2017年电大土木工程力学形成性考核册小抄参考

作业一参考答案一、选择题1B2C3C4D5D6D7A8B9A10D二、判断题12345678910三、试对图示平面体系进行几何组成分析。（每小题5分，共20分）1解由二元体分析法原结构是一个无多余约束的几何不变体系。2解由二元体分析法原结构是一个无多余约束的几何不变体系。3解显然，体系是具有两个多余约束的几何不变体系。4解由三刚片规则，可知体系是无多余约束的几何不变体系。四、绘制下图所示各结构的弯矩图。（每小题10分，共30分）1作弯矩图如下10KN/M20KN3M1M3MABCDABCD560601125M图（KNM）2解作弯矩图如下3解作弯矩图如下五、计算图示桁架中指定杆件的内力。解求支座反力由AM0L/2LABCDL/2FPFPLABCDFPLP34M图20KN/M40KN2M4MABCD40KN2M2M2MEFABCEFD4040120M图（KNM）123AABCDAAAFPFPABPF4A2F3A0AA5由Y0APPFF43用截面将桁架截开，保留右边部分，受力如图由YF0N1P5SIN4F0（压）12F由CM0PN315AFCOS45A04AA（拉）3F2取结点C为研究对象，作受力图如下显然（压）N2P作业二参考答案一、选择题1D2C3B4D5D二、判断题12345CDFN1FN4FN3FPP5F4CFN2FN4FPFN4九、用力法计算下列刚架。作业三参考答案一、选择题1A2C3D4D5A二、判断题12345作业四参考答案一、选择题1A2C3A4B5C二、判断题12345三、画图示伸臂梁MK，FRA的影响线。（10分）解用机动法作影响线如下ABCK1MK影响线12M2MABC2MK四、绘制伸臂梁C截面、D截面的弯矩影响线和剪力影响线。（10分）解用机动法作影响线如下五、作图示梁FYA、MC的影响线，并利用影响线计算图示荷载作用下的FYA、MC值。（20分）ABC1/2FRA影响线11M3MDC15M05MC05MC影响线075C05FQC影响线075025D15MD影响线D1FQD影响线解作FYA、MC影响线如下计算FYA、MC的值YA11205283025C4KNMA六、试求图示体系的自振频率。EI常数，杆长均为L。（10分）2M2MAC2M1MB12KN12KN8KN/MAFYA影响线1025CAMC影响线1CLML解（1）计算柔度系数11用力法作图示M图，如图所示。由M图应用图乘法，可求得柔度系数113121L2127LLEI3EI3EI312EI（2）体系自振频率为331I7MML2EIA七、求图示体系的自振频率。忽略杆件自身的质量。（15分）解由下图列出体系动力学平衡方程对A点取矩，列出体系动力学平衡方程Y3YMK022LLAAMP1M图1LL05LL/2MLML/2KEIAL/2MLML/2KEIYY23Y2A其中和为惯性力，为弹性力。YM2LA3Y2AKY又，代入动力学平衡方程，整理后得LLAK05A故得2M八、求图示体系的自振频率。质量M集中在横梁上。各杆EI常数。（15分）解取横梁为研究对象，计算刚度系数由XF0133EI2I18EKHH结构的自振频率为13IMEIMHEIEIEI13IHK11312IH3EIHWINGERTUIVASASHECK,WHOSCOREDTWOTRIESINTHEKIWIS2018SEMIFINALWINOVERENGLAND,HASBEENPASSEDFITAFTERALOWERLEGINJURY,WHILESLATERHASBEENNAMEDATFULLBACKBUTISSTILLRECOVERINGFROMAKNEEINJURYAGGRAVATEDAGAINSTUSABOTHSIDESBOAST100RECORDSHEADINGINTOTHEENCOUNTERBUTAUSTRALIAHAVENOTCONCEDEDATRYSINCEJOSHCHARNLEYSEFFORTINTHEIRFIRSTPOOLMATCHAGAINSTENGLANDONTHEOPENINGDAYAUSSIEWINGERJARRYDHAYNEISTHECOMPETITIONSTOPTRYSCORERWITHNINE,CLOSELYFOLLOWEDBYTUIVASASHECKWITHEIGHTBUTITISRECENTLYNAMEDRUGBYLEAGUEINTERNATIONALFEDERATIONPLAYEROFTHEYEARSONNYBILLWILLIAMSWHOHASATTRACTEDTHEMOSTINTERESTINTHETOURNAMENTSOFARTHEKIWIWITHATOURNAMENTHIGH17OFFLOADSHASTHECHANCEOFBECOMINGTHEFIRSTPLAYERTOWINTHEWORLDCUPINBOTHRUGBYLEAGUEANDRUGBYUNIONAFTERTRIUMPHINGWITHTHEALLBLACKSIN2011“IDGIVEEVERYAWARDBACKINAHEARTBEATJUSTTOGETACROSSTHELINETHISWEEKEND,“SAIDWILLIAMSTHELACKOFAIRUPTHEREWATCHMCAYMANISLANDSBASEDWEBB,THEHEADOFFIFASANTIRACISMTASKFORCE,ISINLONDONFORTHEFOOTBALLASSOCIATIONS150THANNIVERSARYCELEBRATIONSANDWILLATTENDCITYSPREMIERLEAGUEMATCHATCHELSEAONSUNDAY“IAMGOINGTOBEATTHEMATCHTOMORROWANDIHAVEASKEDTOMEETYAYATOURE,“HETOLDBBCSPORT“FORMEITSABOUTHOWHEFELTANDIWOULDLIKETOSPEAKTOHIMFIRSTTOFINDOUTWHATHISEXPERIENCEWAS“UEFAHASOPENEDDISCIPLINARYPROCEEDINGSAGAINSTCSKAFORTHE“RACISTBEHAVIOUROFTHEIRFANS“DURINGCITYS21WINMICHELPLATINI,PRESIDENTOFEUROPEANFOOTBALLSGOVERNINGBODY,HASALSOORDEREDANIMMEDIATEINVESTIGATIONINTOTHEREFEREESACTIONSCSKASAIDTHEYWERE“SURPRISEDANDDISAPPOINTED“BYTOURESCOMPLAINTINASTATEMENTTHERUSSIANSIDEADDED“WEFOUNDNORACISTINSULTSFROMFANSOFCSKA“BAUMGARTNERTHEDISAPPOINTINGNEWSMISSIONABORTEDTHESUPERSONICDESCENTCOULDHAPPENASEARLYASSUNDATHEWEATHERPLAYSANIMPORTANTROLEINTHISMISSIONSTARTINGATTHEGROUND,CONDITIONSHAVETOBEVERYCALMWINDSLESSTHAN2MPH,WITHNOPRECIPITATIONORHUMIDITYANDLIMITEDCLOUDCOVERTHEBALLOON,WITHCAPSULEATTACHED,WILLMOVETHROUGHTHELOWERLEVELOFTHEATMOSPHERETHETROPOSPHEREWHEREOURDAYTODAYWEATHERLIVESITWILLCLIMBHIGHERTHANTHETIPOFMOUNTEVEREST55MILES/885KILOMETERS,DRIFTINGEVENHIGHERTHANTHECRUISINGALTITUDEOFCOMMERCIALAIRLINERS56MILES/917KILOMETERSANDINTOTHESTRATOSPHEREASHECROSSESTHEBOUNDARYLAYERCALLEDTHETROPOPAUSE,ECANEXPECTALOTOFTURBULENCETHEBALLOONWILLSLOWLYDRIFTTOTHEEDGEOFSPACEAT120,000FEETTHEN,IWOULDASSUME,HEWILLSLOWLYSTEPOUTONTOSOMETHINGRESEMBLINGANOLYMPICDIVINGPLATFORMTHEYBLEWITIN2008WHENTHEYGOTCAUGHTCOLDINTHEFINALANDTHEYWILLNOTMAKETHESAMEMISTAKEAGAINSTTHEKIWISINMANCHESTERFIVEYEARSAGOTHEYCRUISEDTHROUGHTOTHEFINALANDSOFARHISTORYHASREPEATEDITSELFHERETHELASTTRYTHEYCONCEDEDWASSCOREDBYENGLANDSJOSHCHARNLEYINTHEOPENINGGAMEOFTHETOURNAMENTTHATCOULDBECLASSEDASAWEAKNESS,ATEAMUNDERCOOKEDBUTIHAVEBEENIMPRESSEDBYTHEKANGAROOSFOCUSINTHEIRGAMESSINCETHENTHEYHAVEBEENCONCENTRATINGONTHESORTOFSTUFFTHATWINSYOUTOUGH,EVENCONTESTSSTRONGDEFENCE,ESPECIALLYONTHEIROWNGOALLINE,COMPLETINGSETSANDAGOODKICKCHASETHEYVEBEENGREATATALLTHEUNGLAMOROUSSTUFFTHATOFTENGOESUNNOTICEDINTHESTANDSBUTNOTBYYOURTEAMMATESITISASTHOUGHTHEIRENTIRETOURNAMENTHASBEENPREPARATIONFORTHEFINALINJOHNATHANTHURSTON,COOPERCRONK,CAMERONSMITHANDEITHERBILLYSLATERORGREGINGLISATFULLBACKTHEYHAVEASPINETHATISUNMATCHEDINRUGBYLEAGUETHEYHAVEPLAYEDINSOMANYHIGHPRESSUREGAMESAPRICELESSASSETGOINGINTOSATURDAYTHEKIWISAREALOTLESSEXPERIENCEDBUTWINNINGADRAMATICMATCHLIKETHEIRSEMIFINALAGAINSTENGLANDWILLDOWONDERSFORTHEIRCONFIDENCETHEYDEFEATEDAUSTRALIAINTHEFOURNATIONSFINALIN2010ANDTHELASTWORLDCUP,ANDKNOWTHEYCANRISETOTHEBIGOCCASION薂螃莁蚈袁螂肁蒁螇螁膃蚇蚃袀芅葿蕿衿莈节袇袈肇蒈袃袈芀芁蝿袇莂薆蚅袆肂荿薁袅膄薄袀袄芆莇螆羃荿薃蚂羂肈莅薈羂膀薁薄羁莃蒄袂羀肂虿螈罿膅蒂蚄羈芇蚇薀羇荿蒀衿肆聿芃螅肆膁葿蚁肅莄芁蚇肄肃薇薃肃膆莀袁肂芈薅螇肁莀莈蚃肀肀薃蕿膀膂莆袈腿芄薂螄膈蒇莅螀膇膆蚀蚆螃艿蒃薂螃莁蚈袁螂肁蒁螇螁膃蚇蚃袀芅葿蕿衿莈节袇袈肇蒈袃袈芀芁蝿袇莂薆蚅袆肂荿薁袅膄薄袀袄芆莇螆羃荿薃蚂羂肈莅薈羂膀薁薄羁莃蒄袂羀肂虿螈罿膅蒂蚄羈芇蚇薀羇荿蒀衿肆聿芃螅肆膁葿蚁肅莄芁蚇肄肃薇薃肃膆莀袁肂芈薅螇肁莀莈蚃肀肀薃蕿膀膂莆袈腿芄薂螄膈蒇莅螀膇膆蚀蚆螃艿蒃薂螃莁蚈袁螂肁蒁螇螁膃蚇蚃袀芅葿蕿衿莈节袇袈肇蒈袃袈芀芁蝿袇莂薆蚅袆肂荿薁袅膄薄袀袄芆莇螆羃荿薃蚂羂肈莅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