非对称荷载作用下大直径浅圆仓的内力计算

大直径浅圆仓是最近国家储备库建设中出现的新仓型,在受非对称荷载作用下却没有相应的算法.本文分析了大直径浅圆仓内物料流动形态,给出了大直径浅圆仓在偏心卸载时的计算模型和公式.最后本文利用ADINA程序对某算例进行了计算及分析.     

浅圆仓散料侧压力计算的一种新方法

我国在1995年“利用世界银行贷款改善中国粮食流通”项目中首次引进浅圆仓。这种新仓型具有容量大、占地面积小、吨粮造价底、易于实现机械化作业等优点,比较适合我国国情,是我国粮仓建设的一个潜在发展方向,并可用于煤炭、化工、建材等行业。但到目前为止,大直径浅圆仓仍作为一种特殊仓型在探索之中。现在浅圆仓的直径越做越大,它的侧压力再按传统的浅仓公式计算是否合理,是值得研究的问题。     

大直径粮食浅圆仓仓壁压力测试与分析

对江苏徐州某粮食储备库中 3座大直径浅圆仓在粮食重量作用下仓壁所受侧压力 ,进行了现场实仓试验 ,同时又采用不同的理论分析方法进行了计算。理论值与实测值的比较分析表明 ,浅圆仓侧壁压力采用Column公式较为合理。结论可供浅圆仓设计者参考使用     

大直径粮食浅圆仓仓壁压力有限元分析及验证

为了更合理地设计粮食浅圆仓,需要对浅圆仓所受的主要荷载--侧压力进行深入研究.基于这个目的,将粮食体看作连续介质,根据轴对称问题的处理方式,取浅圆仓内粮食体的一个子午面作为研究对象,运用Bishara模型编制了一个用来计算这种侧压力的程序,并在江苏徐州国家粮食储备库进行了大直径浅圆仓在粮食重量作用下仓壁所受侧压力的现场实仓试验.通过实仓实测结果与程序计算结果的比较,说明用所编制的程序来计算浅圆仓仓壁侧压力是可靠的.     

浅圆仓仓壁侧压力分析

本文提出一种计算浅圆仓侧压力的力学模型 ,并推导出新的计算公式。其计算结果与实测值符合良好。此公式计算简单 ,适用范围广 ,为浅圆仓的设计提供了一种合适的计算方法。本文还比较并检验了库仑公式的计算结果     

新《钢筋混凝土简仓设计规范》附录C的应用

中华人民共和国国家标准《钢筋混凝土筒仓设计规范》(GB5 0 0 77 2 0 0 3)已于 2 0 0 4年1月 1日起实施。其中附录C 浅圆仓贮料压力计算公式是老规范GBJ77 85中所没有的、全新的内容。这部分内容意在解决大直径浅圆仓仓壁上的水平侧压力的计算问题 ,合理地解决了仓壁顶面以上的料堆引起的超压问题。本文阐述这些公式的使用方法。     

浅圆仓仓顶钢结构支撑的设计与施工探讨

本文介绍一种大直径浅圆仓装配整体式钢筋混凝土锥形仓顶施工过程中 ,采用的设计与施工方法。该方案利用仓壁滑模操作平台作为仓顶安装用钢结构支撑的底层拉杆 ,同时兼作钢结构支撑自身的施工安装平台 ,解决了类似工程钢结构支撑易失稳的技术难题 ,对同类工程的施工很有参考价值     

大直径浅圆仓滑模施工工艺研究

以中央储备粮长乐直属库松下港仓储物流项目为例,对大直径浅圆仓滑模施工工艺进行了深入研究,包括滑模组织与调试、滑模提升、终止滑升和滑模拆除施工技术要点,以期为浅圆仓滑模施工提供有益的参考。     

浅圆仓静态压力有限元分析

用有限元法计算了浅圆仓静态压力,计算结果与我国筒仓设计规范中的浅圆仓公式吻合良好。     

大直径浅圆仓侧压力计算的总体平衡法

采用总体平衡方法给出了一个新的大直径浅圆仓散体静态侧压力计算公式,该公式计算简单,并可用于储料顶部为平顶和锥顶两种情况。本文公式的计算结果经与实仓测试结果、国家规范和库仑公式对比分析表明,本文公式的计算结果与实仓测试结果吻合良好,本文公式的计算精度和吻合趋势好于国家规范和库仑公式。     

四季茶花新品种研究进展及其园林应用

四季茶花新品种是通过杜鹃红山茶与传统茶花品种杂交获得的新一代茶花品种类群.通过回顾杜鹃红山茶开发利用情况以及中国茶花新品种育种历程,阐述四季茶花的5大性状,证明这些新品种是对传统茶花的一场革命和有力的补充.最后,结合园林应用案例展示了新品种美化环境效果,以期推动四季茶花新品种的推广应用.     

The Turn to ‘New Regionalism’: South African Reflections

This article analyses critical policy implications for city-regional and national spatial frameworks in South Africa concerning the turn to new regionalism. International debates are reviewed concerning new regionalism, global city regions, the European Spatial Development Perspective and polycentric mega regions. In South Africa, there is a growing policy interest in the writings and implications of new regionalism as a base for rethinking urban and regional development policies. It is argued that the current depth of South African research and debate on issues raised by new regionalism is limited and that strategic planning for the building of Gauteng as a globally competitive city region is the most significant imprint of new regionalism on the South African policy landscape.     

Development of Suburban New Towns in Shanghai: Jobs-Housing Spatial Relationship Analysis

This paper identifies the employment and housing locations of residents in Shanghai based on mobile phone signaling data, so as to obtain the employment density and commuting data and analyze the development of nine suburban new towns from the perspective of jobs-housing spatial relationship. Firstly, the paper defines employment-intensive areas and gets the average employment density of each new town according to the employment density data. Then it marks out the scope of the employment influence through analyzing the sources of workers in each new town in accordance with the commuting data. Finally, it analyzes the jobs-housing balance of each new town using independence index, finding that suburban new towns in Shanghai have become main clusters of economic activities, while the scope of employment influence in each new town is still concentrated in its administrative area, with less attraction to residents in other areas. The independence index demonstrates a law that the suburban new town which is farther from the central city sees a higher degree of jobs-housing balance. Among them, new towns located in the outer suburbs with a low independence index indicate their special development situation, the reason of which is worth further study.     

对高层房屋建筑施工技术的分析与思考

普通高层建筑从专业角度来说就是采用新工艺新技术结合新能源新材料构建起来的建筑物，高层建筑也是一个国家地区和城市科技经济发展水平的重要标志。本文笔者就目前我国高层建筑施工技术的一些情况对其施工进行一系列的探讨和研究。     

新农村绿色住宅设计研究

新农村住宅设计是住宅建设的重要组成部分。在全球资源日益短缺的今天,建设新农村绿色住宅——即建设适应我国国情的"节能省地型"住宅,实现住宅建设的可持续发展,对构建和谐社会显得尤为迫切。在总结以往研究理论的基础上,对新农村绿色住宅概念、特征,及实现途径进行阐述,以期为我国新农村住宅建设的可持续发展做出贡献。     

英国新城发展与建设

英国的新城运动起源于埃比尼泽·霍华德的田园城市。新城项目的实施是将一个简单的想法转变成一个巨大的社会程序 ,英国的新城开发虽然被划分为三代 ,但实际上主要集中在第一代和第三代的新城建设上。第二代只有一个新城。第一代新城面临的主要问题是“新城忧郁症”。新城的开发建设 ,最佳机制是设置一个新的、专门的机构来建设新城。地方政府的机制不适合承担新城这样规模的建设。新城发展公司的资金来源完全来自中央政府 ,通过中央统一基金提供预付款项。这些预付款实际上是贷款 ,需要偿还。尽管英国目前已不再有政府资助的新城开发建设运动 ,但私营机构仍然计划进行所谓的“花园郊区”或者新居住区的开发。然而至今为止 ,这些新城开发建设的建议未得到地方或中央政府的批准     

The quality of conversations in participatory innovation

In co-design there seems to be a widespread understanding that innovation is a planned, goal-oriented activity that can be propelled forward through well-facilitated events in which company employees collaborate with external parties (users in particular) and the conversations aim at consensus about new product and service ideas. Conflict belonged to the ‘old days’ when participatory design played a part in the struggle between workers and management. Based on the theory of complex responsive processes of relating, we suggest a new way of understanding innovation as the emergence of new meaning in – often conflictual – conversations. We argue that the meeting of participants with different stakes is crucial precisely because crossing intentions can create new insight and movement of thought and action. We use improvised theatre to investigate what happens in industrial (and other) organisations that embark on participatory activities, and the barriers that prevent them. By analysing improvised scenes and the way the audience reacts, we characterise the quality of conversations that seems to allow new meaning to emerge and thus stimulates innovation. We suggest that we need to develop new formats of collaboration for large, complex contingents of stakeholders, where conflicting intentions are encouraged.     

浅谈数字化城市管理存在的问题及对策

在城市管理工作中，数字化城市管理一个新的管理模式，在城市管理工作中有了新的管理思路，它是城市管理中新的突破。但在当前的管理工作中，仍然存在着一些瓶颈问题，严重影响了城市管理工作的发展。     

New index indicating the universal and separate effects on human comfort under outdoor and non-uniform thermal conditions

The purpose of this study is to propose new thermal index for outdoor and non-uniform environments with heat conduction, such as when a person sits on a bench at a park. This paper describes mathematically the theory of how solar radiation and heat conduction, as well as air temperature, humidity, air velocity and longwave radiation, are incorporated into the new index and how these thermal factors that may not be uniform are treated. Another important feature is that separate indices are generated for each factor while the new index is derived. It is expected that the new index will help us to understand how much each factor affects the human thermal comfort in outdoor and non-uniform environments with heat conduction.     

Outstanding knowledge competences and web 2.0 practices for developing successful e-learning project management

The article deals with the knowledge competences that a project manager has to develop to succeed when using the new web 2.0 environments. In order to achieve this, a literature review of the main leading e-learning models is carried out, along with a study of the key factors that affect project performance positively. The new Web 2.0 environments invite us to an alternative reality where the use of its tools can offer new possibilities in the development of e-learning projects, identifying under what conditions value is added: efficiency, innovation, complementarity and loyalty. As a guide of new researches, we conclude that the project manager must modify the existing key competencies (Pedagogical, Management, Technical and Social ones) and to develop new ones based on knowledge management to be successful in managing this web 2.0 e-learning project.