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Trial design of arch bridge of composite box section with steel web-concrete flange

Jiangang WEI, Qingwei HUANG, Baochun CHEN,

《结构与土木工程前沿（英文）》 2010年 第4卷 第3期   页码 370-375 doi: 10.1007/s11709-010-0073-7

摘要： The concrete arch bridge is a natural and appropriate structural solution, aesthetically pleasing and easily integrated into the environment, especially in mountainous and island areas. However, construction difficulty and cost will increase with heavy self-weight when the span enlarges. A potential solution is to use a composite box arch ring with steel web-concrete flange. Taking Wanzhou Yangtze River Bridge (the longest concrete arch bridge in the world with a main span of 420 m) as a prototype, trial designs of a composite box arch with steel webs (including corrugated steel webs and plain steel webs) and concrete flanges were carried out. Comparison of quantities and structural behaviors of the prototype concrete arch with the two trial designed composite arch was presented. It is shown that the self-weight of the composite arch can reduce about 28% and the structures can meet the design requirements, therefore it is possible to use the two composite arches in long span arch bridges.

关键词： steel webs     concrete     box arch     trial design     structural behaviors     finite element method    

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工业生态系统与食物网——以一种基于生态学的质量流分析方法建立中国钢铁制造业模型 Article

Stephen M. Malone, Marc J. Weissburg, Bert Bras

《工程（英文）》 2018年 第4卷 第2期   页码 209-217 doi: 10.1016/j.eng.2018.03.008

摘要：

物质与能量在自然系统和工业系统之间的转换，为推导这些系统之间的相互作用提供了一种标准。考察这些流动是谈论工业如何影响环境的基本内容。我们认为体现可持续性的生物系统提供的方法和原理能为组织工业活动带来更多有用的方法。把这些生物学方法运用到钢铁制造中，可有效利用材料、减少废料并可利用目前的技术减少能源需求。在本文中，我们采用基于系统的质量流分析，利用生态学原理来考察中国钢铁行业中的材料随着时间变化产生的结构与流动方面的变化。运用现有数据，我们的分析结果表明中国钢铁制造业已在单元过程层面提高了能源效率及可持续利用程度，但合理地组织钢铁制造生态系统仍有进步空间。我们的结果表明通过协同行业的智能化布局利用钢铁制造中产生的废料，中国未来的钢铁行业将在减少废料的同时更好地体现生态系统的成熟度与健康状况。

关键词： 生态学网络分析     质量流分析     钢铁制造    

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Prevention of laryngeal webs through endoscopic keel placement for bilateral vocal cord lesions

null

《医学前沿（英文）》 2018年 第12卷 第3期   页码 301-306 doi: 10.1007/s11684-017-0549-0

摘要：

Transoral microresection for treatment of vocal cord lesions involving the anterior commissure may result in anterior glottic webs. In this study, we retrospectively reviewed 54 patients who underwent microsurgery for bilateral lesions involving the anterior commissure and categorized them into two groups. The keel placement and control groups received endoscopic keel placement and mitomycin C, respectively. During the follow-up of at least 1 year, the laryngeal web formation rate significantly decreased in the keel placement group compared with that in the control group (18.6% versus 54.5%, <0.05). Furthermore, the voice handicap index-10 scores for patients without web formation decreased in both the keel placement and control groups ( <0.0001 and <0.001, respectively). A pseudomembrane covering the vocal cords was detected in 16.3% (7 of 43) cases after keel removal. A total of 100% (7 of 7) of these cases and 2.8% (1 of 36) of the other cases formed laryngeal webs ( <0.0001). Endoscopic keel placement could be an effective method for preventing anterior glottic webs after surgery for bilateral vocal cord diseases involving the anterior commissure. The pseudomembrane observed at the time of keel removal may imply a high risk of web formation.

关键词： glottic stenosis     glottic web     laryngeal keel     silastic sheets     anterior commissure    

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中国钢桥

潘际炎

《中国工程科学》 2007年 第9卷 第7期   页码 18-26

摘要：

介绍了我国钢桥的发展及国内外的钢桥比较；论述了建造钢桥的钢材及其要求的化学成分和物理力学性能。

关键词： 中国钢桥     钢材     钢桥设计     钢桥结构    

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On braced trapezoidal corrugated steel shear panels: An experimental and numerical study

《结构与土木工程前沿（英文）》 2023年 第17卷 第3期   页码 396-410 doi: 10.1007/s11709-023-0934-5

摘要： In this study, a new system consisting of a combination of braces and steel infill panels called the braced corrugated steel shear panel (BCSSP) is presented. To obtain the hysteretic behavior of the proposed system, the quasi-static cyclic performances of two experimental specimens were first evaluated. The finite element modeling method was then verified based on the obtained experimental results. Additional numerical evaluations were carried out to investigate the effects of different parameters on the system. Subsequently, a relationship was established to estimate the buckling shear strength of the system without considering residual stresses. The results obtained from the parametric study indicate that the corrugated steel shear panel (CSSP) with the specifications of a = 30 mm, t = 2 mm, and θ = 90° had the highest energy dissipation capacity and ultimate strength while the CSSP with the specifications of a = 30 mm, t = 2 mm, and θ = 30° had the highest initial stiffness. It can thus be concluded that the latter CSSP has the best structural performance and that increasing the number of corrugations, corrugation angle, and plate thickness and decreasing the sub-panel width generally enhance the performance of CSSPs in terms of the stability of their hysteretic behaviors.

关键词： trapezoidal corrugated plate     steel shear panel     braced steel shear panel     experimental study     buckling resistance.    

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宝钢纯净钢生产技术的进步

崔健,郑贻裕,朱立新

《中国工程科学》 2005年 第7卷 第6期   页码 21-26

摘要：

论述了钢中碳、氮、氧、磷、硫以及夹杂物控制方面的技术进步，讨论了IF钢、管线钢所达到的纯净度纵使水平。

关键词： 宝钢     纯净钢     IF钢     管线钢     炼钢    

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Causations of failure in megaprojects: A case study of the Ajaokuta Steel Plant project

Oluwole Alfred OLATUNJI

《工程管理前沿（英文）》 2018年 第5卷 第3期   页码 334-346 doi: 10.15302/J-FEM-2018011

摘要：

This paper uses project organizational theories to draw lessons from a historic megaproject, the Ajaokuta Steel Plant (ASP). Archival reports on the ASP were explored to identify the unique attributes of the project; the political wrangling that underplayed its evolution, its economic significance and organizational impacts. Findings suggest the goals of the ASP project were, and still are, unambiguous. Failure occurred as socio-political forces aggravated the project’s complex milestones. Stakeholders were impatient with pre-project investigations. During planning, owners ignored opinions that were contrary to their expectations. While delays lingered, pressures from the global economy weakened the project’s motivation to succeed. These combined to turn the project’s outcomes into a chaotic situation that triggered dire implications. Despite about 1400% overrun in cost, the success achieved on the plant was 28% at commissioning. Contractors remained on site until eight years after commissioning. Six key elements of the 482 items in the ASP project contract were not delivered nearly 40 years on. A simplistic look at these suggests poor planning is the main problem. However, planning issues is not entirely strange in greenfield projects. The paper draws strength from project organization theories to explain what was poor about the planning. Socrates’ generic management theory was used to explain the role of leadership in the failure of the ASP project. McGregor’s Theory X and Theory Y explain the significance of stakeholders’ integration in megaprojects. Systems and chaos theories were used to explain the sensitivity of the ASP project to uncertainties. Narratives on these combine well to inspire stakeholders of megaprojects on where and how to seek courage in making effective plans that can help achieve success in complex projects. While normative literature only recognizes project success in a definitive perspective, this study provides insights from failure as an instrument to trigger sublime reflections.

关键词： industrial projects     megaprojects     Nigeria     project organizational theories     steel plant    

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Parametric study of hexagonal castellated beams in post-tensioned self-centering steel connections

Hassan ABEDI SARVESTANI

《结构与土木工程前沿（英文）》 2019年 第13卷 第5期   页码 1020-1035 doi: 10.1007/s11709-019-0534-6

摘要： The effects of important parameters (beam reinforcing plates, initial post-tensioning, and material properties of steel angles) on the behavior of hexagonal castellated beams in post-tensioned self-centering (PTSC) connections undergone cyclic loading up to 4% lateral drift have been investigated by finite element (FE) analysis using ABAQUS. The PTSC connection is comprised of bolted top and bottom angles as energy dissipaters and steel strands to provide self-centering capacity. The FE analysis has also been validated against the experimental test. The new formulations derived from analytical method has been proposed to predict bending moment of PTSC connections. The web-post buckling in hexagonal castellated beams has been identified as the dominant failure mode when excessive initial post-tensioning force is applied to reach greater bending moment resistance, so it is required to limit the highest initial post-tensioning force to prevent this failure. Furthermore, properties of steel material has been simulated using bilinear elastoplastic modeling with 1.5% strain-hardening which has perfectly matched with the real material of steel angles. It is recommended to avoid using steel angles with high yielding strength since they lead to the yielding of bolt shank. The necessity of reinforcing plates to prevent beam flange from local buckling has been reaffirmed.

关键词： finite element analysis     hexagonal castellated beam     parametric study     post-tensioned self-centering steel connection     steel moment-resisting frame    

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论单位生产总值钢产量及钢产量、钢铁行业的能耗、物耗和排放

陆钟武,岳强,高成康

《中国工程科学》 2013年 第15卷 第4期   页码 23-29

摘要：

单位生产总值钢产量指标对于调控钢产量，开展钢铁行业的节能、降耗和减排工作具有重要意义。首先给出了单位生产总值钢产量定义式，引入了“在役钢量”概念及其计算式；然后对单位GDP钢产量的定义式进行了两次变换，导出具有分析功能的新定义式；并以新定义式和钢产量计算式、钢铁行业能耗、物耗和排放计算式为依据，对钢产量及钢铁行业的能耗、物耗和排放进行了分析；最后，进行了与钢铁行业相关各参数的分类，并提出全面推进钢铁行业节能、降耗、减排工作的总体看法。

关键词： 单位生产总值钢产量     钢产量     在役钢     单位在役钢GDP     能耗    

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Concepts and implementation of strain-based criteria in design codes for steel structures

Reidar BJORHOVDE

《结构与土木工程前沿（英文）》 2012年 第6卷 第3期   页码 210-216 doi: 10.1007/s11709-012-0165-7

摘要： A uniaxial tension test is commonly used to determine the mechanical properties of steel, but it has no meaning for the response of the material in a structure. The test was developed as a consensus solution by producers, fabricators, designers and code writers, to have a standard by which similar materials could be compared to a common base. It does not represent the actual behavior of the steel in a structure, and was never intended to do so. To study the true behavior of the structure and how the material responds it would be better to determine the strains and deformations that will take place during actual service condition. Such characteristics reflect the real behavior, whether in the elastic or inelastic range. If stresses or forces are needed, these are easily determined by the value of the strain and the relevant material modulus, along with the type of cross section, whether elastic or inelastic. The paper addresses the properties of a range of structural steels, how these are incorporated into design standards and how the standards define deformation characteristics and demands for bolted and welded connections.

关键词： steel     stress-strain characteristics     tension test     strain design     actual behavior     improved design codes    

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Torsional behavior of triangular web profile (TRIWP) steel section by experimental study

Fatimah DE’NAN,Hazwani HASAN,Mohd Hanim OSMAN,Sariffudin SAAD

《结构与土木工程前沿（英文）》 2016年 第10卷 第4期   页码 409-419 doi: 10.1007/s11709-016-0358-6

摘要： A triangular web profile (TriWP) is a modified section where the flanges are connected to a web plate of triangular profile. This study examined the torsional behavior of TriWP steel sections and compared to that of the flat web (FW) steel sections. Three types of specimen sizes were used: 180 mm × 75 mm × 5 mm × 2 mm, 200 mm × 100 mm × 8 mm × 6 mm, and 200 mm × 100 mm × 6 mm × 5 mm. All the specimens were loaded vertically until the maximum load was achieved and then the load was released. For both types of specimens, it was observed that the torsional rotation for bigger size [200 mm × 100 mm × 8 mm × 6 mm] were smaller than that of smaller size [180 mm × 75 mm × 5 mm × 2 mm] of the specimens. At the maximum torsional loading, the experimental result was compared to the theoretical calculation. The comparison showed that the percentage difference ranged from 1.10% to 16.80%. From the graph of torsional load versus rotational angle, the torsional rotation for all TriWP steel sections were smaller than that of the FW steel section under the same torsional loading i.e., 0.2 kNm and 1 kNm. The range between FW and TriWP were 3.74 to 71.83 at 0.2 kNm while 14.5 to 75.1 at 1.0 kNm. The findings were shown that the TriWP steel sections had better resistance against torsion in comparison to FW steel section.

关键词： corrugated web     i-beam     non uniform steel section     torsion resistance     torsion angle     triangular web profile steel section    

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Thermal response of steel framing members in open car park fires

Xia YAN; Marion CHARLIER; Thomas GERNAY

《结构与土木工程前沿（英文）》 2022年 第16卷 第9期   页码 1071-1088 doi: 10.1007/s11709-022-0879-0

摘要： For open car park structures, adopting a performance-based structural fire design is often justified and allowed because the fire does not reach flashover. However, this design approach requires an accurate assessment of temperatures in structural members exposed to car fires. This paper describes a numerical study on the thermal exposure on steel framing members in open car park fires. Steel temperatures are computed by the coupling of computational fluid dynamics and finite element modeling, and by analytical models from the Eurocodes. In addition, the influence of galvanization on the steel temperature evolution is assessed. Results show that temperatures in unprotected beams and columns are influenced by the section geometry, car fire scenario, modeling approach, and use of galvanization. Galvanization slightly delays and reduces peak temperature. Regarding the different models, CFD-FEM (CFD: computational fluid dynamics, FEM: finite-element method) coupled models predict lower temperatures than the Hasemi model, because the latter conservatively assumes that the fire flame continuously touches the ceiling. Further, the Hasemi model cannot account for the effect of reduced emissivity from galvanization on the absorbed heat flux. Detailed temperature distributions obtained in the steel members can be used to complete efficient structural fire designs based on the member sections, structure layout, and use of galvanization.

关键词： open car park     localized fire     steel frame     numerical modeling     computational fluid dynamics    

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关于钢铁企业的结构与钢铁工业的发展模式

殷瑞钰

《中国工程科学》 2001年 第3卷 第6期   页码 24-32

摘要：

基于对钢铁工业发展历史的回顾和对中国钢铁企业结构调整的现状分析, 阐述了钢铁制造流程的解析与集成以及技术进步的方向,探讨了不同类型钢材的生产工艺,分析和展望了未来钢厂结构的发展模式以及投资决策问题。指出钢铁工业的时代命题是:市场竞争力和可持续发展；21世纪钢铁生产流程的功能将朝着冶金功能——低能耗、低物耗、高效率地生产新一代钢铁产品，并降低单位产品的投资额； 能源转换功能——形成工业生态链甚至转换出新能源；社会废弃物处理功能——实现环境友好。钢厂将逐渐向都市周边型钢厂或生态工业钢厂的模式发展。

关键词： 钢铁工业     钢铁厂     结构调整     钢铁制造流程     解析与集成     发展模式    

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Layout optimization of steel reinforcement in concrete structure using a truss-continuum model

《结构与土木工程前沿（英文）》 2023年 第17卷 第5期   页码 669-685 doi: 10.1007/s11709-023-0963-0

摘要： Owing to advancement in advanced manufacturing technology, the reinforcement design of concrete structures has become an important topic in structural engineering. Based on bi-directional evolutionary structural optimization (BESO), a new approach is developed in this study to optimize the reinforcement layout in steel-reinforced concrete (SRC) structures. This approach combines a minimum compliance objective function with a hybrid truss-continuum model. Furthermore, a modified bi-directional evolutionary structural optimization (M-BESO) method is proposed to control the level of tensile stress in concrete. To fully utilize the tensile strength of steel and the compressive strength of concrete, the optimization sensitivity of steel in a concrete–steel composite is integrated with the average normal stress of a neighboring concrete. To demonstrate the effectiveness of the proposed procedures, reinforcement layout optimizations of a simply supported beam, a corbel, and a wall with a window are conducted. Clear steel trajectories of SRC structures can be obtained using both methods. The area of ​​critical tensile stress in concrete yielded by the M-BESO is more than 40% lower than that yielded by the uniform design and BESO. Hence, the M-BESO facilitates a fully digital workflow that can be extremely effective for improving the design of steel reinforcements in concrete structures.

关键词： bi-directional evolutionary structural optimization     steel-reinforced concrete     concrete stress     reinforcement method     hybrid model    

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Orientation effect of electropolishing characteristics of 316L stainless steel fabricated by laser powder

《机械工程前沿（英文）》 2021年 第16卷 第3期   页码 580-592 doi: 10.1007/s11465-021-0633-7

摘要： 3D metal printing process has attracted increasing attention in recent years due to advantages, such as flexibility and rapid prototyping. This study aims to investigate the orientation effect of electropolishing characteristics on different surfaces of 316L stainless steel fabricated by laser powder bed fusion (L-PBF), considering that the rough surface of 3D printed parts is a key factor limiting its applications in the industry. The electropolishing characteristics on the different surfaces corresponding to the building orientation in selective laser melting are studied. Experimental results show that electrolyte temperature has critical importance on the electropolishing, especially for the vertical direction to the layering plane. The finish of electropolished surfaces is affected by the defects generated during L-PBF process. Thus, the electropolished vertical surface has higher surface roughness Sa than the horizontal surface. The X-ray photoelectron spectroscopy spectra show that the electropolished horizontal surface has higher Cr/Fe element ratio than the vertical surface. The electropolished horizontal surface presents higher corrosion resistance than the vertical surface by measuring the anodic polarization curves and fitting the equivalent circuit of experimental electrochemical impedance spectroscopy.

关键词： electropolishing     laser powder bed fusion     316L stainless steel     corrosion resistance     microstructure    

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标题 作者 时间 类型 操作

Trial design of arch bridge of composite box section with steel web-concrete flange

Jiangang WEI, Qingwei HUANG, Baochun CHEN,

期刊论文

工业生态系统与食物网——以一种基于生态学的质量流分析方法建立中国钢铁制造业模型

Stephen M. Malone, Marc J. Weissburg, Bert Bras

期刊论文

Prevention of laryngeal webs through endoscopic keel placement for bilateral vocal cord lesions

null

期刊论文

中国钢桥

潘际炎

期刊论文

On braced trapezoidal corrugated steel shear panels: An experimental and numerical study

期刊论文

宝钢纯净钢生产技术的进步

崔健,郑贻裕,朱立新

期刊论文

Causations of failure in megaprojects: A case study of the Ajaokuta Steel Plant project

Oluwole Alfred OLATUNJI

期刊论文

Parametric study of hexagonal castellated beams in post-tensioned self-centering steel connections

Hassan ABEDI SARVESTANI

期刊论文

论单位生产总值钢产量及钢产量、钢铁行业的能耗、物耗和排放

陆钟武,岳强,高成康

期刊论文

Concepts and implementation of strain-based criteria in design codes for steel structures

Reidar BJORHOVDE

期刊论文

Torsional behavior of triangular web profile (TRIWP) steel section by experimental study

Fatimah DE’NAN,Hazwani HASAN,Mohd Hanim OSMAN,Sariffudin SAAD

期刊论文

Thermal response of steel framing members in open car park fires

Xia YAN; Marion CHARLIER; Thomas GERNAY

期刊论文

关于钢铁企业的结构与钢铁工业的发展模式

殷瑞钰

期刊论文

Layout optimization of steel reinforcement in concrete structure using a truss-continuum model

期刊论文

Orientation effect of electropolishing characteristics of 316L stainless steel fabricated by laser powder

期刊论文