镇罗黄河特大桥顶推施工过程分析

以镇罗黄河特大桥主桥为例,应用有限元软件分析顶推法施工阶段,对钢箱梁顶推施工进行仿真计算.通过分析钢箱梁在顶推施工过程中的受力性能、变形和关键位置应力等方面,研究整个钢箱梁的顶推施工过程.同时对顶推力大小进行预测,保证主梁在顶推装置的作用下平稳地推进,确保桥梁下部结构的安全性.结果表明:顶推施工期间中,钢箱梁各截面的应力值都在允许范围内;主梁和导梁各截面的变形满足施工中的要求.     

镇罗黄河特大桥顶推施工过程分析

以镇罗黄河特大桥主桥为例,应用有限元软件分析顶推法施工阶段,对钢箱梁顶推施工进行仿真计算.通过分析钢箱梁在顶推施工过程中的受力性能、变形和关键位置应力等方面,研究整个钢箱梁的顶推施工过程.同时对顶推力大小进行预测,保证主梁在顶推装置的作用下平稳地推进,确保桥梁下部结构的安全性.结果表明:顶推施工期间中,钢箱梁各截面的应力值都在允许范围内;主梁和导梁各截面的变形满足施工中的要求.     

镇罗黄河特大桥顶推施工过程分析

以镇罗黄河特大桥主桥为例,应用有限元软件分析顶推法施工阶段,对钢箱梁顶推施工进行仿真计算.通过分析钢箱梁在顶推施工过程中的受力性能、变形和关键位置应力等方面,研究整个钢箱梁的顶推施工过程.同时对顶推力大小进行预测,保证主梁在顶推装置的作用下平稳地推进,确保桥梁下部结构的安全性.结果表明:顶推施工期间中,钢箱梁各截面的应力值都在允许范围内;主梁和导梁各截面的变形满足施工中的要求.     

镇罗黄河特大桥顶推施工过程分析

以镇罗黄河特大桥主桥为例,应用有限元软件分析顶推法施工阶段,对钢箱梁顶推施工进行仿真计算.通过分析钢箱梁在顶推施工过程中的受力性能、变形和关键位置应力等方面,研究整个钢箱梁的顶推施工过程.同时对顶推力大小进行预测,保证主梁在顶推装置的作用下平稳地推进,确保桥梁下部结构的安全性.结果表明:顶推施工期间中,钢箱梁各截面的应力值都在允许范围内;主梁和导梁各截面的变形满足施工中的要求.     

勐古怒江特大桥总体设计

结合受控因素,勐古怒江特大桥主桥采用240m双塔空间扇形双索面分离式钢箱梁斜拉桥结构。索塔为钻石型箱型截面混凝土结构;主梁采用分离式钢箱梁结构。斜拉索采用镀锌平行钢丝成品索,设置减震器以抑制斜拉索振动;采用索塔端直接锚固于塔内混凝土齿块、梁端钢锚拉板与边腹板焊接的锚固形式。引桥采用40m标准跨径钢板组合梁,能有效加快施工速度和控制地震响应,促进钢结构在西南山区桥梁工程中的应用。     

连续钢箱梁桥抗倾覆稳定探讨

通过互通立交(27+41+27)m连续钢箱梁工程,对连续钢箱梁进行计算分析。本次分析采用MIDAS软件建立模型,考虑钢箱梁在最不利荷载组合下的最大内力,进行结构应力和挠度分析。     

某高速公路钢-混组合梁桥设计分析与研究

钢混组合梁结构是充分利用钢梁与混凝土的组合性能的优势,提升了桥梁结构安全、经济、美观等综合性能。以具体的钢混组合梁结构设计项目为例,桥面板为混凝土桥面,桥面板底设置2根槽型钢箱梁,通过剪力钉连接桥面板与槽型钢箱梁,横向是通过内横撑和箱间横梁连接,主要是从结构总体设计、结构的验算和施工工艺方法三个方面对钢-混凝土组合梁结构进行设计分析研究,结果表明该组合梁结构合理、安全可靠;进一步利用大型桥梁专用软件Midas/Civil建立钢-混凝土组合梁结构的有限元空间梁格模型并进行分析,理论计算结果表明,钢混组合梁桥力学性能满足规范设计要求;钢箱梁在制造加工、运输、吊装等过程中整体稳定性和刚度均满足要求。     

连续变截面钢板及碰撞吸能性能研究

连续变截面钢板(TRB)与等厚截面钢板和激光拼焊板(TWB)相比,在减重效果、机械性能和柔性优化设计等方面具有优势。文章论述了连续变截面钢板的优势与不足,并采用有限元仿真方法研究了连续变截面结构的碰撞吸能特性。用吸能比(SEA)、碰撞峰值力及压溃力效率(CFE)评价连续变截面圆管的吸能特性。结果表明,连续变截面圆管与拼焊圆管和等厚圆管相比,具有最优的吸能比,同时可以获得较小的峰值力及较高的压溃力效率。     

浅议钢箱梁制造及安装监理控制要点

我公司所承担监理的八一路延长线光谷大桥(庙湖段)全桥钢箱梁采用变截面连续钢箱梁,主线钢箱梁全长837m,共分为5联,2个钢箱梁匝道共计240m和9座钢桥墩共计约12000吨。施工监理过程中采取了有针对性的质量控制措施,有力地保证了钢箱梁、钢桥墩制造及安装施工质量,取得了良好的效果。     

145m长小半径曲线钢箱梁顶推施工关键技术

由于受到桥梁施工环境的限制，一些跨度较大、施工对交通影响较大的钢箱梁桥需采取顶推施工技术进行建造。针对某高速公路匝道桥钢箱梁联横跨长张高速及其下行匝道，钢箱梁位于半径为280m左右的曲线上，并且纵坡高差达1.816m，钢箱梁整体自重大。结合施工设计，施工采用步履式顶推装置进行多点顶推施工技术。通过对临时支墩、钢导梁的设计和顶推装置的科学选型，采用有限元软件对施工过程进行施工模拟仿真计算，确保施工结构稳定可靠。施工过程中针对小半径曲线钢箱梁的特点，对顶推作业采用顶推同步协调控制技术，动态监控钢箱梁的线形和姿态，及时纠偏，确保了钢箱梁的顶推架设顺利完成。     

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。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.