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钢结构模拟测试(C)
一、单项选择题(将每题正确答案的序号填入括号内,每小题2分,共计30分)1.在结构设计中,失效概率与可靠指标的关系为()A.越大,越大,结构可靠性越差B.越大,越小,结构可靠性越差C.越大,越小,结构越可靠D.越大越大,结构越可靠2.钢材的三项主要力学性能为()A.抗拉强度、屈服点、伸长率B.抗拉强度、屈服点、冷弯性能C.抗拉强度、冷弯性能、伸长率D.冷弯性能、屈服点、伸长率3.钢中硫和氧的含量超过限量时,会使钢材()A.变软B.热脆C.冷脆D.变硬4.钢材在低温下,冲击韧性()A.提高B.降低C.不变D.不能确定5.钢材的疲劳破坏属于()破坏A.弹性B.塑性C.脆性D.低周高应变6.摩擦型连接的高强度螺栓在杆轴方向受拉时,承载力()A.与摩擦面的处理方法有关B.与摩擦面的数量有关C.与螺栓直径有关D.与螺栓的性能等级无关7.高强度螺栓摩擦型连接与承压型连接相比,()A.承载力计算方法不同B.施工方法相同C.没有本质区别D.材料不同8.在钢梁底面设有吊杆,其拉力设计值为650kN(静载),吊杆通过节点板将荷载传给钢梁,节点板采用双面焊缝焊于梁下翼缘,=10mm,=160MPa,则每面焊缝长度为()A.240mmB.250mmC.260mmD.270mm9.图所示为高强度螺栓连接,在弯矩M的作用下,可以认为中和轴在螺栓()上A.1B.2C.3D.410.一宽度为、厚度为的钢板上有一直径为的孔,则钢板的净截面面积为()A.B.C.D.11.a类截面的轴心压杆稳定系数值最高是由于()A.截面是轧制截面B.截面的刚度最大C.初弯曲的影响最小D.残余应力的影响最小12.轴心受压构件发生弹性失稳时,截面上的平均应力()A.低于钢材抗拉强度B.达到钢材屈服强度C.低于钢材比例极限D.低于钢材屈服强度13.保证工字形截面梁受压翼缘局部稳定的方法是()A.设置纵向加劲肋B.设置横向加劲肋C.采用有效宽度D.限制其宽厚比14.梁的支撑加劲肋应设置在()A.弯曲应力大的区段B.剪应力大的区段C.上翼缘或下翼缘有固定作用力的部位D.有吊车轮压的部位15.单轴对称截面的压弯构件,一般宜使弯矩()A.绕非对称轴作用B.绕对称轴作用C.绕任意轴作用D.视情况绕对称轴或非对称轴作用
二、判断题(正确的划“√”,错误的划“×”每小题2分,共计30分)1.正常使用极限状态包括影响结构、构件和非结构构件正常使用或外观的变形,影响正常使用的振动,影响正常使用或耐久性能的局部损坏( )2.计算结构或构件的强度,稳定性以及连接的强度时,应采用荷载设计值,而不是标准值3.试验证明,钢材的疲劳强度主要与构造状况、应力幅和循环荷载重复次数有关,而与钢材的强度关系更明显4.承受动力荷载重复作用的钢结构构件及其连接,当应力变化的循环次数n次时,应进行疲劳验算5.承压型高强螺栓连接只依靠被连接板件间强大的摩擦阻力承受外力,以摩擦阻力被克服作为连接承载能力的极限状态6.《钢结构设计规范》规定角焊缝中的最小焊角尺寸,其中t为较厚焊件的厚度7.构件上存在焊接残余应力会增大结构的刚度8.螺栓排列分为并列和错列两种形式,其中错列可以减小栓孔对截面的削弱,但螺栓排列松散,连接板尺寸较大9.设计轴心受力构件时,轴心受压构件只需进行强度和刚度计算10.轴心受压构件板件过薄,在压力作用下,板件离开平面位置发生凸曲现象,称为构件丧失局部稳定11.构件的长细比是回转半径与计算长度之比12.梁的抗剪强度不满足设计要求时,最有效的办法是增大腹板的面积13.工字形截面简支梁,当受压翼缘侧向支承点间距离越小时,则梁的整体稳定就越差14.偏心受压柱铰接柱脚只传递轴心压力和剪力,刚接柱脚除传递轴心压力和剪力外,还要传递弯矩15.框架的梁柱连接时,梁端采用刚接可以减小梁跨中的弯矩,但制作施工较复杂
三、简答题(每小题8分,共计24分)1.简述钢材塑性破坏和脆性破坏2.抗剪普通螺栓有哪几种可能的破坏形式?如何防止?3.设计拉弯和压弯构件时应计算的内容?
四、计算题(共计16分)如图所示已知焊缝承受的斜向静力荷载设计值kN,,偏心e为20mm,角焊缝的焊脚尺寸,实际长度,钢材为Q235B,焊条为E43型(=160N/mm2),取1.22验算图所示直角角焊缝的强度公式;;;;;;;;;图1试题答案及评分标准(供参考)
一、单项选择题(将每题正确答案的序号填入括号内,每题2分,共计30分)1.B2.A3.B4.B5.C6.C7.A8.C9.C10.D11.D12.C13.D14.C15.A
二、判断题(正确的划“√”,错误的划“×”每小题2分,共计30分)1.(√)2.(√)3.(×)4.(√)5.(×)6.(√)7.(×)8.(√)9.(×)10.(√)11.(×)12.(√)13.(×)14.(√)15.(√)
三、简答题(每题8分,共计24分)以下是各个简答题的要点,可根据具体情况酌情给分1.简述钢材塑性破坏和脆性破坏答塑性破坏是由于变形过大,超过了材料或构件可能的应变能力而产生的,而且仅在构件的应力达到钢材的抗拉强度后才发生,破坏前构件产生较大的塑性变形;脆性破坏前塑性变形很小,甚至没有塑性变形,计算应力可能小于钢材的屈服点,断裂从应力集中处开始2.抗剪普通螺栓有哪几种可能的破坏形式?如何防止?答螺栓抗剪连接达到极限承载力时,可能的破坏形式有四种形式
①栓杆被剪断;
②螺栓承压破坏;
③板件净截面被拉断;
④端板被栓杆冲剪破坏第
③种破坏形式采用构件强度验算保证;第
④种破坏形式由螺栓端距≥2d0保证第
①、
②种破坏形式通过螺栓计算保证3.设计拉弯和压弯构件时应计算的内容?答拉弯构件需要计算强度和刚度(限制长细比);压弯构件则需要计算强度、整体稳定(弯矩作用平面内稳定和弯矩作用平面外稳定)、局部稳定和刚度(限制长细比)
四、计算题(共计16分)以下是本题的答案要点,可根据具体情况酌情给分解将F分解为垂直于焊缝和平行于焊缝的分力(2分)(2分)(2分)(2分)(2分)(2分)(2分)直角角焊缝的强度满足要求(2分)BasketballcanmakeatrueclaimtobeingtheonlymajorsportthatisanAmericaninvention.FromhighschooltotheprofessionallevelbasketballattractsalargefollowingforlivegamesaswellastelevisioncoverageofeventsliketheNationalCollegiateAthleticAssociationNCAAannualtournamentandtheNationalBasketballAssociationNBAandWomensNationalBasketballAssociationWNBAplayoffs.AndithasalsomadeAmericanheroesoutofitsplayerandcoachlegendslikeMichaelJordanLarryBirdEarvinMagicJohnsonSherylSwoopesandothergreatplayers.Attheheartofthegameistheplayingspaceandtheequipment.Thespaceisarectangularindoorcourt.Theprincipalpiecesofequipmentarethetwoelevatedbasketsoneateachendinthelongdirectionofthecourtandthebasketballitself.Theballissphericalinshapeandisinflated.Basket-ballsrangeinsizefrom
28.5-30in72-76cmincircumferenceandinweightfrom18-22oz510-624g.Forplayersbelowthehighschoollevelasmallerballisusedbuttheballinmensgamesmeasures
29.5-30in75-76cmincircumferenceandawomensballis
28.5-29in72-74cmincircumference.Thecoveringoftheballisleatherrubbercompositionorsyntheticalthoughleathercoversonlyaredictatedbyrulesforcollegeplayunlesstheteamsagreeotherwise.Orangeistheregulationcolor.Atalllevelsofplaythehometeamprovidestheball.Inflationoftheballisbasedontheheightoftheballsbounce.Insidethecoveringorcasingarubberbladderholdsair.Theballmustbeinflatedtoapressuresufficienttomakeitreboundtoaheightmeasuredtothetopoftheballof49-54in
1.2-
1.4mwhenitisdroppedonasolidwoodenfloorfromastartingheightof6ft
1.80mmeasuredfromthebottomoftheball.Thefactorymusttesttheballsandtheairpressurethatmakestheballlegalinkeepingwiththebouncetestisstampedontheball.Duringtheintensityofhighschoolandcollegetourneysandtheprofessionalplayoffsthisinflatedspherecommandsconsiderableattention.Basketballisoneoffewsportswithaknowndateofbirth.OnDecember11891inSpringfieldMassachusettsJamesNaismithhungtwohalf-bushelpeachbasketsattheoppositeendsofagymnasiumandout-lined13rulesbasedonfiveprinciplestohisstudentsattheInternationalTrainingSchooloftheYoungMensChristianAssociationYMCAwhichlaterbecameSpringfieldCollege.Naismith1861-1939wasaphysicaleducationteacherwhowasseekingateamsportwithlimitedphysicalcontactbutalotofrunningjumpingshootingandthehand-eyecoordinationrequiredinhandlingaball.Thepeachbasketshehungasgoalsgavethesportthenameofbasketball.HisstudentswereexcitedaboutthegameandChristmasvacationgavethemthechancetotelltheirfriendsandpeopleattheirlocalYMCAsaboutthegame.TheassociationleaderswrotetoNaismithaskingforcopiesoftherulesandtheywerepublishedintheTriangletheschoolnewspaperonJanuary
151892.Naismithsfivebasicprinciplescenterontheballwhichwasdescribedaslargelightandhandledwiththehands.Playerscouldnotmovetheballbyrunningaloneandnoneoftheplayerswasrestrictedagainsthandlingtheball.Theplayingareawasalsoopentoallplayersbuttherewastobenophysicalcontactbetweenplayers;theballwastheobjective.Toscoretheballhadtobeshotthroughahorizontalelevatedgoal.Theteamwiththemostpointsattheendofanallottedtimeperiodwins.EarlyinthehistoryofbasketballthelocalYMCAsprovidedthegymnasiumsandmembershipintheorganizationgrewrapidly.Thesizeofthelocalgymdictatedthenumberofplayers;smallergymsusedfiveplayersonasideandthelargergymsallowedseventonine.Theteamsizebecamegenerallyestablishedasfivein1895andin1897thiswasmadeformalintherules.TheYMCAlostinterestinsupportingthegamebecause10-20basketballplayersmonopolizedagymnasiumpreviouslyusedbymanymoreinavarietyofactivities.YMCAmembershipdroppedandbasketballenthusiastsplayedinlocalhalls.Thisledtothebuildingofbasketballgymnasiumsatschoolsandcollegesandalsototheformationofprofessionalleagues.AlthoughbasketballwasbornintheUnitedStatesfiveofNaismithsoriginalplayerswereCanadiansandthegamespreadtoCanadaimmediately.ItwasplayedinFranceby1893;Englandin1894;AustraliaChinaandIndiabetween1895and1900;andJapanin
1900.From1891through1893asoccerballwasusedtoplaybasketball.Thefirstbasketballwasmanufacturedin
1894.Itwas32in81cmincircumferenceorabout4in10cmlargerthanasoccerball.Thededicatedbasketballwasmadeoflacedleatherandweighedlessthan20oz567g.Thefirstmoldedballthateliminatedtheneedforlaceswasintroducedin1948;itsconstructionandsizeof30in76cmwereruledofficialin
1949.Therule-setterscamefromseveralgroupsearlyinthe1900s.Collegesanduniversitiesestablishedtheirrulescommitteesin1905theYMCAandtheAmateurAthleticUnionAAUcreatedasetofrulesjointlystatemilitiagroupsabidedbyasharedsetofrulesandthereweretwoprofessionalsetsofrules.AJointRulesCommitteeforcollegestheAAUandtheYMCAwascreatedin1915andunderthenametheNationalBasketballCommitteeNBCmaderulesforamateurplayuntil
1979.InthatyeartheNationalFederationofStateHighSchoolAssociationsbegangoverningthesportatthehighschoollevelandtheNCAARulesCommitteeassumedrule-makingresponsibilitiesforjuniorcollegescollegesandtheArmedForceswithasimilarcommitteeholdingjurisdictionoverwomensbasketball.UntilWorldWarIIbasketballbecameincreasinglypopularintheUnitedStatesespeciallyatthehighschoolandcollegelevels.AfterWorldWarIIitspopularitygrewaroundtheworld.Inthe1980sinterestinthegametrulyexplodedbecauseoftelevisionexposure.BroadcastoftheNCAAChampionshipGamesbeganin1963andbythe1980scabletelevisionwascarryingregularseasoncollegegamesandevenhighschoolchampionshipsinsomestates.PlayerslikeBillRussellWiltChamberlainandLewAlcindorKareemAbdul-Jabbarbecamenationallyfamousatthecollegelevelandcarriedtheirfansalongintheirprofessionalbasketballcareers.Thewomensgamechangedradicallyin1971whenseparaterulesforwomenweremodifiedtomorecloselyresemblethemensgame.TelevisioninterestfollowedthewomenaswellwithbroadcastofNCAAchampionshiptourneysbeginningintheearly1980sandtheformationoftheWNBAin
1997.InternationallyItalyhasprobablybecometheleadingbasketballnationoutsideoftheUnitedStateswithnationalcorporateandprofessionalteams.TheOlympicsboostsbasketballinternationallyandhasalsospurredthewomensgamebyrecognizingitasanOlympiceventin
1976.AgaintelevisioncoverageoftheOlympicshasbeenexceptionallyimportantindrawingattentiontointernationalteams.ThefirstprofessionalmensbasketballleagueintheUnitedStateswastheNationalBasketballLeagueNBLwhichdebutedin
1898.Playerswerepaidonaper-gamebasisandthisleagueandotherswerehurtbythepoorqualityofgamesandtheever-changingplayersonateam.AftertheGreatDepressionanewNBLwasorganizedin1937andtheBasketballAssociationofAmericawasorganizedin
1946.Thetwoleaguescametoagreethatplayershadtobeassignedtoteamsonacontractbasisandthathighstandardshadtogovernthegame;underthesepremisesthetwojoinedtoformtheNationalBasketballAssociationNBAin
1949.ArivalAmericanBasketballAssociationABAwasinauguratedin1967andchallengedtheNBAforcollegetalentandmarketshareforalmosttenyears.In1976thisleaguedisbandedbutfourofitsteamsremainedasNBAteams.Unificationcamejustintimeformajortelevisionsupport.SeveralwomensprofessionalleagueswereattemptedandfailedincludingtheWomensProfessionalBasketballLeagueWBLandtheWomensWorldBasketballAssociationbeforetheWNBAdebutedin1997withthesupportoftheNBA.JamesNaismithoriginallyfromAl-monteOntarioinventedbasketballattheInternationalYMCATrainingSchoolinSpringfieldMassachusettsin
1891.Thegamewasfirstplayedwithpeachbasketshencethenameandasoccerballandwasintendedtoprovideindoorexerciseforfootballplayers.Asaresultitwasoriginallyaroughsport.AlthoughtenofNaismithsoriginalthirteenrulesremainthegamesoonchangedconsiderablyandthefounderhadlittletodowithitsevolution.ThefirstintercollegiategamewasplayedinMinnesotain1895withnineplayerstoasideandafinalscoreofninetothree.Ayearlaterthefirstfive-manteamsplayedattheUniversityofChicago.Basketswerenowconstructedoftwinenetsbutitwasnotuntil1906thatthebottomofthenetswereopen.In1897thedribblewasfirstusedfieldgoalsbecametwopointsfoulshotsonepointandthefirstprofessionalgamewasplayed.AyearlaterthefirstprofessionalleaguewasstartedintheEastwhilein1900thefirstintercollegiateleaguebegan.In1910inordertolimitroughplayitwasagreedthatfourfoulswoulddisqualifyplayersandglassbackboardswereusedforthefirsttime.NonethelessmanyrulesstilldiffereddependinguponwherethegameswereplayedandwhetherprofessionalscollegiansorYMCAplayerswereinvolved.CollegebasketballwasplayedfromTexastoWisconsinandthroughouttheEastthroughthe1920sbutmostteamsplayedonlyintheirownregionswhichpreventedanationalgameoraudiencefromdeveloping.ProfessionalbasketballwasplayedalmostexclusivelyintheEastbeforethe1920sexceptwhenateamwouldbarnstormintotheMidwesttoplaylocalteamsoftenafteraleaguehadfolded.Beforethe1930sveryfewgameseitherprofessionaloramateurwereplayedinfacilitiessuitableforbasketballorwithaperfectlyroundball.Somewereplayedinarenaswithchickenwireseparatingtheplayersfromfansthusthewordcagersotherswithpostsinthemiddleofthefloorandoftenwithbalconiesoverhangingthecornerslimitingtheareasfromwhichshotscouldbetaken.Untilthelate1930sallplayersusedthetwo-handsetshotandscoresremainedlow.Basketballinthe1920sand1930sbecamebothmoreorganizedandmorepopularalthoughitstilllaggedfarbehindbothbaseballandcollegefootball.Intheprosfiveurbanethnicteamsexcelledandplayedwithalmostnocollegegraduates.TheyweretheNewYorkOriginalCeltics;theClevelandRosenblumsownedbyMaxRosenblum;EddieGottliebsPhiladelphiaSPHAsSouthPhiladelphiaHebrewAssociation;andtwogreatblackteamstheNewYorkRenaissanceFiveandAbeSapersteinsHarlemGlobetrotterswhichwasactuallyfromChicago.WhiletheseteamshadsomenotableplayersnosuperstarssuchasBabeRuthJackDempseyorRedGrangeemergedtocapturethepublicsattentionastheydidinothersportsoftheperiod.Thesamewastrueincollegebasketballupuntilthelate1930swithcoachesdominatingthegameanditsdevelopment.WalterDocMeanwellatWisconsinForrestPhogAllenatKansasWardPiggyLambertatPurdueandHenryDocCarlsonatPittsburghallmadesignificantcontributionstothegamesdevelopment:zonedefensestheweavethepassinggameandthefastbreak.InthedecadeprecedingWorldWarIIfiveeventschangedcollegebasketballandallowedittobecomeamajorspectatorsport.In1929therulescommitteereversedadecisionthatwouldhaveoutlaweddribblingandslowedthegameconsiderably.FiveyearslaterpromoterEdwardNedIrishstagedthefirstintersectionaltwinbillinMadisonSquareGardeninNewYorkCityandattractedmorethan16000fans.HedemonstratedtheappealofmajorcollegeballandmadeNewYorkitscenter.InDecember1936HankLuisettiofStanfordrevealedthevirtuesoftheone-handedshottoanamazedGardenaudienceandbecamethefirstmajorcollegiatestar.SoonthereafterLuisettiscoredanincrediblefiftypointsagainstDuquesnethusendingtheEastsdevotiontothesetshotandencouragingamoreopengame.Inconsecutiveyearsthecenterjumpwaseliminatedafterfreethrowsandthenafterfieldgoalsthusspeedingupthegameandallowingformorescoring.In1938IrishcreatedtheNationalInvitationTournamentNITintheGardentodetermineanationalchampion.AlthoughpostseasontournamentshadoccurredbeforetheNITwasthefirstwithmajorcollegesfromdifferentregionsandprovedtobeagreatfinancialsuccess.TheNationalCollegiateAthleticAssociationNCAAcreateditsownpostseasontournamentin1939butdidnotrivaltheNITinprestigeforsometime.The1940ssawsignificantchangesforcollegebasketball.PlayersbeganusingthejumpshotafterKennySailorsofWyomingwowedtheEastwithitin
1943.Thebehind-the-backdribbleandpassalsoappearedasdidexceptionalbigmen.BobKurlandatOklahomaAMwasalmostsevenfeettallandGeorgeMikanatDePaulwassixfeetteninches.WhileKurlandhadperhapsthebettercollegecareerandplayedintwoOlympicshechosenottoplayprofessionalballwhereasMikanbecamethefirstdominantstarinthepros.Theirdefensiveplayinspiredtheruleagainstgoaltendingblockingashotonitsdownwardflight.AdolphRuppwhoplayedunderPhogAllenalsocoachedthefirstofhismanytalentedteamsatKentuckyinthatdecade.Howeverin1951Ruppandsixothercoachessufferedthroughapoint-shavingscandalthatinvolvedthirty-twoplayersatsevencollegesandseriouslyinjuredcollegebasketballparticularlyinNewYorkwherefourofthesevenschoolswerelocated.WhilethegamesurvivedtheNCAAmoveditstournamentawayfromMadisonSquareGardentodifferentcitieseachyearandtheNITsprestigebegantodecline.Professionalbasketballremainedadisorganizedandstodgysportupuntilthelate1940swithbarnstormingstillcentraltothegameandmostplayersstillusingthesetshot.In1946howeverhockeyownersledbyMauricePodoloffcreatedtheBasketballAssociationofAmericaBAAintheEasttofilltheirarenasbutfewfanscameevenafterJoeFulksofPhiladelphiaintroducedthejumpshot.TheBAAsrivaltheNationalBasketballLeaguehadexistedsincethe1930shadbetterplayerslikeMikanoftheMinneapolisLakersBobDaviesoftheRochesterRoyalsandDolphShayesoftheSyracuseNationalsbutoperatedinmuchworsefacilitiesanddidnotdomuchbetteratattractingaudiences.In1948PodoloffluredtheLakersRoyalsandtwootherteamstotheBAAandproposedamergerofthetwoleaguesforthe1949–1950season.TheresultwastheNationalBasketballAssociationNBAwithPodoloffitsfirstcommissioner.Theseventeen-teamleaguestruggledatfirstbutsoonreduceditssizeandgainedstabilityinlargepartbecauseofMikansappealandPodoloffsskills.Despitethepoint-shavingscandalcollegeballthrivedinthe1950slargelybecauseithadprolificscorersandmoregreatplayersthaninanypreviousdecade.FrankSelvyofFurmanandPaulArizinofVillanovabothaveragedoverfortypointsearlyinthedecadewhileClarenceBevoFrancisoftinyRioGrandeCollegeinOhioamazedfansbyscoring116pointsinonegamewhileaveraging50pergameforaseason.Thedecadealsowitnessedsomeofthemosttalentedandcompleteplayersever.TomGolaatLaSalleBillRussellatSanFranciscoWiltChamberlainatKansasElginBayloratSeattleJerryWestatWestVirginiaandOscarRobertsonatCincinnatiallhadphenomenalskillsthathavesincebeenthemeasureofotherplayers.Andin1960oneofthebestteamseverOhioStatewontheNCAAtitleledbyJerryLucasandJohnHavlicek.Professionalbasketballunderwentmajorchangesinthe1950sthathelpedincreaseitspopularity.In1950EarlLloydfromWestVirginiaplayedfortheWashingtonCapitolsandbecamethefirstAfricanAmericantoplayintheNBA.In1954DannyBiasoneowneroftheSyracuseNationalspersuadedtheNBAtoinstitutethetwenty-four-secondshotclockrequiringateamtoshootwithinthattime.ThiseliminatedtheslowpacethathadlongprevailedintheprosandmadetheNBAmoreexciting.Teamsnowscoredonehundredpointsagameregularly.Theleaguealsonowawardedfoulshotswhentheotherteamreceivedmorethanfivepersonalfoulsaperiodgreatlyreducingtheroughplaythathadhurttheprogame.In1956RedAuerbachoftheBostonCelticsmadethebestdealinNBAhistorywhenheacquiredthedraftrightstoBillRussellthedefensiveplayerandrebounderheneededtocomplementBobCousyandBillSharmaninthebackcourt.WiththeadditionofRusselltheCelticsbecamethebestproteameverwinningelevenofthenextthirteenchampionshiptitlesbeforeexpansiondilutedthetalentintheNBA.TheSt.LouisHawkswithBobPettitbeattheCelticsin1958andthePhiladelphia76erswithChamberlainbeatthemin
1967.ButRussellaplayer-coachfortwotitlesandhisteammatesformedthegreatestdynastyinproball.EventheLosAngelesLakerswhohadmovedfromMinneapolisin1960withWestandBaylorwerenomatchfortheCelticsovertheseyears.WhileWestBaylorChamberlain—whoaveragedoverfiftypointsagamein1962—andOscarRobertson—whointhesameyearaveragedatripledoublepergameinpointsassistsandrebounds—weresuperiortoanyindividualCelticnootherteamcouldconsistentlyplaydefensere-boundandrunwiththeCeltics.。