土木工專業(yè)英語第十七課steel structure

1、Lesson17 Steel Structure Present by:Xu Yajun Qi Pengfei Email: Cellphone number15239189807The ContextKey word Structure Category The SpecificationReferenceKey wordsFramed structureEnd connectionAlong withDiagonal bracingShell-type structureStiffSuspension bridgeSubsystemStiffening truss

2、SynthesizeAdventFeasible 框架結構框架結構端部連接，連接端端部連接，連接端沿著，連同沿著，連同一起，與一起，與一一道，隨同道，隨同一起一起對角支撐，斜撐對角支撐，斜撐殼體結構殼體結構adj. adj. 堅硬的，不易彎曲的堅硬的，不易彎曲的懸索橋，吊橋懸索橋，吊橋n.n.子系統(tǒng)子系統(tǒng)加勁桁架加勁桁架綜合，合成綜合，合成出現，到來出現，到來可實行的，切實可行的，行得通可實行的，切實可行的，行得通的的ElaborateAbsurdGrosslyConservativeSynonymousFacetPlumbingSanitationReserveYield stressFor

3、mulationthrust精心制作的，詳細闡述的，精心制作的，詳細闡述的，荒謬的，可笑的，不合理的荒謬的，可笑的，不合理的非常，粗，很，大體，大概非常，粗，很，大體，大概保守的，守舊的保守的，守舊的意思相同的（意思相同的（with),with),同義的同義的方面方面管道工程，管道設備，水暖設備管道工程，管道設備，水暖設備公共衛(wèi)生，環(huán)境衛(wèi)生，衛(wèi)生設備公共衛(wèi)生，環(huán)境衛(wèi)生，衛(wèi)生設備 （尤指地下水道設備）（尤指地下水道設備）預留，儲存，儲備預留，儲存，儲備屈服應力屈服應力用公式表示，明確地表達用公式表示，明確地表達推力推力lesson17 steel structuresstructure cate

4、gory1.framed structures,where elements may consist of tension members,columns,beams,and members under combined bending and axial load.2.shell-type structures,where axial stresses predominate.3.suspension-type structures ,where axial tension predominate the principal system.framed structures A multis

5、tory building is three-dimensional,it usually designed to be much stiffer in one direction than the other,thus it may reasonably be treatd as a series of plane frames. However,if the framing is such that the behavior of the member in one plane substantially influences the behaviors in another plane,

6、the frame must be treated as a three-dimensional space frame.shell-type structuresin this type of structure the shell serves a service function in addition to participation in carrying loads.On many shell-type structures,a framed structure may be used in conjunction with the shell.On walls and flat

7、roofs the skinelements may be in compression while they act together with a framework.suspension-type structures In this suspension-type structure tension cables are major supporting elements.A roof may be cable-supported. Probably the most common structures of this type is the suspension bridge.Usu

8、ally a subsystem of this structure consists of a framed structure,as in the stiffening truss for the suspension bridge.Since the tension element is the most efficient way of carrying load,structures utilizinng this concept are increasingly being used.Many unusual structures utilizing various combina

9、tion of framed,shell-type,and suspension-type structures have been built. The specificationThe specifications of AISC are the result of the combined judgment of researchers and practicing engineers.美國鋼結構學會的規(guī)范是結合研究者和有經驗的工程師綜合判斷的結果。The research efforts have been synthesized into practical design proce

10、dures to provide a safe economical structures.研究工作成果已經綜合運用到施工工序來提供一個安全的經濟結構。The advent of digital computer in design practice has made feasible more elaborate design rule.數字計算機的出現在設計實踐中制作出可行的更為詳細的設計規(guī)則。 A specification containing a set of rule is intended to insure safety;however,the design must unde

11、gstand the behavior for which the rule applies,otherwise an absurd,a grossly conservative,and sometimes unsafe design may result. “is intended to”意思是 “意在、旨在”。 Some specifications become a legal set of rules since it has been adopted by the states. 一些規(guī)范已經成為一套合法的規(guī)則，因為它們已經被國家采納。The design must provide

12、for some reserve strength which is needed to carry the service loads;that is,the structure must provide for the possibility of overload which can arise from changing the use for which a particuiar structure was designed,from underestimation of the effects of load by oversimlifications in structural

13、analysis,and from variation in construction procedures.設計必須提供一些儲備載荷，這是需要承受使用載荷；即結構必須提供超載的可能性，超載可能來自于改變某一個結構原來的設計用途、在結構設計中采用了過度簡化的方法而低估了荷載的作用、以及在施工工序中的變化。Structural design must provide for adequate safety no matter what phiosophy of design is used.The study of what constitutes the proper formulation of structural safety has been continuing during the past 30years,The main thrust has been to examine by various probabilistic methods the chances of failureoccurring in a member,connection,or system.ReferenceAISC-341-02 （美國鋼結構抗震規(guī)范）William T.