首页 > 领导讲话 > 农业讲话 / 正文
第五章作业(中英文对照)
2021-02-24 11:16:50 ℃第五章作业(中英文对照)
)
A.抗弯强度、腹板折算应力、整体稳定、局部稳定B.抗弯强度、抗剪强度、整体稳定、局部稳定C.抗弯强度、腹板上边缘局部承压强度、整体稳定、容许挠度D.抗弯强度、抗剪强度、整体稳定、容许挠度1.ForhotrolledH-shapedcrosssectionsteelbeambearingdistributedload,(
)shouldbechecked.A.bendingstrength,equivalentstressontheweb,overallstabilityandlocalstability.B.bendingstrength,shearstrength,overallstabilityandlocalstability.C.bendingstrength,localbearingstressatupperedgeoftheweb,overallstability.D.bendingstrength,,shearstrength,overallstability,allowabledeflection.
2.以下计算,使用毛截面特性的是(
)
A.梁的弯曲正应力
B.梁的剪应力
C.折算应力
D.疲劳验算2.Inwhichofthefollowingcalculation,thegross-sectioncharacteristicisadapted?(
)A.Bendingnormalstressofthebeam
B.ShearstressofthebeamC.Equivalentstress
D.Fatiguecheck
3.某一在主平面内受弯的实腹式构件,当截面上有螺栓孔时,下列何项计算要考虑孔洞削弱?(
)
A.构件变形计算
B.构件整体稳定性计算
C.构件抗弯强度计算
D.构件抗剪强度计算3.Forsolid-webmembersbendinginprincipleplane,supposingthatboltholesappearsinthecross-section,weakenfactorsoftheboltholesshouldbeconsideredduringthecalculationof(
).A.calculatingthedeformationofthemember
B.checkingtheoverallstabilityofthememberC.checkingthebendingstrengthofthememberD.checkingtheshearstrengthofthemember
4.设计焊接工字形截面梁时,腹板布置横向加劲肋的主要目的是提高梁的(
)A.抗弯刚度
B.抗弯强度
C.整体稳定性
D.局部稳定性4.InthedesignoftheweldedI-shapedcrosssectionbeams,themaintargetofarrangingtransversestiffenerstothewebsistoensurethe(
)ofthebeamA.FlexuralstiffnessB.FlexuralresistanceC.overallstabilityD.localstability
5.梁的支承加劲肋应设置在(
)
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5.Bearingstiffenersshouldbearrangedat(
)ofthebeamA.wherethebendingstressisgreatB.wheretheshearstressisgreatC.wheretheconcentratedforceactedD.wherethewheelloadacted
6.在梁的整体稳定计算中,若稳定系数为1.0,说明该梁(
)
A.处于弹性工作阶段
B.不会丧失整体稳定C.梁的局部稳定必然满足
D.不会发生强度破坏6.Duringthecalculationtotheoverallstabilityofthebeam,theconditionthatthestabilitycoefficientis1.0indicatesthat(
)A.thebeamisinelasticstageB.overallbucklingwouldnothappenC.thebeamwouldsatisfytherequirementsofavoidinglocalbucklingD.thestrengthfailurewouldnothappen
7.梁承受固定集中荷载作用,采用以下何项措施是合适的?(
)
A.加厚翼缘
B.在集中荷载作用处设置支承加劲肋C.增加横向加劲肋的数量
D.加厚腹板7.Forbeambearingthedeterminedconcentratedload,whichofthefollowingeffectsisfavorable?(
)A.ThickentheflangeofthebeamB.ArrangebearingstiffenersatwheretheconcentratedloadsappliedC.Increasethenumberofthetransversestiffeners.D.Thickenthewebofthebeam
8.验算无集中荷载作用时工字形截面梁的折算应力,公式为f1223,这里?、?应为()
A.验算截面的最大正应力和最大剪应力B.验算截面的最大正应力和验算点的剪应力C.验算截面的最大剪应力和验算点的正应力
D.验算截面中验算点的正应力和剪应力8.WhilecheckingtheequivalentstressoftheI-shapedcross-sectionbeamwithoutbearingconcentratedloads,theexpressionf1223isapplied.Inthisexpression,?,?
represents(
).A.themaximumnormalstressandshearstressofthecheckingsection;B.themaximumnormalstressofthecheckingsectionandtheshearstressofthecheckingpoint;C.themaximumshearstressofthecheckingsectionandthenormalstressofthecheckingpoint;
D.thenormalstressandshearstressofthecheckingpointinthecheckingsection
9.跨中无侧向支承的焊接截面梁,当验算整体稳定不满足时,宜采取以下何项措施?(
)。
A.加大梁的截面积
B.加大梁的高度C.加大受压翼缘板的宽度
D.加大腹板的厚度9.Forweldedcrosssectionbeamswithoutthelateralsupportsinthemid-span,iftheoverallstabilitycouldnotbesatisfied,whichofthefollowingmeasuresshouldbeadapted?(
)A.Increasethecross-sectionofthebeamB.IncreasetheheightofthebeamC.WidenthewidthoftheflangeundercompressionD.Thickenthewebofthebeam
10.受压翼缘由刚性铺板连牢的梁,不必考虑计算的是(
)。
A.强度
B.刚度
C.整体稳定
D.局部稳定10.Forbeamthatrigiddeckingissecurelyconnectedtothecompressionflangeofit,itisnotnecessarytocheckthe(
)ofthebeam.A.strengthB.stiffnessC.overallstabilityD.localstability
11.双轴对称工字形截面梁,经验算,其强度和刚度正好满足要求,而腹板在弯曲应力作用下有发生局部失稳的可能。在其他条件不变的情况下,宜采用下列何种方法可以保证梁的局部稳定?(
)
A.增加梁腹板的厚度
B.降低梁腹板的高度C.用强度更高的材料
D.设置加劲肋11.FordoublesymmetricI-shapedcrosssectionbeam,localbucklingispossibletoappearsundertheactionoftheflexuralstresswhilethestrengthandthestiffnesscanjustbesatisfiedthroughthechecks.Ifmaintainingotherconditionsbeingequal,whichofthefollowingmeasurescouldensurethelocalstabilityofthebeam?(
)A.IncreasethethicknessofthewebB.ReducetheheightofthewebC.AdaptmaterialswithhigherstrengthD.Arrangelateralsupports
12.验算工字形截面梁受压翼缘的局部稳定性时要求/bt应小于某一限值,这里,b的含义为(
)。
A.翼缘板外伸宽度
B.翼缘板全部宽度C.翼缘板全部宽度的1/3
D.翼缘板的有效宽度12.WhilecheckingthelocalstabilityofthecompressedflangeoftheI-shapedcrosssectionbeam,the/bt
shouldbelowadeterminedlimit.Here,brepresents(
).A.theoutstandsoftheflange
B.thewidthoftheflangeC.the1/3widthoftheflangeD.theeffectivewidthoftheflange
13.防止梁腹板发生局部失稳,常采取加劲措施,这是为了()
A.增加梁截面的惯性矩
B.增加截面面积C.改变构件的应力分布状态
D.改变边界约束板件的宽厚比13.Inordertopreventthelocalbuckingofthewebofthebeam,arrangingthestiffenerstothewebisadapted,soasto(
).A.increasetheinertiamomentofthebeamsectionB.increasetheareaofcrosssectionC.changethestressdistributingstateofthebeamD.changethewidthtothicknessratiooftheboundaryconstraintplates
14.焊接工字形截面梁设计时估算最小梁高minh,若用Q345钢材代替Q235钢材,则minh如何变化?(
)
A.变大了
B.变小了
C.不变
D.条件不充足,无法确定14.TheestimatingminimumheightoftheweldedI-shapedsectionbeamisminh,iftheQ345isappliedtoreplacetheQ235steel,howwouldthevalueofminhchange?(
).A.IncreasingB.DecreasingC.Invariant
D.Thevariationcannotbedeterminedduetothelackofconditions
15.加强受压翼缘的单轴对称工字形等截面简支梁,跨中有一集中荷载作用在腹板平面内,下列各荷载作用位置。何者的整体稳定性最好?(
)
A.上翼缘(受压翼缘)上表面
B.形心与上翼缘之间的截面剪力中心C.截面形心
D.下翼缘(受拉翼缘)下表面15.ForreinforcedcompressionflangewithsinglysymmetricI-shapedsimplesupportbeamwithuniformsection,aconcentratedforceisappliedtothemid-spanwebplane.Whichofthefollowingloadpositionsismostfavorabletotheoverallstabilityofthebeam?(
).A.Theuppersurfaceoftheupperflange(theflangeundercompression)B.ShearcenterofthesectionbetweenthecentroidandtheupperflangeC.CentroidofthesectionD.Thelowersurfaceofthebottomflange(theflangeundertension)
16.对于焊接工字形等截面简支梁,当其整体稳定性不能满足要求时,采用下列何项措施能最有效提高整体稳定性?(
)
A.加厚受压翼缘
B.加厚受拉翼缘C.采用更高强度的钢材
D.在梁跨中受压翼缘处设置侧向支承
16.ForweldedI-shapeduniformsectionsimplysupportbeam,iftheoverallstabilityofthebeamcouldnotbesatisfied,theoverallstabilitycanbeimprovedbywhichofthefollowingmeasures?(
)A.ThickenthecompressionflangeB.ThickenthetensionflangeC.AdaptthesteelwithhigherstrengthD.Arrangethelateralsupportatthemid-spancompressionflangeofthebeam
17.某焊接工字形等截面简支梁,若最大弯矩值一定,在下列不同形式的荷载作用下,何者的整体稳定性最差?(
)
A.两端有相等弯矩作用(纯弯曲作用)
B.满跨均布荷载作用C.跨中点有集中荷载作用D.在距离支座1/4跨度处各有相同一集中力17.ForweldedI-shapeduniformsectionsimplysupportbeam,ifthemaximummomentisdetermined,underwhichtypeofthefollowingloadstheoverallstabilityismostunfavorable?(
)A.Therearesamevaluedmomentappliedtobothendsofthebeam(purebendingactions)B.Therearedistributedforceapplyingtothefull-spanofthebeam.C.Thereisaconcentratedforceapplyingtothemid-spanofthebeam.D.Therearetwosameconcentratedforcesapplyingtothe1/4spanawayfromthesupportofbeam.
18.一焊接工字形截面梁,腹板计算高度0h=2400mm,根据腹板局部稳定计算和构造要求,需要在腹板一侧配置钢板横向加劲肋,其经济合理的截面尺寸是(
)
A.-8×120
B.-8×140
C.-10×150
D.-12×18018.ForweldedI-shapedsectionbeam,theeffectiveheightoftheweb0h=2400mm,inaccordancewiththecalculationtothelocalstabilityofthewebandtheconstructionrequirements,thetransversestiffenersshouldbearrangedtoonesideoftheweb.Therefore,whichdimensionofthetransversestiffenersisbotheconomicalandreasonable?(
)
A.-120×8
B.-140×8
C.-150×10
D.-180×12
19.为了提高荷载作用在上翼缘简支工字形梁的整体稳定性,可在梁的(
)加侧向支承,以减小梁出平面的长度。
A.梁腹板高度的12处
B.靠近梁上翼缘的腹板011(~)54h处C.靠近梁下翼缘的腹板011(~)54h处
D.上翼缘处19.InordertoimprovetheoverallstabilityofthesimplesupportI-shapedbeamwhichtheloadisappliedtotheupperflange,lateralsupportcanbearrangedtothe(
)ofthebeam,which
aimsatreducingtheout-ofplanelengthofthebeam.A.1/2heightoftheweb
B.1/5~1/4heightawayfromtheupperflangeoftheweb
C.1/5~1/4heightawayfromthebottomflangeoftheweb
D.upperflange
二、简答题
1.简述影响钢梁整体稳定因素有哪些?
2.采用高强度钢材对提高梁的整体稳定性是否有益,为什么?
三、计算题1.Simplysupportbeamsubjectedtoauniformlydistributedliveload(norequirementoftakingaccountofdeadweight),Q235Bsteelisused.I32a,l=6m,allowabledeflection250][l,partialcoefficientis1.4forthedeadloadsandis1.2forliveloads,bendingmomentsaboutx-axis,accordingtonormalstressandrigidcondition,Determinedesignloadofthebeam.2/235(mmNfy?,2/215mmNf?,45384xqlEI,25/1006.2mmNE)。
2.Asimply-supportmainbeamshowninfollowFigure,P=250kN(designvalue,fromsecondarybeams),Q235steelisused,f=215N/mm2,Vf=125N/mm2,05.1?x?
1)Checkthestrengthofthemainbeam.
2)Checkthelocalstabilityofplates
3.ThefigureshowstheweldedI-shapedsimplesupportbeam.Alateralsupportisarrangedatthemid-spanupperflangeofthebeam,thematerialisQ345B,thedesignvalueofconcentratedstatic
loadPis300kN.Pleasechecktheoverallstabilityofthebeam.
4.Thespanofasimplesupportbeamis5.5m,astaticdistributedloadisappliedtotheupperflangeofthebeam,thestandardvalueofdeadloadis10.2kN/m(thedeadweightisnotconcluded),thestandardvalueofliveloadis25kN/m.Supposedthatthecompressionflangeofthebeamhavethereliablelateralsupport,thesteelisQ235,theallowabledeflectionisl/250,pleaseselectthemosteconomicI-shapedandH-shapedcrosssections,andcomparethemtherefore.5.P142
5.6题
猜你喜欢
- 2024-01-13 关于农业保险调研报告
- 2024-01-06 2024年区农业农村局工作总结(2024年)
- 2024-01-06 主题教育党课讲稿(农业)
- 2024-01-01 关于农业保险调研报告
- 2024-01-01 品牌农业工作总结(全文完整)
- 2023-10-20 农业中级职称申报总结3篇
- 2023-10-19 2023农业系统年终总结14篇【完整版】
- 2023-09-24 农业项目工作总结5篇【精选推荐】
- 2023-08-22 关于农业工作计划锦集4篇
- 2023-07-09 县农业农村局人才工作述职报告【完整版】
- 搜索
-
- 关于中国共产党员佩戴党徽规定 06-05
- 台海局势与中国统一【范文:关于台海局 01-05
- 当前派出所基层基础工作存在的问题 03-26
- 党风廉政会议议程 09-03
- 组织生活会整改落实工作方案 09-30
- 某县委关于2019年度民主生活会查摆问题 07-01
- 镇党委书记与村(社区)书记谈心谈话情 10-14
- 派出所个人现实表现材料 03-12
- “抖音”短视频大赛征集活动方案 04-29
- 《以案为鉴,警钟长鸣》学习心得体会 04-26
- 11-25国庆70周年庆典晚会 庆典晚会串词
- 11-25办公室礼仪的十大原则 浅谈办公室的电话礼仪
- 01-17用心灵轻轻地歌唱_心灵的歌唱
- 01-17也许你不是我一生的唯一|也许不是我
- 01-17爱了,请珍惜;不爱,趁早放手|爱就珍惜不爱就放手
- 01-17岁月带走的是记忆,但回忆会越来越清晰|有趣又有深意的句子
- 01-17曾经的美好只是曾经,我只想珍惜身边的人|我只想珍惜你
- 01-18从容不惊 [学会笑眼去看世界,不惊不乍,淡定从容]
- 02-03当代大学生学习态度调查报告
- 02-03常用护患英语会话
- 标签列表