Bridge Structures最新文献_第2页

Correlation between corrosion level and fatigue strength of high-strength galvanized steel wires used for suspension bridge cables 悬索桥用高强度镀锌钢丝腐蚀程度与疲劳强度的关系

IF 0.6

Bridge Structures Pub Date : 2023-07-06 DOI: 10.3233/brs-230214

K. Miyachi, Shoya Saimoto, Yusuke Oki

引用次数: 0

Renovation of the Van Brienenoord Bridge, The Netherlands 荷兰Van Brienenoord大桥改造

IF 0.6

Bridge Structures Pub Date : 2023-07-06 DOI: 10.3233/brs-230211

Kevin Acosta, Daan Tjepkema, Felix de Meijier

引用次数: 0

Rail-structure interaction and vehicle-track-structure interaction level 1 and 2 analyses 轨道-结构相互作用和车辆-轨道-结构相互作用的一级和二级分析

IF 0.6

Bridge Structures Pub Date : 2023-07-06 DOI: 10.3233/brs-230213

M. Fedorova, M. Sivaselvan, O. Kurc, A. Karakaplan

{"title":"Rail-structure interaction and vehicle-track-structure interaction level 1 and 2 analyses","authors":"M. Fedorova, M. Sivaselvan, O. Kurc, A. Karakaplan","doi":"10.3233/brs-230213","DOIUrl":"https://doi.org/10.3233/brs-230213","url":null,"abstract":"Rail-structure interaction (RSI) analysis and vehicle-track-structure-interaction (VTSI) analysis are often required during bridge design. For example, the California High-Speed Train Project requires RSI analysis for final design of all structures, as well as VTSI analysis, with the level of interaction to be modeled determined by the complexity of a structure. The goal of RSI analysis is to ensure that superstructure deformations and rail stresses are within acceptable limits. VTSI analysis is a dynamic analysis that takes into account influence of actual trainsets. VTSI Level 1 analysis includes train loads as a series of moving loads. This analysis allows evaluation of dynamic impact effects from trainsets and vertical accelerations of the deck. For complex high-speed railway bridges, VTSI Level 2 might be required, accounting for full dynamic interaction between the trainset and the bridge. To represent this interaction, the trainset is modeled as a multibody system consisting of rigid bodies, springs, and dashpots. The interaction between wheels and rails is accounted for through kinematic constraints and Lagrange multipliers. This paper presents modeling, RSI, and VTSI analyses of a railway bridge in the LARSA 4D software package. The track and superstructure are modeled in an expedited way using a macro that generates the track, approach, and bridge geometries. Fasteners are modeled as hysteretic springs and automatically positioned along the curved geometry of the track using a LARSA 4D’s bridge path coordinate system definition. RSI analysis is performed accounting for temperature differentials between rails and the deck, vertical train loads, acceleration and braking forces. Break in the rail is introduced using stage construction analysis, followed by progressive collapse analysis (with adapting increments and arc-length control) or nonlinear dynamic analysis. Finally, VTSI Level 1 and 2 analyses are performed and the results are compared. Car body accelerations are compared to limit values to ensure passenger comfort.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42166716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Buffeting response analysis – the stack state-space approach 抖振响应分析——堆栈状态空间方法

IF 0.6

Bridge Structures Pub Date : 2023-07-05 DOI: 10.3233/brs-230210

S. Stoyanoff, Z. Taylor, P. Dallaire, G. Larose

{"title":"Buffeting response analysis – the stack state-space approach","authors":"S. Stoyanoff, Z. Taylor, P. Dallaire, G. Larose","doi":"10.3233/brs-230210","DOIUrl":"https://doi.org/10.3233/brs-230210","url":null,"abstract":"Wind stability and design loads of long-span bridges are assessed applying experimental and theoretical methods. The commonly used approach entails the extraction of fundamental aerodynamic data of key structural elements such as the deck, towers, and cables, either experimentally or numerically, and the application of theoretical models for evaluation of structural responses to turbulent winds. This phenomenon called buffeting is extremely complex and, to date, there is no closed-form theoretical model to reproduce how the wind converts to structural responses and loads which the bridge must resist. The objective of this paper is to explore the base of the problem, namely the transformation of wind gusts to actual loads, and the response estimations. The time domain response approach has been adopted for solution of the generalized equations of motion allowing the exploration of details in the performance of various theoretical interpretations. Starting from the classic quasi-static linear model, theoretical simplifications are removed toward a more complete model of buffeting loads. Non-linear and aerodynamic coupling effects on response predictions are examined specifically aiming at improved buffeting load representations within the framework of the currently available experimental data. A new concept called stack state-space analysis has been introduced for the response solution to wind buffeting. Aerodynamic and structural data of Pierre-Laporte Bridge in Québec City, and the IABSE Working Group 10, long-span bridge validation example, are utilized as representative cases in this study. Avenues for further experimental and numerical validations of the presented new solution approach are suggested toward more accurate predictions of wind response and design loads of long-span bridges.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42676283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on deterioration identification method of rubber bearings for bridges based on YOLOv4 deep learning algorithm 基于YOLOv4深度学习算法的桥梁橡胶支座劣化识别方法研究

IF 0.6

Bridge Structures Pub Date : 2023-07-04 DOI: 10.3233/brs-230209

Xiao-Ni Gao, Hong-Wei Ren, Ruizhao Liu, Min Chen, Rui-Xin Lai

{"title":"Study on deterioration identification method of rubber bearings for bridges based on YOLOv4 deep learning algorithm","authors":"Xiao-Ni Gao, Hong-Wei Ren, Ruizhao Liu, Min Chen, Rui-Xin Lai","doi":"10.3233/brs-230209","DOIUrl":"https://doi.org/10.3233/brs-230209","url":null,"abstract":"How to quickly and accurately identify the bridge rubber bearing deterioration plays an important role in ensuring the bridge structure and road safety. This paper selects the common rubber bearings of domestic bridges as the research object, and proposes an improved YOLOv4-based bridge rubber bearing deterioration detection algorithm to address the reasons for the difficulty in detecting bridge rubber bearing deterioration due to large scale variations and small sample data sets. An image dataset (named HRBD) with annotations is constructed from real inspection scenarios, and the data is expanded by image processing means such as rotation, translation and brightness transformation, so that this dataset has sufficient data complexity and solves the problem of overfitting due to insufficient samples for network training. The anchor applicable to this dataset was regained by the K-means++ clustering algorithm, and then the CA module was inserted into the YOLOv4 backbone network for more accurate anchor localization. The improved YOLOv4 network was used for migration learning to train the dataset, and finally the trained network model was used for detection on the test set. The experimental results show that the improved YOLOv4 bridge rubber bearing deterioration detection and identification network can effectively identify and locate bridge rubber bearings and their deterioration types (crack damage, shear deformation, bearing void).","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46353955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial 编辑

IF 0.6

Bridge Structures Pub Date : 2023-06-16 DOI: 10.3233/brs-230208

K. Mahmoud

引用次数: 0

In memoriam: Ersin Arioğlu 在memoriam: Ersin该报ğlu

IF 0.6

Bridge Structures Pub Date : 2023-05-16 DOI: 10.3233/brs-230207

K. Mahmoud

引用次数: 0

Editorial 编辑

IF 0.6

Bridge Structures Pub Date : 2023-01-06 DOI: 10.3233/brs-220204

K. Mahmoud

引用次数: 0

Study of impact factor of arch bridge made with continuous composite concrete filled steel tube beams 连续钢管混凝土组合梁拱桥冲击系数研究

IF 0.6

Bridge Structures Pub Date : 2023-01-06 DOI: 10.3233/brs-220200

Jie Li, H. Cui, Ziwei Ma, Haikuan Liu, Yuanhong Hu

{"title":"Study of impact factor of arch bridge made with continuous composite concrete filled steel tube beams","authors":"Jie Li, H. Cui, Ziwei Ma, Haikuan Liu, Yuanhong Hu","doi":"10.3233/brs-220200","DOIUrl":"https://doi.org/10.3233/brs-220200","url":null,"abstract":"Impact factor is amplification factor of vertical dynamic effect produced by vehicles. It is a main parameter of bridge design and an important index of dynamic load effect evaluation. In order to study the influence of structure and excitation factors on the impact factor of highway bridges, and then obtain the real impact factor of the continuous beam arch composite bridge, taking a three-span arch bridge made with continuous composite concrete filled steel tube beams as an example, considering the vehicle-bridge coupling vibration effect, the spatial beam element model of the bridge and the half vehicle model with the three-axis are established by using ANSYS. The impact factor of different parts of the main beam and different responses affected by the deck surface roughness, the vehicle speed and the number of vehicles are analyzed. The binary regression formula of impact factor is obtained by taking the vehicle speed and the roughness of bridge deck as independent variables. Finally, the formula is verified by the measured data of two bridges with similar fundamental frequencies. The results show that the impact factor calculated by the current code is generally small for the bridge structure with complex structure and relatively low frequency, such as arch bridge made with continuous composite concrete filled steel tube beams. The impact factor is most affected by the roughness of bridge deck. When the roughness of bridge deck reaches grade B or above, the impact factor exceeds the specification value, and the maximum impact factor can reach 5.42 times of the specification value. For the main beam, the impact factors of different external excitation, different responses and different parts are not the same, and some impact factors exceed the specification value. The regression formula of impact factor given can be used to estimate the impact factor of main beams of similar structures.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43128486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental assessment of link slabs in continuous span applications of press-brake-formed tub girders 连接板在连续跨度中的试验评估压力制动成型槽梁的应用

IF 0.6

Bridge Structures Pub Date : 2023-01-06 DOI: 10.3233/brs-220201

K. Barth, G. Michaelson, Robert M. Tennant, Brook Woldegabriel

引用次数: 1