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1、.鋼結(jié)構(gòu)課程設(shè)計(jì)-、設(shè)計(jì)資料1、已知條件:梯形鋼屋架跨度33m,長(zhǎng)度120m,柱距6m。屋架鉸接于混凝土柱上,屋面采用單層彩色鋼板波形瓦,屋面坡度i=1/10。屋面活荷載標(biāo)準(zhǔn)值為0.7kN/m2,屋架鉸支在鋼筋混凝土柱上,上柱截面為400mm×400mm,混凝土標(biāo)號(hào)為C20。鋼材采用Q345B級(jí),焊條采用E50型。2、屋架計(jì)算跨度:Lo=33-2×0.15=32.7m,3、跨中及端部高度:端部高度:h`=1900mm(軸線處),h=1915mm(計(jì)算跨度處)。屋架的中間高度h=3400mm,屋架跨中起拱按Lo/500考慮,取60mm。二、結(jié)構(gòu)形式與布置屋架形式及幾何尺寸見圖1所示
2、,支撐布置見圖2所示。圖1屋架形式及幾何尺寸....符號(hào)說明:GWJ-(鋼屋架);SC-(上弦支撐):XC-(下弦支撐);CC-(垂直支撐);GG-(剛性系桿);LG-(柔性系桿)圖2屋架支撐布置圖三、荷載與內(nèi)力計(jì)算1.荷載計(jì)算荷載與雪荷載不會(huì)同時(shí)出現(xiàn),故取兩者較大的活荷載計(jì)算。永久荷載標(biāo)準(zhǔn)值鋼屋架和支撐自重0.12+0.011×30=0.45kN/㎡單層彩色鋼板波形瓦0.12kN/㎡總計(jì)0.57kN/㎡`可變荷載標(biāo)準(zhǔn)值屋面活荷載0.70kN/㎡總計(jì)0.7kN/㎡永久荷載設(shè)計(jì)值1.2×0.57=0.684kN/㎡可變荷載設(shè)計(jì)值1.4×0.7=0.98kN/㎡2.荷載組合設(shè)計(jì)屋架時(shí)
3、,應(yīng)考慮以下三種組合:①全跨永久荷載+全跨可變荷載全跨節(jié)點(diǎn)永久荷載及可變荷載:F=(0.684+0.98)×1.5×6=14.97kN②全跨永久荷載+半跨可變荷載全跨節(jié)點(diǎn)永久荷載:F1=0.684×1.5×6=6.156kN半跨節(jié)點(diǎn)可變荷載:F2=0.98×1.5×6=8.82kN....③全跨屋架及支撐自重+屋面板重+半跨屋面活荷載全跨節(jié)點(diǎn)屋架及支撐自重:F3=0.45×1.2×1.5×6=4.86kN半跨大型屋面板重及活荷載:F4=(1.4×0.12+0.7×1.4)×1.5×6=10.33kN3.內(nèi)力計(jì)算本設(shè)計(jì)采用程序計(jì)算桿件在單位節(jié)點(diǎn)力作用下各桿件的內(nèi)力系數(shù),見表1。桿件
4、名稱內(nèi)力系數(shù)(F=1)第一種組合F*①第二種組合第三種組合計(jì)算桿件內(nèi)力(KN)全跨①左半跨①右半跨②F1*①+F2*②F1*①+F2*③F3*①+F4*②F3*①+F4*③上弦AB00-0.010.000.00-0.160.00-0.26-0.26BCCD-11.35-8.49-3.45-631.39-584.54-501.99-281.38-151.20-631.39DEEF-18.19-13.08-6.25-1011.89-928.19-816.31-437.36-260.94-1011.89FGGH-21.53-14.62-8.46-1197.69-1084.51-983.
5、61-495.40-336.29-1197.69HJ-22.36-13.98-10.25-1243.86-1106.60-1045.50-483.41-387.07-1243.86IJJK-22.73-14.3910.2-1264.45-1127.84-725.05-496.03139.13-1264.45下弦ab6.334.941.83352.13329.36278.42162.2381.89352.63bc15.3611.34.98854.46787.96684.44375.90212.65854.46cd20.2114.147.431124.261024.84914.934
6、75.78302.471124.26de22.1214.449.391230.511104.721022.00493.98363.541230.51ef21.2311.6811.681181.001024.571024.57417.82417.821181.00斜腹桿aB-11.34-8.66-3.27-630.83-586.93-498.65-285.72-146.49-630.83Bb8.816.472.87490.09451.76392.79215.31122.32490.09bD-7.55-5.23-2.84-420.00-382.00-342.85-176.39-114
7、.66-420.00Dc5.393.392.44299.84267.08251.52117.0592.51299.84cF-4.23-2.25-2.43-235.31-202.88-205.83-81.26-85.91-235.31Fd2.620.882.13145.75117.25137.7237.0669.35145.75dH-1.510.22-2.12-84.00-55.66-93.99-2.58-63.02-93.99He0.29-1.251.8916.13-9.0942