Journal of Constructional Steel Research最新文献_第4页

Evolution of ultimate pressure of randomly corroded pipes based on stochastic numerical analysis and CNN 基于随机数值分析和CNN的随机腐蚀管道极限压力演化

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-05-01 Epub Date: 2026-02-05 DOI: 10.1016/j.jcsr.2026.110276

Ni Zhang , Pengyuan Li , Zhongwei Zhao , Zhancai Lao

{"title":"Evolution of ultimate pressure of randomly corroded pipes based on stochastic numerical analysis and CNN","authors":"Ni Zhang , Pengyuan Li , Zhongwei Zhao , Zhancai Lao","doi":"10.1016/j.jcsr.2026.110276","DOIUrl":"10.1016/j.jcsr.2026.110276","url":null,"abstract":"<div><div>Research on corroded pressure pipelines is of great importance, given their critical role in industries including oil and gas, chemical processing, water distribution, and power generation. Corrosion is among the most detrimental factors impacting pressure pipeline safety. Via stochastic finite element analysis, this study explores the degradation law of external ultimate pressure for randomly corroded pipelines concerning the mass loss rate <em>χ</em>. It also examines the effect of axial loading on the radial pressure of such pipelines and clarifies how geometric dimensions (characterized by diameter-to-thickness ratio) and material yield strength impact their ultimate radial compressive bearing capacity. Furthermore, a reduction coefficient is proposed to quantify the degradation of corroded pipelines' ultimate compressive bearing capacity. Results show that the study's conclusions apply to pressure pipelines of various strength grades. Meanwhile, a theoretical simplified formula for the reduction coefficient—covering the range of diameter-to-thickness ratios commonly used in engineering practice—is established. Moreover, an optimized convolutional neural network (CNN) is introduced to effectively predict the reduction coefficient for corroded pipelines with varying diameter-to-thickness ratios. Overall, this research lays a foundation for the safety assessment of corroded pressure pipelines.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"240 ","pages":"Article 110276"},"PeriodicalIF":4.0,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Simulation-based 4R fatigue assessment of high-frequency mechanical impact treated welded joints 基于仿真的高频机械冲击处理焊接接头4R疲劳评估

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-05-01 Epub Date: 2026-01-31 DOI: 10.1016/j.jcsr.2026.110263

Tero Pesonen , Jani Riski , Kalle Lipiäinen , Antti Ahola , Martin Leitner , Tuomas Skriko

{"title":"Simulation-based 4R fatigue assessment of high-frequency mechanical impact treated welded joints","authors":"Tero Pesonen , Jani Riski , Kalle Lipiäinen , Antti Ahola , Martin Leitner , Tuomas Skriko","doi":"10.1016/j.jcsr.2026.110263","DOIUrl":"10.1016/j.jcsr.2026.110263","url":null,"abstract":"<div><div>High-frequency mechanical impact (HFMI) treatment improves the fatigue strength of welded joints by compressive residual stresses, improved local geometry, and strain hardening, which can be considered in fatigue predictions using the 4R method. This study investigates the applicability of a simulation-based fatigue assessment model to HFMI-treated longitudinal stiffener joints. The finite element (FE) simulation of fabrication and cyclic loading integrates computational weld mechanics (CWM), material prediction in the heat-affected zone (HAZ), HFMI treatment simulation, and cyclic material response analysis under mechanical loading. The fatigue assessments were carried out using the multiparametric fatigue analysis, the 4R method, which employs FE-simulated material local stress responses. The simulation results were experimentally validated through geometry and residual stress measurements, hardness characterizations, and fatigue tests, showing a reasonably good agreement with the experimental findings. The simulation-based fatigue life values showed good agreement with experimental results at the low stress ratio (<em>R</em> = 0.1), with simulation-based predictions being slightly conservative. At a higher stress ratio (<em>R</em> = 0.5), the simulation-based model, with simplifications, was not able to capture all fatigue characteristic factors of the specimen, predicting non-conservative capacity for the HFMI-treated joint compared to the experimental data. Nevertheless, simulation models are an effective tool for estimating the local fatigue-effective stresses and strains for HFMI-treated joints in validated and applicable ranges of load conditions, and offer a cost-effective alternative to experimental specimen fabrication and fatigue testing.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"240 ","pages":"Article 110263"},"PeriodicalIF":4.0,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A theoretical model of bending–torsion coupling behavior for curved composite box girders with corrugated steel webs 波纹钢腹板弯曲组合箱梁弯扭耦合特性的理论模型

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-08 DOI: 10.1016/j.jcsr.2025.110220

Chang Wei Yao , Chun Sheng Wang , Wen Ting Zhang

{"title":"A theoretical model of bending–torsion coupling behavior for curved composite box girders with corrugated steel webs","authors":"Chang Wei Yao , Chun Sheng Wang , Wen Ting Zhang","doi":"10.1016/j.jcsr.2025.110220","DOIUrl":"10.1016/j.jcsr.2025.110220","url":null,"abstract":"<div><div>This study develops a novel theoretical model based on rotational shell theory for analyzing elastic bending-torsion coupling in curved composite box-girders with corrugated steel webs (CCBG-CSWs). The model incorporates key factors including initial curvature and its transverse variation, shear deformation, and the flexural contribution of the webs, with its accuracy confirmed by experimental and numerical validations. The results demonstrate that the bending-torsion coupling intensifies within specific parameter ranges: a span-to-radius ratio exceeding 0.6, a radius-to-width ratio below 10, or a bending-to-torsion stiffness ratio exceeding 10. Under centerline loading, restrained torsion warping normal stress remains below 5.0 %, with negligible shear-lag effects. Inboard eccentric loading, however, reduces coupling while increasing distortional warping stress. Compared to flat steel webs, corrugated steel webs significantly reduce flexural stiffness, primarily due to the wrinkling effect, with minimal impact on torsional stiffness. Although the increased vertical shear area offers some compensation, it is insufficient to fully restore the flexural stiffness. Furthermore, incorporating the shear deformation of corrugated steel webs increases vertical deflection by 5.3 % without significantly increasing torsional angle or normal stress. Finally, accounting for their flexural contribution further reduces normal stress by 4.5 %. In summary, this study provides a robust theoretical method and critical insights for analyzing and optimizing CCBG-CSWs.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110220"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Numerical investigation of extremely low-cycle fatigue behavior in cylindrical steel specimens 圆柱钢试件极低周疲劳行为的数值研究

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-19 DOI: 10.1016/j.jcsr.2026.110247

Yoshiharu Sato , Suguru Itabashi , Yu Jiao , Satoshi Yamada

{"title":"Numerical investigation of extremely low-cycle fatigue behavior in cylindrical steel specimens","authors":"Yoshiharu Sato , Suguru Itabashi , Yu Jiao , Satoshi Yamada","doi":"10.1016/j.jcsr.2026.110247","DOIUrl":"10.1016/j.jcsr.2026.110247","url":null,"abstract":"<div><div>In extremely low-cycle fatigue (ELCF) tests using cylindrical specimens, localized necking deformation occurs, resulting in a non-uniform stress and strain state in the gauge section. Consequently, fatigue life is affected by gauge length. This effect impacts not only the fracture life but also the fatigue life up to the onset of strength degradation, which can be defined as the damage-initiation fatigue life. In this study, finite element analysis (FEA) was employed to examine the stress and strain state within a cylindrical specimen under ELCF conditions and investigate the influence of gauge length on the damage-initiation fatigue life. FEA was conducted based on two existing ELCF test methods using 490 N/mm<sup>2</sup> grade steel with different gauge lengths and strain amplitudes ranging from 3% to 12%. Two material constitutive models capable of accurately reproducing the stress–strain behavior under constant-strain-amplitude cyclic loading were employed. At the specimen center—where the fracture initiates under ELCF conditions—the mean strain shifted toward the tensile side as the number of cycles increased and the strain amplitude exceeded the controlled strain amplitude measured between the gauge points. Furthermore, the shift in mean strain and the increase in strain amplitude were more pronounced in specimens with longer gauge lengths. The influence of gauge length on fatigue life can generally be assessed by evaluating the damage-initiation fatigue life using the rain-flow counting method and Miner's linear cumulative damage rule applied to the strain history at the specimen center.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110247"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 resistance of beam-to-column fully welded connection joint in steel frame 钢框架梁柱全焊接连接节点的耐火性能

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-06 DOI: 10.1016/j.jcsr.2025.110230

Shenggang Fan , Lizhi Hu , Tiangui Xu , Yiwen Wu , Shengjie Duan

{"title":"Fire resistance of beam-to-column fully welded connection joint in steel frame","authors":"Shenggang Fan , Lizhi Hu , Tiangui Xu , Yiwen Wu , Shengjie Duan","doi":"10.1016/j.jcsr.2025.110230","DOIUrl":"10.1016/j.jcsr.2025.110230","url":null,"abstract":"<div><div>Full-scale fire tests were conducted on fully welded connection joints in steel frames (FWC-SF) to investigate the effects of load ratio and fireproof coating on the fire resistance, critical temperature, and failure modes. Three specimens were tested, the temperature distributions and deformation responses under fire exposure were obtained. The results indicated that the heating rates of FWC-SF joint components varied, while fireproof coating could mitigate these differentials. Local buckling of the highly heated steel beam bottom flange and web was identified as the fundamental cause of joint failure, with the beam load ratio being the dominant factor affecting fire resistance. Finite element (FE) models were developed and reproduced the temperature field and fire performance of FWC-SF joints as recorded. A series of parametric studies was performed, revealing a threshold effect of column load ratio on fire resistance, and acquiring reduction factors for the initial rotational stiffness and ultimate bending moment of the FWC-SF joint at elevated temperatures. At 600 °C, the ultimate moment decreases by about 50 %, while the initial rotational stiffness is reduced to 15 %, and the FWC-SF joints nearly lose rotational stiffness above 700 °C.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110230"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Enhanced Radial Stress Method (RSM) for cellular beams in EN 1993-1-13 to account for elasto-plastic behaviour EN 1993-1-13中用于计算弹塑性性能的蜂窝梁的增强径向应力法（RSM）

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-05 DOI: 10.1016/j.jcsr.2025.110221

Georgios Psyrras , Konstantinos Daniel Tsavdaridis , R. Mark Lawson

{"title":"Enhanced Radial Stress Method (RSM) for cellular beams in EN 1993-1-13 to account for elasto-plastic behaviour","authors":"Georgios Psyrras , Konstantinos Daniel Tsavdaridis , R. Mark Lawson","doi":"10.1016/j.jcsr.2025.110221","DOIUrl":"10.1016/j.jcsr.2025.110221","url":null,"abstract":"<div><div>In cellular beams with circular openings, <em>Vierendeel</em> bending failure is caused by the local bending around the web openings in regions of high shear. In BS EN 1993-1-13, a Radial Stress Method (RSM) is presented, which is based either on the elastic resistance of the inclined T-sections around the openings or on their plastic bending resistance dependent on the section classification of the inclined T-section, which results in a step between elastic and plastic properties. The RSM method also fails to account for stress redistribution between the lower moment side and the higher moment side of openings. This study investigates the RSM for circular openings in a typical UB 457x152x52 beam, that is modelled and analysed using Abaqus. The RSM is extended to an elasto-plastic analysis of the inclined T-sections that gives a way of evaluating the development of the <em>Vierendeel</em> bending mechanism and may be used for slender webs. The elasto-plastic analysis around the openings subject to axial force, shear and bending is based on a multiple of the yield strain at the edge of the opening. This is compared to the non-linear FEA results, which show good agreement for the stress distribution around the openings on the lower moment and higher moment sides of the openings for all combinations of applied shear and moment. The results of the method are also compared to cellular beam tests results failing in Vierendeel bending.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110221"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145895818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Diagonal-extremum model for shear strength in double steel plate-concrete composite shear wall 双钢板-混凝土组合剪力墙抗剪强度的对角极值模型

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-10 DOI: 10.1016/j.jcsr.2025.110226

Wentao Liang , Yuanlong Yang , Jian Zhang , Xiangsheng Chen , Xiong Peng , Yohchia Frank Chen

引用次数: 0

Study on the global stability of members strengthened with outer sleeves 外套管加固构件整体稳定性研究

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-21 DOI: 10.1016/j.jcsr.2026.110250

Zeyuan Jin , Yunbo Yang , Jinghai Yu , Bin Wang , Shuangqiu Cao , Zhongwei Zhao

{"title":"Study on the global stability of members strengthened with outer sleeves","authors":"Zeyuan Jin , Yunbo Yang , Jinghai Yu , Bin Wang , Shuangqiu Cao , Zhongwei Zhao","doi":"10.1016/j.jcsr.2026.110250","DOIUrl":"10.1016/j.jcsr.2026.110250","url":null,"abstract":"<div><div>This paper presents a prefabricated outer-sleeve strengthening method to address buckling of compression members in space structures. Eleven axial compression specimens and accompanying numerical analyses investigate the influence of key parameters on global stability. Results show that sleeve reinforcement significantly increases the ultimate bearing capacity, and failure modes are dominated by buckling at the middle span and sleeve slippage. It is revealed that rational hoop spacing is critical for preventing capacity degradation, and an optimal configuration is identified to ensure effective composite action. Finite-element analyses indicate that increasing geometric dimensions such as sleeve thickness and outer diameter effectively enhances the capacity through increased moment of inertia. Furthermore, the sensitivity of the strengthened members to initial imperfections is quantified. Theoretical derivations demonstrate that the lateral restraint provided by the sleeve significantly reduces the equivalent slenderness ratio, confirming that lateral restraint governs stability improvement. Based on the small-deflection theory and static equilibrium conditions, the prediction formula for the ultimate capacity of sleeved reinforced members is derived. Verification results demonstrate good agreement between the theoretical predicted values and experimental values. The findings offer a theoretical basis for engineering practice.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110250"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Axial compressive capacity of volcanic scoria concrete-filled circular steel tube stub columns 火山渣圆钢管混凝土短柱轴压承载力研究

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-07 DOI: 10.1016/j.jcsr.2026.110233

Bin Cai , Yuyan Wang , Lixiang Zhang , Lin Wang , Feng Fu

{"title":"Axial compressive capacity of volcanic scoria concrete-filled circular steel tube stub columns","authors":"Bin Cai , Yuyan Wang , Lixiang Zhang , Lin Wang , Feng Fu","doi":"10.1016/j.jcsr.2026.110233","DOIUrl":"10.1016/j.jcsr.2026.110233","url":null,"abstract":"<div><div>In this paper, lightweight concrete with different volcanic scoria coarse aggregate (VSCA) replacement ratios (0 %, 25 %, 50 %, 75 %, 100 %) into steel tube of varying wall thicknesses (2.5 mm, 3 mm, 4 mm), 15 volcanic scoria concrete-filled steel tube (VSCFST) stub column specimens were tested. A systematic study was conducted on the effects of VSCA replacement ratios and steel ratios (6.35 %, 7.69 %, 10.45 %) on their axial compressive capacity. The test results demonstrated that when the VSCA replacement ratio ≤ 50 % and the steel tube wall thickness ≥ 4 mm, the specimens primarily exhibit mid-section buckling failure; when the VSCA replacement ratio ≥ 75 % or the wall thickness ≤ 3 mm, the specimens are prone to end-section shear failure. As the VSCA replacement ratio increases, the ultimate load capacity, elastic stiffness, and ductility of the specimens all show a decreasing trend; however, increasing the wall thickness of steel tube can effectively enhance these mechanical properties. This phenomenon can be attributed to the incorporation of VSCA weakening the synergistic effect between concrete and steel tube. Additionally, the reliability of the finite element model developed in Abaqus software was validated using the test results, followed by a comprehensive parameter analysis. Finally, the applicability of current design codes was verified by comparing experimental data, and a modified ultimate load capacity calculation formula considering the VSCA replacement ratios and steel tube confinement effect was developed. This formula predicts the ultimate load capacity of VSCFST stub columns with a deviation within 5 % from the experimental values.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110233"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 study on frame-supported cold-formed thin-walled steel structure 框架支撑冷弯薄壁钢结构试验研究

IF 4 2区工程技术

Journal of Constructional Steel Research Pub Date : 2026-04-01 Epub Date: 2026-01-15 DOI: 10.1016/j.jcsr.2026.110235

Yuxuan Zou , Rui Wei , Yu Shi , Xinmei Yao

{"title":"Experimental study on frame-supported cold-formed thin-walled steel structure","authors":"Yuxuan Zou , Rui Wei , Yu Shi , Xinmei Yao","doi":"10.1016/j.jcsr.2026.110235","DOIUrl":"10.1016/j.jcsr.2026.110235","url":null,"abstract":"<div><div>A series of tests and numerical analyses were conducted in this study to investigate the seismic performance of frame-supported cold-formed thin-walled steel structures (FCTSS). The FCTSS consists of two parts. The lower part was reinforced concrete or steel frame, and the upper part was comprised of cold-formed thin-walled steel walls. The variables include the lower frame type, interstory stiffness ratio, vertical load, and screw spacing. The experimental and numerical results reveal that all lower frames remained elastic without visible damage, while the upper walls experienced severe damage, involving corner crushing, rigid rotation, and out-of-plane buckling of Oriented Strand Board (OSB) panels. Compared with walls supported by steel frames, walls supported by reinforced concrete frames demonstrated slightly higher yield and peak loads, whereas the ductility decreased. The increase in the stiffness of the lower frame exerted a negligible impact on the seismic response of the upper walls. Notably, reducing the perimeter screw spacing significantly improved the cyclic behavior of upper walls.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110235"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145979393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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