International Journal of Steel Structures最新文献

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Influence of Residual Stresses on the Fatigue Behaviour of an Orthotropic Steel Deck Using Fracture Mechanics Approach 用断裂力学方法研究残余应力对正交各向异性钢甲板疲劳性能的影响
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-24 DOI: 10.1007/s13296-025-00964-6
Aditya Manoj Thakre, Arindom Bora, Debabrata Podder
{"title":"Influence of Residual Stresses on the Fatigue Behaviour of an Orthotropic Steel Deck Using Fracture Mechanics Approach","authors":"Aditya Manoj Thakre,&nbsp;Arindom Bora,&nbsp;Debabrata Podder","doi":"10.1007/s13296-025-00964-6","DOIUrl":"10.1007/s13296-025-00964-6","url":null,"abstract":"<div><p>The present study illustrates the fatigue behaviour with the presence of welding residual stress for an orthotropic steel deck bridge subjected to a range of traffic loads. The fatigue estimation methodology adopted integrates the concept of fracture mechanics with rainflow counting. Numerical models in commercially available finite element software along with rainflow counting algorithm as per ASTM standards are explicitly developed. Fatigue failure due to welding residual stresses has been reported extensively in the literature, so its evaluation would facilitate understanding the distribution and determining the stress concentrations essential in designing OSD bridge structures. The existing Mingzhu Bay bridge is considered to understand its behaviour under various traffic loads. The results emphasize the need to consider residual stress effects while evaluating the fatigue life of OSD bridges. Results showed that the initial fatigue life of concern points decreased significantly with welding residual stresses, with the fatigue life of OSD dropping from <span>(4.6times {10}^{6})</span> cycles to <span>(1.0times {10}^{3})</span> cycles for an initial crack length of 0.1 mm.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"773 - 783"},"PeriodicalIF":1.4,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169785","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
Retraction Note: Experimental Study for Local Buckling of Curved Special-Shaped Pylon 注:弯曲异形塔局部屈曲的试验研究
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-20 DOI: 10.1007/s13296-025-00968-2
Huili Wang, Feng Nie, Weihe Zhao, Dechang Zhang
{"title":"Retraction Note: Experimental Study for Local Buckling of Curved Special-Shaped Pylon","authors":"Huili Wang,&nbsp;Feng Nie,&nbsp;Weihe Zhao,&nbsp;Dechang Zhang","doi":"10.1007/s13296-025-00968-2","DOIUrl":"10.1007/s13296-025-00968-2","url":null,"abstract":"","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"784 - 784"},"PeriodicalIF":1.4,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166877","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
Effect of Fiber Orientation and Clearance on Load Sharing in Multi-Bolt Composite Connections: A Micro-Mechanical Perspective 纤维取向和间隙对多螺栓复合连接载荷分担的影响:微观力学视角
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-19 DOI: 10.1007/s13296-025-00956-6
Supriya M Jadhav, Appaso M. Gadade, Harish K Sharma, Rajmeet Singh, Rahul Kumar
{"title":"Effect of Fiber Orientation and Clearance on Load Sharing in Multi-Bolt Composite Connections: A Micro-Mechanical Perspective","authors":"Supriya M Jadhav,&nbsp;Appaso M. Gadade,&nbsp;Harish K Sharma,&nbsp;Rajmeet Singh,&nbsp;Rahul Kumar","doi":"10.1007/s13296-025-00956-6","DOIUrl":"10.1007/s13296-025-00956-6","url":null,"abstract":"<div><p>The impact of varying fiber orientations and clearances on load sharing by each bolt and displacement in multi-bolt laminated composite joints subjected to in-plane tensile loads is investigated in this paper. A semi-analytical spring model used for evaluating load distribution and displacement through a computational micromechanical approach. Within this approach, the distinct properties of the matrix and fibers are individually considered to assess laminate properties, utilizing a homogenization technique. This approach enables better control over design parameters which helps in evaluating accurate load sharing with optimum computational efforts. The disparity between the maximum and minimum loads borne by bolts serves as a metric for evaluating the load-sharing efficiency of the bolted connection. The impact of bolt-hole clearance is explored across various lamination schemes and volume fiber fractions.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"633 - 646"},"PeriodicalIF":1.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167429","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
Hysteretic Model and Numerical Analysis of a Self-centering Disc Slit Damper 自定心盘式狭缝阻尼器滞回模型及数值分析
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-13 DOI: 10.1007/s13296-025-00966-4
Hua Lei, Jiawang Liu, Asad Naeem, Canxing Qiu
{"title":"Hysteretic Model and Numerical Analysis of a Self-centering Disc Slit Damper","authors":"Hua Lei,&nbsp;Jiawang Liu,&nbsp;Asad Naeem,&nbsp;Canxing Qiu","doi":"10.1007/s13296-025-00966-4","DOIUrl":"10.1007/s13296-025-00966-4","url":null,"abstract":"<div><p>The self-centering (SC) hysteretic damper can effectively enhance the seismic resilience of structures, due to its supplemental damping and recentering capability. Recently, a new SC damper, is developed known as the SC Disc Slit Damper (SC-DSD) was experimentally tested using cyclic loading test. In the proposed damper, the steel slit dampers play the role of energy dissipation (ED) source, while the pre-compressed disc spring stacks form the SC system. The tests have shown that the telescopic configuration of the damper ensures a symmetric cyclic behavior. However, additional analytical and finite element (FE) analyses are required to more deeply explore the effects of the damper's parameters and its local behavior. Based on the working mechanism of the damper, the restoring force models of the ED system and SC system are first derived individually, and then they are combined to obtain the hysteretic model of the damper. In addition, the FE model of the damper is established to provide additional information that is challengeable to observe in tests. The accuracy of the analytical method and FE model is confirmed by the testing results. Further, the parametric analysis is conducted based on the validated FE model, using the key parameters of the length of the steel strips, the width of the steel strips, and the preload of the stacked disc springs. Based on this work, the hysteretic behavior of the damper is further understood, and more importantly, it provides more insights for practical applications of the damper.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"673 - 685"},"PeriodicalIF":1.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165470","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
Physics and Data Driven Modeling for Local Damage Evolution of Cold-Formed Steel Rack Uprights: Cases Study 冷弯钢机架立柱局部损伤演化的物理和数据驱动建模:案例研究
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-09 DOI: 10.1007/s13296-025-00961-9
Zhi-Jun Lyu, Qi Chen, Menghao Ji, Wenjing Sun, Hongliang Li
{"title":"Physics and Data Driven Modeling for Local Damage Evolution of Cold-Formed Steel Rack Uprights: Cases Study","authors":"Zhi-Jun Lyu,&nbsp;Qi Chen,&nbsp;Menghao Ji,&nbsp;Wenjing Sun,&nbsp;Hongliang Li","doi":"10.1007/s13296-025-00961-9","DOIUrl":"10.1007/s13296-025-00961-9","url":null,"abstract":"<div><p>The steel rack upright is an essential member of the storage pallet rack system, which is made from mostly cold-formed thin-walled perforated steel profiles. Due to frequent storage and retrieval operations, pallet rack structures are likely subjected to accidental impact from forklifts or other material-handling robots. These impacts can cause local damage to the upright members, probably leading to the progressive collapse of the whole rack structure. In this paper, a physics and data-driven model is proposed for structure engineers to rapidly and quantitatively evaluate the upright local damage. First, finite element models of local bending damaged uprights are developed to accurately simulate the physical experimental results from the compression tests. It is shown that the corner damage of uprights is the most dangerous impact pattern compared to web damage and flange damage. Under certain special conditions, such as smaller upright sections and intermediate stiffeners, the upright with about 1 mm of local bending deformation at the corners can lead to an average decline of the carrying capacity up to 31.02%. Subsequently, a convolutional neural network (CNN) model is trained based on finite element method simulation data to predict the residual carrying capacity of damaged uprights quickly. The results obtained from the cases study indicate that the predicted values of CNNs are in good agreement with the FE numerical values, with mean absolute percentage error being 3.46%, which is a valuable decision-making tool for system engineers in the refined preventive maintenance of the automated storage and retrieval system.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"755 - 772"},"PeriodicalIF":1.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164155","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
Steel-Truss Assembly Accuracy Analysis Based on Error Propagation and Stochastic Simulation 基于误差传播和随机仿真的钢桁架装配精度分析
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-09 DOI: 10.1007/s13296-025-00959-3
Li-Hang Chen, Dong Liang, Hai-Bin Huang, Li-Chao Su, Bo Wang
{"title":"Steel-Truss Assembly Accuracy Analysis Based on Error Propagation and Stochastic Simulation","authors":"Li-Hang Chen,&nbsp;Dong Liang,&nbsp;Hai-Bin Huang,&nbsp;Li-Chao Su,&nbsp;Bo Wang","doi":"10.1007/s13296-025-00959-3","DOIUrl":"10.1007/s13296-025-00959-3","url":null,"abstract":"<div><p>The manufacturing error of steel truss members features significant randomness, which may result in discrepancies between the assembly accuracy of structural members on-site and the design specifications. This paper proposes an assembly accuracy analysis approach based on error propagation and stochastic simulation, constructing a theoretical framework for analyzing and quantifying the assembly accuracy under the influence of all uncertainty factors encountered during the assembly process. In addition, the reliability of assembly accuracy, i.e., the probability that the structural assembly accuracy on-site satisfies the designed specifications, is taken as a reasonable indicator for determining whether assembly on-site is feasible. First, develop error propagation models for a steel truss and clarify errors’ propagation and accumulation mechanisms. Then, identify uncertainty parameters and sample stochastically. Finally, create assembly limit-state functions and calculate assembly accuracy and corresponding reliability through the Monte Carlo simulation. Taking a flat and a spatial steel truss in practical engineering as an example, the results show that the assembly accuracy of the flat truss is 1.361 and 1.698 mm, and that of the spatial truss is 6.422, 6.927, 6.357, 7.346 mm, all above accuracy with 100% reliability. The sensitivity analysis results show that the rod length error plays an important role during flat truss assembly, and so does angular error during spatial truss assembly. The developed strategy is independent of the materials and structures applied. Therefore, it can be used for more complicated structures.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"609 - 621"},"PeriodicalIF":1.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164000","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
Cyclic Behavior of Two-Layer Flat-CSSWs with Square Opening 方形开口双层平面cssw的循环性能
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-09 DOI: 10.1007/s13296-025-00958-4
Ping Lv
{"title":"Cyclic Behavior of Two-Layer Flat-CSSWs with Square Opening","authors":"Ping Lv","doi":"10.1007/s13296-025-00958-4","DOIUrl":"10.1007/s13296-025-00958-4","url":null,"abstract":"<div><p>Flat-CSSWs (FCSSWs) have been introduced recently to enhance standard steal shear walls’ (SSWs) lateral behavior. The present paper studied the productivity of a two-layer SSW (SSW) system composed of a flat and corrugated plate with and without centrally-placed square opening under cyclic loading in the finite element Abaqus software. The results showed that adding central square openings decreased resistance, initial rigidity, and energy absorption. In general, owing to the opening, the maximum lateral resistance and energy intake have decreased by 31.4% and 45.9%, respectively. The maximum lateral resistance and energy absorption of FCSSWs have been achieved compared to flat SSWs. The difference between the maximum resistance and energy absorption of the two is 10.5% and 54.1%, respectively, which indicates the influence of the flat-corrugated system on the amount of energy absorption compared with the traditional flat SSW system. Also, despite severe pinching in the hysteresis curve of flat SSWs with and without an opening, the pinching phenomenon is not displayed in the hysteresis curve of FCSSWs with an opening. The average equivalent viscous damping in flat SSWs and FCSSWs is 31.77% and 39.35%, respectively. Also, raising the corrugated plate’s corrugation angle has increased the structural parameters. However, this increase is not significant. In addition to the fully connected FCSSWs samples to the boundary members, the investigation of the behavior of the beam-connected samples showed that the resistance and energy absorption in this system is between 13% and 14.2% compared to the corresponding samples with and without openings.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"591 - 608"},"PeriodicalIF":1.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163995","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
Optimisation of the Construction Closure Temperature for Large-Span Steel Roof Structures Based on the Minimisation of In-Service Internal Forces 基于在役内力最小的大跨度钢屋盖结构施工闭合温度优化
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-06 DOI: 10.1007/s13296-025-00957-5
Wei Lu, Jiayi Zheng, Kai Huang, Weihua Hu, Jun Teng
{"title":"Optimisation of the Construction Closure Temperature for Large-Span Steel Roof Structures Based on the Minimisation of In-Service Internal Forces","authors":"Wei Lu,&nbsp;Jiayi Zheng,&nbsp;Kai Huang,&nbsp;Weihua Hu,&nbsp;Jun Teng","doi":"10.1007/s13296-025-00957-5","DOIUrl":"10.1007/s13296-025-00957-5","url":null,"abstract":"<div><p>The closure process of a large-span steel roof directly determines the initial temperature effect during the service life of the structure and affects its internal force, particularly for parts with strong constraints. Therefore, it is essential to elucidate the influence mechanism of the stress response of large-span steel roofs for different closure processes and develop methods for closure optimisation in these structures. In this study, we proposed a novel method to determine the construction closure temperature of such structures by minimising in-service internal forces. Firstly, the surface temperature of the steel components was defined as the sum of the air temperature and temperature increase due to solar radiation. Subsequently, we determined the extremely high, extremely low, and annual average temperatures at the structure location. We then obtained the service temperature conditions of the structure by subtracting the construction closure temperature from these three temperature values. The structural response was subsequently simulated under various construction closure temperatures, and the relationship between the structural response and construction closure temperature was established, using the temperature corresponding to the minimum structural response as the construction closure temperature. Lastly, the proposed method was applied to the roof closure of the sub- and overall structures of the Shenzhen Bay Stadium. Subsequently, we evaluated the reaction reduction effect of the closure optimisation process on the constraint position of the bearings in the structure. The results indicate that the proposed method effectively reduces the influence range and degree of the construction process on the structural response during the service stage.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"744 - 754"},"PeriodicalIF":1.4,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162554","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
The Efficiency of Three-Dimensional Finite Elements for the Numerical Analysis of Stiffened Shells 三维有限元在加筋壳数值分析中的有效性
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-05-06 DOI: 10.1007/s13296-025-00960-w
Maria Legouirah, Djamal Hamadi, Abdulrahman M. AL-Nadhari
{"title":"The Efficiency of Three-Dimensional Finite Elements for the Numerical Analysis of Stiffened Shells","authors":"Maria Legouirah,&nbsp;Djamal Hamadi,&nbsp;Abdulrahman M. AL-Nadhari","doi":"10.1007/s13296-025-00960-w","DOIUrl":"10.1007/s13296-025-00960-w","url":null,"abstract":"<div><p>The loads applied to the structure have a considerable influence on the deformation of structures, for thin shells, because of their complex geometry and thin thickness. To avoid large deformations, stiffeners such as longitudinal or circumferential beams can be added to enhance rigidity. Nevertheless, numerical methods such as the finite element method (FEM) are necessary for examining these structures. Two types of finite elements (shell element + beam element) can be used to model the shell structure. However, there may be a compatibility problem at the intersection between the shell and the stiffener. To address this challenge, three-dimensional (3D) finite elements can be used to analyze the entire structure (stiffened shell) numerically. The numerical analysis of stiffened shells using a three-dimensional ABAQUS element (C3D8IH) is presented in this paper. Different types of structures were analyzed and the results obtained were compared with those derived from reference solutions found in the literature. This study confirms the efficiency of three-dimensional (3D) elements used in stiffened shell modeling and leads to very interesting conclusions for engineering application purposes.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"622 - 632"},"PeriodicalIF":1.4,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162552","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
Predicting Damage in Steel Pipe Elbow Under Combined Pressure and Bending Using X-FEM 用X-FEM预测钢管弯头受压弯曲复合损伤
IF 1.4 4区 工程技术
International Journal of Steel Structures Pub Date : 2025-04-15 DOI: 10.1007/s13296-025-00953-9
Chaaben Arroussi, Bassam Gamal Nasser Muthanna, Ismail Chekalil, Zied Driss, Haytham F. Isleem
{"title":"Predicting Damage in Steel Pipe Elbow Under Combined Pressure and Bending Using X-FEM","authors":"Chaaben Arroussi,&nbsp;Bassam Gamal Nasser Muthanna,&nbsp;Ismail Chekalil,&nbsp;Zied Driss,&nbsp;Haytham F. Isleem","doi":"10.1007/s13296-025-00953-9","DOIUrl":"10.1007/s13296-025-00953-9","url":null,"abstract":"<div><p>This study determined the limit loads for API X60 pipe elbows subjected to in-plane bending moments in both opening and closing modes, while accounting for the effects of internal pressure. Load–deflection curves were analyzed to identify plastic collapse and instability loads at various pressure levels. The extended finite element method (XFEM) was used, incorporating a specialized elbow element to account for varying bend factors. The results indicated that theoretical equations are more conservative for closing moments compared to opening moments. Internal pressure significantly enhances load-bearing capacity, with a more pronounced effect as the bend factor increases. The Goodall equation remains conservative when combined with internal pressure and bending moments. Additionally, the study highlights pipe elbow geometry as a key factor influencing structural capacity, offering valuable insights for safer pipeline design.</p></div>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":"25 3","pages":"705 - 714"},"PeriodicalIF":1.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165204","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
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