IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures最新文献_第5页

Safety level of longitudinally stiffened plates under biaxial loading considering different launching bearings and eccentricities 考虑不同发射轴承和偏心距的双轴载荷下纵向加筋板的安全水平

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0377

N. Maier, Martin Mensinger, Enea Tallushi, Joseph Ndogmo

{"title":"Safety level of longitudinally stiffened plates under biaxial loading considering different launching bearings and eccentricities","authors":"N. Maier, Martin Mensinger, Enea Tallushi, Joseph Ndogmo","doi":"10.2749/prague.2022.0377","DOIUrl":"https://doi.org/10.2749/prague.2022.0377","url":null,"abstract":"In general, today two types of launching bearings are used in the construction of large steel and steel concrete composite bridges: sliding rockers and systems with hydraulic bearings. During incremental launching, the centre of the webs of the superstructure is not perfectly in line with the centre of the launching bearings due to unavoidable tolerances. These eccentricities are not considered in the current design against plate buckling according to DIN EN 1993-1-5 [2]. Furthermore, there is a significant difference between the different types of launching bearings due to the boundary conditions. At the Technical University Munich, large-scale buckling tests were carried out on longitudinally stiffened plates under biaxial stresses with different types of launching bearings and eccentric load introduction. The test results as well as the results from the validated numerical model demonstrate the influence of different types of launching bearings on the buckling behaviour. The results are compared with the buckling verification according to the reduced stress method proposed in DIN EN 1993-1-5 [2].","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"12 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":"123822667","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

Computational Sensitivity Analysis for Construction Stage Models 施工阶段模型的计算灵敏度分析

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1676

M. Fußeder, K. Bletzinger

引用次数: 0

Fatigue analysis of existing railway bridges: strengthening through geometry improvement 既有铁路桥梁的疲劳分析:通过几何改进进行加固

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0515

Hans Pétursson

{"title":"Fatigue analysis of existing railway bridges: strengthening through geometry improvement","authors":"Hans Pétursson","doi":"10.2749/prague.2022.0515","DOIUrl":"https://doi.org/10.2749/prague.2022.0515","url":null,"abstract":"Fatigue analyses of steel bridges are usually based on nominal stresses and available detail categories. Assessment of existing railway bridges often show that the theoretical service life has expired although there are no visible cracks on the bridge. This is partly because results from fatigue testing have large scatter, leading to low design values. Another explanation is that the calculation methods are simple and not very accurate and that the many conservative simplifications that are made lead to an overestimation of the actual fatigue stress range and an underestimation of fatigue strength.To carry out better assessments, the Swedish Transport Administration has studied a structural detail that consists of a gusset plate welded to a flange. This paper will present results from fatigue test of three steel beams with details corresponding to detail number 5 in table 8.4 EN 1993-1-9 [1]. Furthermore, fatigue tests and research in literature are analysed to investigate if the detail category can be elevated from detail nr. 4 by grinding a radius that is smaller than the radius that is specified in EN 1993-1-8 for detail nr 5 in table 8.4. The results have been introduced in the Swedish codes for assessment and maintenance of bridges.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"27 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":"134073583","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

Improving of fatigue assessment method of stud shear connectors using experimental data from studs' test of existing road bridge 利用既有公路桥螺栓试验数据，对螺栓剪力连接件疲劳评价方法进行了改进

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0224

Nikolai Kozak, V. Bystrov, Dmitry Yaroshutin, Nikolai Daliaev

{"title":"Improving of fatigue assessment method of stud shear connectors using experimental data from studs' test of existing road bridge","authors":"Nikolai Kozak, V. Bystrov, Dmitry Yaroshutin, Nikolai Daliaev","doi":"10.2749/prague.2022.0224","DOIUrl":"https://doi.org/10.2749/prague.2022.0224","url":null,"abstract":"Nowadays there are varieties of methods for fatigue assessment of stud shear connectors in bridges with steel-concrete composite superstructures. These methods can consider various parameters, such as traffic flow characteristics, asymmetry factors, etc. Bridge design codes used in Russia are quite conservative in this matter and prescribe fatigue assessment based only on the maximum stress value, taking into consideration the reduction factor, ignoring the actual traffic loads. To improve the methodology for fatigue assessment, the authors of the article performed a full-scale experiment on a reconstructed bridge on the federal highway in Russia. The purpose was to determine the actual dynamic stresses in stud shear connectors from the transport load. During the reconstruction of the bridge, strain gauges were installed on stud shear connectors, and then connected to a digital measuring system. The article provides a complete description of the methods used and the results of the experiment. Based on the obtained data analysis, authors propose recommendations for adjusting the standard impact factors. Based on the results of comparison of the damage values obtained theoretically and experimentally, the authors make a proposal on the need to adjust the design loads used.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"9 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":"114629590","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 experimental and numerical approach to investigate the load- deformation behaviour of anchorages with headed fasteners in reinforced-concrete columns 采用试验和数值方法研究了钢筋混凝土柱中带头紧固件锚固的荷载变形特性

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0586

Taygun Fırat Yolacan, M. Schäfer

{"title":"An experimental and numerical approach to investigate the load- deformation behaviour of anchorages with headed fasteners in reinforced-concrete columns","authors":"Taygun Fırat Yolacan, M. Schäfer","doi":"10.2749/prague.2022.0586","DOIUrl":"https://doi.org/10.2749/prague.2022.0586","url":null,"abstract":"This paper presents the results of experimental and numerical investigations performed to determine load-bearing resistance and load-deformation behaviour of an structural joint comprised of an anchor plate with headed fasteners (studs) embedded in a reinforced-concrete (RC) column which was detailed with supplementary steel reinforcements next to the anchor plate. The load- deformation behaviour of joint, crack patterns on the RC-column, load distribution on the supplementary reinforcements and the failure modes of the anchorage are presented in detail. In addition, the overall test geometry is modelled in a finite element analysis software, Abaqus, to better understand the main failure mechanism of the anchorage and the loads carried by the supplementary reinforcements. The finite element analysis outputs are validated with the data collected during the test. Detailed investigations of the test results and the analysis outputs showed that the concrete breakout body was formed progressively due to the concrete-cone and concrete pry-out failures but the overall joint failure was triggered by the pull-out failure mode. The ultimate test capacity is compared with the maximum vertical load to be applied to the joint derived from EN1992 – 4:2018 based on the mean resistances of the joint components, and derived from the recent studies in the literature. It is shown that EN1992-4:2018 underestimates the test capacity while the recent approaches are promising for the development of more reliable design equations.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"13 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":"114247621","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

Analysis of the Florida International University Pedestrian Bridge Collapse 佛罗里达国际大学人行天桥坍塌分析

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1033

Vojtěch Kolínský, J. Žitný

{"title":"Analysis of the Florida International University Pedestrian Bridge Collapse","authors":"Vojtěch Kolínský, J. Žitný","doi":"10.2749/prague.2022.1033","DOIUrl":"https://doi.org/10.2749/prague.2022.1033","url":null,"abstract":"The paper describes the investigation process of the collapse of the pedestrian bridge in Miami, Florida (USA). The main span concrete truss structure with a length of 174-foot (53 m) collapsed during construction onto the active highway beneath which had fatal consequences. FINLEY was approached to conduct an independent analysis of the bridge structure for one of the subcontractors involved with the project. As part of an analysis of the bridge behavior, detailed calculation models were developed, and advanced method of structural analysis were used. Finite element method (FEM) brick model of the entire span was created and the stresses at the failure area were investigated in detail. Computation FEM models were supplemented and verified by the strut and tie modelling (STM). The construction process and transport of the bridge span was also simulated. The analysis shows the issues and risks associated with the design of structures with a non-transparent flow of internal forces and demonstrates the need for a detailed assessment of joints and critical areas during all phases of the construction process. The results of the analysis were subsequently confirmed by later published investigation report of the US National Transportation Safety Board.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"1 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":"115746908","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

Experimental and numerical study on unequal lateral impact behavior of Circular RC and CFRPRC components 圆形RC和CFRPRC构件不等侧向冲击特性的试验与数值研究

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1890

Yanhui Liu, Al-Bukhaiti Khalil, Shichun Zhao, Abas Hussein, Xu Nan, Yang Lang, Yu Yan Xing, Daguang Han

{"title":"Experimental and numerical study on unequal lateral impact behavior of Circular RC and CFRPRC components","authors":"Yanhui Liu, Al-Bukhaiti Khalil, Shichun Zhao, Abas Hussein, Xu Nan, Yang Lang, Yu Yan Xing, Daguang Han","doi":"10.2749/prague.2022.1890","DOIUrl":"https://doi.org/10.2749/prague.2022.1890","url":null,"abstract":"The dynamic response of Reinforced Concrete (RC) and Carbon Fiber Reinforced Polymers with Reinforced Concrete (CFRPRC) is studied. These tests were performed on RC members covered in one to six layers of CFRP. Once the energy is high, the two components' deflection-time histories are produced. It increases component impact resistance in studies. Component deflection is reduced by carbon fiber reinforced polymer (CFRP). RC members shear while CFRPRC components bend due to significant concrete damage. It fractures more easily when wrapped with CFRP. The model's predictions match the tests adequately. A numerical simulation study looked at the impact force of members under unequal-span lateral collisions. Regardless of impact velocity, lateral impact on an unequal span induces severe shear failure of RC members. However, CFRPRC component bending deformation reflects impact velocity. Increasing the reinforcement ratio of RC members has little effect on the impact resistance of CFRPRC components. To avoid steel fracture, greater reinforcing ratios are used.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"41 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":"115401393","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

Review of the current state of standardisation on monitoring, data-informed safety assessment and decision-making regarding maintenance of the transport infrastructure 检讨有关运输基础设施维修的监察、数据安全评估及决策的标准化现况

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1309

D. Allaix, Agnieszka Bigaj‐van Vliet, Benjamin Cerar

{"title":"Review of the current state of standardisation on monitoring, data-informed safety assessment and decision-making regarding maintenance of the transport infrastructure","authors":"D. Allaix, Agnieszka Bigaj‐van Vliet, Benjamin Cerar","doi":"10.2749/prague.2022.1309","DOIUrl":"https://doi.org/10.2749/prague.2022.1309","url":null,"abstract":"Road and railway infrastructure networks form the backbone of European transportation systems, carrying more than 80% of passenger and 50% of goods transport in Europe. Bridges and tunnels which are critical elements of the transport infrastructure networks, have in many cases reached their design service life and keep ageing, with the maintenance needs constantly increasing. Besides, transport infrastructure currently carry significantly more traffic loads than what it has been originally designed for and the topology of traffic keeps changing e.g. due to introduction of platooning or autonomous vehicles. Such conditions bring safety risks to bridges and tunnels. In the last two decades there have been nearly 30 major failures of road and railway bridges and tunnels in Europe, with hundreds of people killed and injured. At the same time, resources and capacity for conservation and care are too limited and should be used in an optimised way to counteract the growing backlog of maintenance. There is a strong conviction that use of novel technologies for condition survey may aid the task of managing the safety risks to transport infrastructure. Despite increasing amount of good practise, uniform approach to data-informed safety and risk assessment, and maintenance decision-making is however missing.This contribution presents the review of the current state of standardisation on monitoring, data- informed safety assessment and maintenance policies of bridges and tunnels in the European countries. This forms an essential step in the development and implementation of harmonised standards across Europe, which is believed to be a key strategy to increase the safety level of the transport infrastructure.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"133 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":"122884902","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: 2

BIM authoring and Data Models for Bridge Maintenance Systems in Korea 韩国桥梁维修系统的BIM制作和数据模型

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.1867

Chang-Gun Shim, Kitae Roh, N. Dang

{"title":"BIM authoring and Data Models for Bridge Maintenance Systems in Korea","authors":"Chang-Gun Shim, Kitae Roh, N. Dang","doi":"10.2749/prague.2022.1867","DOIUrl":"https://doi.org/10.2749/prague.2022.1867","url":null,"abstract":"A digital model-based bridge maintenance system (BMS) is a challenging mission due to large volume of bridge inventory and their data for long period. Building information modelling (BIM) provides an efficient information delivery during life-cycle of bridge projects. In this paper, model authoring with visual programming for bridges is introduced to minimize the effort to create 3D models for the information delivery. A data model for a few bridge types is also suggested to deliver essential information for the bridge maintenance. During design and construction, digital engineering models are defined to accommodate information requirements from project participants. Changes of geometry and their properties are collected to revise the digital engineering models for reliable as- built models. Existing bridge maintenance systems in Korea need to be improved for nation-wide digitalized bridges. Two cases of BIM-based BMS on a cable-stayed bridge and common bridges are introduced. The new systems included point cloud data by scanning and data from non-destructive testing as a part of the data model. Through these efforts, data pipeline from data creation to data uses was attempted, and data-driven bridge maintenance can be realized in national scale","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"37 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":"125413283","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

Verification of fatigue load model for stay cables 斜拉索疲劳荷载模型的验证

IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures Pub Date : 1900-01-01 DOI: 10.2749/prague.2022.0820

Heikki Lilja, Atte Mikkonen

{"title":"Verification of fatigue load model for stay cables","authors":"Heikki Lilja, Atte Mikkonen","doi":"10.2749/prague.2022.0820","DOIUrl":"https://doi.org/10.2749/prague.2022.0820","url":null,"abstract":"The selection of an adequate fatigue load model for the design of a cable-stayed bridge is an important task, since the shape of the S-N-curve for stay cables is very sensitive to slight changes in stress ranges. On one hand too light a fatigue load model may lead to a theoretically unsafe structure, and on the other hand too severe a fatigue load model may easily lead to unnecessary costs and waste of material, compromising sustainability.Eurocodes, in general, apply only to loaded lengths of up to 200 meters. The fatigue load models have been calibrated against beam models, and they currently lack the needed tools for application to medium to long-span cable-stayed bridges.Some European countries, including Finland, have relatively high traffic loads (up to 76 ton vehicles allowed), which have not been accounted for in the background calculations for current presented fatigue load models.In this paper, the different Eurocode fatigue load models (FLM1…FLM4) are discussed within the context of a case bridge with 250-meter main span. In addition, a method for verifying the fatigue load model based on the available traffic data and maximum allowed vehicle in Finland is presented. The presented method gives the decision makers an assurance that the chosen load model can be used economically without compromising the safety of the structure.","PeriodicalId":168532,"journal":{"name":"IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures","volume":"17 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":"126179291","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