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交通建设项目工程专业外文翻译外文文献英文文献.doc

交通建设项目工程专业外文翻译外文文献英文文献.doc
交通建设项目工程专业外文翻译外文文献英文文献.doc

土木工程学院交通工程专业

中英文翻译

Road Design

专业:交通工程

英文原文

The Basics of a Good Road

We have known how to build good roads for a long time. Archaeologists have found ancient Egyptian roadsthat carried blocks to the pyramids in 4600 BCE. Later,the Romans built an extensive road system, using the same principles we use today. Some of these roads are still in service.

If you follow the basic concepts of road building, you will create a road that will last. The ten commandments of a good road are:

(1)Get water away from the road

(2)Build on a firm foundation

(3)Use the best materials

(4)Compact all layers properly

(5)Design for traffic loads and volumes

(6)Design for maintenance

(7)Pave only when ready

(8)Build from the bottom up

(9)Protect your investment

(10)Keep good records

1.Get water away from the road

We can’t overemphasize the importance of good drainage.Engineers estimate that at least 90% of a road’s problems can be related to excess water or to poor waterdrainage. Too much water in any laye r of a road’sstructure can weaken that layer, leading to failure.

In the surface layer, water can cause cracks and potholes. In lower layers it undermines support, causing cracks and potholes. A common sign of water in an asphalt road surface is alligator cracking — an interconnected pattern of cracks forming small irregular shaped pieces that look like alligator skin. Edge cracking, frost heaves, and spring breakup of pavements also point to moisture problems.

To prevent these problems remember that water:

? flows downhill

? needs to flow someplace

? is a problem if it is not flowing

Effective drainage systems divert, drain and dispose of water. To do this they use interceptor ditches and slopes,road crowns, and ditch and culvert systems.

Divert —Interceptor ditches, located between the road and higher ground along the road, keep the water from reaching the roadway. These ditches must slope so they carry water away from the road.

Drain —Creating a crown in the road so it is higher along the centerline than at the edges encourages water to flow off the road. Typically a paved crown should be 1?4" higher than the shoulder for each foot of width from the centerline to the edge. For gravel surfaces the crown should be 1?2" higher per foot of width. For this flow path to work, the road surface must be relatively

water tight. Road shoulders also must be sloped away from the road to continue carrying the flow away. Superelevations (banking) at the outside of curves will also help drain

the road surface.

Dispose —A ditch and culvert system carries water away from the road structure. Ditches should be at least one foot lower than the bottom of the gravel road layer that drains the roadway. They must be kept clean and must be sloped to move water into natural drainage. If water stays in the ditches it can seep back into the road structure and undermine its strength. Ditches should also be protected from erosion by planting grass, or installing rock and other erosion control measures. Erosion can damage shoulders and ditches, clog culverts, undermine roadbeds, and contaminate nearby streams and lakes. Evaluate your ditch and culvert system twice a year to ensure that it works. In the fall, clean out leaves and branches that can block flow. In spring, check for and remove silts from plowing and any dead plant material left from the fall.

2.Build on a firm foundation

A road is only as good as its foundation. A highway wears out from the top down but falls apart from the bottom. The road base must carry the entire structure and the traffic that uses it.

To make a firm foundation you may need to stabilize the roadbed with chemical stabilizers, large stone called breaker run, or geotextile fabric. When you run into conditions where you suspect that the native soil is unstable, work with an engineer to investigate the situation and design an appropriate solution.

3.Use the best materials

With all road materials you “pay now or pay later.” Inferior materials may require extensive maintenance throughout the road’s life. They may also force you to replace the road prematurely.

Crushed aggregate is the best material for the base course. The sharp angles of thecrushed material interlock when they are compacted. This supports the pavement and traffic by transmitting the load from particle to particle. By contrast, rounded particles act like ball

bearings, moving under loads.

Angular particles are more stable than rounded particles.

Asphalt and concrete pavement materials must be of the highest quality, designed for the conditions, obtained from established firms, and tested to ensure it meets specifications. 4.Compact all layers

In general, the more densely a material is compacted, the stronger it is. Compaction also shrinks or eliminates open spaces (voids) between particles. This means that less water can enter the structure. Water in soil can weaken the structure or lead to frost heaves. This is especially important for unsurfaced (gravel) roads. Use gravel which has a mix of sizes (well-graded aggregate) so smaller particles can fill the voids between larger ones. Good

compaction of asphalt pavement lengthens its life.

5.Design for traffic loads and volumes

Design for the highest anticipated load the road will carry. A road that has been designed only for cars will not stand up to trucks. One truck with 9 tons on a single rear axle does as much damage to a road as nearly 10,000 cars.

Rural roads may carry log trucks, milk trucks, fire department pumper trucks, or construction equipment. If you don’t know what specific loads the road will carry, a good rule of thumb is to design for the largest piece of highway maintenance equipment that will be used on the road.

A well-constructed and maintained asphalt road should last 20 years without major repairs or

reconstruction. In designing a road, use traffic counts that project numbers and sizes of vehicles 20 years into the future. These are only projections, at best, but they will allow you to plan for traffic loadings through a road’s life.

6.Design for maintenance

Without maintenance a road will rapidly deteriorate and fail. Design your roads so they can be easily maintained. This means:

? adequate ditches that can be cleaned regularly

? culverts that are marked for easy locating in the spring

? enough space for snow after it is plowed off the road

? proper cross slopes for safety, maintenance and to avoid snow drifts

? roadsi des that are planted or treated to prevent erosion

? roadsides that can be mowed safely

A rule of thumb for adequate road width is to make it wide enough for a snowplow to pass another vehicle without leaving the travelled way.

Mark culverts with a post so they can be located easily.

7.Pave only when ready

It is not necessary to pave all your roads immediately. There is nothing wrong with a well-built and wellmaintained gravel road if traffic loads and volume do not require a paved surface. Three hundred vehicles per day is the recommended minimum to justify paving.

Don’t assume that laying down asphalt will fix a gravel road that is failing. Before you pave, make sure you have an adequate crushed stone base that drains well and is properly compacted. The recommended minimum depth of crushed stone base is 10" depending on subgrade soils. A road paved only when it is ready will far outperform one that is constructed too quickly.

8.ê Build from the bottom up

This commandment may seem obvious, but it means that you shouldn’t top dress or resurface a road if the problem is in an underlying layer. Before you do any road improvement, locate the cause of any surface problems. Choose an improvement technique that will address the problem. This may mean recycling or removing all road materials down to the native soil and rebuilding everything. Doing any work that doesn’t solve the problem is a waste of money and effort.

9.ê Protect your investment

The road system can be your municipality’s biggest investment. Just as a home needs painting or a new roof, a road must be maintained. Wisconsin’s severe climate requires more road maintenance than in milder places. Do these important maintenance activities: Surface —grade, shape, patch, seal cracks, control dust, remove snow and ice

Drainage —clean and repair ditches and culverts; remove all excess material

Roadside —cut brush, trim trees and roadside plantings, control erosion

Traffic service —clean and repair or replace signs

Design roads with adequate ditches so they can be maintained with a motor grader. Clean and grade ditches to maintain proper pitch and peak efficiency. After grading, remove all excess material from the shoulder.

10.Keep good records

Your maintenance will be more efficient with good records. Knowing the road’s construction, life, and repair history makes it much easier to plan and budget its future repairs. Records can also help you evaluate the effectiveness of the repair methods and materials you used.

Good record keeping starts with an inventory of the system. It should include the history and surface condition of the roadway, identify and evaluate culverts and bridges, note ditch conditions, shoulders, signs, and such structures as retaining walls and guardrails.

Update your inventory each year or when you repair or change a road section. A formal pavement management system can help use these records and plan and budget road improvements.

Resources

The Basics of a Good Road#17649, UW-Madison, 15 min. videotape. Presents the Ten Commandments of a Good Road. Videotapes are loaned free through County Extension offices.

Asphalt PASER Manual(39 pp), Concrete PASER Manual (48 pp), Gravel PASER Manual (32 pp). These booklets contain extensive photos and descriptions of road surfaces

to help you understand types of distress conditions and their causes. A simple procedure for rating the condition helps you manage your pavements and plan repairs.

Roadware, a computer program which stores and reports pavement condition information. Developed by the Transportation Information Center and enhanced by the Wisconsin Department of Transportation, it uses the PASER rating system to provide five-year cost budgets and roadway repair/reconstruction priority lists.

Wisconsin Transportation Bulletin factsheets, available from the Transportation Information Center (T.I.C.).

Road Drainage, No. 4. Describes drainage for roadways, shoulders, ditches, and culverts.

Gravel Roads, No. 5. Discusses the characteristics of a gravel road and how to maintain one.

Using Salt and Sand for Winter Road Maintenance,No. 6. Basic information and practical tips on how to use de-icing chemicals and sand.

Culverts—Proper Use and Installation, No. 15. Selecting and sizing culverts, designing, installing and maintaining them.

Geotextiles in Road Construction/Maintenance and

Erosion Control, No. 16. Definitions and common applications of geotextiles on roadways and for erosion control.

T.I.C. workshops are offered at locations around the state.

Crossroads,an 8-page quarterly newsletter published by the T.I.C. carries helpful articles, workshop information, and resource lists. For more information on any of these materials, contact the T.I.C. at 800/442-4615.

中文译文

一个良好的公路的基础

长久以来我们已经掌握了如何铺设好一条道路的方法,考古学家发现在4600年古埃及使用建造金字塔的石块铺设道路,后来,罗马人使用同样的方法建立了一个庞大的道路系统,这种方法一直沿用到今天。其中的某些道路依然发挥着作用。

如果我们遵照到路的基本概念铺设,将会建设一条持久耐用的道路。以下是铺设好一条道路的十点要求:

(1) 尽量做好道路的排水

(2) 路基的基础一定要稳固

(3) 选用经济合理的铺设材料

(4) 铺设的层次要紧凑合理

(5) 设计好道路的最大车辆荷载

(6) 做好设计维护

(7) 准备工作做好才能铺设

(8) 铺设从下往上开始

(9) 预算好您的投资

(10)保持良好的记录

1.尽量做好道路的排水

我们在怎么强调排水的重要性也不为过,工程师估计,至少有90%的道路的问题可能与过量的道路积水或劣质的排水设施有关。过多的水积攒在道路的结构层内,这样会减弱结构层与基层的稳定性,从而导致路基的破坏。在道路的面层,水分可能引起路面开裂和裂缝内积水。在基层将引起基层的支撑能力下降导致基层的破坏,会出现裂缝和坑洞。积水的一个共同的标志是沥青路面开裂是龟裂的—裂缝彼此之间相互关联,形成不规则的小块看起来像鳄鱼皮。边缘的裂缝,热胀冷缩,春季路面解冻的问题。为了防止此类的问题持续:

(1)水顺边坡下流

(2)排到必要的地方

(3)如果水分不能排出就会引起问题。

有效的排水系统,水分的排出和处置。为此,他们利用拦截沟渠和斜坡,道路冠冕,沟

渠和涵洞系统。

转移--拦截沟渠,坐落在道路和路线较高的位置,从而使水能够远离道路。这些排水沟与边坡能够将水分及时排走。

排水--建立在路上一顶王冠,因此沿中心线高于在边缘鼓励水流过马路。通常,铺设冠应该是1 / 4每页宽度脚高于“每个中心线的宽度从山脚到边缘的肩膀。砾石表面的冠应该是1 / 2高”。为此流路的工作,路面必须相对水密。路肩还必须远离公路倾斜,继续承载着流走。Superelevations在曲线外(银行)也将有助于drainthe路面。

处理—水沟,涵洞系统进行水离路面结构。沟渠应至少有一个脚比的砾石层,道路排水巷道底低。他们必须保持清洁,必须倾斜迁入自然排水。如果在沟渠的水留它可以渗透回道路结构和削弱其力量。沟渠也应受到保护不受侵蚀,种植草,或安装岩石和其他水土保持措施。侵蚀可以破坏的肩膀和沟渠,堵塞涵洞,破坏路基,并污染附近的河流和湖泊。

评估你的沟渠和涵洞制度,每年两次,以确保它可以工作。到了秋天,树叶和树枝清理掉,可以阻止流动。在春天,检查并清除耕耘任何死去的植物材料,从秋天离开淤泥。

2.路基的基础一定要稳固

阿路也只有在良好的基础。一条公路穿从上而下,但瀑布从底部分开。道路基础必须进行整个结构和交通使用它。为了使一个坚实的基础,你可能需要用化学稳定剂,稳定路基,大石头叫断路器运行,或土工织物。当你遇到条件下您怀疑乡土是不稳定的,具有工程师,调查有关情况,并设计一个适当的解决办法的工作。

3.选用经济合理的铺设材料

所有道路材料的你“,现在或以后付工资。”劣质材料可能需要在整个公路的生命进行大规模维修。他们也可能迫使你以取代道路过早。人工砂石料是为基层的最佳材料。在粉碎物料互锁锐角时,他们都将被压缩。这支持通过传输负载从粒子与粒子之间的路面和交通。相比之下,像圆颗粒球轴承,在外力作用下的运动。

沥青混凝土路面材料必须是最高质量的公司从成立的条件下获得的,设计和测试,以确保其符合规格。

4.铺设的层次要紧凑合理

在一般情况下,更密集的物质被压缩,这是越强。缩小或消除压实也粒子间空地(空隙)。这意味着更少的水可以进入的结构。土壤中水的结构可以削弱或导致霜冻眼帘。这对于unsurfaced(砾石)道路重要。使用砾石其中有一个尺寸(良好级配碎石)的组合,以便更小的颗粒可以填补较大的空隙之间。好

沥青路面压实延长其寿命。

5.设计好道路的最大车辆荷载

设计最高负荷预计将进行的道路。一个是专为汽车的必由之路不会站起来卡车。9吨卡车之一,在一个后轴不以道路为近万汽车造成很大损害。

农村道路可能携带日志卡车,牛奶车,消防部门消防车卡车,或施工设备。如果你不知道什么具体的道路将进行加载,一个好的经验法则是,设计为公路养护设备的最大一块将在道路上使用。

一个良好的构造和维修沥青路面应持续无大修或重建20年。道路设计,使用交通计数的项目

数量和20年到未来车辆的大小。这些仅仅是预测,在最好的,但他们将允许您计划穿越道路交通负荷的生活。

6.做好设计维护

无需维修道路将会迅速恶化并失败。设计你的道路,让他们可以很容易地维持。这意味着:可以定期清理沟渠充足

?以方便用户在春季定位标记暗渠

?雪足够的空间是翻耕后离开道路

?恰当的安全,维修斜坡,避免交叉雪堆

?是种植或处理,以防止水土流失路旁

?可安全地修剪路旁

一个拇指规则是足够的道路宽度,使其足够宽的扫雪机通过旅行方式,而不必离开其他车辆。7.准备工作做好才能铺设

这是没有必要所有的道路铺平立即。有一个精心打造和wellmaintained砂石路没有什么错的交通负荷及数量不需要铺设表面。每天三百辆是建议的最低证明铺路。

不要以为铺设沥青碎石路面修复将是失败的。在您铺平,请确保您有足够的基础,碎石排水良好,适当压缩。推荐的碎石基层的最低深度为10“路基土壤而定。

阿铺平道路时,才愿意将远远超越一个是构建太快

8.铺设从下往上开始

这似乎是显而易见的命令,但它意味着你不应该顶服饰或重铺道,如果问题出在一个基础层。在你做任何道路改善,找到任何表面问题的原因。选择一个改进技术,以解决问题。这可能意味着回收或清除所有道路材料到原生的土壤和重建。做任何工作,不解决问题是一种对金钱和精力的浪费。

9.预算好您的投资

道路系统可以是您的全市最大的投资。就像一个家庭需要油漆或一个新的屋顶,道路必须维持。威斯康星州的严重环境要求较温和的地方道路维修。做这些重要的保养活动:(1)表面-等级,形状,修补,密封裂缝,控制粉尘,消除冰雪

(2)渠- 清理和修复沟渠,涵洞;清除所有多余的材料

(3)路边- 切刷,修剪树木和路边种植面积,控制水土流失

(4)交通服务- 清洁和修理或更换的迹象

10.保持良好的记录

您的维护将更加具有良好的记录效率。知道了道路的建设,生活和修复历史让我们更容易的未来计划和预算

维修。记录也可以帮助您评估的修复方法和材料您使用的有效性。

保持良好的记录与库存系统的一个开始。它应包括巷道的历史和表面状况,确定和评估涵洞和桥梁,注意沟条件,肩膀,标牌,并作为挡土墙及护栏等结构。

更新您的库存,每年或当您修理或更换路段。一个正式的路面管理系统可以帮助使用这些记录,计划和预算道路改善工程。

资源

一个良好的路#17649,威斯康星大学麦迪逊分校,15分钟的基础知识。录像带。介绍了良好的道路十诫。免费租借录像带是通过县推广部门。

沥青PASER手册(39页),具体PASER手册(48页),砂石PASER手册(32页)。这些小册子包含大量的照片和路面描述来帮助你理解窘迫状况及其原因的类型。一个简单的程序,评级的条件可以帮助您管理您的人行道和计划修理。

Roadware,计算机存储和报告方案,路面状况的信息。公司开发的交通信息中心和威斯康星州的交通运输部加强,它使用PASER评级系统,提供为期五年的成本预算和道路修复/重建的优先名单。

从交通信息中心(TIC)获得威斯康星州的交通情况说明公告,。道路排水描述用于道路排水,肩膀,沟渠,涵洞。碎石路讨论了砾石路面的特点和如何维护之一,包括利用冬季道路养护盐和沙子及如何使用除冰化学品和沙子的实用技巧。涵洞的正确使用和安装,选择和大小涵洞,设计,安装和维护它们。土工织物在道路建设/维护和侵蚀控制,定义和常见的应用土工布在道路和控制水土流失。

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土木工程类专业英文文献及翻译

PA VEMENT PROBLEMS CAUSED BY COLLAPSIBLE SUBGRADES By Sandra L. Houston,1 Associate Member, ASCE (Reviewed by the Highway Division) ABSTRACT: Problem subgrade materials consisting of collapsible soils are com- mon in arid environments, which have climatic conditions and depositional and weathering processes favorable to their formation. Included herein is a discussion of predictive techniques that use commonly available laboratory equipment and testing methods for obtaining reliable estimates of the volume change for these problem soils. A method for predicting relevant stresses and corresponding collapse strains for typical pavement subgrades is presented. Relatively simple methods of evaluating potential volume change, based on results of familiar laboratory tests, are used. INTRODUCTION When a soil is given free access to water, it may decrease in volume, increase in volume, or do nothing. A soil that increases in volume is called a swelling or expansive soil, and a soil that decreases in volume is called a collapsible soil. The amount of volume change that occurs depends on the soil type and structure, the initial soil density, the imposed stress state, and the degree and extent of wetting. Subgrade materials comprised of soils that change volume upon wetting have caused distress to highways since the be- ginning of the professional practice and have cost many millions of dollars in roadway repairs. The prediction of the volume changes that may occur in the field is the first step in making an economic decision for dealing with these problem subgrade materials. Each project will have different design considerations, economic con- straints, and risk factors that will have to be taken into account. However, with a reliable method for making volume change predictions, the best design relative to the subgrade soils becomes a matter of economic comparison, and a much more rational design approach may be made. For example, typical techniques for dealing with expansive clays include: (1) In situ treatments with substances such as lime, cement, or fly-ash; (2) seepage barriers and/ or drainage systems; or (3) a computing of the serviceability loss and a mod- ification of the design to "accept" the anticipated expansion. In order to make the most economical decision, the amount of volume change (especially non- uniform volume change) must be accurately estimated, and the degree of road roughness evaluated from these data. Similarly, alternative design techniques are available for any roadway problem. The emphasis here will be placed on presenting economical and simple methods for: (1) Determining whether the subgrade materials are collapsible; and (2) estimating the amount of volume change that is likely to occur in the 'Asst. Prof., Ctr. for Advanced Res. in Transp., Arizona State Univ., Tempe, AZ 85287. Note. Discussion open until April 1, 1989. To extend the closing date one month,

英文文献翻译

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英文翻译 A comprehensive overview of substations Along with the economic development and the modern industry developments of quick rising, the design of the power supply system become more and more completely and system. Because the quickly increase electricity of factories, it also increases seriously to the dependable index of the economic condition, power supply in quantity. Therefore they need the higher and more perfect request to the power supply. Whether Design reasonable, not only affect directly the base investment and circulate the expenses with have the metal depletion in colour metal, but also will reflect the dependable in power supply and the safe in many facts. In a word, it is close with the economic performance and the safety of the people. The substation is an importance part of the electric power system, it is consisted of the electric appliances equipments and the Transmission and the Distribution. It obtains the electric power from the electric power system, through its function of transformation and assign, transport and safety. Then transport the power to every place with safe, dependable, and economical. As an important part of power’s transport and control, the transformer substation must change the mode of the traditional design and control, then can adapt to the modern electric power system, the development of modern industry and the of trend of the society life. Electric power industry is one of the foundations of national industry and national economic development to industry, it is a coal, oil, natural gas, hydropower, nuclear power, wind power and other energy conversion into electrical energy of the secondary energy industry, it for the other departments of the national economy fast and stable development of the provision of adequate power, and its level of development is a reflection of the country's economic development an important indicator of the level. As the power in the industry and the importance of the national economy, electricity transmission and distribution of electric energy used in these areas is an indispensable component.。Therefore, power transmission and distribution is critical. Substation is to enable superior power plant power plants or power after adjustments to the lower load of books is an important part of power transmission. Operation of its functions, the capacity of a direct impact on the size of the lower load power, thereby affecting the industrial production and power consumption.Substation system if a link failure, the system will protect the part of action. May result in power outages and so on, to the production and living a great disadvantage. Therefore, the substation in the electric power system for the protection of electricity reliability,

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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