某大桥连续刚构主桥承载能力试验研究

对新建桥梁进行承载能力检测是竣工验收的重要内容,而静载试验是评定承载力最可靠的方法,对某连续刚构桥进行静载试验,测试了各工况下控制截面的应力、挠度及对应的残余量,并计算了各测点的校验系数。结果表明:应力校验系数在0.59～0.68,挠度的校验系数在0.59～0.71,相对残余应力的最大值为3.45%,相对残余变形的最大值为6.61%,满足公路-I荷载的使用要求。     

大跨径连续刚构桥加固后荷载试验研究

利用Midas/Civil对某桥进行结构计算,结合某大桥加固后的实际情况,进行了动静载试验,分析桥梁结构在荷载作用下的应力、挠度、结构的自振特性及在试验荷载作用下的动力响应,确定桥梁的承载能力是否满足正常使用状况的要求,评价桥梁加固效果。     

空腹式拱桥承载力评定及有限元分析

为了评价空腹式拱桥在荷载作用下的受力状况和工作性能,通过荷载试验与有限元分析对桥梁承载力进行评定。静载试验是在偏载和中载的作用下主拱圈各断面测点应力和位移值的测试;动载试验是通过脉动试验和跑车试验来测试该桥的固有基频、阻尼比和冲击系数。结果表明:在各荷载作用下,本桥挠度和应变的校验系数均未超出标准容许值1,结构实际工作性能很好,相对残余应变和残余变形最大值分别为14.33%和9.25%,都未超出标准容许值20%,桥梁整体处于弹性变形阶段;在动力荷载作用下,拱桥第1阶竖向自振频率为5.997,阻尼比为0.009%,测试应变冲击系数介于1.075~1.137,竖向实测基频大于计算基频,桥梁整体刚度满足设计规范。     

基于静载试验的板桥检测及性能分析

为了评价桥梁的工作性能,提高道路安全性,通过采用荷载试验法对山西省某预应力空心板简支梁大桥进行了实地静力荷载试验.通过分析跨中最大弯矩试验,偏载试验工况下检测截面的挠度值、应变值等参数,得到截面承受最大正弯矩,截面承受最不利偏心荷载时结构的空间受力性能.结合测点挠度、应变相对残余变形校验系数,最终得到该桥整体刚度,控制截面强度性能,为桥梁安全研究提供了一种新的思路.     

荷载试验在桥梁检测中的应用

桥梁荷载试验可以准确、直接地测量出桥梁的结构特性,为桥梁检测提供基础的评价指标。文章基于项目实践与经验,就荷载试验在桥梁检测工作中的应用展开探讨。实践证实,不同的桥梁项目中要结合实际情况进行荷载试验的布置设计,加载设备、数据处理等环节都是试验过程中关键技术环节。为精确有效地进行桥梁承载力、可靠度等方面的评估,应优化荷载试验过程、利用好试验结果,进而保证桥梁发挥出最大的社会经济效益。     

珠江黄埔大桥北汊斜拉桥静载试验研究

介绍珠江黄埔大桥北汉桥主桥斜拉桥的静载试验的主要内容和方法,并结合理论计算,对静载工况下的主梁挠度、主塔塔顶变位、斜扣索索力增量、主梁与主塔相应的截面应力作用进行分析.试验结果表明主梁、塔在使用荷载下均处于弹性工作状态,桥跨结构设计合理,具有良好的强度、刚度和动力特性,桥梁结构满足设计要求.     

周期荷载下钢筋和混凝土的粘结性能研究

混凝土在周期荷载下粘结性能的退化主要与荷载循环结束时所能达到的最大滑移量有关。而滑移量的大小主要受到最大及最小周期应力水平、荷载循环次数、加载方式(应力或位移控制)、幅值类型(等幅或变幅加载)、加载频率及幅值加载的顺序等因素的影响。     

轨交桥梁挠度与温度变化关系研究

本文采用桥梁温度、挠度自动化监测系统，采集了一段时间轨道交通连续梁桥的挠度及温度数据，根据实测数据分析了桥梁挠度与温度变化的关系。结果表明：对该桥梁而言，桥梁挠度变化与温度变化呈线性相关，外部荷载使桥梁产生了不可逆的塑性变形，致使挠度不断增长。采用本文分析方法建立的桥梁挠度与温度的经验公式，可为类似结构桥梁的挠度分析提供参考。基于实测数据优化后的桥梁挠度预警模型，可为行业内提供更加符合实际的评估桥梁安全性的方法。     

智能全站仪在大跨径桥梁荷载试验中的实践

智能全站仪在现代测量工作中发挥着积极作用,能够有效支持大跨径桥梁荷载试验的稳步实施。文章从分析智能全站仪在大跨径桥梁荷载试验中的重要性入手介绍徕卡T60智能全站仪,并从静载试验和动载试验两个方面,阐明了荷载试验中对智能全站仪的应用情况,列举某工程实例阐述智能全站仪的应用效果,为大跨径桥梁实施荷载试验工作提供了借鉴和参考。     

某V撑刚构桥荷载试验研究

荷载试验作为桥梁投入使用前验收的一项重要指标，对桥梁整体性能的评定具有重要的意义，通过外观调查及技术状况评定，掌握桥梁的施工质量情况。通过测试结构主要受力构件在设计荷载作用下的受力性能，掌握桥梁结构的实际工作状况，判断结构受力是否正常及是否满足设计要求。通过桥梁在静载试验荷载下的实际工作状态，判定其承载能力和使用条件。掌握桥梁结构的动力性能。测试结构在动力荷载作用下的振动响应，掌握桥梁结构的主要动力性能指标(主要包括荷载冲击系数、自振特性等参数)，从整体上了解结构的工作状态。从而对桥梁承载能力作出综合技术评定。并根据检测结论，提出桥梁养护或维修建议或方案。     

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.