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部分包覆钢-混凝土组合构件中主钢件翼缘的局部稳定性能研究 被引量:3
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作者 陈以一 林俊星 李杰 《建筑结构》 CSCD 北大核心 2021年第7期1-6,共6页
部分包覆钢-混凝土组合构件因两种组成材料的相互约束,能大幅增强H型钢翼缘的局部稳定性,因而设计时可以采用较大宽厚比的板件。增大冀缘宽厚比能提高钢材利用效率,但也存在降低构件承载能力和塑性变形能力的风险。对这类构件中钢翼缘... 部分包覆钢-混凝土组合构件因两种组成材料的相互约束,能大幅增强H型钢翼缘的局部稳定性,因而设计时可以采用较大宽厚比的板件。增大冀缘宽厚比能提高钢材利用效率,但也存在降低构件承载能力和塑性变形能力的风险。对这类构件中钢翼缘板受压条件下的局部稳定性能进行了研究,推导了弹性与弹塑性失稳条件下的临界应力与冀缘宽厚比;根据试验研究结果,分析了翼缘宽厚比和连杆间距对构件延性的影响;讨论了现行规范有关规定的合理性。结果表明:混凝土单侧约束能大幅提高钢板的局部稳定临界应力,并可由此推导出PEC构件中主钢件翼缘板的宽厚比限值;当设置连杆约束时,在一定范围内采用较密的连杆间距,可以满足较大宽厚比截面的塑性承载的要求。 展开更多
关键词 部分覆钢-混凝土组合构件 翼缘宽厚比 临界应力 连杆间距 局部稳定性 延性
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基于CCM构件的HLA仿真开发研究 被引量:1
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作者 张剑 《中国舰船研究》 2009年第6期70-74,共5页
HLA仿真作为新一代分布仿真体系结构,对仿真界产生了深刻影响。但是由于HLA与其它中间件技术没有建立广泛的联系,使得HLA的可重用性仅仅局限在HLA范围内,同时HLA的开发也具有很大的复杂性。在深入研究HLA仿真框架的基础上,提出了一种基... HLA仿真作为新一代分布仿真体系结构,对仿真界产生了深刻影响。但是由于HLA与其它中间件技术没有建立广泛的联系,使得HLA的可重用性仅仅局限在HLA范围内,同时HLA的开发也具有很大的复杂性。在深入研究HLA仿真框架的基础上,提出了一种基于CORBA构件模型(CCM)构件的HLA仿真开发方法,该方法利用CCM构件技术来实现各联邦成员的具体功能。该方法提高了软件重用率和仿真开发效率,并优化了HLA仿真系统的软件层次结构。验证中该方法成功运用于舰船作战系统联邦的指控系统联邦成员仿真。结果表明该方法确实可行。 展开更多
关键词 HLA CORBA构件模型 软件复用 构件包
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钢梁外包FRP混凝土抗弯承载力计算 被引量:4
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作者 周乐 王元清 +2 位作者 施刚 聂晓梅 白云皓 《沈阳建筑大学学报(自然科学版)》 CAS 北大核心 2014年第2期193-200,共8页
目的研究一种简化处理的不同破坏形态下构件极限抗弯承载力的计算方法,以方便工程实际的应用.方法采用实用叠加方法对SRHC梁贴FRP的受力过程和破坏特征进行研究.根据中和轴到钢骨的截面距离不同,将受压区高度与钢骨上翼缘至混凝土受压... 目的研究一种简化处理的不同破坏形态下构件极限抗弯承载力的计算方法,以方便工程实际的应用.方法采用实用叠加方法对SRHC梁贴FRP的受力过程和破坏特征进行研究.根据中和轴到钢骨的截面距离不同,将受压区高度与钢骨上翼缘至混凝土受压边缘的距离进行比较,以此来确定FRP加固后梁在破坏时的不同抗弯承载力的适用公式.基于纤维模型法,对受弯钢梁外包混凝土贴FRP布构件进行非线性全过程分析.结果提出了受弯钢梁外包混凝土贴FRP布构件承载力计算公式.通过实例表明,FRP的加固层数是构件受力性能重要的影响参数,在相同的变形条件下,FRP层厚度增加,组合构件的承载能力也有所提高,最佳加固率在3层以内.构件的承载能力随着混凝土强度的提高而提高.结论笔者给出的计算公式克服了简单叠加法和一般叠加法在计算上的缺陷,计算简便,可用于工程实际和结构设计中. 展开更多
关键词 FRP 受弯钢梁外混凝土贴FRP布构件 SRHC梁 破坏模式 受抗弯承载力 极限承载力 非线性分析
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H型钢腹板焊接栓钉的部分外包混凝土组合构件纵向受剪性能试验研究 被引量:10
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作者 胡夏闽 张婧 +2 位作者 张冰 赵庆 刘加荣 《建筑结构学报》 EI CAS CSCD 北大核心 2018年第3期158-166,共9页
通过13个在单调荷载作用下H型钢腹板焊接栓钉的部分外包混凝土组合构件的推出试验,对其破坏形态、荷载-滑移特性和纵向剪力传递性能进行了研究,分析了栓钉数量、栓钉直径、栓钉布置方式、型钢翼缘宽度、腹部混凝土箍筋布置方式及加载方... 通过13个在单调荷载作用下H型钢腹板焊接栓钉的部分外包混凝土组合构件的推出试验,对其破坏形态、荷载-滑移特性和纵向剪力传递性能进行了研究,分析了栓钉数量、栓钉直径、栓钉布置方式、型钢翼缘宽度、腹部混凝土箍筋布置方式及加载方式等对受剪承载力的影响。试验结果表明:H型钢腹板焊接栓钉的部分外包混凝土组合构件的主要破坏形态为外包混凝土劈裂破坏和栓钉剪断破坏;典型的荷载-滑移曲线可分为3个特征阶段,分别为无滑移阶段、荷载上升段及荷载下降段;腹部栓钉有效地提高了部分外包混凝土组合构件的纵向受剪承载力,且受剪承载力随栓钉直径的增大和栓钉数量的增加而增大;腹部栓钉纵向布置优于横向布置,栓钉纵向偏心布置对受剪承载力影响较小;宽翼缘型钢能更好地约束腹部混凝土,提高其受剪承载力;腹部箍筋不同布置方式对极限荷载的影响较小;通过分析构件的受力机理和纵向剪力传递模式,提出了H型钢腹板焊接栓钉的部分外包混凝土组合构件纵向受剪承载力算式,计算结果与试验结果吻合较好。 展开更多
关键词 部分外混凝土组合构件 栓钉连接件 推出试验 纵向剪力传递 受剪承载力
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基于Java的圈带动平衡机机构动力学的研究
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作者 于慧艳 白银辉 《现代制造技术与装备》 2021年第4期18-22,28,共6页
应用Java SWT/JFace GUI搭建界面,应用Java编制程序对圈带动平衡机机构动力学进行研究,介绍圈带计算参数的理论计算,发现了缠绕型变现象和缠绕参变现象,可为柔性构件动力学分析提供部分依据。此外,给出了圈带初始长度、工件直径与随轮5... 应用Java SWT/JFace GUI搭建界面,应用Java编制程序对圈带动平衡机机构动力学进行研究,介绍圈带计算参数的理论计算,发现了缠绕型变现象和缠绕参变现象,可为柔性构件动力学分析提供部分依据。此外,给出了圈带初始长度、工件直径与随轮5Y轴坐标、张紧机构的滑道范围、各部件包角、轴心力和摩擦力等参数的计算方法。应用外推法和黄金分割法,降低了软件的计算量,为智能控制、结构计算和寿命评估提供了数据支撑。 展开更多
关键词 JAVA 动平衡机 圈带长度 构件包 构件载荷
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防屈曲支撑结构的专利技术发展概况 被引量:4
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作者 成晓奕 冯志杰 《水利与建筑工程学报》 2017年第1期185-193,共9页
为研究防屈曲支撑技术的发展脉络及趋势,以防屈曲支撑的专利技术为载体,围绕支撑内芯的构造、外包约束构件的构造和减少轴力传递构造这三方面进行全面梳理与分析。从多角度对防屈曲支撑的机理、结构和材料进行定量和定性的研究,具有多... 为研究防屈曲支撑技术的发展脉络及趋势,以防屈曲支撑的专利技术为载体,围绕支撑内芯的构造、外包约束构件的构造和减少轴力传递构造这三方面进行全面梳理与分析。从多角度对防屈曲支撑的机理、结构和材料进行定量和定性的研究,具有多元化的特点。近年来,开始将"预应力自复位体系"引入防屈曲支撑之中。通过前述防屈曲支撑的专利技术分析,以期为研究开发具有自主知识产权的产品提供有益的借鉴和参考,以及为"强国制造"提供发展新动向。 展开更多
关键词 防屈曲支撑 支撑内芯 约束构件 间隙控制 专利技术
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Optimized body structure and packaging for car ODB impact performance 被引量:1
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作者 Men Yongxin Ma Fangwu +2 位作者 Wang Zhitao Wang Zelong Peng Hong 《Engineering Sciences》 EI 2012年第6期43-46,共4页
Front bumper, crash box and side rail are key body structural parts in front crash. Deformation space is affected by compartment packaging. The improvement suggestions are proposed to solve the problems existed in the... Front bumper, crash box and side rail are key body structural parts in front crash. Deformation space is affected by compartment packaging. The improvement suggestions are proposed to solve the problems existed in the current vehicle struc- ture and compartment packaging based on the areas that influence performance of automobile offset deformable barrier impact, such as the side rail, mounting, storage battery packaging,etc. It is proved that dO % offset crash simulation result of one certain car is well-correlated with the physical test. Optimization cases meet the crash performance requirements. The objec- tive of the analysis is to guide structural design and improves a car' s crash safety performance. 展开更多
关键词 PACKAGING offset deformable barrier impact body structure crash performance optimization
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Motivation in Information Searching Through "Mobile News" by Malaysian Youth
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作者 Akmar Hayati Ahmad Ghazali Siti Zobidah Omar 《Journalism and Mass Communication》 2015年第6期263-269,共7页
The rapid development of communication technology, have changed the landscape of information searching especially among youth. Youth are increasingly inclined to seek information using the new media such as mobile new... The rapid development of communication technology, have changed the landscape of information searching especially among youth. Youth are increasingly inclined to seek information using the new media such as mobile news. Nevertheless, the massive information flows have caused difficulties in finding quality, relevance and credibility of information. Hence, this study was undertaken to identify the problems encountered by the youth when searching for information through mobile news; to recognize the motivational factors in searching information through mobile news; and to find out the acceptance factor in searching information through mobile news. The underlying theory in this research is using Diffusion of Innovation Theory (DOI). Employing a quantitative approach, a total of 400 respondents from higher learning institutes were selected to be the respondents of this study. The data were analyzed using Statistical Package for Social Science (SPSS) version 21.0. Results of the study show that the problems faced when seeking information through mobile news is information disorder. Further, motivational factors that encourage information seeking through mobile news by youth are related to advantage and observability. At the same time, seeking information through mobile news is accepted by the youth due to their perceived ease of use. In conclusion, it is hoped that the mobile news could be one of the leading learning medium among the youth in the future. 展开更多
关键词 M-news INFORMATION YOUTH needs motives
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Micro Credit is a Tool for Women Entrepreneurship Development
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作者 Rathiranee Yogendrarajah Semasinghe S.D 《Journal of Mathematics and System Science》 2015年第9期385-390,共6页
As a result of 30 years of an internal armed conflict, women and children not only lost male relatives in struggle, but comprised of the displaced. Most of the households in Sri Lanka are now headed exclusively by wom... As a result of 30 years of an internal armed conflict, women and children not only lost male relatives in struggle, but comprised of the displaced. Most of the households in Sri Lanka are now headed exclusively by women. The micro finance institutions help the poor people in effective ways in order to generate income to enhance their standard of living in the rural areas. This study focuses on women entrepreneurship development through micro credit programme under post war development in Jaffna District selecting four rural areas which are Kopay, Chavakachcheri, Varani and Kodikamam. The main objective of this study is to identify the linkage with micro credit programmes and entrepreneurship development. Further it has an objective to identify the impact of micro credit on entrepreneurship development. The information has been gathered by primary data which has been distributed through the close ended questionnaire to the rural women in the above selected areas and seventy seven (77) responded out of 100. The relation between the micro credit programmes and women entrepreneurship development is examined using Statistical Package for Social Sciences (SPSS). It is concluded that the Entrepreneurship development has a significant relationship (p〈0.05) with the microcredit programme and its impact on entrepreneurship development is crucial. It is suggested that the microcredit facilities are essential in women entrepreneurship development under post war development. 展开更多
关键词 Entrepreneurship Development Micro credit Post war development and Women Empowerment.
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The Influence of Social Dimensions on Bribery in Public Sector Institutions in Libya
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作者 Salem M. Abdelgader 《Sociology Study》 2013年第2期114-133,共20页
This paper investigates social dimensions in the Libyan family and their relationship to the common practice of bribery. In Libya, bribery is most noticeable in administrative contexts where other practices such as fa... This paper investigates social dimensions in the Libyan family and their relationship to the common practice of bribery. In Libya, bribery is most noticeable in administrative contexts where other practices such as favouritism, fraud and forgery are also found. The paper aims to make an original contribution to knowledge in a little-researched area by examining social dimensions and cultural practices. The paper is based on the basic assumption that there is a relationship between accepting bribes and social dimensions surrounding the family in Libya and will thus also examine bribery as a social culture, by means of a set of variables such as gifts, promises, assistance and loans. The study took place in Benghazi, Libya, where the number of employees exceeded 200. The study was conducted using an interpretative epistemology and a quantitative method. Data were collected using quantitative research instruments and the Statistical Package for the Social Sciences (SPSS) was used to analyse the data. The findings of the study suggest that there is a relationship between family relationships, social status and the commission of the crime of bribery except for variables of social status and cultural background, in addition to the social relationship's effect on administration. 展开更多
关键词 FAMILY BRIBERY social dimensions institutions
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Housing Correlates of Under-Five Mortality in Urban Ethiopia
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作者 Hadgu Bariagaber 《Sociology Study》 2015年第3期184-202,共19页
Little studies and analysis have been undertaken to investigate the housing determinants of under-five mortality in Ethiopia. This study, therefore, explores the impacts of urban housing variables on the levels and pa... Little studies and analysis have been undertaken to investigate the housing determinants of under-five mortality in Ethiopia. This study, therefore, explores the impacts of urban housing variables on the levels and patterns of under-five mortality in the country based on the SPSS (Statistic Package for Social Science) file of the 2005 Ethiopian Demographic and Health Survey (EDHS). This survey covered a sample of about 4,420 households/housing units of urban Ethiopia. The under-five deaths are computed for women in the age group 15-49 by subtracting the number of children living from children ever born (CEB) and established the proportion dead by dividing deaths by CEB corresponding to the categorical variables of housing structure, facilities, and household durables. The analytical techniques of the study included univariate, bivariate, and multivariate data analysis of the proportional variations of childhood mortality patterns being manifested by "bar graphs" with respect to housing situations as well as household durables. Amongst the categorical variables of the housing structures, facilities, and household durables with the highest no prevalence of under-five mortality levels are found to be the units of unconventional walls, thatched/leaf/reed roofing, animal dung flooring, shared pit latrine/use of bucket/bush, using kerosene, firewood/straw/charcoal for cooking, unconventional lighting, unprotected water supply, households with no durables. 展开更多
关键词 HOUSING under-five mortality CORRELATES descriptive statistics
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The Impact of Innovation in Small Industrial Operations to Increased Competitiveness: Empirical Evidence
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作者 Luis Aguilera Enriquez Martha Gonzalez Adame Octavio Hernandez Castorena 《Chinese Business Review》 2014年第7期466-475,共10页
The present research work in the Small and Medium Enterprise (SME) and industrial sector explains the impact of the relationship among innovation in the SME operations of Aguascalientes to find the most competitive ... The present research work in the Small and Medium Enterprise (SME) and industrial sector explains the impact of the relationship among innovation in the SME operations of Aguascalientes to find the most competitive one; to this end, a questionnaire was intended for managers where the results have been analyzed using the statistical package Structural Equation Modeling Programs (EQS) support which through structural equations has responded to the objective. In this sense, it can be concluded that innovation has a positive relationship with the operations and in turn, this relationship shows a positive impact on the competitiveness of SMEs in Aguascalientes. For this study, a sample of 150 companies has been used. 展开更多
关键词 INNOVATION operations COMPETITIVENESS industrial Small and Medium Enterprise (SME)
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双H形钢部分包覆钢-混凝土组合柱压弯试验研究 被引量:14
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作者 宋世明 李杰 +1 位作者 陈以一 詹欣欣 《建筑结构学报》 EI CAS CSCD 北大核心 2019年第S01期171-178,共8页
欧规EN 1994-1-1中仅列入了双H形钢部分包覆钢-混凝土组合(PEC)构件的截面形式,但对其压弯承载力计算方法和截面构造都未予以明确规定。为此,设计了3类截面形式的正交双H形钢PEC柱试件,对其进行了压弯条件下的往复加载试验,并将试验结... 欧规EN 1994-1-1中仅列入了双H形钢部分包覆钢-混凝土组合(PEC)构件的截面形式,但对其压弯承载力计算方法和截面构造都未予以明确规定。为此,设计了3类截面形式的正交双H形钢PEC柱试件,对其进行了压弯条件下的往复加载试验,并将试验结果与采用作者前期提出的单向压弯及双向压弯承载力计算方法的计算结果进行比较。结果表明:钢翼缘对混凝土有明显的约束作用;试件在单向压弯和双向压弯下具有相同的抗弯刚度和承载力,均表现出了良好的塑性变形能力和耗能性能,加强箍筋可以提高试件的延性;前期提出的压弯承载力计算方法得到的压弯承载力与试件结果相比偏于安全,而相比于欧洲规范EC4的计算方法又具有一定的经济性。 展开更多
关键词 部分覆钢-混凝土构件 双H形钢主钢件 截面构造方式 拟静力试验 压弯性能
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New progresses on geothermal history of Turpan-Hami Basin,Xinjiang,China 被引量:1
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作者 柳益群 袁明生 +2 位作者 周鼎武 冯乔 荐军 《Science China Earth Sciences》 SCIE EI CAS 2001年第2期166-176,共11页
A comprehensive study on geothermal history of the Turpan-HamiBasin by vitrinite reflectance, fluid inclusion geothermometry, apatite fission track and 40Ar-39Ar dating displays that the main effects influencing geote... A comprehensive study on geothermal history of the Turpan-HamiBasin by vitrinite reflectance, fluid inclusion geothermometry, apatite fission track and 40Ar-39Ar dating displays that the main effects influencing geotemperature distribution are burial depth of the basement, heat flow, magmatic activities, as well as tectonic movement, having a rugulation to be higher in the east and north, lower in the west and south, as well as higher in the past and lower at the present. The heat of the mantle source and the Indo-China tectonic thermal event have extremely influenced matura-tion of source rocks of the upper Lower Permian and the Middle and Upper Triassic in the lndo-China epoch. While, the geothermal gradient and the weak tectonic geothermal event of the Early Yanshan Movement provided necessary heat for the maturation of source rock in coal-bearing strata of the Middle and Lower Jurassic. 展开更多
关键词 Turpan-Hami Basin geothermal history geothermal gradient tectonic thermal event vitrinite reflectance fluid inclusion geothermometry apatite fission track
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