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超大截面超长跨度结构梁模架支撑系统安全性能研究
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作者 徐志 《中文科技期刊数据库(引文版)工程技术》 2021年第5期345-346,共2页
随着我国城市化的高速发展,对大空间公共建筑需求日益增加,其中结构构件的截面与跨度不断增大,也给模架的安全性也提出了考验,近年来,模架安全施工频发,看似简单的结构体系却存在很多理论分析的难题,规范中部分条款也需要进一步研究,本... 随着我国城市化的高速发展,对大空间公共建筑需求日益增加,其中结构构件的截面与跨度不断增大,也给模架的安全性也提出了考验,近年来,模架安全施工频发,看似简单的结构体系却存在很多理论分析的难题,规范中部分条款也需要进一步研究,本文以北京大兴新机场中地下一层宽度为2200mm,高度2500mm、跨度为27000mm的超大截面、超长跨度混凝土预应力梁与和型钢劲性梁支撑架体为主要研究对象,收集盘扣式模架受力和变形数据并统计分析,得出具有指导性的结果与模架设计建议。 展开更多
关键词 大截面梁 大跨度结构 模架监测 模架安全
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Construction of reasonable pillar group for undersea mining in metal mine 被引量:5
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作者 Zhi-xiang LIU Tian LUO +3 位作者 Xiang LI Xi-bing LI Zhen HUAI Shao-feng WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第4期757-765,共9页
In order to achieve the safe mining in Sanshandao Gold Mine,five schemes of secure pillar group are designed.Using the method of the renormalization group,the failure mechanism of the pillar group is explored,and the ... In order to achieve the safe mining in Sanshandao Gold Mine,five schemes of secure pillar group are designed.Using the method of the renormalization group,the failure mechanism of the pillar group is explored,and the safety factor of the pillar system is also obtained.The displacement characteristics,stress-strain laws,distribution of plastic zone and damage range of different pillar group are analyzed using numerical calculation software FLAC3D.To determine a reasonable pillar group scheme,the pillar stability and roof deformation are utilized to evaluate the safety of the pillar group.In addition,the theory of fuzzy comprehensive evaluation is adopted to verify the optimal scheme.The pillar group with the lowest roof deformation value is chosen as the optimal plan,which renders a factor of safety of 2.06 for the pillar group.According to this scheme,pillars with the width of 10 m are set along the strike of undersea deposit with the interval of 50 m.Rib pillars of 15 m in width are set at the location of the exploration line of 127,151 and 167.The analysis can be used to provide guidance for optimal design of pillar structures in undersea mining. 展开更多
关键词 undersea mining pillar group scheme safety factor numerical simulation fuzzy comprehensive evaluation
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On modeling of electrical cyber-physical systems considering cyber security 被引量:9
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作者 Yi-nan WANG Zhi-yun LIN +3 位作者 Xiao LIANG Wen-yuan XU Qiang YANG Gang-feng YAN 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2016年第5期465-478,共14页
This paper establishes a new framework for modeling electrical cyber-physical systems(ECPSs),integrating both power grids and communication networks. To model the communication network associated with a power transmis... This paper establishes a new framework for modeling electrical cyber-physical systems(ECPSs),integrating both power grids and communication networks. To model the communication network associated with a power transmission grid, we use a mesh network that considers the features of power transmission grids such as high-voltage levels, long-transmission distances, and equal importance of each node. Moreover, bidirectional links including data uploading channels and command downloading channels are assumed to connect every node in the communication network and a corresponding physical node in the transmission grid. Based on this model,the fragility of an ECPS is analyzed under various cyber attacks including denial-of-service(Do S) attacks, replay attacks, and false data injection attacks. Control strategies such as load shedding and relay protection are also verified using this model against these attacks. 展开更多
关键词 Cyber-physical systems Cyber attacks Cascading failure analysis Smart grid
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