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电大混凝土结构设计原理期末复习计算题考试资料小抄1.已知钢筋混凝土矩形截面梁,采用20号混凝土R-llMPa和Ⅱ级钢筋Rg=
1.解1计算混凝土受压区高度z由则有效高度由得1.钢筋混凝土梁截面尺寸6—200ram,h=450ram,混凝土C30,钢筋采用HRB335级,环境类别为一类梁承担的弯矩设计值受拉钢筋较多,需布置两排,取,求所需的纵向受力钢筋的值已知解解1计算受压钢筋为使总用钢量最小,取2计算受拉钢筋2.钢筋混凝土矩形截面简支梁,截面尺寸为混凝土强度等级为C25,箍筋为HRB335仅配箍筋试求出该梁斜截面所能承受的均布荷载设计值q已知解1计算简支梁所能承担的剪力2该梁斜截面所能承受的均布荷载设计值q则1.已知钢筋混凝土矩形截面梁,采用25号混凝土和Ⅱ级钢筋1承受计算弯矩,选用梁断面为,试用基本公式求所需的钢筋面积A9.提示解1计算混凝土受压区高度z由则有效高度由得大于梁高,舍解方程得2计算受拉钢筋截面面积Ag由2.轴心受压构件截面尺寸,计算长度采用30号混凝土,纵向钢筋采用Ⅱ级钢筋,箍筋采用I钢筋,作用轴向设计压力试求纵向受压钢筋;工作条件系数;混凝土安全系数提示解1计算钢筋混凝土构件的纵向弯曲系数计算,查表得2计算纵筋面积3配筋率验算可以故受压纵筋最小配筋率,满足要求1.已知钢筋混凝土矩形截面梁,承受计算弯矩采用20号混凝土},Ⅱ级钢筋.梁截面尺寸求钢筋面积已知且解2.轴心受压构件截面尺寸,计算长度,采用30号混凝土,纵向钢筋采用ll级钢筋,箍筋采用l钢筋,作用轴向设计压力试求纵向受压钢筋工作条件系数混凝土安全系数解1.已知钢筋混凝土矩形截面梁,采用25号混凝土和Ⅱ级钢筋340MPa承受计算弯矩选用梁断面为试用基本公式求所需的钢筋面积已知且分解1计算混凝土受压区高度2由则有效高度由得解方程得分2计算受拉钢筋截面面积由分2.轴心受压构件截面尺寸计算长度采用30号混凝土,纵向钢筋采用Ⅱ级钢筋,箍筋采用I钢筋,作用轴向设计压力试求纵向受压钢筋工作条件系数混凝土安全系数分解1计算钢筋混凝土构件的纵向弯曲系数够计算查表得2计算纵筋面积3分分3配筋率验算可以故受压纵筋最小配筋率,满足要求2分1.已知钢筋混凝土矩形截面梁,采用20号混凝土R一llMPa和Ⅱ级钢筋R9一340MPa承受计算弯矩Mi--90kN·In,选用梁截面为20cmX50cm试用基本公式求所需的钢筋面积Ag设a=40mm,毛=0.55,7一丫一1.25,p;=0.10%1.解1计算混凝土受压区高度X由a=40mm则有效高度ho=500--40=460mm由得解方程2计算受拉钢筋截面面积Ag由AgRg=R6z2.一连接的构造如图所示,两块A板用对接焊缝与立柱焊连,8板与A板用8个高强螺栓连接构件钢材为A3钢,其容许应力为[d]一140MPa,o]一145MPa,[r]一85MPa设对接焊缝的强度与母材相同,不设引弧板试求焊缝连接所能承受的荷载P2.解扣除两端的缺陷,焊缝的有效截面如右图所示
①受力分析剪力Q—PkN
②焊缝的有效截面
③求P由得由得故焊缝所能承受的荷载请删除O∩_∩O谢谢ForeignersflocktoChinasporcelaincapitalPreservingtheancienttraditionsForeignersflocktoChinasporcelaincapitalJingdezhenraisesporcelainstandardCityslonghistoryoffineceramicsluresfollowersfromacrosstheworldreportPengYiningandHuKaiyonginJingdezhenJiangxiprovince.Dressedinpaint-stainedcoverallsChinaDeLaVegaeasilynavigatedthemazeofalleywaysrunningalongsideaceramicsfactoryinJingdezhenJiangxiprovince.The31-year-oldAustralianpotterandpainterwoundherwaythrougharmiesofone-meter-highceramicBuddhasandpilesofporcelainshardswhilenoddinggreetingstotheworkersandresidents.ShesaidthelocalsareusedtoseeingforeignersinJingdezhenChinasporcelaincapitalwherefineceramicshavebeenproducedformorethan1700yearsattractingnumerousporcelainpilgrimsfromacrosstheglobe.UnlikehugeChinesemetropolisessuchasBeijingandShanghaiJingdezhenisaprefecture-levelcitywithnobarstreetsorinternationalstoresthatarepopularamongexpatriates.ButdespiteitslackofWesternchainstoresJingdezhenisoneofthemostinternationalcitiesininlandChinawithceramicstudiosownedbyforeignersdottingthestreetsthesurroundingcountrysideandevenremotemountaintops.Whenshefirstvisitedthecityin2011DeLaVegawasimpressedbythediscardedpiecesofporcelainshefoundlyingaround.Idugoutmanypiecesfromthesoilaroundtheceramicsworks-alltheoldBuddhaheadshandsandfeetwhichIrebuiltintonewsculpturesandusedinmynextexhibitioninAustraliashesaid.Ilovethisplacebecausetheprocessofmakingceramicsisaverypeacefulone.Visa-freepolicybringsChengdubiztourismboost.MakingnationalheadlinesseveraltimesChengdus72-hourvisa-freepolicyhasattractedwideattentionfrombothChineseandforeignexpertsandbusinessmensinceittookeffectonSept1lastyear.Theprogrampermitscitizensfrom51countriesandregionsincludingtheUnitedStatesAustraliaCanadaandJapanwhohavevalidvisasandflightticketstoathirdcountrytospendthreedaysinthecity.ThecapitalofSichuanprovinceisthefirstcityinthewesternregionofChinatoofferforeigntouristsathree-dayvisaandthefourthnationwidetoadoptthepolicyfollowingShanghaiBeijingandGuangzhou.LiZhiyongdeputydeanofthetourisminstituteatSichuanUniversitysaidthemovecontributestoalargeincreaseinthenumberofoverseastouristsandraisesthecityslevelofinternationalization.ThepolicywillalsobringdirecteconomicrevenueLisaid.Chengduhasmanyculturallegaciesandisalsoaparadiseforpandaloverswiththeworldslargestbreedingandresearchcenter.Threedaysarelongenoughforforeignvisitorstovisitthoseiconictouristspotshenoted.ThecityishometotheremainsoftheJinshacivilizationthatdatesbackmorethan3000yearsaswellastheQingchengMountainsandtheDujiangyanirrigationsystem.QingchenghaslongbeenrecognizedasthebirthplaceofTaoismChinasancientindigenousreligionwhileDujiangyanisconsideredtobetheoldestfunctioningwater-controlprojectintheworld.Chengdurankedthirdintouristfacilitiesmanagementandservicesamong60Chinesecitiesinacustomersatisfactionsurveyreleasedlastyear.ButLiaddedthateffortsarestillneededtodevelopmoretourismproductsimproveEnglishservicesandprovideaccuratetranslationoftrafficsignsandscenicbillboards.ZhaoYunchairwomanofBritishChamberofCommerceSouthwestChinatoldChinaDailythathiscolleaguesfoundthepolicyveryconvenient.ABritishclientonceflewhereandstayedforjustonedaytocheckherorderedgoodsshesaid.ZhaowasborninShanxiprovincebutshehaslivedinChengduformorethan10years.Mylifewaslikearunningracemovingfromplacetoplace.IalsolivedinBeijingandShanghaibeforeshesaid.ButChengduisaplacethatyouneverwanttoleaveoncesettlingdown.Itisnowmysecondhometownshesaid.Iftheenvironmentisfurtherimprovedthecitywillattractmorepeopletovisitandlivewiththe72-hourvisa-freepolicyandcompellingconditionsintransportationcultureclimateandcuisinehesaid.Foreignersalsogavepositivefeedbackonthepolicy.AspokesmanfromDellIncsaidthecompanyhasaglobalhubofoperationinChengdusothethree-dayvisahasanimmediateandpositiveinfluenceonthecompanysbusinessdevelopment.RudyButtignolpresidentofthepublicbroadcastingcompanyinBritishColumbiaCanadasaidhisworkrequiresfrequenttraveltoChengduandthepolicymakesthetripseasier.Datafromthecityspublicsecuritybureaushowssome100foreignvisitorsenjoyedthe72-hourpolicybytheendofMarchmostofthemfromtheUnitedStatestheUnitedKingdomandGermany.Chengdualsoreportedrobustgrowthinitsoveralltouristindustrylastyear.Officialstatisticsshowthatitreceivedsome150milliontouristslastyearanincreaseof28percentfrom
2012.Around
1.7millioncamefromabroadanincreaseof12percent.Totalrevenuefromtourismsurpassed133billionyuan$
21.7billion.DuringhisvisittoKazakhstaninSeptemberChinesePresidentXiJinpingproposedthatChinaandCentralAsiajoinhandstobuildaSilkRoadeconomicbelttoboostcooperation.TheideahasbeenwidelyechoedinCentralAsiancountriesbecominganencouragingblueprintforChineseareasalongtheSilkRoadthathaslinkedAsiaandEuropeformorethan2000years.InthenextthreeweeksChinaDailyreporterswilltravelthroughthebeltinChinaandinKazakhstanUzbekistanandTurkey.Theywillshowtheprogressandexpectationsofthecountriesbusinessesandpeoplesontheroute.Shaanxi-thestartoftheancientSilkRoad-haspositioneditselfasthenewstartingpointforthedevelopmentoftheSilkRoadEconomicBeltwhichwillstrengthenChinascooperationwithCentralAsiancountriesaseniorofficialsaid.ShaanxiGovernorLouQinjiansaidtheprovinceisfreshrichanduniqueasitwaswhenitanchoredoneendoftheancientSilkRoad.ItisthebestoptionforaccommodatingindustrialtransfersfromEastChinaortheworldatlargehesaidonWednesdayinXian.Louheldajointinterviewwith27mediaincludingChinaDailythefirstinaseriesofinterviewsentitledChineseMediaAlongtheSilkRoad.TheinterviewswillbeinShaanxiandGansuprovincesandtheXinjiangUygurautonomousregionaswellasKazakhstanUzbekistanandTurkey.ThemediagroupheldthefirstinterviewonWednesdaymorninginXianthestartingpointoftheancientSilkRoadatradechannelestablishedmorethan2000yearsagolinkingChinaCentralAsiaandEurope.Thepursuitofbeautyisacommongoal formostwomenwhethertheyliveinthemodernworldtodayorinthemodesttimesofthepast.Thepursuitofbeautyisalsoalife-longjourneysomethingthatdemandspe rseveranceandcommitment.Summerishereandsoarethe hottemperatureshumid airandharmfulUVrays.MostChinesewomenperferfairercomplexionswhichmeanstheyhavetodomoreworktostaybeautifulduringthehottesttime oftheyear.HoweverwithoutSPF50sunscreensandairconditionedroomshowdid womeninancientChina copewiththeheatandremainbeauty-conscious Inthisarticleyoulldiscoverthatasidefromtodaysbotoxandfaceliftsthere aremuchmorethatancientwisdomhastooffer.。