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Complete band gaps in sandwich phononic crystal plates

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Complete band gaps in sandwich phononic crystal plates

GEOMETRICALLY NONLINEAR FINITE ELEMENT MODEL OF SPATIAL THIN-WALLED BEAMS WITH GENERAL OPEN CROSS SECTION

2011年全国压电和声波理论及器件应用研讨会

作者： xiaofeng Liu,Yuesheng wang,Yanfeng wang~* school of civil engineering,beijing jiaotong university,beijing 100044,PR china

＜正＞Phononic crystal plates have attracted much attention due to their excellent mechanical properties and adjustable band structures as well as extensive prospects in *** the finite element method（FEM）,the propag... 详细信息

关键词： Phononic crystals Plates Complete forbidden band

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Acta Mechanica Solida Sinica 2009年第1期22卷 64-72页

作者： xiaofeng wang qingshan yang school of civil engineering Beijing Jiaotong University Beijing 100044 China

Based on the theory of Timoshenko and thin-walled beams, a new finite element model of spatial thin-walled beams with general open cross sections is presented in the paper, in which several factors are included such as lateral shear deformation, warp generated by nonuni- form torsion and second-order shear stress, coupling of flexure and torsion, and large displacement with small strain. With an additional internal node in the element, the element stiffness matrix is deduced by incremental virtual work in updated Lagrangian （UL） formulation. Numerical examples demonstrate that the presented model well describes the geometrically nonlinear property of spatial thin-walled beams.

关键词： spatial beams thin-walled structures geometrically nonlinear finite element stiffness matrix

Loading and wrinkling analysis of membrane structures

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Science china(Technological Sciences) 2011年第10期54卷 2597-2604页

作者： yang qingshan TAN Feng wang xiaofeng school of civil engineering Beijing Jiaotong University Beijing 100044 China

Loading analysis,as one of the most crucial procedures in the assessment of safety of the membrane structures,is to check the adequacy of structural stiffness and the extent of membrane stress and deformation,thus ensuring the structural stability and avoiding the wrinkling of membrane *** this paper,the analysis procedures are presented and the wrinkling of membrane structure,representing a major behavioral performance of the structure,is included with the modified constitutive relationship *** for the judgment of the membrane wrinkling,the principal stress-strain criteria are ***,an integrated algorithm is developed,in which the Newton-Raphson method and updated Lagrange formulation are *** the proposed algorithm,two fabric roof structures are *** show that the presented method is feasible and reliable.

关键词： membrane structure loading analysis wrinkling analysis modified constitutive relationship

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矩形薄膜褶皱影响因素试验研究

建筑结构学报 2020年第10期41卷 182-189页

作者：王晓峰殷亮杨庆山北京交通大学土木建筑工程学院北京100044 重庆大学土木工程学院重庆400044

薄膜广泛应用于土木工程和航空航天工程领域。薄膜因荷载引起的褶皱变形会随多种因素的影响而呈现不同的变化特征,但目前相关研究较少。为此,通过矩形薄膜受剪试验,研究薄膜结构的褶皱影响因素及其对褶皱特征参数的影响规律。为减小边... 详细信息

薄膜广泛应用于土木工程和航空航天工程领域。薄膜因荷载引起的褶皱变形会随多种因素的影响而呈现不同的变化特征,但目前相关研究较少。为此,通过矩形薄膜受剪试验,研究薄膜结构的褶皱影响因素及其对褶皱特征参数的影响规律。为减小边界条件的误差扰动,研发高精度的试验装置。借助千分尺施加预张位移和剪切位移,采用激光位移传感器对褶皱变形进行非接触测量。根据褶皱幅值、角度、半波长和数量等特征参数的变化情况,研究剪切位移、预张位移、薄膜厚度等因素对褶皱变形的影响。结果表明:随着剪切位移的增加,褶皱幅值增大,褶皱数量增多而褶皱半波长减小,而褶皱角度未见明显变化;预张位移的增加能够显著减小褶皱幅值和半波长,但使褶皱角度增大、褶皱数量增多;增加薄膜厚度能够有效减小褶皱数量,但使褶皱幅值和半波长增大,而对褶皱角度的影响却很小。

关键词：矩形薄膜褶皱边界条件预张位移剪切试验褶皱参数

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受扭圆环薄膜褶皱变形的试验研究

土木工程学报 2020年第6期53卷 33-41页

作者：王晓峰刘启军杨庆山北京交通大学北京100044 中国联合工程有限公司浙江杭州310052 重庆大学重庆400044

通过对圆环薄膜进行受扭试验,研究薄膜的褶皱变形机理及其随影响因素的变化规律。为减小边界条件的误差扰动,研发高精度试验装置。通过砝码和同步装置对圆环膜施加预张力,借助旋转平台施加扭矩,采用激光位移传感器对褶皱变形进行非接触... 详细信息

通过对圆环薄膜进行受扭试验,研究薄膜的褶皱变形机理及其随影响因素的变化规律。为减小边界条件的误差扰动,研发高精度试验装置。通过砝码和同步装置对圆环膜施加预张力,借助旋转平台施加扭矩,采用激光位移传感器对褶皱变形进行非接触测量,主要研究边界条件、预张力以及膜厚等因素对薄膜褶皱变形及其特征参数的影响规律。结果表明:随着扭转角的增加,褶皱幅值逐渐增大,由于没有二次屈曲发生,褶皱数量和褶皱半波长没有明显变化;增大预张力能够有效提高薄膜刚度,从而褶皱幅值和褶皱半波长减小,但使褶皱数量增多;膜厚增加能够提高薄膜的抗弯刚度,在相同扭转角和预张力的情况下,褶皱数量减少,但使得褶皱幅值和褶皱半波长增大。研究成果揭示褶皱因素对褶皱变形的影响规律,有助于通过其影响特性对薄膜褶皱变形进行有效控制,保证薄膜结构的形面精度。

关键词：受扭圆环膜试验装置试验研究褶皱变形影响因素褶皱特征参数

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气-膜耦合作用下ETFE气枕的静力研究

建筑结构学报 2023年第4期44卷 158-166页

作者：王晓峰李卓然杨庆山北京交通大学土木建筑工程学院北京100044 重庆大学土木工程学院重庆400044

为了研究气-膜耦合作用机理,对方形乙烯-四氯乙烯共聚物(ETFE)气枕进行静力荷载试验,研究气-膜耦合作用及其随影响因素的变化规律。通过在上膜面均匀铺置沙袋对气枕施加均布荷载,获得膜面位移、内压和膜面矢高。通过与有限元分析结果进... 详细信息

为了研究气-膜耦合作用机理,对方形乙烯-四氯乙烯共聚物(ETFE)气枕进行静力荷载试验,研究气-膜耦合作用及其随影响因素的变化规律。通过在上膜面均匀铺置沙袋对气枕施加均布荷载,获得膜面位移、内压和膜面矢高。通过与有限元分析结果进行对比,校核试验结果的精确性。并通过将内充气体分别在恒质量和恒压情况下的试验结果进行对比,研究ETFE气枕的气-膜耦合作用特征及其随荷载、初始内压和气枕尺寸的变化规律。结果表明:气-膜耦合作用使气枕的上下膜面协同工作,共同承担外荷载、抵抗变形;随着荷载的增加,气-膜耦合作用逐渐增强;在荷载不变时,气-膜耦合作用随初始内压的升高而减弱,随气枕尺寸的增大而增强。

关键词： ETFE气枕气-膜耦合作用静力试验均布荷载内充气体恒质量内充气体恒压

平屋盖及双坡屋盖光伏系统风荷载特性试验研究

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建筑结构学报 2018年第10期39卷 21-28页

作者：王京学杨庆山刘敏张建北京交通大学土木建筑工程学院北京100044 北京交通大学结构风工程与城市风环境北京市重点实验室北京100044 重庆大学土木工程学院重庆400044

屋顶光伏系统在强风或极端风气候中破坏的现象时有发生,其风荷载是主要控制荷载之一。为研究平屋盖及双坡屋盖光伏系统的风荷载特性,通过刚性模型测压试验,分析这两种典型屋盖光伏板上、下表面风压及净风压的风压特性,给出全风向角下最... 详细信息

屋顶光伏系统在强风或极端风气候中破坏的现象时有发生,其风荷载是主要控制荷载之一。为研究平屋盖及双坡屋盖光伏系统的风荷载特性,通过刚性模型测压试验,分析这两种典型屋盖光伏板上、下表面风压及净风压的风压特性,给出全风向角下最不利极值吸力随附属面积的衰减曲线,并与美国加州结构工程协会（SEAOC）制定的平屋盖光伏设计规范以及已有文献建议的光伏板净风压随面积的折减曲线进行了对比。结果表明：平屋盖上光伏板的最不利净风压极值吸力大于双坡屋盖,随附属面积增加而衰减加快;平屋盖上光伏板的净风压与SEAOC规范给出的净风压设计值较为接近;当附属面积较大时,已有研究建议的光伏板设计风荷载取值偏于保守。

关键词：平屋盖双坡屋盖光伏系统风洞试验风荷载净风压极值风压

CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH university of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui university HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu university Institute of ScienceVaranasi Bandirma Onyedi Eylul university Bandirma Beihang university Beijing beijing Computational Science Research Center Beijing beijing Conveyi LTD Beijing beijing Glass Research Institute Co. LtdBeijing beijing Institute of Technology Beijing beijing Normal university Beijing Brown university ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad university Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo university Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central china Normal university WuhanHubei Central South university ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan china academy of engineering physics MianyangSichuan china building materials academy Beijing china Center of Advanced Science and Technology Beijing china Institute of Atomic Energy Beijing china Jiliang university HangzhouZhejiang china Nuclear Instrument CO. LTDBeijing china university of Geosciences Beijing china university of Geosciences WuhanHubei china university of Mining and Technology XuzhouJiangsu china West Normal university NanchongSichuan Chongqing university Department of PhysicsChongqing Chulalongkorn university Bangkok City university of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell university IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu university DalianLiaoning Dalian university of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East china university Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by china,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

受水平地震作用的古建筑木结构柱非线性响应研究

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建筑结构学报 2018年第S2期39卷 207-214页

作者：高潮杨庆山王娟杨娜北京交通大学土木建筑工程学院北京100044 北京交通大学结构风工程与城市风环境北京市重点实验室北京100044 重庆大学土木工程学院重庆400044

木柱是古建筑木结构中的核心受力构件之一,多以浮放的形式置于础石之上,类似于滑动铰接节点,二者之间仅存在摩擦接触。在水平地震作用下,木柱可能的运动方式包含静止、滑移、抬升、滑移-抬升等4种。为研究木柱在水平地震作用下的响应特... 详细信息

木柱是古建筑木结构中的核心受力构件之一,多以浮放的形式置于础石之上,类似于滑动铰接节点,二者之间仅存在摩擦接触。在水平地震作用下,木柱可能的运动方式包含静止、滑移、抬升、滑移-抬升等4种。为研究木柱在水平地震作用下的响应特征,基于考虑边缘尖角钝化的圆角木柱二维径向截面模型,推导了木柱在4种不同运动状态时的控制方程,给出了不同运动状态的判定条件,同时结合古建筑特征得到了木柱受水平地震作用可能产生的运动状态。研究了不同运动状态下木柱对地震能量的转化与耗散过程。以正弦激励为例,分析了典型木柱在地震作用下的响应特征。结果表明:在水平地震作用下,木柱的滑移、抬升、滑移-抬升分别对应二维圆角木柱平动、不定轴转动及平面运动;我国传统古建筑木柱受水平地震作用可能发生的运动状态有静止、仅抬升不滑移、抬升后滑移或滑移-抬升同时发生;木柱运动状态与其质量、细长比及柱顶荷载大小有关;柱顶荷载对木柱抵抗倾覆有明显效果;低频地震加速度更易导致柱脚钝化的木柱倾覆。

关键词：古建筑木结构木柱地震作用运动状态