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土木工程中英文翻译样本

土木工程中英文翻译样本
土木工程中英文翻译样本

Structural Systems to resist lateral loads

Commonly Used structural Systems

With loads measured in tens of thousands kips,there is little room in the design of high-rise buildings for excessively complex thoughts. Indeed,the better high-rise buildings carry the universal traits of simplicity of thought and clarity of expression.

It does not follow that there is no room for grand thoughts. Indeed,it is with such grand thoughts that the new family of high-rise buildings has evolved. Perhaps more important,the new concepts of but a few years ago have become commonplace in today’ s technology.

Omitting some concepts that are related strictly to the materials of construction,the most commonly used structural systems used in high-rise buildings can be categorized as follows:

1.Moment-resisting frames.

2.Braced frames,including eccentrically braced frames.

3.Shear walls,including steel plate shear walls.

4.Tube-in-tube structures.

5.Tube-in-tube structures.

6.Core-interactive structures.

7.Cellular or bundled-tube systems.

Particularly with the recent trend toward more complex forms,but in response also to the need for increased stiffness to resist the forces from wind and earthquake,most high-rise buildings have structural systems built up of combinations of frames,braced bents,shear walls,and related systems. Further,for the taller buildings,the majorities are composed of interactive elements in three-dimensional arrays.

The method of combining these elements is the very essence of the design process for high-rise buildings. These combinations need evolve in response to environmental,functional,and cost considerations so as to provide efficient structures that provoke the architectural development

to new heights. This is not to say that imaginative structural design can create great architecture. To the contrary,many examples of fine architecture have been created with only moderate support from the structural engineer,while only fine structure,not great architecture,can be developed without the genius and the leadership of a talented architect. In any event,the best of both is needed to formulate a truly extraordinary design of a high-rise building.

While comprehensive discussions of these seven systems are generally available in the literature,further discussion is warranted here .The essence of the design process is distributed throughout the discussion.

Moment-Resisting Frames

Perhaps the most commonly used system in low-to medium-rise buildings,the moment-resisting frame,is characterized by linear horizontal and vertical members connected essentially rigidly at their joints. Such frames are used as a stand-alone system or in combination with other systems so as to provide the needed resistance to horizontal loads. In the taller of high-rise buildings,the system is likely to be found inappropriate for a stand-alone system,this because of the difficulty in mobilizing sufficient stiffness under lateral forces.

Analysis can be accomplished by STRESS,STRUDL,or a host of other appropriate computer programs;analysis by the so-called portal method of the cantilever method has no place in today’s technology.

Because of the intrinsic flexibility of the column/girder intersection,and because preliminary designs should aim to highlight weaknesses of systems,it is not unusual to use center-to-center dimensions for the frame in the preliminary analysis. Of course,in the latter phases of design,a realistic appraisal in-joint deformation is essential.

Braced Frame s

The braced frame,intrinsically stiffer than the moment –resisting frame,finds also greater

application to higher-rise buildings. The system is characterized by linear horizontal,vertical,and diagonal members,connected simply or rigidly at their joints. It is used commonly in conjunction with other systems for taller buildings and as a stand-alone system in low-to medium-rise buildings.

While the use of structural steel in braced frames is common,concrete frames are more likely to be of the larger-scale variety.

Of special interest in areas of high seismicity is the use of the eccentric braced frame.

Again,analysis can be by STRESS,STRUDL,or any one of a series of two –or three dimensional analysis computer programs. And again,center-to-center dimensions are used commonly in the preliminary analysis.

Shear walls

The shear wall is yet another step forward along a progression of ever-stiffer structural systems. The system is characterized by relatively thin,generally (but not always) concrete elements that provide both structural strength and separation between building functions.

In high-rise buildings,shear wall systems tend to have a relatively high aspect ratio,that is,their height tends to be large compared to their width. Lacking tension in the foundation system,any structural element is limited in its ability to resist overturning moment by the width of the system and by the gravity load supported by the element. Limited to a narrow overturning,One obvious use of the system,which does have the needed width,is in the exterior walls of building,where the requirement for windows is kept small.

Structural steel shear walls,generally stiffened against buckling by a concrete overlay,have found application where shear loads are high. The system,intrinsically more economical than steel bracing,is particularly effective in carrying shear loads down through the taller floors in the areas immediately above grade. The sys tem has the further advantage of having high ductility a feature of particular importance in areas of high seismicity.

The analysis of shear wall systems is made complex because of the inevitable presence of large openings through these walls. Preliminary analysis can be by truss-analogy,by the finite element method,or by making use of a proprietary computer program designed to consider the interaction,or coupling,of shear walls.

Framed or Braced Tubes

The concept of the framed or braced or braced tube erupted into the technology with the IBM Building in Pittsburgh,but was followed immediately with the twin 110-story towers of the World Trade Center,New York and a number of other buildings .The system is characterized by three –dimensional frames,braced frames,or shear walls,forming a closed surface more or less cylindrical in nature,but of nearly any plan configuration. Because those columns that resist lateral forces are placed as far as possible from the cancroids of the system,the overall moment of inertia is increased and stiffness is very high.

The analysis of tubular structures is done using three-dimensional concepts,or by two- dimensional analogy,where possible,whichever method is used,it must be capable of accounting for the effects of shear lag.

The presence of shear lag,detected first in aircraft structures,is a serious limitation in the stiffness of framed tubes. The concept has limited recent applications of framed tubes to the shear of 60 stories. Designers have developed various techniques for reducing the effects of shear lag,most noticeably the use of belt trusses. This system finds application in buildings perhaps 40stories and higher. However,except for possible aesthetic considerations,belt trusses interfere with nearly every building function associated with the outside wall;the trusses are placed often at mechanical floors,mush to the disapproval of the designers of the mechanical systems. Nevertheless,as a cost-effective structural system,the belt truss works well and will likely find continued approval from designers. Numerous studies have sought to optimize the location of

these trusses,with the optimum location very dependent on the number of trusses provided. Experience would indicate,however,that the location of these trusses is provided by the optimization of mechanical systems and by aesthetic considerations,as the economics of the structural system is not highly sensitive to belt truss location.

Tube-in-Tube Structures

The tubular framing system mobilizes every column in the exterior wall in resisting over-turning and shearing forces. The term‘tube-in-tube’is largely self-explanatory in that a second ring of columns,the ring surrounding the central service core of the building,is used as an inner framed or braced tube. The purpose of the second tube is to increase resistance to over turning and to increase lateral stiffness. The tubes need not be of the same character;that is,one tube could be framed,while the other could be braced.

In considering this system,is important to understand clearly the difference between the shear and the flexural components of deflection,the terms being taken from beam analogy. In a framed tube,the shear component of deflection is associated with the bending deformation of columns and girders (i.e,the webs of the framed tube) while the flexural component is associated with the axial shortening and lengthening of columns (i.e,the flanges of the framed tube). In a braced tube,the shear component of deflection is associated with the axial deformation of diagonals while the flexural component of deflection is associated with the axial shortening and lengthening of columns.

Following beam analogy,if plane surfaces remain plane (i.e,the floor slabs),then axial stresses in the columns of the outer tube,being farther form the neutral axis,will be substantially larger than the axial stresses in the inner tube. However,in the tube-in-tube design,when optimized,the axial stresses in the inner ring of columns may be as high,or even higher,than the axial stresses in the outer ring. This seeming anomaly is associated with differences in the shearing component of stiffness between the two systems. This is easiest to under-stand where the

土木工程外文翻译.doc

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a common way to construct steel truss and prestressed concrete cantilever spans is to counterbalance each cantilever arm with another cantilever arm projecting the opposite direction,forming a balanced cantilever. they attach to a solid foundation ,the counterbalancing arms are called anchor arms /thus,in a bridge built on two foundation piers,there are four cantilever arms ,two which span the obstacle,and two anchor arms which extend away from the obstacle,because of the need for more strength at the balanced cantilever's supports ,the bridge superstructure often takes the form of towers above the foundation piers .the commodore barry bridge is an example of this type of cantilever bridge 一种常见的方法构造钢桁架和预应力混凝土悬臂跨度是每一个悬臂抗衡预测相反的方向臂悬臂,形成一个平衡的悬臂。他们重视了坚实的基础,制约武器被称为锚武器/因此,在两个基础上建一座桥桥墩,有四个悬臂式武器,这两者之间跨越的障碍,和两个锚武器哪个延长距离的障碍,因为为更多的在平衡悬臂的支持力量的需要,桥梁上部结构往往表现为塔墩基础之上形成的准将巴里大桥是这种类型的例子悬臂桥 steel truss cantilever support loads by tension of the upper members and compression of the lower ones .commonly ,the structure distributes teh tension via teh anchor arms to the outermost supports ,while the compression is carried to the foundation beneath teh central towers .many truss cantilever bridges use pinned joints and are therefore statically determinate with no members carrying mixed loads 钢桁架悬臂由上层成员和下层的紧张压缩支持负载。通常,结构分布通过锚武器的最外层的支持紧张,而压缩抬到下方的中央塔的基础。桁架悬臂许多桥梁使用固定的关节,是静定,没有携带混合负载的成员,因此 prestressed concrete balanced cantilever bridges are often built using segmental construction .some steel arch bridges are built using pure cantilever spans from each sides,with neither falsework below nor temporary supporting towers and cables above ,these are then joined with a pin,usually after forcing the union point apart ,and when jacks are removed and the bridge decking is added the bridge becomes a truss arch bridge .such unsupported construction is only possible where appropriate rock is available to support the tension in teh upper chord of the span during construction ,usually limiting this method to the spanning of narrow canyons 预应力混凝土平衡悬臂桥梁往往建立使用段施工。一些钢拱桥是使用各方面的纯悬臂跨度既无假工作下面也临时支撑塔和电缆上面,这些都是再加入了一根针,通常在迫使工会点外,当插孔删除,并添加桥梁甲板桥成为桁架拱桥,这种不支持的建设,才可能在适当情况下的岩石可用于支持在施工期间的跨度弦上的张力,通常限制这狭隘的峡谷跨越方法 an arch bridge is a bridge with abutments at each end shaped as a curved arch .arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side .a viaduct may be made from a series of arches ,although other more economical structures are typically used today 在拱桥桥台的桥梁,是一个在一个弧形拱状,每年年底。拱桥通过转移到由部分在两边的桥台水平推

土木工程外文文献翻译

专业资料 学院: 专业:土木工程 姓名: 学号: 外文出处:Structural Systems to resist (用外文写) Lateral loads 附件:1.外文资料翻译译文;2.外文原文。

附件1:外文资料翻译译文 抗侧向荷载的结构体系 常用的结构体系 若已测出荷载量达数千万磅重,那么在高层建筑设计中就没有多少可以进行极其复杂的构思余地了。确实,较好的高层建筑普遍具有构思简单、表现明晰的特点。 这并不是说没有进行宏观构思的余地。实际上,正是因为有了这种宏观的构思,新奇的高层建筑体系才得以发展,可能更重要的是:几年以前才出现的一些新概念在今天的技术中已经变得平常了。 如果忽略一些与建筑材料密切相关的概念不谈,高层建筑里最为常用的结构体系便可分为如下几类: 1.抗弯矩框架。 2.支撑框架,包括偏心支撑框架。 3.剪力墙,包括钢板剪力墙。 4.筒中框架。 5.筒中筒结构。 6.核心交互结构。 7. 框格体系或束筒体系。 特别是由于最近趋向于更复杂的建筑形式,同时也需要增加刚度以抵抗几力和地震力,大多数高层建筑都具有由框架、支撑构架、剪力墙和相关体系相结合而构成的体系。而且,就较高的建筑物而言,大多数都是由交互式构件组成三维陈列。 将这些构件结合起来的方法正是高层建筑设计方法的本质。其结合方式需要在考虑环境、功能和费用后再发展,以便提供促使建筑发展达到新高度的有效结构。这并

不是说富于想象力的结构设计就能够创造出伟大建筑。正相反,有许多例优美的建筑仅得到结构工程师适当的支持就被创造出来了,然而,如果没有天赋甚厚的建筑师的创造力的指导,那么,得以发展的就只能是好的结构,并非是伟大的建筑。无论如何,要想创造出高层建筑真正非凡的设计,两者都需要最好的。 虽然在文献中通常可以见到有关这七种体系的全面性讨论,但是在这里还值得进一步讨论。设计方法的本质贯穿于整个讨论。设计方法的本质贯穿于整个讨论中。 抗弯矩框架 抗弯矩框架也许是低,中高度的建筑中常用的体系,它具有线性水平构件和垂直构件在接头处基本刚接之特点。这种框架用作独立的体系,或者和其他体系结合起来使用,以便提供所需要水平荷载抵抗力。对于较高的高层建筑,可能会发现该本系不宜作为独立体系,这是因为在侧向力的作用下难以调动足够的刚度。 我们可以利用STRESS,STRUDL 或者其他大量合适的计算机程序进行结构分析。所谓的门架法分析或悬臂法分析在当今的技术中无一席之地,由于柱梁节点固有柔性,并且由于初步设计应该力求突出体系的弱点,所以在初析中使用框架的中心距尺寸设计是司空惯的。当然,在设计的后期阶段,实际地评价结点的变形很有必要。 支撑框架 支撑框架实际上刚度比抗弯矩框架强,在高层建筑中也得到更广泛的应用。这种体系以其结点处铰接或则接的线性水平构件、垂直构件和斜撑构件而具特色,它通常与其他体系共同用于较高的建筑,并且作为一种独立的体系用在低、中高度的建筑中。

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