Bridge Structures最新文献_第4页

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":null,"pages":null},"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":null,"pages":null},"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

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

J. Radnić, D. Matešan, I. Banović

引用次数: 0

Modal frequencies of bridges from GNSS (GPS) monitoring data: Experimental, statistical evidence 全球导航卫星系统（GPS）监测数据中桥梁的模态频率：实验统计证据

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Bridge Structures Pub Date : 2021-06-11 DOI: 10.3233/BRS-210184

S. Stiros, F. Moschas, P. Triantafyllidis

{"title":"Modal frequencies of bridges from GNSS (GPS) monitoring data: Experimental, statistical evidence","authors":"S. Stiros, F. Moschas, P. Triantafyllidis","doi":"10.3233/BRS-210184","DOIUrl":"https://doi.org/10.3233/BRS-210184","url":null,"abstract":"GNSS technology (known especially for GPS satellites) for measurement of deflections has proved very efficient and useful in bridge structural monitoring, even for short stiff bridges, especially after the advent of 100 Hz GNSS sensors. Mode computation from dynamic deflections has been proposed as one of the applications of this technology. Apart from formal modal analyses with GNSS input, and from spectral analysis of controlled free attenuating oscillations, it has been argued that simple spectra of deflections can define more than one modal frequencies. To test this scenario, we analyzed 21 controlled excitation events from a certain bridge monitoring survey, focusing on lateral and vertical deflections, recorded both by GNSS and an accelerometer. These events contain a transient and a following oscillation, and they are preceded and followed by intervals of quiescence and ambient vibrations. Spectra for each event, for the lateral and the vertical axis of the bridge, and for and each instrument (GNSS, accelerometer) were computed, normalized to their maximum value, and printed one over the other, in order to produce a single composite spectrum for each of the four sets. In these four sets, there was also marked the true value of modal frequency, derived from free attenuating oscillations. It was found that for high SNR (signal-to-noise ratio) deflections, spectral peaks in both acceleration and displacement spectra differ by up to 0.3 Hz from the true value. For low SNR, defections spectra do not match the true frequency, but acceleration spectra provide a low-precision estimate of the true frequency. This is because various excitation effects (traffic, wind etc.) contribute with numerous peaks in a wide range of frequencies. Reliable estimates of modal frequencies can hence be derived from deflections spectra only if excitation frequencies (mostly traffic and wind) can be filtered along with most measurement noise, on the basis of additional data.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-210184","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42624705","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: 3

Influence of lateral impact on reinforced concrete piers under drying-wetting cycle and chloride ion corrosion environment 干湿循环和氯离子腐蚀环境下横向冲击对钢筋混凝土桥墩的影响

IF 0.6

Bridge Structures Pub Date : 2021-06-11 DOI: 10.3233/BRS-210186

W. Dong, C. Fang, S. Yang

{"title":"Influence of lateral impact on reinforced concrete piers under drying-wetting cycle and chloride ion corrosion environment","authors":"W. Dong, C. Fang, S. Yang","doi":"10.3233/BRS-210186","DOIUrl":"https://doi.org/10.3233/BRS-210186","url":null,"abstract":"In order to study the influence of lateral impact on reinforced concrete piers in marine environment, drop hammer impact tests were carried out on piers with different corrosion rates obtained from drying-wetting cycle and chloride ion corrosion experiment to study the crack propagation process and failure modes of piers. Then by numerical simulation, the influences of impact velocity, impact mass, compressive strength of concrete and impact number on the performance of corroded piers were studied. The results showed that the failure modes of piers with different corrosion rates under lateral impact were different. The non-corrosive and low corrosion rate piers were destroyed by the bending shear which was jointly controlled by the transverse bending crack and oblique shear crack. The medium corrosion rate pier was the bending shear failure caused by oblique shear crack. The high corrosion rate pier was the joint action of bending shear crack and rust expansion crack. The increase of impact velocity, impact mass and impact number will increase the maximum deflection and the damage of the corroded piers, but the increase degrees were different. The increase was largest when the impact number was increased. Increasing impact number from 1 to 5, the maximum deflection increased by 26.3 times and the number of damage element increased by 4.3 times. Increasing the compressive strength of concrete will decrease the damage of pier, but with less degree. Increasing the compressive strength from 25 to 45 MPa, the maximum deflection and number of damage element were decreased by 10.7% and 9.4% respectively.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-210186","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41828116","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 Issue 17(1-2) 社论第17期（1-2）

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Bridge Structures Pub Date : 2021-06-11 DOI: 10.3233/BRS-210188

K. Mahmoud

引用次数: 0

Effects of corrosion on a steel bowstring bridge in marine environment: A case-study of assessment and retrofit 海洋环境中钢弓弦桥的腐蚀影响:评估与改造实例研究

IF 0.6

Bridge Structures Pub Date : 2021-03-29 DOI: 10.3233/BRS-200178

M. Granata

引用次数: 0

Mechanical properties of steel fiber reinforced concrete material in construction of road bridge deck 道路桥面施工中钢纤维混凝土材料的力学性能

IF 0.6

Bridge Structures Pub Date : 2021-03-29 DOI: 10.3233/BRS-200180

Xiaohu Luo

引用次数: 1

Editorial Issue 16(4) 第十六期社论(4)

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Bridge Structures Pub Date : 2021-03-29 DOI: 10.3233/BRS-210182

K. Mahmoud

引用次数: 0

Integration of practical supplemental measurements into bridge condition visual inspection grading 将实际补充测量纳入桥梁状况目视检查分级

IF 0.6

Bridge Structures Pub Date : 2021-03-29 DOI: 10.3233/BRS-200179

Nefize Shabana, Ö. Avşar, A. Caner

{"title":"Integration of practical supplemental measurements into bridge condition visual inspection grading","authors":"Nefize Shabana, Ö. Avşar, A. Caner","doi":"10.3233/BRS-200179","DOIUrl":"https://doi.org/10.3233/BRS-200179","url":null,"abstract":"The reliability of condition assessment of bridges obtained from analysis of visual inspection data is always a big concern among structural engineers. It has been known that the condition grading of a bridge is very subjective and can convey limited information to the end user. To finalize and verify the reported condition grading, inspectors and bridge owners have mainly been relying on images. It has been known that the image observation may not be sufficient to address all kinds of problems associated with visual condition grading. The integration of practical supplemental measurements into condition grading as proposed in this paper will contribute to minimize the errors in visual inspection. Measurement of vehicle induced vibrations through wireless accelerometers can be used to determine the natural frequencies of the bridge that can be reported at each inspection. The change in frequencies can be an indication of deterioration in stiffness of bridge over the years. Taking concrete samples by chipping at the inspection site and analyzing them under scanning electron microscope (SEM) at the laboratory can be used to identify the current problems with concrete degradation. In this scope, the regular bridge inspection procedure with the proposed enhancements has been performed on field inspection of highway bridges in Turkey to determine the practicality of the quick supplemental measurements and to analyze the difference in grading of the three different inspectors with different level of experiences.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-200179","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46630034","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