浅谈工程加固

分析了工程加固的意义,介绍了常见的几种加固方法,包括增大截面加固法、粘贴钢板加固法、碳纤维加固法、砌体结构加固法等,以提高人们对工程加固方法的认识,确保工程加固的合理性。     

校舍抗震加固工程的设计及施工要点

校舍抗震加固工程具有工期紧、专业性强、工程复杂性、加固材料质量参差不齐等特点,根据部分工程监督实践经验,以某学校加固工程为例,介绍了相应的抗震加固设计方案及施工控制要点,可供类似工程抗震加固设计和施工参考。     

楼面增荷改造加固设计与施工技术

针对某楼面增荷改造加固工程,介绍了该工程的改造加固方案,并在此基础上探讨了结构加固施工工艺。工程实践证明该方法加固效果良好,可为类似结构加固提供借鉴。     

浅谈混凝土结构加固技术

混凝土加固在实际工程中越来越普遍,本文汇总各种不同的混凝土加固方法的前期工作、基本原则及优缺点,解决工程中遇到的大部分需要加固的情况,并结合实际工程进行几种加固方法综合加固。     

谈混凝土结构抗震加固方案

结合抗震加固工程实践,对抗震加固工程领域存在的主要问题进行了阐述,探讨了抗震加固工程的设计原则、常用加固方案及选择要点,并以教学楼抗震加固工程为例进行介绍,为相关工程提供参考。     

初探建筑结构加固工程质量管理特点

从结构可靠度鉴定管理、加固工程质量管理、加固工程监督管理等方面入手,重点论述了结构加固工程的质量管理特点,借以抛砖引玉,共同提高结构加固工程质量管理水平,促进结构加固工程事业的健康发展。     

碳纤维加固混凝土技术性能评价

本文通过对加固改造工程中最新应用———碳纤维加固混凝土技术性能的定性评价 ,提出碳纤维加固混凝土工程功能评价的量化模型 ,以利于碳纤维加固技术在工程中的应用和推广。     

某工程加固方案选择及技术措施

简要介绍了一个具体加固改造工程实例选用的几种钢筋混凝土构件加固方法：增大截面加固法、外粘型钢加固法、粘贴钢板加固法,同时为保证加固改造后结构与原结构协同工作的能力采取了个别部位的加固技术措施,具有一定的工程实践意义,可供同类工程参考。     

旧建筑物加固改造设计方法

针对日益增多的旧建筑加固改造工程,系统总结结构加固改造工程处理流程和设计方法,包括加固工程概念,流程,前期准备,设计方法,施工控制以及加固后的保护等内容,其中重点论述加固改造结构设计方法,为加固改造工程新领域提供一些借鉴和经验。     

文物建筑基础加固保护的若干技术进展

鉴于国内文物建筑保护的基础加固工程尚处于发展阶段、相关经验较少的现状,归纳总结了国外文物建筑保护的若干基础加固技术,结合成功应用的工程实例作了相应介绍,希望对国内文物建筑保护的基础加固工程有所参考和借鉴.介绍的技术包括:换填法、静压桩托换法、灌浆加固法以及有限元模拟分析法.以吴哥巴戎寺北图书馆的基础加固工程为例.介绍了基础材料的换填技术;以塔尔图大学主楼的基础加固工程为例,介绍了静压桩托换法在基础加固工程中的应用;以罗马圣玛丽教堂的开挖地下室工程为例,介绍了灌浆加固法在基础加固工程中的应用;以圣彼德堡证券交易所建筑物为例,介绍如何利用有限元模型确定裂缝产生原因.实际选用何种基础加固技术,应结合具体工程的建筑特点和结构特点,选出最优方案,并在施工过程中和完工后进行观察和监测.     

开孔板连接件相对滑移机理试验研究

为研究组合结构桥梁中开孔板连接件的相对滑移机理,以开孔板厚度、孔中钢筋直径、开孔板孔径为变化参数,进行了21个开孔板连接件抗剪性能模型试验。通过理论分析与试验结果比较,揭示了开孔板连接件相对滑移量主要由孔中钢筋剪切变形量、孔中混凝土压缩变形量和剪切变形量三部分组成,以及抗剪承载力对应相对滑移量随板厚增加而减小,随孔径、孔中钢筋直径增加而增大的滑移机理。     

Development of a shrouded wind turbine with a flanged diffuser

We have developed a wind turbine system that consists of a diffuser shroud with a broad-ring flange at the exit periphery and a wind turbine inside it. The flanged-diffuser shroud plays a role of a device for collecting and accelerating the approaching wind. Emphasis is placed on positioning the flange at the exit of a diffuser shroud. Namely, the flange generates a low-pressure region in the exit neighborhood of the diffuser by vortex formation and draws more mass flow to the wind turbine inside the diffuser shroud. To obtain a higher power output of the shrouded wind turbine, we have examined the optimal form of the flanged diffuser, such as the diffuser open angle, flange height, hub ratio, centerbody length, inlet shroud shape and so on. As a result, a shrouded wind turbine equipped with a flanged diffuser has been developed, and demonstrated power augmentation for a given turbine diameter and wind speed by a factor of about 4-5 compared to a standard (bare) wind turbine. In a field experiment using a prototype wind turbine with a flanged diffuser shroud, the output performance was as expected and equalled that of the wind tunnel experiment.     

Time to build options in construction processes

Time to build is a very important factor in a real estate development venture. Delay in completion of a project not only affects the financing costs and the rental revenue but also it may, on a more strategic note, determine the success or failure of a project. A time to build option model consisting of a stochastic rate of completion and a stochastic net project payoff is applied to the sequential construction process of a large scale construction project. The results of the sensitivity analysis show that the optimal payoff value, that triggers the exercise of the option to invest at a maximum rate, increases positively with the increases in cash flow volatility, input cost uncertainty, excess asset return per unit risk and maximum rate of investment. However, it has a negative relationship with the rental yield. In a case study involving a commercial project, the premium for hedging the payoff risks by pre-leasing a project was estimated at 11.29%, whereas the additional cost incurred for shielding a project against input cost risks in a design and build contract was estimated at 7.80%, where each is given as a percentage of the total construction costs.     

横向流动土体作用下的群桩反应性状

借助FLAC3D程序,分析了基坑开挖后土体横向流动作用下坑内群桩的反应性状。研究了两桩、四桩、五桩、六桩群桩中基桩的反应性状,并与相同位置的单桩反应进行了比较,得到了受横向流动土体作用的群桩相互作用规律:桩基连线平行于边坡布置的两桩,相互影响并不明显;而在其它情况下,前排桩对后排桩遮拦、后排桩对前排桩阻挡,均使受影响的桩基内力分布改变,桩身最大变形量减小;受周围越多、越近桩基的影响,基桩的内力和变位减少得越多。根据桩间土体的成拱特征,定性解释了群桩相互作用的机理与规律,具体工程的现场量测结果也验证了此结论。     

J型烟囱的设计

为满足燃油锅炉的烟气排放要求，设计了Ｊ型烟囱，它由斜三通，直管，膨胀节，防爆门，雨漏、落水管道组成；给出了烟囱高度计算公式，指出烟囱设计中应注意的几个问题。实际运行表明，这种烟囱烟气排放指标符合当地环保要求。     

Inside the Eco-home: Using Video to Understand the Implications of Innovative Housing

As a method of qualitative research, video offers a means of looking into the world of a respondent and a means of stimulating a dialogue, both with the respondent and others. Video requires, however, the application of additional ethical procedures and may also increase refusal rates, if it is publicly disseminated. Applied to the home, the use of video reveals both practice and identity. Video records practice, showing how the spaces within a home are used at a particular time. For this reason, video is well adapted to understanding the implications of living in a home with an innovative design and technology, with all the complexities that this commonly involves. Equally, video communicates the appearance of the home and of its occupants to whoever is watching. Video is, therefore, intimately connected to identity and the home as a place.     

Life-cycle social analysis of motorway bridges

User costs of a bridge are the costs incurred by the users of the bridge, which result from any construction and/or maintenance activity being performed in the bridge. Typically, these costs encompass the additional time lost due to incurred congestion, the additional costs of vehicle operation and the costs of additional accidents. Usually, such costs are not considered in the procedures leading to the formulation of strategies for bridge construction, maintenance and repair, despite their relevance in comparison with the costs incurred by the agency or owner of the bridge. Moreover, in a life-cycle perspective of a bridge, with a time span over 100 years, the quantification of user costs is affected by a large number of uncertainties. Therefore, it is the purpose of this paper to introduce a life-cycle analysis for the quantification of typical user costs, in a probabilistic approach. For this purpose, the analysis of a motorway bridge in Portugal is performed. The results of the case study demonstrate that user costs can be much more important than costs supported by the concessionaire, in a life-cycle perspective, and thus, a much higher importance should be given to these costs apart from the scientific community.     

Energy landscape: Los Angeles Harbor and the establishment of oil-based capitalism in Southern California, 1871–1930

In the first three decades of the twentieth century, the Los Angeles metropolitan area emerged as the fastest growing urban–industrial economy on the Pacific Coast. This was a significant achievement for a city without a natural harbour. Despite formidable barriers presented by physical geography, the gradual development of a deep-water harbour in Los Angeles was fundamental to the emergence of oil-based capitalism in Southern California. In the first three decades of the twentieth century, under the municipal governance of a Board of Harbor Commissioners, private oil companies developed Los Angeles Harbor into a modern transhipment facility comprising infrastructures and technologies dedicated to the efficient transportation, storage, and refining of petroleum and petroleum-based products. From this perspective, Los Angeles Harbor needs to be understood as a long-term, fixed-capital investment into oil-based energy as fuel for industry and transportation. As a transhipment facility, Los Angeles Harbor also functioned as a critical outlet for surplus energy after the discovery of several large fields in the Los Angeles Basin in the early 1920s. By focusing on a particular built landscape, this paper aims to contribute insight into how geographies of fixed-capital investment play a role in the regional dynamics of energy transition and establishment.     

Nonlinear analysis and reliability of metallic truss structures

The present study goes into the search for the safety domain of civil engineering structures. The objective is to show how a reliability-evaluation brought by a mechanical sizing can be obtained. For that purpose, it is necessary to have a mechanical model and a reliability model representing correctly the behavior of this type of structure.It is a question on one hand, to propose a formulation for the nonlinear calculation (mechanical nonlinearity) of the spatial structures in trusses, and on the other hand, to propose or to adapt a formulation and a modeling of the reliability. The principle of Hasofer-Lind can be applied, in first approach, for the reliability index estimation, scenarios and the probability of failure.The made check concerned metallic in truss structures. Finally, some structures are calculated using the method adapted by Hasofer-Lind to validate the probability approach of the reliability analysis.     

Choctaw Eco-Industrial Park: an ecological approach to industrial land-use planning and design

This project investigates the concepts of industrial ecology and eco-industrial parks and applies those concepts to the redesign of an existing industrial park in Choctaw, OK. The opportunity for developing an eco-industrial park on this site comes from the availability of waste water for non-potable water needs, and the abundance of waste tires as raw materials for products to drive a new set of industrial partnerships. These industrial partnerships include the City of Choctaw Waste Water Treatment Plant, a tire shredding company, a tire pyrolysis company, a hydroponics industry, a hard rubber tire manufacturer, a screen printer, a plastics manufacturer, a toner manufacturer, and a toner cartridge manufacturer. The nature of this relationship and the design of the eco-industrial park is contained within this report. The result of this investigation is a new, common sense, approach to industrial land use that combines economic growth and environmental protection.