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Initial stiffness and moment resistance of reinforced joint with end-plate connection

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Frontiers of Structural and Civil Engineering 2009年第4期3卷 345-351页

作者： Sufang WANG yiyi chen Shanghai University of Electric Power Shanghai 201300China College of Civil Engineering Tongji UniversityShanghai 200092China

In beam-to-column joint with bolted end-plate connection,the structural details of column flange reinforced by backing plate and column web panel reinforced by supplementary plate are *** joint is divided into some basic components,and the initial stiffness of each component is ***,the initial stiffness of reinforced components is drawn by theoretical model and finite element *** initial stiffness of reinforced joint can be obtained by assembling the initial stiffness of each *** design moment resistance of column flange reinforced by backing plate is deduced based on yield line method,and the design moment resistances of other components are deduced based on present *** design moment resistance of the reinforced joint is then determined by the minimum of the design moment resistances of all *** comparison with the results of finite element calculation,it is verified that the method to calculate the initial stiffness of reinforced joint is accurate enough to be used to estimate the rigid behavior of the joint and to make parametric study.

关键词： steel structure end-plate connection backing plate supplementary web plate initial stiffness moment resistance

Cyanation and cyanomethylation of trimethylammonium salts via electrochemical cleavage of C–N bonds

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Organic Chemistry Frontiers 2022年第5期9卷 1288-1294页

作者： Xianqiang Kong Yuchang Wang yiyi chen Xiaohui chen Long Lin Zhong-Yan Cao School of Chemical Engineering and Materials Changzhou Institute of TechnologyChangzhou 213032China College of Chemistry Chemical Engineering and BiotechnologyDonghua University2999 North Renmin LuShanghai 201620China College of Chemistry and Chemical Engineering Henan UniversityKaifeng 475004China

We have developed a practical and mild electrochemical protocol for cyanation and cyanomethylation of trimethylammonium salts through a pathway involving C–N bond cleavage without the need for an exter-nal stoichiometric reducing agent or a sacrificial *** reaction employs tosyl cyanide(TsCN)or azido allyl alcohol as the cyanation or cyanomethylation reagent,*** shows high functional group compatibility and can be applied for the cyanation of natural product *** mechanistic studies indicate the involvement of a radical addition pathway.

关键词： salts ammonium cleavage

Dynamic material performance of cold-formed steel hollow sections： a state-of-the-art review

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Frontiers of Structural and Civil Engineering 2017年第2期11卷 209-227页

作者： Cameron B. RITCHIE Jeffrey A. PACKER Xiao-Ling ZHAO Amin HEIDARPOUR yiyi chen Department of Civil Engineering University of Toronto Toronto Ontario MSS 1A4 Canada Department of Civil Engineering Monash University Victoria 3800 Australia College of Civil Engineering Tongji University Shanghai 200092 China

This paper presents a literature review focused on the material performance of cold-formed, carbon steel, hollow structural sections under impulsive （highly dynamic） loading. Impulsive loading, represented by impact and blast, is characterized by a very rapid, time-dependent loading regime in the affected members and materials. Thus, the effect of high-strain-rate loading is initially reviewed. Next the material toughness, an important energy-absorption property and one measure of a material＇s ability to arrest fracture, is considered by means of studying the Charpy V-notch behavior. The response of hollow sections under axial and lateral impact loading is then reviewed. Studies of blast on hollow sections, most of which fall under the categories of contact/near-field loading or far-field loading are presented. Under large-scale field blast experiments, cold-formed hollow sections have shown excellent behavior. Software for modeling blast loading and structural response, the latter including single degree of freedom analysis and explicit finite element analysis, is described and discussed.

关键词： cold-formed steel hollow structural sections composites impulsive loading impact blast experimentation analysis material properties

A Study of the Truncated Square Pyramid Geometry for Enhancement of Super-hydrophobicity

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Journal of Bionic Engineering 2020年第4期17卷 843-850页

作者： Wei Gong Yangang Wang yiyi chen Xiang Li Kongjing Li Zhongxu Wang Yuying Yan R&D Centre:Semiconductors Dynex Semiconductor Ltd.Doddington RoadLincolnLN63LFUK Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottinghamNG72RDUK

Super-hydrophobic surfaces are quite common in nature,inspiring people to continually explore its water-repellence property and applications to our *** has been generally agreed that the property of super-hydrophobicity is mainly contributed by the microscale or nanoscale(or even smaller)architecture on the ***,there is an energy barrier between the Cassie-Baxter wetting state and the Wenzel wetting *** optimized square post micro structure with truncated square pyramid geometry is introduced in this work to increase the energy barrier,enhancing the robustness of *** analysis is conducted based on the wetting transition energy *** simulation based on a phase-field lattice Boltzmann method is carried out to verify the theoretical *** numerical simulation agrees well with the theoretical analysis,showing the positive significance of the proposed micro ***,another novel micro structure of rough surface is presented,which combines the advantages of truncated pyramid geometry and noncommunicating roughness *** analysis shows that the novel micro structure of rough surface can effectively hinder the Cassie-Baxter state to Wenzel state transition,furthefly enhancing the robustness of the surface hydrophobicity.

关键词： truncated square pyramid geometry wetting transition energy barrier super-hydrophobicity lattice Boltzmann method

Cyclic stress-strain behavior of structural steel with yield- strength up to 460 N/mm^2

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Frontiers of Structural and Civil Engineering 2014年第2期8卷 178-186页

作者： yiyi chen Wei SUN Tak-Ming CHAN State Key Laboratory of Disaster Reduction in Civil Engineering Tong/i University Shanghai 200092 China Architecture Design & Research Institute of Tongji University (Group) Co. Ltd. Shanghai 200092 China School of Engineering University of Warwick Coventry CV4 7AL UK I

This paper presents a constitutive model based on Ramberg-Osgood equation to describe the hysteresis material behavior of structural carbon steel with nominal yield strength between 235 to 420 N/mm^2. The proposed model was calibrated against a series of cyclic material tests with strain amplitude varying from 0.5% to 2.0%. A simple relationship between the modular parameter K and the yield strengthfy was proposed. The calibrated Ramberg-Osgood model revealed excellent agreement with the experimental results and captured further the experimental behavior of test specimens with nominal yield strength of 460 N/mm^2. The proposed constitutive model was also adopted in conjunction with the combined kinematic/isotropic materials description in ABAQUS to mimic a full scale experimental test under cyclic loading. The numerical results revealed close agreement with the experimental observations.

关键词： constitutive model finite element analysis hysteresis curve Ramberg-Osgood equation

A model study on affordable steel residential housing in China

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Frontiers of Structural and Civil Engineering 2012年第3期6卷 288-296页

作者： Xin chenG Xianzhong ZHAO yiyi chen Zhenyu LI Department of Building Engineering Tongji UniversityShanghai 200092China Department of Architecture Tongji UniversityShanghai 200092China

The main research purpose of this paper is to acquire a series of designed concept of"affordable housing"in key geographical areas of East China through the development of innovative,economical,flexible,reproducible and affordable residential houses using intensive steel *** this goal,both the residential housing conditions and the development of steel residential building in China are widely *** housing in China is then,based on the investigation,defined as green humanized multi-storey housing comprised of medium-small type dwellings whose construction cost is not much higher than that of traditional reinforced concrete buildings and the maintenance cost is *** this definition as a guiding ideology,detailed architectural and structural design of a steel affordable housing model in terms of a collective housing form with repeatable living units has been carried *** of project cost and energy consumption between the designed steel residential housing and the corresponding reinforced concrete building show that the former is not more expensive and consumes less energy than the latter.

关键词： affordable housing energy-saving duplex design pure steel frame economic evaluation

Seismic performance of prestressed concrete stand structure supporting retractable steel roof

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Frontiers of Structural and Civil Engineering 2009年第2期3卷 117-124页

作者： yiyi chen Dazhao ZHANG Weichen XUE Wensheng LU State Key Laboratory for Disaster Reduction in Civil Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

The seismic behavior of a structural system composed of pre-stressed concrete stand supporting a retractable steel roof was studied,which is typically based on the prototype of engineering project of Shanghai Qizhong Tennis *** elasto-plastic finite element analysis and shaking table test,the following were investigated:the effects of roof configurations in opening and closing,the effect of pre-stress on the structural seismic response,and the failure mechanism of the spatial stand frame systems featured with circularly arranged columns and inverse-cone type *** was found thatthe roof status has great effect on the natural period,vibration modes,and seismic response of the whole structure,the stand response to horizontal seismic excitation is stronger in roof opening configuration than in closing state,and the response mode is dominantly translational rather than rotational,though the stand is characterized by its fundamentally torsional vibration *** study indicated that the pre-stressed inversecone stands can keep the system from global side-sway collapse under gravity loads,even in the case that most columns loose moment capacity.

关键词： retractable steel roof prestressed concrete seismic performance failure mode inelastic response shaking table test

A Numerical Study of Localized Plastic Deformationin Polycrystals

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Journal of Materials Science & Technology 2001年第2期17卷 211-214页

作者： chengjiang HUANG, Dianzhong LI, Changrong chen and yiyi LI Institute of Metal Research, Chinese Academy of Science, Shenyang 110015, China Chinese Acad Sci Met Res Inst Shenyang 110015 Peoples R China

A finite element formulation which derives constitutive response from crystal plasticity theory was used to examine localized deformation in fee polycrystals. The polycrystal model was an idealized planar array of 22 hexagonal grains. The constitutive description used is based on a finite strain kinematical theory that accounts for lattice rotations. Formation of shear bands was successfully modeled in both single crystal and polycrystals. Stress and strain distribution around triple junctions was also analyzed. Results show the distributions of stresses and strains are distinctly inhomogeneous. Stress and strain fields across grain boundaries are highly discontinuous. However, this discontinuity will be restrained when shear bands are fully developed.

关键词： A Numerical Study of Localized Plastic Deformationin Polycrystals

SPECIAL ISSUE： RELIGION AND SOCIETY： CROSS-CULTURAL COMMUNICATION：Peking University＇s role in China＇s Anti-Christian Movement in 1922-1927

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Social Sciences in China 2010年第1期31卷 184-197页

作者： chen yiyi Peking University

The paper gives an overview of the Anti-Christian Movement of 1922-1927, focusing on the role of Peking University faculty and students in the first stage of the movement. Statements by some important Peking University intellectuals, such as University President Cai Yuanpei （蔡元培） and Professors chen Duxiu （陈独秀）, Hu Shi （胡适）, Zhou Zuoren （周作人）, etc. are discussed in detail. Special attention is given to those comments that stand out as against ＂majority opinion＂. Neither the Communists nor the Nationalists were key leaders during the first stage of the movement. It was the clash of core Chinese cultural values with those of Christianity and the Chinese desire to industrialize a country overwhelmed by the Western powers that were instrumental in the instigation of the Anti-Christian Movement.

关键词： Anti-Christian Movement Peking University Cai Yuanpei cultural tolerance