IABSE Symposium, Istanbul 2023: Long Span Bridges最新文献

Structural Behavior of a 40+ Year Old PSC-I Concrete Bridge According to its Internal Tendon Loss in the Central Part 40年以上龄期psc - 1混凝土桥中部内筋损失的结构行为分析

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0118

Seong Yeonghun, Kim Hyunjoong

{"title":"Structural Behavior of a 40+ Year Old PSC-I Concrete Bridge According to its Internal Tendon Loss in the Central Part","authors":"Seong Yeonghun, Kim Hyunjoong","doi":"10.2749/istanbul.2023.0118","DOIUrl":"https://doi.org/10.2749/istanbul.2023.0118","url":null,"abstract":"Prestressed concrete bridges with a type I girder (PSC-I), hastily built in the 1960s, have been increasingly deteriorating, making their internal tendon prone to rupture, leading to social and economic problems due to bridge collapse and emergency repairs. In this study, a post-tension PSC-I bridge, to be demolished after more than 40 years of service, was evaluated for its structural behavior due to internal tendon loss. The internal tendon of its central part, a weak flexural behavior part, was artificially cut to model an actual damaged structure; its structural behavior was then compared to that of an intact girder. The results showed that stiffness increased from 2.2% to 37.9% depending on the amount of internal tendon loss (loss ratio from 8.3–25%) in the central part of the bridge, with a load reduction of up to 78% when compared to an intact girder. The position of the neutral axis and maximum progress of the crack also increased rapidly due to the change in stiffness and decrease in internal force. Future work will analyze the behavior characteristics according to the location of loss on the girder’s internal tendon, the amount of loss, and the loss of anchorages. Evaluation and analysis of the flexural behavior of PSC-I bridges according to their aging is important and can be addressed by testing the properties (mechanical, longevity) of the bridge’s materials over time and comparing them to the design strength at the time of construction.","PeriodicalId":237396,"journal":{"name":"IABSE Symposium, Istanbul 2023: Long Span Bridges","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115127029","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

Main Cable Inspection and Strength Evaluation of Helicoidal Strand Main Cables Using a Modified NCHRP Evaluation Approach 基于改进NCHRP评价法的螺旋股主缆检测与强度评价

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0409

Jorge Pérez Armiño, Ahsan Chowdhury

{"title":"Main Cable Inspection and Strength Evaluation of Helicoidal Strand Main Cables Using a Modified NCHRP Evaluation Approach","authors":"Jorge Pérez Armiño, Ahsan Chowdhury","doi":"10.2749/istanbul.2023.0409","DOIUrl":"https://doi.org/10.2749/istanbul.2023.0409","url":null,"abstract":"The A. Murray MacKay Bridge (MacKay Bridge) opened to traffic in 1970 and carries four lanes of traffic over the Halifax Harbour between Dartmouth and downtown Halifax, Nova Scotia, Canada. The Bridge's main cable has been opened for detailed visual inspections several times beginning in 2002. The Owner, Halifax Harbour Bridges, retained COWI North America to perform a strength evaluation in accordance with the National Cooperative Highway Research Program (NCHRP) Report 534– Guidelines for Inspection and Strength Evaluation of Suspension Bridge Parallel Wire Cables. As the MacKay Bridge main cable is composed of 61 parallel strands with helicoidal wires, the NCHRP 534 approach (intended for parallel wires) was modified to perform the strength evaluation for cables with helicoidal wires. Based on the analysis performed, it was determined that the main cable of the MacKay Bridge has adequate capacity at this time. Additional measures to protect the cable, mainly through dehumidification, could be considered to prevent further deterioration of the main cable and extend the service life of the cable and therefore the bridge.","PeriodicalId":237396,"journal":{"name":"IABSE Symposium, Istanbul 2023: Long Span Bridges","volume":"282 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123056953","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

An approach for generating spectrum and energy-compatible synthetic accelerograms 一种产生频谱和能量兼容的合成加速度图的方法

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0323

Jiawei Chen

{"title":"An approach for generating spectrum and energy-compatible synthetic accelerograms","authors":"Jiawei Chen","doi":"10.2749/istanbul.2023.0323","DOIUrl":"https://doi.org/10.2749/istanbul.2023.0323","url":null,"abstract":"For the purpose of seismic performance verification of bridges in the process of seismic design, it is desirable to use spectrum-compatible accelerograms. However, it is well known that the correct evaluation of seismic response of structures depends on the well-suited seismic inputs. The appropriate seismic assessment of structures under earthquake loading is affected by the characteristics of accelerograms. For example, Aria Intensity, that is effective in presenting the damage potential of accelerograms. It is found that the Arias Intensity is capable of predicting the likelihood of damage of structures with short period (e.g., short-span bridges. Thus, in addition to being spectrum-compatible, there is a need to correct Arias Intensity of synthetic accelerograms to be energy-compatible in the time domain. Therefore, a simplified method that can generate synthetic accelerograms that are both spectrum-compatible and energy-compatible is necessary. This study proposed a method that can modify Arias Intensity when generating spectrum-compatible synthetic accelerograms for given seismic records. This method introduces an energy-compatible algorithm to the spectrum-compatible model, which makes the generated synthetic accelerograms match with the target response spectrum in the frequency domain and Arias Intensity in the time domain. The proposed method has been validated using various seismic records, its performance is satisfactory and its application is straightforward and quite useful in any seismic design of building new bridges or retrofitting old bridges.","PeriodicalId":237396,"journal":{"name":"IABSE Symposium, Istanbul 2023: Long Span Bridges","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116876812","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

Aero-structural design optimization of long-span bridges: From linear to nonlinear aeroelasticity-driven perspectives 大跨度桥梁的气动结构优化设计:从线性到非线性气动弹性驱动的视角

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0167

M. Cid Montoya, A. Kareem, S. Hernández

{"title":"Aero-structural design optimization of long-span bridges: From linear to nonlinear aeroelasticity-driven perspectives","authors":"M. Cid Montoya, A. Kareem, S. Hernández","doi":"10.2749/istanbul.2023.0167","DOIUrl":"https://doi.org/10.2749/istanbul.2023.0167","url":null,"abstract":"Structural optimization techniques have been demonstrated to be a powerful tool for the cost-effective design of bridges under aeroelastic considerations, particularly when applied to super-long span suspension or cable-stayed bridges. The efficacy of this methodology relies on the comprehensive and accurate formulation of the wind-resistant design problem. The analysis of the wind-induced responses, such as flutter and buffeting, has been typically addressed in the industry by adopting multi-mode analysis techniques using linear force modeling approaches based on the fundamental contributions of Prof. Davenport and Prof. Scanlan. In the same way, the aero-structural optimization frameworks previously developed by the authors have followed this approach by mimicking the design goals and specifications of real bridge projects in the formulation of the optimization problem. However, wind tunnel tests and on-site monitoring measurements have shown that under some circumstances, the so-called linear aeroelasticity models fail in predicting the bridge responses. Hence, several nonlinear aeroelastic methods have been developed in the last decades, including the corrected quasi-steady theory (QST) model, band superposition model, hybrid nonlinear model, rheological model, artificial neural networks (ANN) based model, and Volterra models, among others. These methods should be advanced in order to define deck shape-dependent accurate models that permit their implementation into design optimization frameworks to achieve cost-effective and safe bridge design. This study reviews the effectiveness of these methods and discusses practical directions to follow to adequately implement nonlinear aeroelasticity features into the holistic aero-structural optimization of long-span bridges.","PeriodicalId":237396,"journal":{"name":"IABSE Symposium, Istanbul 2023: Long Span Bridges","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124802814","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

Hybrid solution for the 1915 Canakkale Bridge 1915年恰纳卡莱大桥的混合解决方案

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0783

M. Virlogeux, J. Klein, Thierry Delémont, Laurent Gaudry, Emilie Bellanger

引用次数: 0

New challenges in the IABSE TG3.1 benchmark on super long span bridge aerodynamics 超长跨度桥梁空气动力学IABSE TG3.1基准的新挑战

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0285

Giorgio Diana, S. Stoyanoff

{"title":"New challenges in the IABSE TG3.1 benchmark on super long span bridge aerodynamics","authors":"Giorgio Diana, S. Stoyanoff","doi":"10.2749/istanbul.2023.0285","DOIUrl":"https://doi.org/10.2749/istanbul.2023.0285","url":null,"abstract":"In the last years, extreme climate events as thunderstorm and downburst are becoming increasingly frequent and widespread. These phenomena could significantly impact on the dynamic response of super long-span bridges since they are typically characterized by a sudden variations of the mean wind speed combined with large vertical angles of attack. This contingency is considered an interesting opportunity for the IABSE Task group 3.1, involved for the last 5 years in the benchmark of the software for the computation of the bridge response to the turbulent wind, to extend the applicability of the consolidated numerical procedures to a case of study characterized by a non-synoptic wind. To reach this purpose, taking as a target the full-scale data measured on the Gjemnessund Bridge during two different incoming wind conditions, a comparison with numerical results is proposed. Specifically, the working group has defined two steps of increasing complexity. The first, given the same input data to the participants, consists of a preliminary numerical benchmark while, the second, concerns the comparison between the outcomes and the dynamic response of the real bridge. In this paper, the results of the wind tunnel tests, performed to measure all the aerodynamic coefficients required for numerically simulating the bridge response, are reported. Finally, the first step is presented and some preliminary outcomes are shown.","PeriodicalId":237396,"journal":{"name":"IABSE Symposium, Istanbul 2023: Long Span Bridges","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123700259","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

Key Technology and Practice of Manufacturing Special-shaped Steel Box Girder under European Standards 按欧洲标准制造异形箱梁的关键技术与实践

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0975

Cong Zhu, Fulong Wei

引用次数: 0

Stay-cable Bridge Construction Accelerated 斜拉桥建设加快

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0434

Jindrich Potucek, J. Pfuntner

引用次数: 0

Structural Health Monitoring of Adhesive Bonded Steel Patches for the Reinforcement of Fatigue-Damaged Bridges Using Distributed Fiber Optic Sensors 基于分布式光纤传感器的疲劳损伤桥梁粘接钢片结构健康监测

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0205

T. Baudone, Hinrich Grefe, Garnik Arutyunyan, Mascha Baitinger, E. Stammen, K. Dilger

{"title":"Structural Health Monitoring of Adhesive Bonded Steel Patches for the Reinforcement of Fatigue-Damaged Bridges Using Distributed Fiber Optic Sensors","authors":"T. Baudone, Hinrich Grefe, Garnik Arutyunyan, Mascha Baitinger, E. Stammen, K. Dilger","doi":"10.2749/istanbul.2023.0205","DOIUrl":"https://doi.org/10.2749/istanbul.2023.0205","url":null,"abstract":"In steel bridges, unforeseen fatigue damages can occur in structural details subjected to cyclic loads, making repair measures necessary. Adhesive bonding can provide a valid alternative to the traditional strengthening methods, resulting in an extension of the service life of the structures with lower costs and less material. In this context, adequate strain monitoring is a crucial tool in evaluatingthe behavior of the adhesive bond and safety assessment of the repaired structure. In this study, the authors present the results of laboratory tests where steel plates are reinforced on one side using adhesively bonded patches and subjected to quasi-static load. Optical fiber sensors (FOS) were applied in different positions of the specimen (external surface of the plate, outer surface of the patch, embedded in the adhesive on plate-side and patch-side). The test objective is to confirm the abilityand good performance of the FOS to monitor fatigue damage occurring in the steel plate. The fatigue damage is simulated by reducing the cross section of the steel plates by means of holes of small diameter. The obtained results are analyzed to evaluate the capabilities of the sensors to capture the damage and choose the optimal fiber position among the four described above.","PeriodicalId":237396,"journal":{"name":"IABSE Symposium, Istanbul 2023: Long Span Bridges","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128997389","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

Construction technology innovation of 2300-meter suspension bridge: new diaphragm wall and composite tower 2300米悬索桥施工技术创新:新型连续墙和组合塔

IABSE Symposium, Istanbul 2023: Long Span Bridges Pub Date : 1900-01-01 DOI: 10.2749/istanbul.2023.0962

X. You, Hu Wei, C. Peng, M. Chao

{"title":"Construction technology innovation of 2300-meter suspension bridge: new diaphragm wall and composite tower","authors":"X. You, Hu Wei, C. Peng, M. Chao","doi":"10.2749/istanbul.2023.0962","DOIUrl":"https://doi.org/10.2749/istanbul.2023.0962","url":null,"abstract":"Zhang-Jing-Gao Yangtze River Bridge adopts a double-span suspension bridge with a main span of 2300 meters. The anchorage foundation adopts a composite diaphragm wall, which is used as an temporary supporting structure during construction, and then transformed into a permanent structure, and the main tower adopts a 350-meter composite structure of steel box and steel tube confined concrete. This diaphragm wall has high requirements on the verticality of the slot segment and the installation precision of the rigid joint, and there are difficulties in segment hoisting, linear control and the construction quality control of steel tube concrete of super high tower. Therefore, technical research was carried out: (1) The intelligent aided decision-making system for trenching, the automatic detection and adjustment device for slurry performance, and the three-dimensional shape detection technology for slot are developed to achieve high-precision trenching; (2) The high-precision manufacturing and installation technology of new rigid joint and steel reinforcement cage is studied to reduce the stuck risk; (3) Through the application of W12000-450 intelligent tower crane and construction control with the whole process control concept, the purpose of high precision control of tower alignment is achieved; (4) The pouring platform on tower of concrete and construction technology of self-compacting concrete with 40-meter high drop are developed to ensure the construction quality of steel tube concrete.","PeriodicalId":237396,"journal":{"name":"IABSE Symposium, Istanbul 2023: Long Span Bridges","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124667541","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