鋼結(jié)構(gòu)課程設(shè)計(jì)班號(hào)：學(xué)號(hào)：1一．設(shè)計(jì)資料160061666Nk52.703-桿件軸線長(zhǎng)度(mm)．。．．。．62222．．C度二．荷載計(jì)算222262222222．PPPPPPPPPPPPP/2581012850300030003000300030003000285023700PPPPPPP12PP12PP12P12PP/211212112581013000300030002850(b)Fig.02屋架計(jì)算簡(jiǎn)圖）Fig.02）Fig.02PP12）P1P2．四．桿件截面選擇表13．節(jié)點(diǎn)板厚最大腹桿內(nèi)力N=-307.382,查表7-6t=10mmt=12mm2．上弦桿采用一種桿截面，按上弦桿FGGH的最大內(nèi)力設(shè)計(jì)N=-594.785KN計(jì)算長(zhǎng)度：llcmoxll4150.8603.2cmoy截面選擇：選用不等邊角鋼，短邊相連設(shè)80，查附表2-5。Nf0.688截面特性：A3716.77cm22150.8l603.2lixiy7.54oyλ）0）1212000400根據(jù)需要的Aii查型鋼表選用×90×10短邊相連xy截面特性：A=44.522cm,i=2.56cm,i=6.77cm2xy150.82.56l603.26.77l58.9189.10oyoxiixyxy由=89.10附表2-5，φ=0.628λxNA（符合要2196.6N/fN/22求）3.下弦桿下弦桿采用同一截面，按下弦桿gi的最大內(nèi)力計(jì)算。計(jì)算內(nèi)力：N=544.735KN計(jì)算長(zhǎng)度：ll,loxoyN544.735截面選擇：A=25.34cm2f根據(jù)需要的Aii查型鋼表選用×80×8短邊相連xyA=31.978cm,i=2.28cm,i=6.07cm2xy300l截面驗(yàn)算：144.93350oxi2.28xxl30098.85oyi6.07yyN170.35N/fN/222A1．端斜桿aB計(jì)算內(nèi)力：N=-307.382KN=-307382N計(jì)算長(zhǎng)度：lloxoy選用×80×8長(zhǎng)邊相接5A=27.888cm,i=2.37cm,i=4.74cm2xy237.22.37l100.08150oxixxl4.7450.04oyiyy查附表2——5，N198.59N/fN2/2A27.88825.腹桿Bc計(jì)算內(nèi)力：N=236.007KN計(jì)算長(zhǎng)度：ll,lloxoyN截面選擇：A=1097.7cm22f根據(jù)需要的Aii查型鋼表選用×5xyA=12.286cm,i=1.94cm,i=2.96cm2xy196.81.94l截面驗(yàn)算：101.4435083.11oxixxloyi246λ2.96yyNσ/N/N2f2A1228.66．腹桿Hi計(jì)算內(nèi)力：－59.15KN計(jì)算長(zhǎng)度：lloxoy80,，NA3.99920.688215102f6選用×6,A17.594cm2i2.31i,,xyl322.12.31139.44[]1500xixxl322.13.4693.090yiyy139.44,N96.33N/fN2/2A0.34917.5942表2σ名yλλφφ2)xxxy有52有785××28885464腹469464桿4761455564242004五節(jié)點(diǎn)設(shè)計(jì)”””””Fig.02IHGFEDCBAacegiFig.03需要設(shè)計(jì)的節(jié)點(diǎn)1下弦桿節(jié)點(diǎn)“”．8Nk76.33-Nk6213.64.8007kN521751751601Fig.04下弦節(jié)點(diǎn)“”(1)Bc桿焊縫計(jì)算N=236.007KN角焊縫強(qiáng)度設(shè)計(jì)值f=160N/mmh=6mmw2ff長(zhǎng)度：0.7N2hf0.7236007肢背：l122.9,135mm52.68,取65mm'20.76160wwef0.3N0.3236007肢尖：l'2hf20.76160wwef（2）Cc桿焊縫計(jì)算N=-33.667KNh=6mmf0.7N0.733.667肢背：l17.5,根據(jù)構(gòu)造要求取40mm7.5,根據(jù)構(gòu)造要求取40mm'2hf20.76160wwef0.3N0.333.667肢尖：l'2hf20.76160wwef（3）cD桿焊縫計(jì)算N=-184.160KNh=6mmf0.7N0.7184226肢背：l95.9,110mm,55mm'2hf20.76160wwef0.3N0.3184226肢尖：l'2hf20.76160wwef9(4)下弦桿焊縫驗(yàn)算下弦桿與節(jié)點(diǎn)板連接焊縫承受兩相鄰內(nèi)力之差：△N=420.84-174.733=246.107KN根據(jù)節(jié)點(diǎn)放樣，得節(jié)點(diǎn)板尺寸為×300mm肢背焊逢驗(yàn)算：設(shè)h6mmfN0.7564.6N/mmf160/mm2w220.7hl20.7610)fffw．上弦桿節(jié)點(diǎn)“”16010666Nk52.703-Fig.05上弦節(jié)點(diǎn)“B”(1)aB桿焊縫計(jì)算N=-307.382KNh=6mmf100.65N0.65307.382肢背：l149,170mm80,100mm'2hf20.76160wwef0.35N0.35307.382肢尖：l'2hf20.76160wwef上弦桿焊縫驗(yàn)算h=6mmf尺寸為350×500mm△（-320.175）=320.175KNN32017577.79/NmmNf22hl20.76490ew6M63201755552.39N/mm2M2hl220.764902few252.39Mf77.79()88.86/Nmm160/2NmmfNf1.22222w21.22ff3．屋脊節(jié)點(diǎn)“”6666Nk473.17Nk473.17Nk473.17Nk473.17Fig.06屋脊節(jié)點(diǎn)“I”11上弦桿節(jié)點(diǎn)拼接計(jì)算度：△=t+h+5mm=10+6+5=21mm，拼接接頭一側(cè)的連接焊縫長(zhǎng)度按上弦桿f內(nèi)力計(jì)算，設(shè)焊縫h=6mmfN528.575肢背：l196.6mm40.7hf40.76wwff取拼接角鋼長(zhǎng)度：L800mml453.2mmw（2）上弦桿與節(jié)點(diǎn)板連接焊縫計(jì)算上弦桿與節(jié)點(diǎn)板之間槽焊承受節(jié)點(diǎn)荷載，強(qiáng)度足夠，計(jì)算略。上弦桿肢尖與節(jié)點(diǎn)板之間連接焊逢，按上弦桿內(nèi)力15%計(jì)算設(shè)h=6mm，節(jié)點(diǎn)板尺寸為×，節(jié)點(diǎn)一側(cè)焊縫：fh1702焊縫應(yīng)力驗(yàn)算：f0.15N0.15528.57520.7655.52N/mm2nf20.7hlfw0.15Ne60.15528575556107.78N/mm2M20.7hl20.762N2fw2107.782M55.52104.34N/mmfNmm2/222nfNw1.221.22ff4.跨中下弦拼接點(diǎn)“i”12N-k5291.88.1925k-N66666573652062502502Fig.07跨中下弦拼接節(jié)點(diǎn)“i”（1）上弦桿拼接計(jì)算度：△=t+h+5mm=10+6+5=21mm，拼接接頭一側(cè)的連接焊縫長(zhǎng)度按下弦等f(wàn)強(qiáng)度計(jì)算，設(shè)焊縫h=6mm，每條焊縫所需長(zhǎng)度為：fAf31.978lw255.78mm40.7hf40.76wff取拼接角鋼長(zhǎng)度：L800mml551.6mmw設(shè)h=6mm，節(jié)點(diǎn)板尺寸為×，節(jié)點(diǎn)一側(cè)焊縫：fh2202f0.15N0.15544.73544.22/Nmmnf220.7hl20.76220fw0.15Ne60.15544.735556Nmm66.32/M220.7hl20.76(220)2N2fw266.322M44.2270.07N/mmfNmm160/2222nfNw1.221.22ff135.支座節(jié)點(diǎn)“”Nk438.61-Nk52.703-6660174.733kN6602801456045456045300150642314414412300Fig.08支座節(jié)點(diǎn)“”（1）支座底板計(jì)算支座反力：R=10P=10×33.667=336.672KNR336672所需底板凈面積：A35439mm2f9.5nc設(shè)底板尺寸為300×，底板錨栓孔徑為60mm，14(60)2底板平面凈面積：A300224nR336672底板下平均應(yīng)力為：3.9KN/mm2A84345.13n底板為兩相鄰邊支撐板，單位寬度彎矩為Ma212a21300mm2ba/2mm11b1由0.5，查表4得0.058a1M0.0582(10175.9Nmm26M610175.9:t16.9mm,取t20mmf（2）加勁肋與節(jié)點(diǎn)板的連接焊縫計(jì)算5070MV151056753Fig.09加筋肋計(jì)算簡(jiǎn)圖15設(shè)一個(gè)加勁肋承受1/4屋架支座反力，即NR84168N441焊縫內(nèi)力為:VN84168NMNe84168675639256Nmm11設(shè)焊縫h6，焊縫計(jì)算長(zhǎng)度：l3401510315mm焊縫應(yīng)力檢算：fw