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1、试验算图示焊缝连接的强度。已知作用力F=150kN(静力荷载),手工焊,E43型焊条,wff=160N/mm2。(12分)20.7838424300.8Amm2310.782384275251.26Wmm截面内力:150,33VKNMKNm321501034.9/4300.8FeFNmmA623310119.9/275251.2MfMNmmW故该连接可靠2、如图所示一梁柱的端板连接,钢材为Q235,采用M20C级普通螺栓,该连接所受的偏心力F=150kN,试验算其连接的强度是否满足要求。(2170/btfNmm,17.66edmm)(12分)3805480218080OF解:偏心距e=80mm,核心距:22214801608010160iymmnye,为小偏心2245170416504bbettdNfN…11222150000150000801603000010480160bbttiFFeyNfNNny3、图示简支梁,不计自重,Q235钢,,受压翼缘有做够约束能保证整体稳定,均布荷载设计值为50kN/m,荷载分项系数为1.4,f=215N/mm2。问该梁抗弯强度及刚度是否满足要求。已知:25N/mm1006.2,3845,250][EEIqllx(16分)6000xx-10×150-10×150-8×500解:截面几何特征值:3341150520142500278433333.312xImm31070897.4/2xxIWmmh…截面抗弯强度:取1.05x11.450363158MkNm62231510280.1/295/1.051070897.4xxxMNmmfNmmW,满足要求44555506000113843842.0610278433333.30.068250xqlEI梁刚度不满足要求…1、试设计如图所示角钢与连接板的连接角焊缝。轴心力设计值N=900kN(静力荷载)。钢材Q235,焊条E43系列。(采用三面围焊)(12分)解:由构造要求,定10fhmm…正面角焊缝受力330.720.761251.22160204960wfwffNhlfN肢背焊缝所能承担的内力为:311110.720.7101600.79000.5204.965275202wfwfwNNhlflkNkNN得:1235.5wlmm,取124020260wlmm,满足构造要求肢尖焊缝所能承担的内力为:120.720.7101600.39000.5204.96167520wfwfwNhlflkNkNN得:274.8wlmm,取1752095wlmm,满足构造要求2、钢板截面为310mm20mm,盖板截面为310mm12mm,钢材为Q235,2/215mmNf(16t),2/205mmNf(16t)。8.8级高强度螺栓摩擦型连接20M,孔径22mm,接触面喷砂,=0.45,预拉力kNP125。求该连接的最大承载力?N(12分)解:⑴一个螺栓的抗剪承载力设计值:0.90.920.45125101.25bVfNnPKN连接的抗剪承载力为:11212101.251215bVNNKNKN……………….5分(2)连接板件净截面强度验算:12(10.5)nnNAfn可得:2(310421.5)2020531362051224.510.50.750.75nAfNkN…最大承载力由连接的抗剪控制:max11215NNkN1、(本题12分)试验算图中所示柱牛腿中钢板与柱翼缘节点的连接焊缝的强度(说明验算点)。图中荷载为静力荷载设计值。钢材为Q235-A•F。手工焊,焊条E43型。ffw=160N/mm2,ftw=185N/mm2,fvw=125N/mm2。222222222322323/160/8.959.3022.16.11022.1/6.1107.929.17/7.9225087.02101082067.06/9.3025087.02106.867.0/9.1725087.0210507.010820130502006.86506.86mmNfmmNmmNmmNlhMmmNlhVmmNlhNmmkNMkNNkNVwfffMfNffwfMfwfVfwfNf上边缘点危险3、图示焊接工字钢梁,均布荷载作用在上翼缘,Q235钢,验算该梁的整体稳定。已知:213200mmA,2215mmNf,71.0b,0.1282.007.1'bb,ybyxybbfhtwAh2354.414320212。(可不计梁自重)(16分)180kN/m解:截面几何特征值:943.060210xImm,34.5016cmWx445019392mmIy16000lmm,4501939258.413200yyIimmA,16000102.758.4yyli0b整体稳定系数计算:21223432023514.44320132001220102.7100.711102.75016.4104.412201.020.6ybbbyxytAhwhf'0.2820.2821.071.070.791.02bb………….2分截面最大内力:2261118068101088MqlNmm整体稳定验算:62`381010204.4/0.795016.410bxMNmmfW满足条件1、如图连接,尺寸为mm,受静载拉力150PkN,mmhf10,钢材为Q235BF,E43焊条,手工焊无引弧板,2/160mmNfwf。试验算焊缝强度。(12分)220.710901260Amm34120.7109085050012xImm3850500189004545xxIWmm焊缝截面承受内力:轴心拉力:150NkN1500.011.5MkNm2150000119.05/1260NfNNmmA2150000079.4/18900MfxMNmmW强度验算:2119.0579.4198.451.22140170.8/NMwfffffNmm故该焊缝连接强度不满足要求。2、下图所示某钢板的搭接连接,采用c级普通螺栓M22,孔径0d=23.5mm,承受轴心拉力400NkN,钢材Q235,试验算此连接是否可靠。(2140/bvfNmm2305/bcfNmm)(12分)解:⑴一个螺栓的抗剪承载力设计值:22343.1422214010106.384bbVVvdNnfkN⑵一个螺栓的承压承载力设计值320163051097.6bbccNdtfkN…⑶最大承载力min897.6780.8400bNnNkNkN…⑷净截面强度验算:11240223.51630885087.22323.5163638.4AA3322min683.21040010129.5/215/(310421.5)143088nNNmmfNmmA满足要10P10110P10A3、一工字形截面梁绕强轴受力,截面尺寸如图,当梁某一截面所受弯矩M=400kN·m、剪力V=580kN时,试验算梁在该截面处的强度是否满足要求。已知钢材为Q235B,f=215N/mm2,fv=125N/mm2。(16分解:4645233333.3mmxI213000mmA3645233333.32389753.1270xWmm421352500mm1040000S62140010159.4/2151.052389753.1xWMNmmf…221500147.6/540Nmm32258010104000093.5/645233333.310Nmm折算应力计算:2222223147.6392.5217.841.1215236.5f强度满足要求2.(本题12分)试验算图示节点摩擦型高强螺栓群的强度。图中荷载为静力荷载设计值,高强螺栓为8.8级M20,预拉力P=110KN,被连接板件钢材Q235-A•F(Vdf=125N/mm2,df=215N/mm2),板件摩擦面间作喷砂处理(μ=0.45)。223223/2011//215/9.722001210175/215/66.6918841025.1311884125.2122001225.131175)425.01()5.01(75.434175455.4411045.019.09.0mmNfmmNANmmNfmmNANmmtdnAAkNNnnNNkNNNkNPnNnnbVVfbV毛截面强度:净截面强度:3.(本题16分)某简支梁截面如图所示,梁的跨度为6m,荷载为静力荷载设计值,试验算梁的强度是否满足要求。判定梁的局部稳定是否满足要求(腹板判定是否需设加劲肋,如需设加劲肋,请按构造要求设置加劲肋,并画出加劲肋的布置图)。梁采用Q235-A钢材,fd=215N/mm2,fvd=125N/mm2,fy=235N/mm2。计算时可忽略梁的自重。验算图示承受静力荷载的连接中脚焊缝的强度。2/160mmNfwf,其他条件如图所示。无引弧板。(12分)解:kNVkNmM180362.01802262/9.1628236087.02103667.026mmNLhMwff23/72.468236087.02101807.02mmNLhVwff222222/160/5.14172.46)22.1/9.162()22.1/(mmNfmmNwfff该连接安全可靠1.某双盖板高强度螺栓摩擦型连接如图所示。构件材料为Q345钢,螺栓采用M20,强度等级为8.8级,接触面喷砂处理。试确定此连接所能承受的最大拉力N。(预拉力P=125Kn,摩擦系数为0.5,钢材强度设计指标f=295N/mm2)(12分)解:一个螺栓的抗剪承载力:0.9112.5bvfNnPKN故112.5bvNnNKN(2分)净截面验算:2012332222102cm...dnbtAn。ha,thfmmNfmmNmmNtIVSmmNhhmmNfmmNtIVSmmNfmmNWMmmSSmmSmmWmmIkNVmkNMwydeqwxVdwxdxxxx力处均设横向加劲肋,其中支座及跨中集中取且向加劲肋故需按构造要求设置横因为120027580068023580/5.2361.1/2.1112.7131.0713/2.7181032.510443.710100/1.07124600693.111/125/7.5281032.51049.1010100/215/93.1111071.105.1102001049.10150803010443.7306122001071.12311032.51032.56301220025008121100200002222212128531120max122853maxmax2266max351max3513684823
本文标题:钢结构考试计算题
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