International Journal of Steel Structures最新文献_第4页

Nominal Flexural Strength of Thin-walled Steel Girders with Deviators Pre-stressed by Rectilinear Cables

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-10-01 DOI: 10.1007/s13296-024-00901-z

Agha Intizar Mehdi, Moon-Young Kim

引用次数: 0

Investigating Corrosive Environmental Factors and Corrosion Rate to Assess Vulnerable Corrosive Areas of Offshore Bridges

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-30 DOI: 10.1007/s13296-024-00903-x

Jun-Seok Park, Min-Gyun Ha, Hoon Yoo, Jin-Hee Ahn

{"title":"Investigating Corrosive Environmental Factors and Corrosion Rate to Assess Vulnerable Corrosive Areas of Offshore Bridges","authors":"Jun-Seok Park, Min-Gyun Ha, Hoon Yoo, Jin-Hee Ahn","doi":"10.1007/s13296-024-00903-x","DOIUrl":"10.1007/s13296-024-00903-x","url":null,"abstract":"<div><p>In this study, to analyze the corrosive vulnerable members of an offshore bridge, the corrosive environments and corrosion rate were evaluated according to the installation location. The steel box deck bridge was selected as the target bridge for analyzing corrosive vulnerable members, and the corrosive environment and corrosion rate of the stiffened sections were compared. Based on the assessment results of the corrosive environment, varying corrosion rates were observed depending on the installation location of the sections, with the sections located at the bottom of the pylon showing a faster corrosion rate. Furthermore, it was established that structural members with accumulated surface chloride of 50 mg/m<sup>2</sup> or more could experience accelerated corrosion, as evidenced by the correlation between the corrosive environment and corrosion rate. The side parts of the sections positioned at the bottom of the pylon received a C4 rating, signifying a higher susceptibility to corrosion than the bottom parts. From these monitoring results, it was confirmed that the relative difference in the corrosion rate of stiffened members, and considering the relative corrosive environments. Considering these differences in the corrosive environments, it is necessary to the maintenance for steel members in offshore bridges.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 1","pages":"189 - 203"},"PeriodicalIF":1.1,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stochastic Robustness of Cable Dome Structures Under Impact Loads 缆索穹顶结构在冲击荷载下的随机鲁棒性

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-25 DOI: 10.1007/s13296-024-00885-w

Lian-meng Chen, Ben-cheng Huang, Yi-hong Zeng, Sun-kai Yan, Wei Li, Yi-yi Zhou, Shi-lin Dong

{"title":"Stochastic Robustness of Cable Dome Structures Under Impact Loads","authors":"Lian-meng Chen, Ben-cheng Huang, Yi-hong Zeng, Sun-kai Yan, Wei Li, Yi-yi Zhou, Shi-lin Dong","doi":"10.1007/s13296-024-00885-w","DOIUrl":"10.1007/s13296-024-00885-w","url":null,"abstract":"<div><p>Previous studies have rarely investigated stochastic robustness of flexible cable dome structures under impact loads. In this study, the dynamic responses and failure modes of a Geiger cable dome structure were analysed under impact loads. The number of components damaged by impact and the loss of internal force in components were used to establish a structural damage index and an equation of failure mode control. Following this, by establishing the impact resistance failure limit state equation and combining the probabilistic and statistical characteristics of each design parameter of the structure, the probability of disproportionate failure of the structure undergoing disproportional damage under the impact load was calculated. Then, the stochastic robustness index <span>({I}_{text{rob}})</span> based on the probability of structural failure was proposed, and the key factors affecting the structural robustness were analysed through parameter analysis. The research results indicated the following. First, cable dome structures exhibited three types of failure modes under impact loads. Second, the stochastic robustness index fully reflected the probability of a cable dome structure sustaining disproportional damage under impact loads. Increasing the mass or speed of the impactor both increased the probability of the structure sustaining disproportional damage. An impact occurred closer to the centre of the structure, both the probability of overall structural failure and structural robustness performance increase, but the probability of the structure sustaining disproportional damage decreases. Third, increasing the prestress and cross-sectional area of the components might increase their impact resistance and structural robustness performance.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"24 5","pages":"1217 - 1228"},"PeriodicalIF":1.1,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on Initial Corrosion Behavior of Arc-thermally Spray Zn, Zn–Al, and Al–Mg Coatings Exposed in Atmospheric Environment for One-Year 电弧热喷涂Zn、Zn - al和Al-Mg涂层在大气环境中暴露一年的初始腐蚀行为研究

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-20 DOI: 10.1007/s13296-024-00893-w

Atsushi Nakano, Yuki Toyota, Chihiro Morita, Kentaro Yasui, Wataru Oshikawa, Noboru Yonezawa

{"title":"Study on Initial Corrosion Behavior of Arc-thermally Spray Zn, Zn–Al, and Al–Mg Coatings Exposed in Atmospheric Environment for One-Year","authors":"Atsushi Nakano, Yuki Toyota, Chihiro Morita, Kentaro Yasui, Wataru Oshikawa, Noboru Yonezawa","doi":"10.1007/s13296-024-00893-w","DOIUrl":"10.1007/s13296-024-00893-w","url":null,"abstract":"<div><p>This paper presents the results of a study comparing the initial corrosion characteristics of thermal spray coatings on Zn, Zn-Al, and Al–Mg thermal spray coatings after one year atmospheric exposure tests at two atmospheric environment sites. The thermal spray coatings were obtained by electroric arc spraying of various metals onto a carbon steel substrate. Atmospheric exposure tests were also conducted for outdoor accelerated exposure tests in which test specimens were applied with artificial seawater. The corrosion properties of these spray coatings were evaluated by surface analysis, film thickness measurements, cross-sectional analysis and anodic/cathodic polarization measurement. After one year of atmospheric exposure testing, white, granular corrosion products were observed on the surface of the Zn and Zn-Al thermal spray coatings, while no significant changes were observed in the Al–Mg thermal spray coating. Similar results were obtained for the surfaces of test specimens in atmospheric exposure tests with artificial seawater. The thickness of the thermal spray coating increased for the Zn thermal spray coating, while no significant change was observed for the other thermal spray coatings. Thus, differences in corrosion behavior were observed due to the composition of the thermal spray coatings. The initial corrosion behavior of the thermal spray coatings was also investigated based on the results of coating morphology and cross-sectional elemental distribution of the coatings.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"24 6","pages":"1395 - 1405"},"PeriodicalIF":1.1,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13296-024-00893-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Finite Element Modeling for Concrete-Filled Steel Tube Stub Columns Under Axial Compression 轴向压缩下混凝土填充钢管支柱的有限元建模

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-18 DOI: 10.1007/s13296-024-00896-7

Khaled Megahed, Nabil Said Mahmoud, Saad Elden Mostafa Abd-Rabou

{"title":"Finite Element Modeling for Concrete-Filled Steel Tube Stub Columns Under Axial Compression","authors":"Khaled Megahed, Nabil Said Mahmoud, Saad Elden Mostafa Abd-Rabou","doi":"10.1007/s13296-024-00896-7","DOIUrl":"10.1007/s13296-024-00896-7","url":null,"abstract":"<div><p>Concrete-filled steel tube (CFST) columns exhibit remarkable structural performance due to the combined effects of lateral confinement provided by the steel tube and the capacity of the core concrete to delay steel local buckling. This interaction enhances the axial capacity, peak-load strain, and ductility behavior of CFST columns. However, accurately modeling CFST stub columns using finite element (FE) simulations is a challenging task, requiring accurate representation of concrete behavior under tri-axial stress conditions. The concrete damaged plasticity (CDP) model in ABAQUS software is commonly used but has limitations, particularly for confined concrete. In addition, most introduced confinement models are constrained by the type of confining material and column dimensions. This study addresses these limitations by introducing an enhanced CDP model that properly accounts for the hardening/softening rule, yielding surface, and flow rule. In addition, a new confinement ratio is proposed for steel-confined concrete columns to calculate the dilation angle. The suggested model was validated through FE analysis on 1041 previously tested CFST stub columns. It was found that the proposed model successfully predicts load–strain curves and axial capacity for various cross-section shapes and confinement levels.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"24 5","pages":"1229 - 1250"},"PeriodicalIF":1.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fire Behaviour of Rectangular Steel Tubed-Reinforced-Concrete Columns with End Restraints 带端部约束的矩形钢管加固混凝土柱的火灾行为

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-18 DOI: 10.1007/s13296-024-00898-5

Dongdong Yang, Faqi Liu, Shan-Shan Huang, Hua Yang, Kun Wang

{"title":"Fire Behaviour of Rectangular Steel Tubed-Reinforced-Concrete Columns with End Restraints","authors":"Dongdong Yang, Faqi Liu, Shan-Shan Huang, Hua Yang, Kun Wang","doi":"10.1007/s13296-024-00898-5","DOIUrl":"10.1007/s13296-024-00898-5","url":null,"abstract":"<div><p>The steel tubed-reinforced-concrete (STRC) column is a new form of composite column, in which the steel tube primarily serves to provide confinement to concrete core rather than directly carrying axial force. The restraining effects at the heated column ends should be incorporated into the fire performance design of STRC columns, while current research on rectangular STRC columns is still inadequate. This study presents the numerical study on the fire behaviour of end-restrained rectangular STRC columns. The effects of axial restraint and rotational restraint on the overall deformations, internal forces, fire resistance, axial force and buckling length at fire limit state, of rectangular STRC columns with various cross-sectional sizes, aspect ratios, slenderness ratios and load ratios were thoroughly analyzed. The end-restrained rectangular STRC columns fail in fire mainly due to runaway of axial contraction, and the failure mode may shift from dynamic to static as the axial restraint increases. The fire resistance of rectangular STRC columns subjected to bending around the major axis is generally higher than in the case of minor-axis bending. The axial force inside the column decreases nearly linearly while the fire resistance experiences an almost linear increase with increasing the axial restraint ratio. The beneficial effect of rotational restraint, i.e. decreasing the buckling length and enhancing the fire resistance is prominent, especially for columns under relatively low restraining levels. Finally, simplified equations were given for designing the structural fire performance of rectangular STRC columns with considering the end restraining effects.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"24 6","pages":"1406 - 1421"},"PeriodicalIF":1.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 Analytical Study on Fire Resistance Performance of Mid-High Rise Modular Rectangular Steel Tube Columns Using a 3 h Fireproof Cladding Method 采用 3 h 耐火包层法的中高层模块化矩形钢管柱耐火性能实验与分析研究

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-11 DOI: 10.1007/s13296-024-00887-8

Norovbadam Dashdemberel, Seul-Gi Han, Sun-Hee Kim, Kyung-Soo Chung, Sung-Mo Choi

{"title":"Experimental and Analytical Study on Fire Resistance Performance of Mid-High Rise Modular Rectangular Steel Tube Columns Using a 3 h Fireproof Cladding Method","authors":"Norovbadam Dashdemberel, Seul-Gi Han, Sun-Hee Kim, Kyung-Soo Chung, Sung-Mo Choi","doi":"10.1007/s13296-024-00887-8","DOIUrl":"10.1007/s13296-024-00887-8","url":null,"abstract":"<div><p>To ensure the fire resistance performance of modular construction, various methods such as spray-applied fire resistive material (SFRM), intumescent paint, and gypsum board can be used. Rectangular steel tube columns, commonly used in modular construction units, are fireproofed by attaching fireproofing boards. The required thickness of the fireproof board increases with the duration of fire exposure, which in turn increases the self-weight. To address these issues, this study proposes two conditions for improving fire resistance: (1) SFRM application, and (2) mortar filling or finishing on both the inside and outside of small-sized rectangular steel tube columns in modular units. Experimental and analytical approaches were employed to evaluate the behavior of these columns over time under fire exposure and to analyze the required sheathing thickness according to the fire-resistant sheathing method. The results indicated that mortar filling suppressed the temperature rise due to its thermal storage effect. The application of fireproofing spray after mortar filling extended the fire resistance time by approximately 143 to 146% compared to the unfilled specimen. It was also found that SFRM provided a 149% higher fireproofing performance compared to finishing mortar.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"24 5","pages":"1178 - 1188"},"PeriodicalIF":1.1,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Moment Capacity of Bolted-Side Plate for the Eaves Joint of Nested Tapered Box Beam Portal Frame 嵌套锥形箱梁门式框架檐口连接处螺栓连接侧板的承载力

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-10 DOI: 10.1007/s13296-024-00888-7

Bikram Paul, Krishanu Roy, Zhiyuan Fang, Amir Shahmohammadi, James B.P. Lim

{"title":"Moment Capacity of Bolted-Side Plate for the Eaves Joint of Nested Tapered Box Beam Portal Frame","authors":"Bikram Paul, Krishanu Roy, Zhiyuan Fang, Amir Shahmohammadi, James B.P. Lim","doi":"10.1007/s13296-024-00888-7","DOIUrl":"10.1007/s13296-024-00888-7","url":null,"abstract":"<div><p>The joints of cold-formed steel (CFS) portal frames with box sections are primarily formed either through stiffened welded connections or by bolted end plates, which typically involve costly full penetration butt welds. In New Zealand, CFS portal frames with nested tapered box beam (NTBB) sections are popular, and the joints of these portal frames are also formed through a bolted end plate system. In literature, it was found that welds in these joints are prone to cracking in the heat-affected zone (HAZ) under bearing opening moments (tension). Therefore, this paper focuses on proposing an alternative connection system (bolted-side plate) for eaves joints without any weld, aiming to reduce the overall cost of construction and increase construction speed. The performance (strength and stiffness) of these joints is mainly dependent on the geometric details of the bolted-side plate, which is limited in Australia/New Zealand standards (AS/NZ 4600). Herein, a non-linear finite element (FE) model was developed for the NTBB portal frame and validated against the experimental test results from the literature. Firstly, the validated FE model was used to investigate the feasibility of using bolted-side plates for NTBB portal frames and found that the bolted-side plate can increase the ultimate capacity of NTBB portal frame by 9%. A parametric study was then conducted by considering different geometric details of the bolted-side plates under both closing (gravity) and opening (wind uplift) moments. Finally, unified design equations for the moment capacity of bolted-side plates were proposed based on the results of the parametric study, and their accuracy was assessed through reliability analysis.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"24 5","pages":"1189 - 1201"},"PeriodicalIF":1.1,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13296-024-00888-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Innovative Dual-Level Energy Dissipation System with Friction/Yielding Dampers: Numerical and Theoretical Approaches 带摩擦/屈服阻尼器的创新型双级消能系统：数值和理论方法

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-09 DOI: 10.1007/s13296-024-00894-9

Mehrdad Dorj, Mojtaba Gorji Azandariani, Mohammad Gholami, Ali Mohammad Rousta

引用次数: 0

Investigation of Effective Notch Stress at the Root of the Rib-to-Deck Weld in an OSD Box Girder Bridge Considering the Wheel Load Position 考虑轮载位置的 OSD 箱梁桥肋对桥面焊缝根部有效缺口应力研究

IF 1.1 4区工程技术

International Journal of Steel Structures Pub Date : 2024-09-08 DOI: 10.1007/s13296-024-00889-6

Mark Joel Bañares Uaje, Jun Murakoshi

{"title":"Investigation of Effective Notch Stress at the Root of the Rib-to-Deck Weld in an OSD Box Girder Bridge Considering the Wheel Load Position","authors":"Mark Joel Bañares Uaje, Jun Murakoshi","doi":"10.1007/s13296-024-00889-6","DOIUrl":"10.1007/s13296-024-00889-6","url":null,"abstract":"<div><p>Fatigue cracks have been reported in orthotropic steel deck bridges under severe traffic conditions in Japan, particularly root-deck and bead cracks, which initiate from the root of the rib-to-deck weld. The local stress directly influencing crack initiation was investigated using a finite element model based on a section of an actual bridge with a high incidence of cracks. The analysis focused on the weld root at the floor beam intersection and the span center of the bridge section. The model was subjected to loading in the transverse and longitudinal direction of the bridge combined with various wheel load configurations. The effect on the local stress properties was analyzed using the effective notch stress approach. A load position slightly off-center of the U-rib resulted in peak stress at the study locations. Its principal stress direction angle around the notch suggests a root-deck type of crack initiation. Testing several pavement stiffnesses revealed that using an SFRC pavement resulted in a 76%–84% reduction of peak effective notch stress compared to asphalt pavement. Furthermore, varying weld configurations demonstrated that lowering the weld penetration rate could alter the local stress position, influencing the crack initiation direction.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"24 6","pages":"1368 - 1379"},"PeriodicalIF":1.1,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13296-024-00889-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0