Bridge Structures最新文献_第3页

IF 0.6

Bridge Structures Pub Date : 2022-09-28 DOI: 10.3233/brs-220199

K. Mahmoud

引用次数: 0

Model calibration of a long-span concrete cable-stayed bridge based on structural health monitoring data: Influence of concrete variability 基于结构健康监测数据的大跨度混凝土斜拉桥模型标定:混凝土变异性的影响

IF 0.6

Bridge Structures Pub Date : 2022-09-28 DOI: 10.3233/brs-220195

Cortney Natalicchio, H. Al-Khateeb, M. Chajes, Z. Wu, Harry W. Shenton III

{"title":"Model calibration of a long-span concrete cable-stayed bridge based on structural health monitoring data: Influence of concrete variability","authors":"Cortney Natalicchio, H. Al-Khateeb, M. Chajes, Z. Wu, Harry W. Shenton III","doi":"10.3233/brs-220195","DOIUrl":"https://doi.org/10.3233/brs-220195","url":null,"abstract":"Structural Health Monitoring (SHM) systems, in combination with controlled load tests, can provide valuable data for calibrating high fidelity bridge models, which can then be used for evaluating the long-term performance of the bridge, improved load ratings, and permit vehicle evaluation. The objective of this research was to calibrate a 3D model of the Indian River Inlet (IRIB) cable-stayed bridge, using strains recorded by the bridge SHM system during a controlled load test. The bridge was modeled in STAAD-Pro and calibrated using a pre-commercialized software platform that uses a Generic Algorithm to minimize the error between the measured and predicted strains. The calibration parameters were the elastic modulus of groups of the main longitudinal edge girder/deck elements, which once calibrated, could be related to the measured concrete strength of the members. Four different models were investigated, using 6, 10, 14, and 18 parameter element groups of the edge girder members. Of the different models, the 14 and 18 parameter models yielded the best results. The “design” model yielded errors as high as 42% when compared to the measured strains; the error was less than 10% for the majority of measurements for the 14-parameter model. Including the effect of the traffic barriers in the model, the weighted average concrete strength of the calibrated model was within 4% of the measured weighted strength. The calibration was shown to be insensitive to measurement noise and was validated using several unique single and multi-vehicle load cases that were heavier and more offset from the centerline of the bridge. The calibration procedure was able to capture the variability in flexural stiffness of the edge girders due to the variability of the concrete, resulting in significantly better agreement between the live load measured strains and the model predicted strains.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48124065","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

Shear design of precast prestressed concrete NEXT beam bridges: A critical assessment 预制预应力混凝土NEXT梁桥的剪切设计:关键评估

IF 0.6

Bridge Structures Pub Date : 2022-09-28 DOI: 10.3233/brs-220198

Jianwei Huang

{"title":"Shear design of precast prestressed concrete NEXT beam bridges: A critical assessment","authors":"Jianwei Huang","doi":"10.3233/brs-220198","DOIUrl":"https://doi.org/10.3233/brs-220198","url":null,"abstract":"Northeast extreme tee (NEXT) precast prestressed concrete beams have recently emerged as a promising solution to accelerate bridge construction and enhance the sustainability of bridges. To date, several studies on the live load distribution factor (LLDF) for moment and shear in NEXT F beam bridges have been reported, which indicated that using the AASHTO LRFD LLDF for moment in NEXT F beam bridges could provide a sufficient safety margin; however, a 20% increase in the LRFD LLDF for shear was recommended for the safety of shear design. This paper intended to investigate the required transverse shear reinforcements in NEXT F beam bridges by using a factor of 1.2 for the LRFD LLDF for shear. A comprehensive study was carried out by considering various parameters, including concrete strength, beam section, bridge section, and span length. Results from this study showed that providing the minimum transverse shear reinforcement could offer a sufficient safety margin for the shear design of NEXT F beam bridges, even with an increase of 20% on the LRFD LLDF for shear. It is recommended that a factor of 1.2 be used for the LRFD LLDF for shear to ensure a safe design of NEXT F beam bridges, though the minimum transverse reinforcements will be likely to control the shear design.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46224069","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

Stress change calculations in accidentally damaged prestressed bridge girders 意外损伤预应力桥梁主梁应力变化计算

IF 0.6

Bridge Structures Pub Date : 2022-09-28 DOI: 10.3233/brs-220197

H. Tabatabai, A. Nabizadeh

引用次数: 0

Dynamic amplification factors of girder and cables of extradosed bridges during sudden cable failure 拉索突然失效时矮塔主梁和拉索的动力放大系数

IF 0.6

Bridge Structures Pub Date : 2021-12-09 DOI: 10.3233/brs-210189

Homer Buelvas, J. Benjumea, Gustavo Chio

{"title":"Dynamic amplification factors of girder and cables of extradosed bridges during sudden cable failure","authors":"Homer Buelvas, J. Benjumea, Gustavo Chio","doi":"10.3233/brs-210189","DOIUrl":"https://doi.org/10.3233/brs-210189","url":null,"abstract":"The rupture of a cable in cable-supported bridges is an accidental condition that should be considered during the design phase due the impact that this situation could have on the structural safety of the bridge and users. For that reason, design guidelines suggest carrying out a pseudo-static analysis where the failing cable is replaced by a load of the same magnitude as the pre-rupture tension but applied in the opposite direction and multiplied by a dynamic amplification factor (DAF) between 1.5 and 2.0. Previous studies in cable-stayed bridges have shown that the pseudo-static approach may not be suitable. Due to the wide use of extradosed bridges in infrastructure projects around the world, a computational analysis was performed in this investigation to estimate the dynamic amplification factors of extradosed bridge girders and cables when sudden failure of an extradosed cable occurs. The main goal of the study is to determine whether the pseudo-static approach suggested in the guidelines is acceptable. Linear response history analyses were performed by using computational models of extradosed bridges in which the girder stiffness and the suspension (lateral or central) and cable layout (fan or harp) of the cables were modified. From the analysis, the DAFs were calculated and compared to those recommended in the design guidelines. The calculated DAFs for the axial forces and bending moment in the girder of the bridges and for the axial forces in the extradosed cables were smaller than 2.0. However, in some cases the DAF for shear forces were higher than 2.0, especially when the girder stiffness was relatively low. The results indicate that the recommendations of the design guidelines are adequate for extradosed bridges, which is a result of the relatively high stiffness of the girder and low inclination of extradosed cables. Despite this, response history analyses like the one performed in this study are recommended to assess the response of the bridge under cable breakage.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47152976","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

Comparison of eigenanalysis and Ritz vector approaches for response spectrum analysis of soil-pile-bridge systems 土-桩-桥体系响应谱分析的特征分析法与Ritz向量法比较

IF 0.6

Bridge Structures Pub Date : 2021-12-09 DOI: 10.3233/brs-210192

M. Davidson, A. Patil, S. A. Rosenfeld, Z. Zhu

{"title":"Comparison of eigenanalysis and Ritz vector approaches for response spectrum analysis of soil-pile-bridge systems","authors":"M. Davidson, A. Patil, S. A. Rosenfeld, Z. Zhu","doi":"10.3233/brs-210192","DOIUrl":"https://doi.org/10.3233/brs-210192","url":null,"abstract":"Frequency-based analysis techniques such as response spectrum analysis (RSA) are widely used for designing bridges in seismically active regions. Two well-known analysis procedures that underlie RSA are the solution of the eigenproblem and the approximation of the solution to the eigenproblem (i.e., approximation of eigenvectors and eigenvalues) through use of force-dependent Ritz vectors. While frequency-based methods have achieved widespread adoption in practice, certain simplifications remain common, such as neglecting soil-structure interaction (SSI) due to a fixed-base assumption. In the present study, frequency-based techniques packaged within a research version of a design-oriented computational tool are employed to analyze, assess, and compare results obtained from RSA with use of the eigenanalysis, and separately, Ritz vector approaches. Importantly, for the bridge configurations analyzed, SSI is taken into account. As outcomes, the potential benefits of the Ritz vector approach (as well as modeling strategies) are demonstrated. The study outcomes are intended to aid practicing engineers when the need to account for SSI is recognized as pertinent to a given bridge seismic design application.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42450730","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

Shear live load analysis of NEXT beam bridges for accelerated bridge construction NEXT梁桥加速施工的剪切活载分析

IF 0.6

Bridge Structures Pub Date : 2021-12-09 DOI: 10.3233/brs-210191

Jianwei Huang

{"title":"Shear live load analysis of NEXT beam bridges for accelerated bridge construction","authors":"Jianwei Huang","doi":"10.3233/brs-210191","DOIUrl":"https://doi.org/10.3233/brs-210191","url":null,"abstract":"Using precast concrete elements in bridge structures has emerged as an economic and durable solution to enhance the sustainability of bridges. The northeast extreme tee (NEXT) beams were recently developed for accelerated bridge construction by the Precast/Prestressed Concrete Institute (PCI). To date, several studies on the live load distribution factor (LLDF) for moment in NEXT F beam bridges have been reported. However, the LLDFs for shear in NEXT F beam bridges are still unclear. In this paper, the lateral distributions of live load shear in NEXT F beam bridges were examined through a comprehensive parametric study. The parameters covered in this study included bridge section, span length, beam section, number of beams, and number of lanes loaded. A validated finite element (FE) modeling technique was employed to analyze the shear behavior of NEXT F beam bridges under the AASHTO HL-93 loading and to determine the LLDFs for shear in NEXT beam bridges. A method for computing the FE-LLDF for shear was proposed for NEXT beam bridges. Results from this study showed that the FE-LLDFs have a similar trend as the AASHTO LFRD-LLDFs. However, it was observed that some LRFD-LLDFs are lower than the FE-LLDFs by up to 14.1%, which implied using the LRFD-LLDFs for shear could result in an unsafe shear design for NEXT beam bridges. It is recommended that a factor of 1.2 be applied to the LRFD-LLDF for shear in NEXT F beam bridges for structural safety and design simplicity.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48161320","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

Unexpected soil amplification effect on seismic performance of highway bridges during the Aegean earthquake of October 2020, Mw 6.6 2020年10月爱琴海地震期间，意外的土壤放大对公路桥梁抗震性能的影响，Mw 6.6

IF 0.6

Bridge Structures Pub Date : 2021-12-09 DOI: 10.3233/brs-210190

Gamze Muratoğlu, Berk Karakuş, A. Caner, Havin Arslan, Nurettin Pelen, Uzay Genişoğlu, B. Atak

{"title":"Unexpected soil amplification effect on seismic performance of highway bridges during the Aegean earthquake of October 2020, Mw 6.6","authors":"Gamze Muratoğlu, Berk Karakuş, A. Caner, Havin Arslan, Nurettin Pelen, Uzay Genişoğlu, B. Atak","doi":"10.3233/brs-210190","DOIUrl":"https://doi.org/10.3233/brs-210190","url":null,"abstract":"On October 30, 2020, an earthquake about 70 km away from the city center of Izmir with a 4.3 million population has shaken the city tremendously and has resulted in destruction of many building type of structures due to an unexpected high soil-amplified vibrations very similar to the Mexico City earthquake in 1985. The bridges at the soil-amplified sites has performed in elastic range with no damage at all. In the city of Izmir, the 42 year old twin bridges located on the main transportation route, were tremendously shaken by the earthquake had observed to have no seismic induced damage. Surprisingly twin bridges suffering from the alkali silica reaction (ASR) over the years did not even pound to each other despite the small size of longitudinal gap between them. As it has been known, the past performance of Turkish designed bridges are typically succesfull with almost no damage as observed in the Van 2011 and Sivrice 2020 earthquake mainly due to allowing movements at their joints and to flexible type of framing. The focus of the paper is given to understand the successful performance of bridges and to investigate the non-pounded twin bridges of the Izmir city. In this scope, a bridge inspection has been performed and the twin bridges have been analyzed for the recorded ground motion. The results have indicated that the structures have been subjected to 0.3 g at their vibration modes and the twin bridges have a synchronized motion due to having the identical vibration mode shape with a period of 1.5 seconds","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47412562","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

Structural health monitoring of bridge spans using Moment Cumulative Functions of Power Spectral Density (MCF-PSD) and deep learning 使用功率谱密度矩累积函数（MCF-PSD）和深度学习对桥梁跨度进行结构健康监测

IF 0.6

Bridge Structures Pub Date : 2021-06-11 DOI: 10.3233/BRS-210183

Thanh Q. Nguyen, Hoang B. Nguyen

{"title":"Structural health monitoring of bridge spans using Moment Cumulative Functions of Power Spectral Density (MCF-PSD) and deep learning","authors":"Thanh Q. Nguyen, Hoang B. Nguyen","doi":"10.3233/BRS-210183","DOIUrl":"https://doi.org/10.3233/BRS-210183","url":null,"abstract":"This article proposes a new parameter in evaluating mechanical behaviors of defected bridge spans. It is Moment Cumulative Function of Power Spectral Density (MCF-PSD) based on changes in shape of power spectrum and trained via cumulative function of spectral moment value by deep learning model. This new parameter allows evaluating stiffness attenuation along time, thereby helps to forecast the workability of bridge span. It can identify risky positions in not only a bridge span but also various spans of the same bridge, which proves its sensitivity to the structure’s behavior change over time. This study reveals that training MCF-PSD using cumulative function algorithm has gained outstanding results in comparison with previous studies in structural quality assessment. Therefore, it fulfills criteria of evaluating the damage level in a structure and also fosters new development of defect diagnosis and forecast. Conclusions from this study show that the change of this function is the basis to evaluate difference among measurement positions in the same span or among different spans of the same bridge and behaviors at different positions in the same span. Therefore, MCF-PSD is more sensitive than other parameters in evaluating the structure’s stiffness attenuation.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":"17 1","pages":"15-39"},"PeriodicalIF":0.6,"publicationDate":"2021-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-210183","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46871049","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: 7

Bridges with multiple structural systems: The example of Trilj Bridge reconstruction in Croatia 具有多种结构系统的桥梁：以克罗地亚Trilj大桥重建为例

IF 0.6

Bridge Structures Pub Date : 2021-06-11 DOI: 10.3233/BRS-210185

J. Radnić, D. Matešan, I. Banović

引用次数: 0