Frattura ed Integrità Strutturale最新文献

Correlation coefficients of vibration signals and machine learning algorithm for structural damage assessment in beams under moving load 振动信号相关系数和机器学习算法用于移动荷载下梁的结构损伤评估

Frattura ed Integrità Strutturale Pub Date : 2024-07-16 DOI: 10.3221/igf-esis.70.03

Toan Pham Bao, Vien Le-Ngoc

{"title":"Correlation coefficients of vibration signals and machine learning algorithm for structural damage assessment in beams under moving load","authors":"Toan Pham Bao, Vien Le-Ngoc","doi":"10.3221/igf-esis.70.03","DOIUrl":"https://doi.org/10.3221/igf-esis.70.03","url":null,"abstract":"This paper presents a novel method of assessing structural damage in beams exposed to moving loads via acceleration signals through experimental studies. In this study, beams are supported on both ends, and their dynamic response to moving loads is assessed. The raw signal has been improved using a random decrement technique. Take measurements from different locations and calculate correlation coefficients between them, then use these as features to evaluate the structure. In order to create a reliable and potential framework for predicting damage efficiently, these features are used as input variables to the machine learning model. The proposed methodology exhibits promising results in accurately discerning and predicting damage in beam structure. It demonstrates a high level of precision to subtle changes in structural integrity when trained by machine learning on the statistical feature extracted from acceleration signals. As a result of this research, methods for detecting structural damage can be made more reliable and efficient by employing machine learning techniques. Additionally, structures operating in dynamic environments can benefit significantly from the proposed methodology.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"18 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141644292","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

Introduction and application of a drive-by damage detection methodology for bridges using variational mode decomposition 利用变异模式分解的桥梁驱动损坏检测方法的介绍和应用

Frattura ed Integrità Strutturale Pub Date : 2024-07-09 DOI: 10.3221/igf-esis.70.02

Shahrooz Khalkhali Shandiz, Hamed Khezrzadeh, Saeed Eftekhar Azam

{"title":"Introduction and application of a drive-by damage detection methodology for bridges using variational mode decomposition","authors":"Shahrooz Khalkhali Shandiz, Hamed Khezrzadeh, Saeed Eftekhar Azam","doi":"10.3221/igf-esis.70.02","DOIUrl":"https://doi.org/10.3221/igf-esis.70.02","url":null,"abstract":"In this research, the variational mode decomposition (VMD) method is used for the drive-by health monitoring of bridges. Firstly, the problem of a half-trailer tractor moving over a bridge is formulated. Next, a Finite Element (FE) code is developed and verified against modal analysis results where complete agreement is found. The vehicle's output signals are decomposed through VMD and then analyzed to identify and precisely locate damage in the bridge structure. The range of applicability of this technique is examined from different perspectives by including various road classes, damage severity and location, and noise. The results prove the robustness and reliability of using VMD for drive-by damage detection. The method outcomes indicate that through the VMD method, cracks with a depth of 10% to 20% of the beam height can be detected even in the case of a rough road profile. A comparison of the results of the VMD and the well-known empirical mode decomposition (EMD) method has also been conducted. This comparison reveals that by implementing the VMD, precise damage locations can be determined, whereas the EMD fails to detect any damage under the conditions considered in this study. The effects of noise and moving vehicle speed are also investigated in the research, and it is found that processing the output signals using VMD can yield reliable estimates of the damage location(s).","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"70 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664439","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

Predicting Damage in Notched Functionally Graded Materials Plates through extended Finite Element Method based on computational simulations 通过基于计算模拟的扩展有限元法预测缺口功能分级材料板的损伤

Frattura ed Integrità Strutturale Pub Date : 2024-07-03 DOI: 10.3221/igf-esis.70.01

Hakim Siguerdjidjene, Amin Houari, K. Madani, Salah Amroune, Mohamed Mokhtari, Barhm Mohamad, Chellil Ahmed, Abdelkrim Merah, Raul Campilho

{"title":"Predicting Damage in Notched Functionally Graded Materials Plates through extended Finite Element Method based on computational simulations","authors":"Hakim Siguerdjidjene, Amin Houari, K. Madani, Salah Amroune, Mohamed Mokhtari, Barhm Mohamad, Chellil Ahmed, Abdelkrim Merah, Raul Campilho","doi":"10.3221/igf-esis.70.01","DOIUrl":"https://doi.org/10.3221/igf-esis.70.01","url":null,"abstract":"Presently, Functionally Graded Materials (FGMs) are extensively utilised in several industrial sectors, and the modelling of their mechanical behaviour is consistently advancing. Most studies investigate the impact of layers on the mechanical characteristics, resulting in a discontinuity in the material. In the present study, the extended Finite Element Method (XFEM) technique is used to analyse the damage in a Metal/Ceramic plate (FGM-Al/SiC) with a circular central notch. The plate is subjected to a uniaxial tensile force. The maximum stress criterion was employed for fracture initiation and the energy criterion for its propagation and evolution. The FGM (Al/SiC) structure is graded based on its thickness using a modified power law. The plastic characteristics of the structure were estimated using the Tamura-Tomota-Ozawa (TTO) model in a user-defined field variables (USDFLD) subroutine. Validation of the numerical model in the form of a stress-strain curve with the findings of the experimental tests was established following a mesh sensitivity investigation and demonstrated good convergence. The influence of the notch dimensions and gradation exponent on the structural response and damage development was also explored. Additionally, force-displacement curves were employed to display the data, highlighting the fracture propagation pattern within the FGM structure.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"11 2‐3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141682474","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

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks 有初始裂缝的钢筋轻质混凝土板的行为

Frattura ed Integrità Strutturale Pub Date : 2024-05-11 DOI: 10.3221/igf-esis.69.13

Mustafa Khadim, Abdulkhalik Abdulridha

{"title":"Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks","authors":"Mustafa Khadim, Abdulkhalik Abdulridha","doi":"10.3221/igf-esis.69.13","DOIUrl":"https://doi.org/10.3221/igf-esis.69.13","url":null,"abstract":"The flexural behavior of lightweight concrete two-way slabs repaired or strengthened with externally bonded carbon fiber-reinforced polymer (CFRP) sheets is the subject of this study. The experiment included five reinforced lightweight concrete slab specimens with dimensions of 1000 mm in length, 1000 mm in width, and 120 mm in thickness. Tested one specimen without any strengthening and reinforced another specimen with a single layer of CFRP. The other specimens were repaired with a single layer of CFRP, applying damage ratios of 50%, 60%, or 70% of the ultimate load. Intentionally designed each slab to collapse under bending forces and maintained comparable dimensions. According to the experiment results, changing the degree of damage from 70% to 50% increases the ultimate load capacity by about 17.7%, and the ultimate deflection decreases by about 31.4%. CFRPs have the potential to fix structural damage under static stress testing conditions. However, it is essential to make sure that they stick well to surfaces that do not have suitable geometric properties or have been deformed. CFRP sheets effectively repaired the specimens, increasing the failure stress of the reinforced concrete slabs and preventing the spread of cracks.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":" 1264","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140988907","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

A Numerical Study on Predicting Bond-Slip Relationship of Reinforced Concrete using Surface Based Cohesive Behavior 利用基于表面的粘性行为预测钢筋混凝土粘结-滑移关系的数值研究

Frattura ed Integrità Strutturale Pub Date : 2024-05-10 DOI: 10.3221/igf-esis.69.12

Minhajul Bari Prince Minhajul Bari Prince, Debasish Sen Debasish Sen

{"title":"A Numerical Study on Predicting Bond-Slip Relationship of Reinforced Concrete using Surface Based Cohesive Behavior","authors":"Minhajul Bari Prince Minhajul Bari Prince, Debasish Sen Debasish Sen","doi":"10.3221/igf-esis.69.12","DOIUrl":"https://doi.org/10.3221/igf-esis.69.12","url":null,"abstract":"Overall structural integrity and load transfer between concrete and reinforcement enabling composite action relies on the bond between concrete and reinforcement. Bond strength determination of reinforced concrete is an essential task that a pullout test can determine. Experimental pullout behaviour can be affected by various parameters, such as concrete and steel strength, boundary conditions, etc. Therefore, a parametric study on pullout tests is time-consuming. In addition, measurements of internal stress-strain components and damages of constitutive materials are also difficult in experimental endeavours. In this context, finite element (FE) models should be developed to perform a parametric study with cost and time-saving. This study proposes a finite element modeling strategy of reinforced concrete under pullout force by using the expected failure mechanism to predict bond-slip behaviour in ABAQUS. In FE models, surface-to-surface cohesive interaction behaviour was used to assign interaction between reinforcement and concrete. The proposed modelling strategy was validated with available experimental data from four reference specimens, having all possible failures (i.e., pullout, splitting, and splitting-pullout) under pullout loading. The finite element analysis showed that the proposed FE modeling strategy performed well in predicting bond-slip behaviour in elastic regions. Additionally, maximum bond stresses were predicted satisfactorily, except for the splitting failure pattern, using the proposed FE modelling strategy.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":" 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140992072","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

Methodology to minimize the dynamic response of tall buildings under wind load controlled through semi-active magneto-rheological dampers 通过半主动磁流变阻尼器控制风荷载下高层建筑动态响应最小化的方法

Frattura ed Integrità Strutturale Pub Date : 2024-04-25 DOI: 10.3221/igf-esis.69.07

Francisco da Silva Brandão, Alex Koch de Almeida, Letícia Fleck Fadel Miguel

{"title":"Methodology to minimize the dynamic response of tall buildings under wind load controlled through semi-active magneto-rheological dampers","authors":"Francisco da Silva Brandão, Alex Koch de Almeida, Letícia Fleck Fadel Miguel","doi":"10.3221/igf-esis.69.07","DOIUrl":"https://doi.org/10.3221/igf-esis.69.07","url":null,"abstract":"This paper proposes a methodology to evaluate and optimize the dynamic response of tall buildings under wind loading, controlled through semi-active Magneto-Rheological dampers (MR dampers). For this, a tall building, modeled as a 2D frame, is taken as case study and three structural control configurations are proposed. The original structural configuration of the building is the first configuration analyzed, called Uncontrolled Original (C1). In the second configuration, called Uncontrolled Optimized (C2), the fundamental frequency of the building is optimized via PSO algorithm as a function of its mass. Then, in the third configuration, Controlled Optimized (C3), a set of MR dampers with behavior formulated via the modified Bouc-Wen rheological model and controlled through the Linear Quadratic Regulator associated with the Clipped Optimal control strategy (LQR-CO) is applied to the structure. Finally, the dynamic response of the three scenarios under wind action is analyzed and compared to performance criteria established in the literature. The results demonstrate that the C3 configuration is the only one able of satisfying all the established performance criteria, proving that the proposed methodology y that combines structural optimization with MR dampers is a powerful tool for vibration control.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"91 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140654795","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

Effectiveness of Partial Wrapping of Stainless-Steel Wire Mesh on Compression Behavior of Concrete Cylinders 部分包裹不锈钢丝网对混凝土圆柱体压缩行为的影响

Frattura ed Integrità Strutturale Pub Date : 2024-04-20 DOI: 10.3221/igf-esis.69.06

S. Raiyani, Paresh Patel, S. S. Prakash

{"title":"Effectiveness of Partial Wrapping of Stainless-Steel Wire Mesh on Compression Behavior of Concrete Cylinders","authors":"S. Raiyani, Paresh Patel, S. S. Prakash","doi":"10.3221/igf-esis.69.06","DOIUrl":"https://doi.org/10.3221/igf-esis.69.06","url":null,"abstract":"Partial confinement can provide sufficient reinforcement to enhance the compressive strength and ductility of concrete with lesser confining material. This paper presents the results of an axial compression test conducted on eighteen plain concrete cylinders of 150 mm diameter and 300 mm height partially confined with a Stainless-Steel Wire Mesh (SSWM) strip of different widths. The study included two specimens without wrapping, two fully wrapped specimens, and others wrapped with two SSWM strips of varying widths at both the ends of concrete cylinder. The strain on SSWM up to failure is measured to understand the effectiveness of lateral confining pressure on the behaviour of concrete cylinders. The peak axial compressive strength and corresponding strain of unconfined and SSWM-confined concrete cylinders are compared. The result shows a significant increase in peak confined compressive stress as compared to an unconfined concrete cylinder. However, the confinement efficiency is reduced when the height of the unconfined region exceeds the diameter of the cylinder, and significant strain localisation is detected within the unwrapped region. Based on experimental investigation, a confinement coefficient is suggested for a partial wrapping of SSWM on the concrete cylinder.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":" 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140681401","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

The influence of technological defects on the mechanical behavior of CFRP during buckling under compression based on DIC data and acoustic emission 基于 DIC 数据和声发射的技术缺陷对 CFRP 压缩屈曲过程中力学行为的影响

Frattura ed Integrità Strutturale Pub Date : 2024-04-19 DOI: 10.3221/igf-esis.69.05

Stanislav Slovikov, Dmitriy Lobanov, E. Chebotareva, Valeria Melnikova

引用次数: 0

Experimental Investigations on Physical and Mechanical Properties of Hybrid Bamboo Composites 混合竹复合材料物理和机械性能的实验研究

Frattura ed Integrità Strutturale Pub Date : 2024-04-17 DOI: 10.3221/igf-esis.69.03

Anand K J, Thippeswamy Ekbote

{"title":"Experimental Investigations on Physical and Mechanical Properties of Hybrid Bamboo Composites","authors":"Anand K J, Thippeswamy Ekbote","doi":"10.3221/igf-esis.69.03","DOIUrl":"https://doi.org/10.3221/igf-esis.69.03","url":null,"abstract":"The present study aims to develop a novel hybrid composite by incorporating clamshell as a secondary reinforcing filler into a bamboo-epoxy composite. The primary objective of this hybridization is to optimize the synergistic benefits of each component, harnessing the strength of bamboo fibres, the durability of epoxy, and the cost-effective repurposing of the waste clamshell. Compression moulding was employed to develop composites with varying filler content (0- 9 wt%). The effect of filler on the physical and mechanical properties of bamboo-epoxy composites was evaluated by conducting tests as per ASTM standards. Experimental results show that the addition of clamshell filler significantly improved composites' properties, but there was a limitation to the addition. Hardness, tensile, and flexural properties were increased, whereas impact strength was reduced. Composites with 6 wt% clamshell exhibited optimum properties, enhancing tensile strength by 20.5% and flexural strength by 24.4 % compared to composites without filler. SEM analysis of fractured tensile and bending specimens revealed an enhanced fibre-matrix bonding with the inclusion of filler and supported the experimental results obtained. The outcome of this study contributes to sustainable development by using natural resources like bamboo fibre and repurposing seashell waste to create cost-effective composite material with enhanced properties.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"122 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140694398","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

Civil Structural Health Monitoring and Machine Learning: A Comprehensive Review 土木结构健康监测与机器学习：全面回顾

Frattura ed Integrità Strutturale Pub Date : 2024-04-17 DOI: 10.3221/igf-esis.69.04

Asraar Anjum, M. Hrairi, Abdul Aabid, N. Yatim, Maisarah Ali

{"title":"Civil Structural Health Monitoring and Machine Learning: A Comprehensive Review","authors":"Asraar Anjum, M. Hrairi, Abdul Aabid, N. Yatim, Maisarah Ali","doi":"10.3221/igf-esis.69.04","DOIUrl":"https://doi.org/10.3221/igf-esis.69.04","url":null,"abstract":"In the past five years, the implementation of machine learning (ML) techniques has surged in civil engineering applications, particularly for optimizing and predicting solutions to various challenges. More robust prediction models may be produced by combining test data collected in the laboratory or field with ML. These models may be used to estimate the compressive strength of masonry or repair mortars, probable damage scenarios in buildings, concrete models, beams, and columns for determining the mechanical characteristics of materials, damage detection in civil structures, and so on. This comprehensive review aims to clarify the array of ML-based methods employed in civil engineering, specifically focusing on their efficacy in strengthening energy efficiency and cost-effectiveness. In combination with ML, the review explores corresponding soft computing methodologies such as fuzzy logic (FL) and design of experiments (DOE). A variety of case examples that highlight the versatility of these approaches, particularly in applications linked to structural reinforcement, enhance the story. The review navigates difficulties associated with the integration of soft computing in civil engineering and expands its scope to include emerging research directions. This synthesis of advanced artificial intelligence (AI) serves as a guide, providing new researchers with knowledge about a developing field. These methods could revolutionize the current situation by providing creative answers to complex problems that arise in civil structural applications.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140690990","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