding arc-length ratio [C] . 2023 : 2754-2761 . |
| MLA | Xue, J.Q. et al. "Influence of different debonding gap types on mechanical performance of axially compressed CFST stub columns with same debonding arc-length ratio" . (2023) : 2754-2761 . |
| APA | Xue, J.Q. , Huang, J.P. , He, L.Q. , Briseghella, B. , Contento, A. . Influence of different debonding gap types on mechanical performance of axially compressed CFST stub columns with same debonding arc-length ratio . (2023) : 2754-2761 . |
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Vibration-based structural health monitoring is an efficient technique for dynamic assessment of the structures. Based on the identified dynamic characteristics, the condition of a bridge can be assessed by means of structural identification through the finite element model updating procedure. The modal parameters are generally the indicators that reflect the changes of the global performance of the bridges. As the supplement, non-destructive evaluation methods can be employed to provide more detailed information about the local condition of the structure. In this study, operational modal analysis was performed on a butterfly-arch pedestrian bridge at Fuhzou Univesity, which was based on an innovative design concept, known as the stress-ribbon bridge. The uncertain model parameters of the structure were identified by updating the refined FE model in reference to the experimental modes. The ultrasonic instruments and rebound hammers were used to determine the debonding condition of the concrete-filled steel tubular sections of the main arches and the elastic modulus of the concrete slabs, respectively. Both of them play an important role to influence the dynamic behaviour of the bridge. The key structural parameters that were identified by the FE model updating procedure are compared to the nondestructive testing results. It’s found that the nondestructive testing methods provide important supplementary information to the SHM for condition assessment of the structure. © 2023 The Author(s).
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| GB/T 7714 | Huang, J.P. , He, L.Q. , Xue, J.Q. et al. Dynamic assessment of a stress-ribbon CFST arch bridge with SHM and NDE [C] . 2023 : 2762-2769 . |
| MLA | Huang, J.P. et al. "Dynamic assessment of a stress-ribbon CFST arch bridge with SHM and NDE" . (2023) : 2762-2769 . |
| APA | Huang, J.P. , He, L.Q. , Xue, J.Q. , Zhou, S.N. , Briseghella, B. , Castoro, C. et al. Dynamic assessment of a stress-ribbon CFST arch bridge with SHM and NDE . (2023) : 2762-2769 . |
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The dynamic behavior of a butterfly-arch stress-ribbon pedestrian bridge located in Fuzhou, Fujian, China was investigated under ambient excitation. Highly synchronous tri-axial wireless sensors were used to get an estimate of the model parameters, finding eight stable modes with bending and torsional deformations in the frequency range 3.59-14.92 Hz. Different finite element models of the bridge were developed and a parametric optimization process with a sensitivity-based algorithm was performed to achieve the best model which could be used as baseline for a long-term monitoring of the bridge. (c) 2023 The Authors. Published by Elsevier B.V.
Keyword ：
Butterfly-arch stress-ribbon pedestrian bridge Butterfly-arch stress-ribbon pedestrian bridge finite element modelling finite element modelling operational modal analysis operational modal analysis sensitivity-based model updating sensitivity-based model updating Structural Health Monitoring ( SHM) Structural Health Monitoring ( SHM)
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| GB/T 7714 | He, Leqia , Castoro, Chiara , Aloisio, Angelo et al. Investigation of a butterfly-arch stress-ribbon pedestrian bridge under ambient excitation: dynamic identification, FE modelling and parametric optimization [J]. | XIX ANIDIS CONFERENCE, SEISMIC ENGINEERING IN ITALY , 2023 , 44 : 1594-1601 . |
| MLA | He, Leqia et al. "Investigation of a butterfly-arch stress-ribbon pedestrian bridge under ambient excitation: dynamic identification, FE modelling and parametric optimization" . | XIX ANIDIS CONFERENCE, SEISMIC ENGINEERING IN ITALY 44 (2023) : 1594-1601 . |
| APA | He, Leqia , Castoro, Chiara , Aloisio, Angelo , Zhang, Zhiyong , Marano, Giuseppe C. , Gregori, Amedeo et al. Investigation of a butterfly-arch stress-ribbon pedestrian bridge under ambient excitation: dynamic identification, FE modelling and parametric optimization . | XIX ANIDIS CONFERENCE, SEISMIC ENGINEERING IN ITALY , 2023 , 44 , 1594-1601 . |
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以一座新建的整体式桥台桥梁(简称整体桥)为工程背景，建立服务于健康监测的精细化基准动力有限元模型.将设计阶段基于梁格法建立的全桥三维模型与采用梁-壳单元的精细化模型作为初始有限元模型，把环境激励下获取的实测模态信息(自振频率与振型)作为参照，基于参数灵敏度分析修正了上述两种结构模型.结果表明：尽管两种模型修正后都可以获得与实测模态尤其是频率值较好的吻合度，但修正后的梁格模型的模型参数严重偏离其真实的物理意义，难以作为长期监测的基准模型；而修正后的精细化梁-壳单元模型的模型参数物理意义明确，可以作为计入环境因素影响(如温度、湿度等)的结构长期监测的基准模型.该研究还基于动力试验和模型分析结果讨论...
Keyword ：
基准模型 基准模型 整体桥 整体桥 有限元模型修正 有限元模型修正 灵敏度分析 灵敏度分析 环境振动试验 环境振动试验
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| GB/T 7714 | 张志勇 , 何乐洽 , 薛俊青 et al. 实测模态下三跨整体桥精细化基准有限元模型 [J]. | 福州大学学报(自然科学版) , 2022 , 50 (02) : 228-236 . |
| MLA | 张志勇 et al. "实测模态下三跨整体桥精细化基准有限元模型" . | 福州大学学报(自然科学版) 50 . 02 (2022) : 228-236 . |
| APA | 张志勇 , 何乐洽 , 薛俊青 , 陈梦圆 , 黄福云 , Giuseppe Carlo Marano et al. 实测模态下三跨整体桥精细化基准有限元模型 . | 福州大学学报(自然科学版) , 2022 , 50 (02) , 228-236 . |
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Curved cable-stayed bridges have been regularly accepted due to their ability to cross long spans, and a number of studies have been conducted to investigate the mechanical or dynamic performance of them. Meanwhile, currently just a few studies focus on the curved composite cable-stayed bridges. In this study, an operational modal testing and finite element model updating of a conventional straight bridge with the steel-concrete composite girder were conducted to investigate the performance of the potential methods for the model updating, which included the direct method and the sensitivity-based iterative method. Then, dynamic tests were performed for one typical curved steel-concrete composite cable-stayed bridge as the key case study. A highly refined finite element model of the bridge was developed and then calibrated based on the aforementioned methods in reference to the experimental results. Finally, the dynamic behavior of the curved steel-concrete composite cable-stayed bridge was studied based on the model. It is found that the solution accuracy of the finite element model can be improved significantly by employing the structural health monitoring technique. Moreover, by using the iterative method, the solutions of the updating parameters are generally more accurate compared with the solutions of the direct method. Nevertheless, when the appropriate choices are made for the algorithmic parameters, both methods can lead to the updated models with satisfactory numerical analysis results as compared to the experimental data.
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| GB/T 7714 | Fa, Guanzhe , He, Leqia , Fenu, Luigi et al. Dynamic Performance Analysis of a Curved Cable-Stayed Bridge Based on the Direct Method and the Sensitivity-Based Iterative Method [J]. | ADVANCES IN CIVIL ENGINEERING , 2022 , 2022 . |
| MLA | Fa, Guanzhe et al. "Dynamic Performance Analysis of a Curved Cable-Stayed Bridge Based on the Direct Method and the Sensitivity-Based Iterative Method" . | ADVANCES IN CIVIL ENGINEERING 2022 (2022) . |
| APA | Fa, Guanzhe , He, Leqia , Fenu, Luigi , Briseghella, Bruno . Dynamic Performance Analysis of a Curved Cable-Stayed Bridge Based on the Direct Method and the Sensitivity-Based Iterative Method . | ADVANCES IN CIVIL ENGINEERING , 2022 , 2022 . |
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The article focuses on the dynamic identification and finite element (FE) modelling of a butterfly-arch stress-ribbon pedestrian bridge in Fuzhou, Fujian, China. The Stochastic Subspace Identification method yields an estimate of the operational modal parameters. A highly synchronous tri-axial wireless sensor network was deployed on the bridge deck to record the structure's ambient vibration. Eight stable modes in the frequency range 3.59-14.92 Hz were found, associated with prevalent bending and torsional deformations. Four distinct FE models of the bridge with progressive complexity and accuracy were developed to investigate the sensitivity of the modal features to the modelling choices. The FE model characterised by the fittest agreement with the experimental modal parameters was used for the automatic parametric optimisation based on a sensitivity-based algorithm. The stiffness of the springs simulating the soil-structure interaction, the elastic modulus of the concrete deck and the elastic modulus of the tendons were chosen as updating parameters for a total of eight parameters. The effect of non-structural elements (handrails) and prestress on the modal features are also investigated. The final advanced FE model developed can serve as baseline for a long-term monitoring of the bridge during its life-cycle, and also provides some recommendations to practitioners and scholars all over the world for the modelling and analysis of this particular kind of footbridges.
Keyword ：
Butterfly-arch stress-ribbon pedestrian bridge Butterfly-arch stress-ribbon pedestrian bridge finite element modelling finite element modelling operational modal analysis operational modal analysis sensitivity-based model updating sensitivity-based model updating structural health monitoring structural health monitoring
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| GB/T 7714 | He, Leqia , Castoro, Chiara , Aloisio, Angelo et al. Dynamic assessment, FE modelling and parametric updating of a butterfly-arch stress-ribbon pedestrian bridge [J]. | STRUCTURE AND INFRASTRUCTURE ENGINEERING , 2021 , 18 (7) : 1064-1075 . |
| MLA | He, Leqia et al. "Dynamic assessment, FE modelling and parametric updating of a butterfly-arch stress-ribbon pedestrian bridge" . | STRUCTURE AND INFRASTRUCTURE ENGINEERING 18 . 7 (2021) : 1064-1075 . |
| APA | He, Leqia , Castoro, Chiara , Aloisio, Angelo , Zhang, Zhiyong , Marano, Giuseppe C. , Gregori, Amedeo et al. Dynamic assessment, FE modelling and parametric updating of a butterfly-arch stress-ribbon pedestrian bridge . | STRUCTURE AND INFRASTRUCTURE ENGINEERING , 2021 , 18 (7) , 1064-1075 . |
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The paper presents and discusses the dynamic response of a curved cable-stayed bridge in Venice (Italy). Two distinct experimental campaigns in 2010 and 2011 led to identifying the bridge dynamic characteristics in operational conditions. The dynamic identification included the characterization of both the deck and cables response. The authors developed a highly refined finite element (FE) model of the bridge, mirroring up to twelve experimental modes. An updating procedure drove the estimate of the optimum parameters associated with the lowest discrepancy with the experimental modal parameters. The calibrated model was the base of a parametric analysis on the effects of the deck curvature, cables arrangement and tower cross-section inertia on the bridge dynamics. Specifically, the authors developed fourteen FE models of the bridge distinguished by the lack and different arrangement of the stay cables, the increasing value of the deck curvature and the tower cross-section inertia. The analysis intends to quantify the impact of the design choices of cable-stayed bridges on the modal parameters.
Keyword ：
Cable-stayed bridge Cable-stayed bridge Finite element modelling Finite element modelling Operational modal analysis Operational modal analysis Sensitivity-based model updating Sensitivity-based model updating Structural health monitoring Structural health monitoring
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| GB/T 7714 | Briseghella, Bruno , Fa, Guanzhe , Aloisio, Angelo et al. Dynamic characteristics of a curved steel-concrete composite cable-stayed bridge and effects of different design choices [J]. | STRUCTURES , 2021 , 34 : 4669-4681 . |
| MLA | Briseghella, Bruno et al. "Dynamic characteristics of a curved steel-concrete composite cable-stayed bridge and effects of different design choices" . | STRUCTURES 34 (2021) : 4669-4681 . |
| APA | Briseghella, Bruno , Fa, Guanzhe , Aloisio, Angelo , Pasca, Dag , He, Leqia , Fenu, Luigi et al. Dynamic characteristics of a curved steel-concrete composite cable-stayed bridge and effects of different design choices . | STRUCTURES , 2021 , 34 , 4669-4681 . |
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Vibration-based monitoring was performed on a short-span skewed highway bridge on the basis of wireless measurements. By means of operational modal analysis, highly accurate modal results (frequencies and mode shapes) were extracted by using a self-developed wireless acquisition system, for which the performance was verified in the field. In order to reproduce the experimental modal characteristics, a refined finite element model was manually tuned to reduce the idealization errors and then updated with the sensitivity method to reduce the parametric errors. It was found that to build a reliable Finite element (FE) model for application in structural health monitoring, the effects of superelevation and boundary conditions of a skewed bridge should be taken into account carefully.
Keyword ：
bridge dynamics bridge dynamics operational modal analysis operational modal analysis skewed bridge skewed bridge superelevation superelevation vibration-based monitoring vibration-based monitoring wireless sensors wireless sensors
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| GB/T 7714 | He, Leqia , Reynders, Edwin , Garcia-Palacios, Jaime H. et al. Wireless-Based Identification and Model Updating of a Skewed Highway Bridge for Structural Health Monitoring [J]. | APPLIED SCIENCES-BASEL , 2020 , 10 (7) . |
| MLA | He, Leqia et al. "Wireless-Based Identification and Model Updating of a Skewed Highway Bridge for Structural Health Monitoring" . | APPLIED SCIENCES-BASEL 10 . 7 (2020) . |
| APA | He, Leqia , Reynders, Edwin , Garcia-Palacios, Jaime H. , Marano, Giuseppe Carlo , Briseghella, Bruno , De Roeck, Guido . Wireless-Based Identification and Model Updating of a Skewed Highway Bridge for Structural Health Monitoring . | APPLIED SCIENCES-BASEL , 2020 , 10 (7) . |
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In this paper, a novel approach to model updating for a large-scale railway bridge using orthogonal diagonalization (OD) coupled with an improved particle swarm optimization (IPSO) is proposed. Particle swarm optimization (PSO) is a well-known and widely applied evolutionary algorithm. However, as other evolutionary algorithms (EAs), PSO has two main drawbacks that may reduce its capability to tackle optimization issues. A fundamental shortcoming of PSO is premature convergence. On the other hand, since PSO employs all populations to seek the best solution through iterations, it is very time-consuming. This makes PSO as well as EAs difficult to apply for optimization problems of large-scale structural models. In order to overcome those drawbacks, we propose coupling OD with IPSO (ODIPSO). OD is applied to arrange the position of particles and to select only particles with the best solution for next iterations, which helps to reduce the computational cost dramatically. There are several significant features of ODIPSO: (1) IPSO is employed to tackle the problem of premature convergence of PSO; (2) only one guide is used to update the velocity of particles instead of utilizing both guides, consisting of the local best and the global best; and (3) in each iteration, only the velocity and the position of the best particles are updated. In order to assess the effectiveness of the proposed approach, a large-scale railway bridge calibrated on the field is employed. This paper also introduces the use of wireless triaxial sensors (replacing classical wired systems) to obtain structural dynamic characteristics. The appearance of wireless triaxial transducers increases significantly the freedom in designing an ambient vibration test. The results show that ODIPSO not only outperforms PSO, IPSO and OD combined with PSO (ODPSO) in terms of accuracy, but also dramatically reduces the computational time compared to PSO and IPSO. (C) 2020 Elsevier Ltd. All rights reserved.
Keyword ：
Ambient vibration test Ambient vibration test Improved particle swarm optimization Improved particle swarm optimization Large-scale bridge Large-scale bridge Model updating Model updating Orthogonal diagonalization Orthogonal diagonalization Wireless triaxial sensors Wireless triaxial sensors
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| GB/T 7714 | Tran-Ngoc, H. , He, Leqia , Reynders, Edwin et al. An efficient approach to model updating for a multispan railway bridge using orthogonal diagonalization combined with improved particle swarm optimization [J]. | JOURNAL OF SOUND AND VIBRATION , 2020 , 476 . |
| MLA | Tran-Ngoc, H. et al. "An efficient approach to model updating for a multispan railway bridge using orthogonal diagonalization combined with improved particle swarm optimization" . | JOURNAL OF SOUND AND VIBRATION 476 (2020) . |
| APA | Tran-Ngoc, H. , He, Leqia , Reynders, Edwin , Khatir, S. , Le-Xuan, T. , De Roeck, G. et al. An efficient approach to model updating for a multispan railway bridge using orthogonal diagonalization combined with improved particle swarm optimization . | JOURNAL OF SOUND AND VIBRATION , 2020 , 476 . |
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Risk assessment plays an important role in quantifying earthquake loss and has been widely used in the field of seismic engineering. However, current studies of the risk assessment rarely consider the different failure modes of piers (i.e., flexure failure, flexure-shear failure and shear failure), which will lead to an excessive estimation for the seismic performance and collapse safety of the reinforced concrete girder bridges. This paper focuses on studying the seismic behavior of bridges considering different failure modes and comparing the seismic collapse risk of the bridges with and without ductile detailing. The numerical analysis is performed in an open source finite element (FE) software framework, Open Sees. Nonlinear shear springs are introduced into the FE models of reinforced concrete (RC) columns to accommodate the shear and flexural-shear effect of the bridges. The accuracy of the FE models is validated by using the existing results of static cyclic-loading experiments. Case studies are conducted for two categories of the girder bridges, which are designed based on new and old seismic design criteria in China, respectively. The collapse fragility curves are developed by using the incremental dynamic analysis method, which considers the uncertainties of the ground-motion characteristics and the structural material parameters. Based on the seismic hazard curve of a designated region, a comparative assessment of the seismic collapse risk is performed regarding mean annual collapse rate for the non-ductile and ductile bridges. The main results of the paper are: (1) The FE model with the nonlinear shear spring provides an acceptably accurate solution for simulating the initial stiffness, shear failure point, strength degradation slope and residual shear strength of the RC columns; (2) The structural collapse safety is shown to be related not only to the collapse probability of the bridges but also to the occurring probability of the ground motion intensity exceeding a given threshold; (3) The mean annual collapse rate of the ductile girder bridges is significantly smaller than that of the non-ductile girder bridges. The results can be used as a reference to implement specific policies for appraising and mitigating the seismic risk of existing RC bridges.
Keyword ：
Collapse Collapse Non-ductile girder bridge Non-ductile girder bridge Seismic fragility Seismic fragility Seismic risk comparison Seismic risk comparison Shear failure Shear failure
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| GB/T 7714 | Huang, Caigui , Chen, Libo , He, Leqia et al. Comparative assessment of seismic collapse risk for non-ductile and ductile bridges: a case study in China [J]. | BULLETIN OF EARTHQUAKE ENGINEERING , 2020 . |
| MLA | Huang, Caigui et al. "Comparative assessment of seismic collapse risk for non-ductile and ductile bridges: a case study in China" . | BULLETIN OF EARTHQUAKE ENGINEERING (2020) . |
| APA | Huang, Caigui , Chen, Libo , He, Leqia , Zhuo, Weidong . Comparative assessment of seismic collapse risk for non-ductile and ductile bridges: a case study in China . | BULLETIN OF EARTHQUAKE ENGINEERING , 2020 . |
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