Procedia Structural Integrity最新文献_第7页

Savitzky-Golay Smoothing and Differentiation Filters for Damage Identification in Plates 用于板材损伤识别的萨维茨基-戈莱平滑和微分滤波器

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.01.121

J.V. Araújo dos Santos , H. Lopes

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Road bridges exposure and alternative routes: towards the definition of road network resilience 道路桥梁风险和替代路线：确定道路网络的复原力

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.021

{"title":"Road bridges exposure and alternative routes: towards the definition of road network resilience","authors":"","doi":"10.1016/j.prostr.2024.09.021","DOIUrl":"10.1016/j.prostr.2024.09.021","url":null,"abstract":"<div><div>The road network represents both element-at-risk and key infrastructure to ensure the accessibility of peripheral areas. The overall risk levels of bridges depend on geophysical (mainly earthquakes and landslides) and hydrometeorological hazards (mainly floods), the physical vulnerability of structures, and the exposure (mainly resulting from traffic flows and the presence of alternative roads). In mountain contexts and peripheral territories, the accessibility of entire territorial system directly depends on few trunk and secondary roads. The risk assessment of bridges, according to the Ministerial Guidelines, provides inputs for a territorial risk assessment starting from the accessibility of peripheral territories and the redundancy of the road network as features to determine the resilience of the road network. This study aims at understanding the relationships between bridges as elements-at-risk part of the road network and the influence they have on the overall accessibility of a territory. In this study, through a GIS analysis of a set of selected roads of the Provinces of Caserta (Campania Region), the presence of bridges along the selected roads have been combined with data on the accessibility levels of municipalities they connect. At this purpose, reference to the classification provided by the National Strategy for Inner Areas (SNAI) has been made to understand how such a classification can change due to a road interruption because of a bridge interruption. The contribution aims at setting the stage for the implementation of a method to determine the presence of alternative roads based on travel times adopted by the SNAI classification and, as a result, the definition of unique threshold values that justifies the variation of the exposure class and allows to determine the resilience of the whole road network.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Analysis of the failure costs of a bridge 桥梁故障成本分析

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.019

{"title":"Analysis of the failure costs of a bridge","authors":"","doi":"10.1016/j.prostr.2024.09.019","DOIUrl":"10.1016/j.prostr.2024.09.019","url":null,"abstract":"<div><div>The preferable maintenance strategy for aged bridges is the one which involves the lowest possible total cost for the community, where for each bridge the total cost is expressed by the sum of the costs of the interventions plus total damages caused by exceeding the limit states multiplied by the probability of exceeding the limit states.</div><div>The most delicate and most complex part of the calculation is the determination of damages since the uncertainties involved are many and the values of these parameters may significantly impact on the results of the calculation. Each damage can be estimated as the sum of direct costs (reconstruction of the collapsed part, social consequences like injuries and fatalities, environmental effects) and indirect damages (infrastructure disruption, psychological effects).</div><div>Direct costs are quite easy to calculate, but they are also the least significant items. We could evaluate the huge amount of indirect costs using the studies available in literature and also learning from past accidents. Today we know the economic and social consequences of many historical collapses, so it is possible to find out which factors influence the results the most and to determine the real magnitude of each type of damage. In this article many indications are provided to make a reliable estimate of the failure costs for a generic bridge.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Experimental and analytical investigation on the evaluation of residual stresses in prestressed concrete girders 预应力混凝土大梁残余应力评估的实验和分析研究

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.051

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The Italian Guidelines for special inspections of post-tensioned concrete bridges: review and case study 意大利后张法混凝土桥梁特殊检查准则：回顾与案例研究

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.045

{"title":"The Italian Guidelines for special inspections of post-tensioned concrete bridges: review and case study","authors":"","doi":"10.1016/j.prostr.2024.09.045","DOIUrl":"10.1016/j.prostr.2024.09.045","url":null,"abstract":"<div><div>Post-tensioned (PT) concrete bridges are structural systems characterized by intrinsic fragility. The assessment of their health condition is very difficult due to their nature, which prevents the detection of degradation in PT elements through conventional investigation methods and/or visual inspections. For this reason, the Italian Guidelines for the maintenance of existing bridges envisage special inspections to assess the condition of the post-tensioning system. According to the dedicated Guideline, the special inspection procedure consists of four steps. First there is Step O, which identifies the number and location of PT samples to be investigated based on the historical•critical review of available documentation and the visible defects in the post-tensioned members. Then, in Step 1 a preliminary analysis of the identified PT elements is performed, identifying the presence and location of active defects and grout voids, as well as the probability of corrosion of the reinforcement through non-destructive tests. In Step 2, the analysis of defects becomes more accurate, determining the probability of corrosion and estimating the level of stress in the concrete and in post-tensioned cables through locally destructive tests. Step 3 is applied if the outcome of Step 2 is uncertain and involves the experimental analysis of the overall structural response of the bridge. Eventually, in case the presence of damaged PT elements is confirmed, a load assessment of the structure is performed. The objective of this study is to evaluate the effectiveness of the investigation method proposed by the Italian Guidelines, highlighting its strengths and potential weaknesses. The procedure is applied to the Dora Riparia River Bridge, located in Avigliana (Turin) on provincial road SP197. The bridge consists of seven spans, 21.4 m long, and is characterized by a simply supported static layout; each span has four post-tensioned I-shape beams and four post-tensioned diaphragms.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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The IRRADIA research project for the advanced management of infrastructures IRRADIA 基础设施高级管理研究项目

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.013

{"title":"The IRRADIA research project for the advanced management of infrastructures","authors":"","doi":"10.1016/j.prostr.2024.09.013","DOIUrl":"10.1016/j.prostr.2024.09.013","url":null,"abstract":"<div><div>AISICO and ‘Sapienza’ University of Rome are working on the project IRRADIA, a research program aiming to investigate the use of Artificial Intelligence for the structural assessment of railway and road infrastructures. The starting point is the BRIGHT method (BRIdGes Health Testing method, patented by AISICO), already applied on a large data set of information, and essentially based on the automatic detection of damages on structural elements of bridges and viaducts. The results carried out on 80 railway bridges provide new ideas to the sector of monitoring and control of existing infrastructures in terms of automatization. Then, the BRIGHT method, built on the railway specifications described by DOMUS, has been recently expanded to meet the requirements of the 2022 Italian Guidelines for existing road bridges and viaducts (DM 204, 1/07/2022). These require to fulfill several defect sheets for each structural element (e.g., beams, transversal beams, slabs, piers, abutments, supports, and so on), with a proper evaluation, for each defect, of type, extension and intensity. It follows that the damage evaluation requires usually a large number of operations with a high level of repetitiveness. Therefore, the use of AI techniques is a promising tool for the near future, to acquire and collect the images with unmanned aerial vehicle, from one hand, and to fulfill the defect sheets, from the other one, reducing time and cost. In this framework, one of the main goals of the cited IRRADIA research project is the investigation of the results obtained with the BRIGHT method extended to 2022 Italian Guidelines, that is, to road infrastructures. In this contribution the first results obtained on two bridges, the first in reinforced concrete and the second with a masonry structure, are presented and discussed.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Understanding the response of masonry arch bridges under different scour scenarios 了解圬工拱桥在不同冲刷情况下的反应

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.061

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Ground investigation: a tool for landslide risk mitigation of infrastructures 地面勘测：减轻基础设施滑坡风险的工具

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.075

{"title":"Ground investigation: a tool for landslide risk mitigation of infrastructures","authors":"","doi":"10.1016/j.prostr.2024.09.075","DOIUrl":"10.1016/j.prostr.2024.09.075","url":null,"abstract":"<div><div>Recent monitoring experiences for bridges in Central and South Italy have shown that it is not common for bridges to be directly damaged by landslides phenomena in their vicinities, either because their siting was very carefully selected at the origin or because appropriate protection measures have been taken to reduce geological risk to acceptable levels. In the first case, periodic visual inspections of the manufacts may suffice to monitor possible consequences of ground instability phenomena, but in the second case monitoring of the infrastructure and of the ground is the only possible tool to evaluate the existence of a landslide-structure interaction which can influence its performance and safety. Ground investigation is a fundamental activity for landslide monitoring and analysis, and this is specifically true when a landslide-infrastructure interaction problem needs to be investigated and assessed. By discussing the results from case studies recently inspected, this paper shows how the knowledge of the physical processes and the monitoring of selected parameters are the first irreplaceable tools to mitigate risks associated with instability phenomena interacting with sensitive infrastructures.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Interoperability between structural and geotechnical analysis for the study of safety in existing bridges 结构分析和岩土分析在研究现有桥梁安全方面的互操作性

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.070

{"title":"Interoperability between structural and geotechnical analysis for the study of safety in existing bridges","authors":"","doi":"10.1016/j.prostr.2024.09.070","DOIUrl":"10.1016/j.prostr.2024.09.070","url":null,"abstract":"<div><div>In recent years, the engineering community has shown a significant increase in interest in the field of soil-structure interaction. This problem is undoubtedly one of the most complex. Despite the exponential increase in computer performance in the last two decades, followed by the continuous development of numerical methods, the interaction between structural analysis programs and geotechnical issues remains limited. Specialized calculation codes for structural engineering and geotechnical engineering often operate independently. The reason for this separation lies in the highly specialized capabilities that a solver designed for geotechnical issues must possess. However, it remains crucial to incorporate the structural element within its geotechnical context, especially in the case of structures that are fully or partially embedded in the ground, such as tunnels, retaining walls, bridge abutments, and so on. There exists a mutual and reciprocal influence of the stress-strain state: the stiffness (and strength) of the foundation determines the response of the structure, which in turn affects the response of the foundation through its own stiffness. In many projects, there is an increasing demand to develop analyses that harness the full potential of both the structural and geotechnical aspects. Hence, there is a clear need to establish a connection between these two computational environments. The proposed solution involves the interaction of two programs: Midas Civil, an essential tool for structural engineers, and Flac 3D, a general-purpose software for geotechnical engineering. As explained further, this interaction is made possible thanks to the flexibility and openness of both software codes. Referring to a real case study of a road bridge with a superstructure consisting of reinforced concrete beams, this paper will illustrate the main challenges, significant steps, and undeniable advantages obtained through this approach.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Definition of direct and indirect types of landslide-bridge interference and a checklist for identifying and characterizing potential landslides 山体滑坡桥梁直接和间接干扰类型的定义，以及识别和描述潜在山体滑坡的清单

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.09.077

{"title":"Definition of direct and indirect types of landslide-bridge interference and a checklist for identifying and characterizing potential landslides","authors":"","doi":"10.1016/j.prostr.2024.09.077","DOIUrl":"10.1016/j.prostr.2024.09.077","url":null,"abstract":"<div><div>According to the new Italian Guidelines on existing bridges (LLG) the evaluation of the landslide susceptibility, vulnerability, and exposure, is based on the collection of the data necessary to fill the Field Sheet Form during the Periodic Field Surveys. Based on the knowledge and expertise gained during the inspections of the surrounding areas of a relevant number of existing bridges located in different geomorphological and geological contexts (i.e., Northern and Southern Apennines of Italy), the Authors recognized several difficulties in the accurate evaluation of the parameters to assess susceptibility and vulnerability according to LLG. In particular, the evaluation of the secondary parameters, namely <em>extent of the interference</em> and <em>overall reliability of the assessment</em>, depends greatly on the arbitrariness of the inspector. The main objectives of this work are: (a) to provide useful elements to distinguish between two types of landslide-bridge interference (direct and indirect) and evaluate the <em>extent of the interference</em> parameter (available options are: <em>Total, Partial</em>, and <em>Approach Zone</em>); (b) to propose an Additional Field Sheet Form aimed to improve the identification and characterization of Potential Landslides and to make more objective the self-evaluation of the inspector about the <em>overall reliability of the assessment</em> (two options: <em>good, limited</em>) of the primary parameters characterizing the landslide (<em>activity, velocity</em>, and <em>magnitude</em>).</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0