连续刚构桥施工用三角形挂篮仿真分析

由于三角挂篮为空间结构形式,在分析计算时,应采用空间计算模型来分析,以获得与实际受力相一致的结果。本文采用通用有限元程序ANSYS对水打田2号特大桥悬臂施工中使用的三角形挂篮进行仿真计算,以确定挂篮在施工中各构件的受力性能,为该挂篮使用提供理论保障。     

某大桥梯形挂篮设计与结构受力分析

以某大跨径预应力连续刚构桥梁为工程背景，简要介绍了悬臂浇筑梯形挂篮的设计，并利用有限元软件建立了梯形挂篮施工仿真分析模型，分别计算得到了在浇筑混凝土状态和空载行走状态时的各构件强度、刚度、位移及整体抗倾覆稳定性，计算结果均满足设计要求，并具有一定程度的安全储备，可为类似桥梁悬臂浇筑挂篮设计和施工提供理论依据和实践参考。     

三角挂篮设计施工技术研究

三角挂篮拼装简单、灵活,拼装可在桥面完成,净空小,减小了塔吊塔架高度,能明显降低安全风险.文章介绍了三角挂篮的优点,以及三角挂篮的结构及工作系统,为三角挂篮在此类桥梁施工中的应用提供一定的借鉴作用.     

双组桁三角挂篮在高墩大跨连续梁中的应用

随着西南山区高速铁路的大规模建设,为跨越沟谷而设置的高墩大跨悬臂浇筑连续梁也随之增多,岔河特大桥双组桁三角挂篮的设计、计算及应用,具有一定的代表性,通过总结双组桁三角挂篮的设计、计算过程及在施工应用中的经验,在施工中加强挂篮走行、定位、浇筑及梁体线形控制工作,优质高效地完成了岔河桥连续梁施工。     

连续梁悬浇施工综合控制技术

以白水河及颍河大桥施工为例,介绍预应力连续刚构桥的三角挂篮施工与菱形挂篮施工技术。     

陈村特大桥主桥箱梁挂篮施工安全控制

挂篮施工在桥梁当中是一种很常见的施工方法，但是我们还是能看到一些关于挂篮施工的安全事故，这就提醒我们安全控制是保证施工安全的手段之一。文章结合陈村特大桥，从三角挂篮的拼装、行走等几方面，介绍了挂篮施工的安全控制要点。     

三角桁架型挂篮在跨线桥梁悬臂施工中的应用探究

参照兴城大桥主桥挂篮悬臂浇筑专项施工方案,对三角桁架型挂篮的结构设计和工程技术进行具体分析,主要从吊挂系统、模板平台系统、后锚固系统、主桁系统和走形系统等方面进行讲解,并阐述了挂篮结构的适用性和三角桁架型挂篮的施工方法。三角桁架型挂篮技术应用于跨线桥梁工程中收获了良好的效果。     

某大桥挂篮悬臂浇筑施工关键技术

挂篮施工是指浇筑较大跨径的悬臂结构时,采用吊篮方法,分段安装顸应力筋、管道、模板,并分段浇注粱段混凝土的施工方法.文章通过分析某大桥的施工特点,选定了挂篮悬臂法施工方案,阐述和总结了该工程构件选材、构件安装、混凝土浇筑、变形监测、体系转换等几个关键技术的具体做法,以期为同类工程提供参考.     

菱形挂篮优化设计

本文对菱形挂篮进行了优化设计和检算,可用优化后菱形挂篮主桁架、底模等构件做悬臂箱梁0#块的牛腿托架施工,改进了挂篮施工工艺,提高了菱形挂篮的经济价值和施工安全质量。     

山区陡壁带装配式托架及挂篮一体化设计施工技术

本文提出一种无落地超长装配式托架及挂篮一体化施工工艺,即使用菱形挂篮构件改装成装配式托架,并在普通三角托架施工工艺的基础上进行优化设计,将托架设计成不同长度且以法兰连接接长的标准节段,并在标准节段上的杆件连接处及墩身承重牛腿上设置销轴连接孔,通过将标准节段加工组合成模块后进行整体安装及拆除,在挂篮反压和挂篮施工中循环使...     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Export Composition and Manufacturing Employment in the US during the Economic Downturn of 1991-92

This paper examines the effect that export composition had upon manufacturing employment in the US during the 1991 recession. Although it takes, on average, approximately $66 000 in exports to create one job, the exact gains in terms of total employment depend upon the labour-intensity of the products being exported. Foreign sales by the chemical and textile industries result in a far greater increase in employment than exports by the petroleum refining or steel industries. This analysis estimates the employment effects of manufacturing exports over the 1989-95 period, utilizing an input-output model to capture both direct and indirect effects. The results demonstrate that export composition has, at times, both strengthened and reduced demand for labour. Consequently, if job-creation is a national goal, it may be in the interests of the US to promote exports from sectors that are labour-using.