异型柱施工技术在高层建筑施工中的应用研究

本文主要概述了异型柱的施工原理、异型柱的施工工艺流程,并以某工程为例,对该工程的施工准备阶段、异型柱的钢筋绑扎施工、异型柱的模板加工及其质量控制以及异型柱的混凝土浇筑进行分析和探讨。     

论述抗震设计中斜支撑结构的作用

单个结构单元的非线性分析说明,在异型柱框架中添加了人字形支撑后,结构的抗扭刚度和抗扭承载力有显著提高,延性也有所提高。通过对异型柱框架结构和矩形柱结构进行地震作用下的对比分析,说明异型柱框架的抗扭性能要远低于等惯性矩的矩形框架结构,添加斜支撑对提高异型柱框架抗震性能有显著作用。本文采用有限元程序Ansys和SAP,对异型柱框架结构和异型柱加斜支撑结构进行了空间受力分析,并建议在刚心与质心不一致的异型柱框架结构中,适当使用斜支撑结构以便提高结构抗扭性能。     

利用斜支撑提高异型柱框架结构抗扭性能的研究

采用有限元程序ANSYS和SAP ,对异型柱框架结构和异型柱加斜支撑结构进行了空间受力分析。单个结构单元的非线性分析说明 ,在异型柱框架中添加了人字形支撑后 ,结构的抗扭刚度和抗扭承载力有显著提高 ,延性也有所提高。通过对异型柱框架结构和矩形柱结构进行地震作用下的对比分析 ,说明异型柱框架的抗扭性能要远低于等惯性矩的矩形框架结构 ,而添加斜支撑对提高异型柱框架抗震性能有显著作用。并建议在刚心与质心不一致的异型柱框架结构中 ,应适当使用斜支撑结构以提高结构抗扭性能     

高性能混凝土异型柱边框架抗震性能试验研究

本文在两榀不等跨异型柱边框架中,采用了掺加粉煤灰的大流动性高性能混凝土,并以变化异型柱柱肢宽厚比的方式获得不同的抗侧刚度。在低周反复荷载试验研究与对比分析基础上,得出了不同水平抗侧刚度的高性能混凝土异型柱边框架结构的水平承载能力、变形与耗能等抗震性能。研究表明:大流动性外掺粉煤灰的高性能混凝土异型柱边框架属于典型的“强柱弱梁”式结构,随着异型柱柱肢宽厚比的增加,异型柱框架结构水平抗侧刚度提高,高性能混凝土异型柱边框架的抗震性能明显改善,特别体现在屈服荷载点之后,框架结构的耗能能力有显著提高。本文的研究可供异型柱结构的抗震设计和高性能混凝土的推广作参考。     

对斜支撑结构于抗震设计中作用的探讨

单个结构单元的非线性分析说明，在异型柱框架中添加了人字形支撑后，结构的抗扭刚度和抗扭承载力有显著提高，延性也有所提高。通过对异型柱框架结构和矩形柱结构进行地震作用下的对比分析，说明异型柱框架的抗扭性能要远低于等惯性矩的矩形框架结构，添加斜支撑对提高异型柱框架抗震性能有显著作用。本文采用有限元程序Ansys和SAP，对异型柱框架结构和异型柱加斜支撑结构进行了空间受力分析，并建议在刚心与质心不一致的异型柱框架结构中，适当使用斜支撑结构以便提高结构抗扭性能。     

异型柱在建筑工程中的施工技术探讨

混凝土异型柱结构是以异型截面柱代替一般框架柱作为竖向支承构件的结构。混凝土异型柱在建筑结构中的应用具有很好的灵活性和方便性,能够给整体功能带来较大的变化。本文笔者将结合具体的建筑工程施工实例,简要探讨异型柱的具体施工过程,希望能对类似工程起到借鉴作用。     

住宅工程的结构设计

名词解释异型柱:除了矩形和圆形柱子外的各种截面形状柱子全部称为异型柱,在异型柱与现浇混凝土空心楼盖结构体系住宅工程上使用如下的几种异型柱,截面形状有十字柱、角柱、丁字柱、扁柱之分。现浇混凝土空心楼盖:在现浇混凝土空心楼盖的内部,上下钢筋之间设置截面形状有圆形、     

异型柱结构内力分析研究

异型柱结构由于柱截面几何形状和平面布置的特殊性，内力分布与变形同矩形柱结构有较大的差别。本文针对异型柱结构的特点，建议了柱单元模型、计算简图及合理计算参数的选取，并对一异型柱工程按不同的计算模型进行了内力分析对比。最后将几个常用设计软件在异型柱结构内力分析和设计方面的功能列表比较，以供工程设计人员选用时参考。     

异型柱框-桁架结构的抗震性能研究

在试验与理论研究的基础上 ,对 2 4栋异型柱框 桁架结构与异型柱框架结构抗震性能进行了对比研究 ,讨论了不同框 桁架选型对异型柱框 桁架刚度及地震反应的影响 ,提出了可供工程设计参考的建议     

浅谈异型柱框架结构设计

从异型柱框架结构的自身受力特点出发,结合实践经验,从结构平面布置、设计方法、构造设计等方面探讨了异型柱在住宅结构设计中应注意的相关问题,指出异型柱框架结构可以较好地满足建筑功能要求,具有良好的发展前景,值得推广。     

Zustandsuntersuchung und Instandsetzung am Hauptdach des Hauses der Kulturen der Welt in Berlin

The main roof of the ”Haus der Kulturen der Welt“ in Berlin Which is very well‐known on account of its history and striking structural design – was to be inspected by the author to determine its condition and analysed with regard to the durability of the existing liquid synthetic sealant. The roof structure consists of a biaxial, curved area‐covering structural element with circumferential edge beams of pre‐stressed lightweight concrete. This is the result of the reconstruction between 1984 and 1987 following a partial collapse of the then Berlin Congress Hall in 1980. The very thin roof shell is also made of lightweight concrete and, like the edge beams, has a polyurethane‐based spray‐on seal that was specially developed for this purpose as protection against the ingress of moisture. The reason why this, at the time, novel type of seal was chosen was that it should take into account the fact that the roof design urgently needed some kind of protection against moisture that had to compensate the expected changes shape and crack movements of the roof with no damage. The following article reports on the nature, scope and main results of the analysis of the condition of the roof seal, edge beams and abutments. It will also describe the repair recommendations resulting from the investigations, which form the basis of the execution of work at the present point in time. Apart from presenting the technical principles and special features of the building that have to be taken into account during any repairs, the special features of the execution will also be addressed.     

Magnetoelastische Spannkraftmessung in Bauwerken

Magnetoelastic Measurement of Prestressing Force in Civil Structures The knowledge of the tensile force of prestressing steel elements and its reliable and non‐destructive determination are of essential importance for the assessment of the structural health condition of prestressed concrete structures and tie‐back systems in terms of structural safety, serviceability and durability. For the evaluation of the prestressing force in steel tension members, the measurement technique presented in this contribution is using the magneto‐elastic effect (ME‐effect) of ferromagnetic materials. This effect describes the reverse‐proportional correlation between the mechanical stress and the magnetic properties of ferromagnetic materials. The cylindrical coiled sensors pushed over the tendon and the measuring device developed and practically optimized at the iBMB/MPA of the TU Braunschweig enable a fast and reliable measurement of the prestressing steel force after an initial calibration. In this contribution first the state of the art of prestress measurement techniques for steel tension members is presented. Afterwards, the ME‐measuring method with the basics and merits of magneto‐elastic prestressing force identification is shown. Further recent research results as well as several building applications will be discussed.     

谈贯标中企业如何做好检验和试验工作

根据在贯彻GB／T 19001－ISO9000族标准过程中的实际工作经验,从贯彻中为什么要抓好检验和试验工作入手,对检验和试验依据的管理,检验和试验设计的控制,检验和试验人员的培训,检验和试验记录的填写,保存和分析四个方面进行了论述,阐述了检验和试验工作在贯标中的重要性。     

Colour and turbidity removal with reusable magnetite particles—VII: A colloid chemistry study of the effect of inorganic ions on the efficiency of clarification

The removal of colour and turbidity from natural waters by the addition of magnetite is an interfacial process. Furthermore the components of this system are either of colloidal dimensions or of a surface active nature and thus this method of water clarification is very much in the realm of surface and colloid chemistry. Electrokinetic techniques have been used to examine the influence of a number of inorganic species, commonly encountered in the practical situation, on the surface properties of magnetite and consequently on the efficiency of the process.     

Alternative Methods of Procurement for Works of Water and Environmental Management

The paper considers methods of procurement for the construction of water- and sewage-treatment works other than the traditional use of the ICE 5th Edition Conditions of Contract and Bills of Quantities. This is as a consequence of the speed at which schemes are currently required within the water industry.
The paper particularly focuses on the use of target contracts, using the Institution of Chemical Engineers'Green Book form, and considers various types of target. It also discusses the form which tender documents may take, and how targets may be calculated.
Tendering procedures, including the use of two-stage tenders and negotiated targets, are considered, as are the procedures for cost monitoring and the financial management of the contract. Finally, the role of the engineer and quantity surveyor is considered.     

斜坡失稳的突变模型与混沌机制

针对斜坡平在滑动失稳问题,运用突变理论方法,给出了快速滑坡和慢还滑坡发生的判据,提出了刚度效应失稳新理论,指出刚体极限平衡稳定性评价方法有较大缺陷;根据建立的斜坡演非线性动力学模型,发现外部环境因素的作用一斜坡系统的响应有复杂的非线性关系,当斜坡本身的非线性作用与外部环境因素的作用能力相当时,斜坡化过程会出现混沌现象,其通向混沌之路是通过倍周期分叉实现的。     

Erfahrungen bei der Beurteilung der Dauerhaftigkeit vorgespannter Bewehrung von älteren Spannbetonbrücken

Experiences due to the evaluation of the durability of prestressed reinforcements in old prestressed concrete bridges. Old prestressed concrete bridge superstructures exhibiting cracks across the prestressed reinforcement need detailed inspections for estimating maintenance requirements. Only this type of evaluation makes it possible to determine the required extent and nature of maintenance. In this paper essential steps of the “Directive of the durability of prestressed reinforcements in old prestressed concrete bridge superstructures” of the Federal Highway Research Institute are explained, also against the effects of growing heavy traffic with expected higher gross weights and axle loads.     

景框的中介——电影与建筑中的动态布局

本文探讨了作为电影和建筑中的一个主要空间构成主题——景框理念。对空间的电影几何关系和建构几何关系的设置.体块、空间、视角、景观、相机和演员的相对位置和组织等.会产生特殊的张力、关系和动态——所有这一切都指向景框所带来的触媒作用和示能作用。电影与建筑中的空间是许多潜在的力量和相互作用的动力场,它涉及对空间景框、机制和策略的部署与调控,由此实现构成的、语义的和叙事的目的。景框建立了边界,但也促进并提醒可能会遇到的那些模棱两可、针锋相对与制约的突破.以及一种呈现怪诞特征的潜力。     

A Survey of Ferruginous Minewater Impacts in the Welsh Coalfields

The aim of this study was to locate all ferruginous discharges within the Welsh coalfield areas and to assess their impact upon receiving watercourses. The project was undertaken in two stages. In the first stage, visual assessments were carried out on an area of river bed affected by iron hydroxide deposition. Chemical samples of the discharges and the receiving watercourse were analysed for a suite of physico-chemical determinands. Ninety discharges were located impacting upon 59.4 km of river, and an area of 22 ha was affected by iron hydroxide deposits.
A ranking method, incorporating the physical/chemical determinands, was developed to assess the comparative impact which discharges were having on receiving watercourses. A total of 33 of the top ranked discharges- (20 to classified watercourses and 13 to unclassified watercourses) having the highest environmental impact were selected; chemical, biological and fisheries impact assessments were then carried out on these discharges in the second stage of the project. The sites were then ranked on the basis of biological and fisheries impact. A list of the highest impacted sites was produced, and some of these were further investigated for remediation options and associated costs.