SDHM Structural Durability and Health Monitoring最新文献_第3页

Fatigue Performance of Orthotropic Steel Decks in Super-Wide Steel Box Girder Considering Transverse Distribution of Vehicle Load 考虑车辆荷载横向分布的超宽钢箱梁正交各向异性钢桥面疲劳性能

SDHM Structural Durability and Health Monitoring Pub Date : 2021-01-01 DOI: 10.32604/sdhm.2021.017526

Xudong Wang, C. Miao, Mao Yang, You-liang Ding

{"title":"Fatigue Performance of Orthotropic Steel Decks in Super-Wide Steel Box Girder Considering Transverse Distribution of Vehicle Load","authors":"Xudong Wang, C. Miao, Mao Yang, You-liang Ding","doi":"10.32604/sdhm.2021.017526","DOIUrl":"https://doi.org/10.32604/sdhm.2021.017526","url":null,"abstract":"This study presents an investigation on the fatigue analysis of four types of details on orthotropic steel decks (OSDs) for a cable-stayed super-wide steel box girder bridge based on finite-element analysis (FEA) with vehicle transverse distribution model (VTDM). A high-fidelity 3D FE model verified by the static load test is established to satisfy the fatigue analysis accuracy. The stress behavior of super-wide steel box girders under the vehicle load at different lane locations is investigated. Then, considering the effect of VTDM, the fatigue life analysis of four typical details is performed using the Miner cumulative damage rule. The results show that the vehicle transverse location has a great influence on the stress behavior of details with sharp influence surface, and the stress ranges in the outermost lane are larger than those in other lanes, indicating that the details of OSD in the outermost lane are prone to fatigue. The fatigue life analysis indicates that the diaphragm cutout is more prone to fatigue than other details, which should be carefully treated in bridge maintenance.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69903203","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

Research on Reconstruction Technology of Flexible Structure Shape Based on FBG Sensor Array and Deep Learning Algorithm 基于FBG传感器阵列和深度学习算法的柔性结构形状重构技术研究

SDHM Structural Durability and Health Monitoring Pub Date : 2021-01-01 DOI: 10.32604/sdhm.2022.018202

K. Huang, Jie Yan, Lei Zhang, Faye Zhang, Mingshun Jiang, Q. Sui

引用次数: 0

Finite Element Model Updating for Structural Health Monitoring 结构健康监测的有限元模型更新

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.08792

A. Haidarpour, K. Tee

{"title":"Finite Element Model Updating for Structural Health Monitoring","authors":"A. Haidarpour, K. Tee","doi":"10.32604/sdhm.2020.08792","DOIUrl":"https://doi.org/10.32604/sdhm.2020.08792","url":null,"abstract":"This paper provides a model updating approach to detect, locate, and characterize damage in structural and mechanical systems by examining changes in measured vibration responses. Research in vibration-based damage identification has been rapidly expanding over the last few decades. The basic idea behind this technology is that modal parameters (notably frequencies, mode shapes, and modal damping) are functions of the physical properties of the structure (mass, damping, and stiffness). Therefore, changes in the physical properties will cause changes in the modal properties which could be obtained by structural health monitoring (SHM). Updating is a process fraught with numerical difficulties. These arise from inaccuracy in the model and imprecision and lack of information in the measurements, mainly taken place in joints and critical points. The motivation for the development of this technology is presented, methods are categorized according to various criteria such as the level of damage detection provided from vibration testing, natural frequency and mode shape readings are then obtained by using modal analysis techniques, which are used for updating structural parameters of the associated finite element model. The experimental studies for the laboratory tested bridge model show that the proposed model updating using ME’scope technique can provide reasonable model updating results.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901545","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: 9

Long-Term Bending Behaviour of Prestressed Glulam Bamboo-Wood BeamBased on Creep Effect 基于徐变效应的预应力胶合竹木梁长期弯曲性能

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.09104

Guo Nan, Huajing Xiong, Mingtao Wu, Hongliang Zuo, Feng Jiang, Xiaofeng Hou, D. Xin

{"title":"Long-Term Bending Behaviour of Prestressed Glulam Bamboo-Wood Beam\u0000Based on Creep Effect","authors":"Guo Nan, Huajing Xiong, Mingtao Wu, Hongliang Zuo, Feng Jiang, Xiaofeng Hou, D. Xin","doi":"10.32604/sdhm.2020.09104","DOIUrl":"https://doi.org/10.32604/sdhm.2020.09104","url":null,"abstract":": Creep is an important characteristic of bamboo and wood materials under long-term loading. This paper aims to study the long-term bending behaviour of prestressed glulam bamboo-wood beam (GBWB). For this, 14 pre-stressed GBWBs were selected and subjected to a long-term loading test for 60 days. Then, a comparative analysis was performed for the effects of pretension values, the number of pre-stressed wires, and long-term load on the stress variation of the steel wire and the long-term de ﬂ ection of the beam midspan. The test results showed that with the number of prestressed wires increasing, the total stress of the steel wire in the beam midspan and the ratio of the long-term de ﬂ ection to the total de ﬂ ection decreases decreased, but when the number of steel wires exceeded 4, the total stress and long-term de ﬂ ection was less in ﬂ uenced; with the pre-tension value increasing, the ratio of the total stress of the steel wire in the beam midspan and the ratio of the long-term de ﬂ ection to the total de ﬂ ection also decreased, but when the prestress force was greater than 3.975 kN, the total stress and long-term de ﬂ ection were less affected; with the other parameters unchanged, when the value of the long-term load increased, the total stress of the steel wire decreased, and the long-term de ﬂ ection of the beam midspan increased, which shall be more signi ﬁ cant with the long-term load greater than 30% of the standard ultimate bearing capacity. After the test, the experimental data were ﬁ tted, and the creep coef ﬁ cient was given. Finally, the long-term stiffness calculation formula of the pre-stressed GBWB based on creep effect was proposed. The research ﬁ ndings have certain theoretical signi ﬁ cance and engineering value.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901632","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: 5

Research on Concrete Beam Crack Recognition Algorithm Based on BlockThreshold Value Image Processing 基于块阈值图像处理的混凝土梁裂缝识别算法研究

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.011479

Wenting Qiao, Xiaoguang Wu, Wen Sun, Qiande Wu

{"title":"Research on Concrete Beam Crack Recognition Algorithm Based on Block\u0000Threshold Value Image Processing","authors":"Wenting Qiao, Xiaoguang Wu, Wen Sun, Qiande Wu","doi":"10.32604/sdhm.2020.011479","DOIUrl":"https://doi.org/10.32604/sdhm.2020.011479","url":null,"abstract":": To solve the problem that the digital image recognition accuracy of concrete structure cracks is not high under the condition of uneven illumination and complex surface color of concrete structure, this paper has proposed a block segmentation method of maximum entropy threshold based on the digital image data obtained by the ACTIS automatic detection system. The steps in this research are as follows: 1. The crack digital images of concrete specimens with typical features were collected by using the Actis system of KURABO Co., Ltd., of Japan in the concrete beam bending test. 2. The images are segmented into blocks to distinguish backgrounds of different grayscale. 3. The maximum interclass average gray difference method is used to distinguish the sub-blocks and screen out the image blocks that need to be segmented. 4. Segmentation is made to the image with 2D maximum entropy threshold segmentation method to obtain the binary image, and the target image can be obtained by screening the connected domain features of the binary image. Results have shown that compared with other algorithms, the proposed method can effectively decrease the image over-segmentation and under segmentation rates, highlight the characteristics of the target cracks, solve the problems of excessive difference between the identi ﬁ ed length and actual length of cracks caused by background gray level change and uneven illumination, and effectively improve the recognition accuracy of bridge concrete cracks.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901294","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

A Deep Learning Based Approach for Response Prediction of Beam-likeStructures 基于深度学习的类梁结构响应预测方法

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.010564

Tianyu Wang, Wael A. Altabey, M. Noori, Ramin Ghiasi

引用次数: 22

Fatigue Performance Evaluation for Welded Details in Orthotropic Steel DeckBridges Using Multi-Scale Finite Element Method 基于多尺度有限元法的正交各向异性钢甲板桥焊接细部疲劳性能评价

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.08997

R. Chen, C. Miao

{"title":"Fatigue Performance Evaluation for Welded Details in Orthotropic Steel Deck\u0000Bridges Using Multi-Scale Finite Element Method","authors":"R. Chen, C. Miao","doi":"10.32604/sdhm.2020.08997","DOIUrl":"https://doi.org/10.32604/sdhm.2020.08997","url":null,"abstract":"In order to study the fatigue properties of rib-to-deck welded connection and rib-to-rib welded connection in orthotropic steel bridge decks, a multi-scale finite element model was set up to analyze the stress distribution characteristics and the load test was conducted on the Taizhou Yangtze River Bridge. Comparing the vehicle test results with the multi-scale finite element model results to verify the accuracy of the finite element simulation for the stress response of two welded details. The results indicated that: The stress at the rib-to-deck welded connection and the rib-to-rib welded connection are the bending stress and the membrane stress, respectively; the stress response of the two welded connection has strong local characteristics; the lateral stress influence line of the two welded connection is relatively short and the length of the lateral stress influence line is greatly affected by the longitudinal ribs; increasing the thickness of the roof and longitudinal ribs can reduce the stress response and improve the stress performance of the heavy lanes. For the two welded details, the fatigue damage increment of the ordinary lane is greater than the heavy lane. The thickened roof and longitudinal ribs at the position of the heavy lane still cannot balance the fatigue damage caused by the heavy truck. Therefore, it is necessary to strictly control the fatigue effect of overloaded vehicles on steel box girders.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901592","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

Influencing Factors of Load Carrying Capacity and Cooperative Work Laws ofMetro Uplift Piles 地铁拔桩承载力影响因素及协同工作规律

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.06482

Bo Liu, Haoran Li, Shuya Liu

{"title":"Influencing Factors of Load Carrying Capacity and Cooperative Work Laws of\u0000Metro Uplift Piles","authors":"Bo Liu, Haoran Li, Shuya Liu","doi":"10.32604/sdhm.2020.06482","DOIUrl":"https://doi.org/10.32604/sdhm.2020.06482","url":null,"abstract":": The buoyancy of groundwater can reduce the foundation bearing capacity and cause the metro tunnels to ﬂ oat as a whole, which threatens the safety of structures seriously. Therefore, uplift piles are set up to improve the structural sta-bility. In this paper, FLAC3D software is used to establish the calculation models of pile foundation. The bearing failure process of uplift piles was simulated to study the in ﬂ uencing factors on single pile load bearing capacity as well as the cooperative work laws of pile groups. The load-displacement curves of pile top under different length-diameter ratios, pile-soil interface characteristics and pile types are obtained, respectively. The results showed that, increasing the length-diameter ratio and the pile-soil interface roughness properly can improve the bearing capacity of uplift piles. Besides, changing the shapes of constant pile section can also improve it, which has the most signi ﬁ cant effect concerning of saving material cost. In the loading process of pile groups, the ultimate bearing capacity of corner pile is the biggest, the side pile is the next, and the center pile is the smallest. The deformation characteristics of pile top are as follows: the center pile is the biggest, the side pile is the next, and corner pile is the smallest. Combined with the results, the uplift resistance of group piles can be enhanced pertinently, and the conclusions provide guidance for the design and construction of uplift piles in the actual engineer.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901792","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

Experimental Study on Permeability Characteristics of Geotubes for SeepageAnalysis on Safety Assessment of Dams 土工管渗水渗透特性试验研究

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.011009

Xiao-lei Man, Ganggang Sha, Shuigen Hu, H. Bao, Guangying Liu

{"title":"Experimental Study on Permeability Characteristics of Geotubes for Seepage\u0000Analysis on Safety Assessment of Dams","authors":"Xiao-lei Man, Ganggang Sha, Shuigen Hu, H. Bao, Guangying Liu","doi":"10.32604/sdhm.2020.011009","DOIUrl":"https://doi.org/10.32604/sdhm.2020.011009","url":null,"abstract":": Geotubes are heterogeneous structures composed of ﬁ lling sand and bag material, and its permeability characteristics are different from that of ﬁ lling sand. The uncertainty of geotubes permeability characteristics results in the failure of seepage analysis of geotube dams, which restricts the safety assessment of the dams. As the basis of the study on the seepage mechanism of the geotubes, the in ﬂ uence of particle grading on permeability coef ﬁ cient of ﬁ lling sand and sand covered with geotextiles were explored by the permeability tests of ﬁ lling sand with different particle grading under the condition of sand covered with or without geotextiles. And the in ﬂ uence of geotextiles on the permeability coef ﬁ cient was analyzed by comparing permeability coef ﬁ cient of sand covered with and without geotextiles. The test results show that the in ﬂ uence of single particle size content on permeability coef ﬁ cient is consistent under the condition of sand covered with and without geotextiles. The content of powder, ﬁ ne, medium and coarse particles is linearly related to their respective permeability coef ﬁ cients. And the content of powder, ﬁ ne, medium particles is negatively correlated with their permeability coef ﬁ cients, while the content of coarse particles is positively correlated with the permeability coef ﬁ cient. But the permeability coef ﬁ cient of sand covered with geotextiles is smaller than that of ﬁ lling sand under the same conditions. Finally, the parameter d 250 C c C u was selected as a variable representing the particle grading to ﬁ t the empirical formula of permeability coef ﬁ cient of ﬁ lling sand and sand covered with geotextiles.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901126","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

Characteristics on Seawater Corrosion of Intensely Weathered SurroundingRock of Subsea Tunnel 海底隧道强风化围岩海水腐蚀特性研究

SDHM Structural Durability and Health Monitoring Pub Date : 2020-01-01 DOI: 10.32604/sdhm.2020.07619

Peishuai Chen, Jun-jie Cao, Wei-zhong Chen, W. Rao

引用次数: 0