【精品】梯形钢屋架课程设计指导书

梯形钢屋架课程设计指导书结构。1.1屋盖结构体系1、无檩设计方案和防水层。这种方案最突出的优点是屋盖的横向刚度大，整体性好，所以大，屋盖结构自重大，抗震性能较差。2、有檩设计方案1/宜采用有檩设计方案。1.2屋盖支撑种体系在垂直于屋架平面的侧向（即屋架平面外）的刚度和稳定性很差，为一个稳定而刚强的整体结构。屋盖支撑的作用主要是：1、保证桁架结构的空间几何形状不变。平面桁架能保证桁架平面内的几何稳定性，支撑系统则保证桁架平面外的几何稳定性。2、保证桁架结构的空间刚度和空间整体性。3、为桁架弦杆提供必要的侧向支承点。4、承受并传递水平荷载。2/5、保证结构安装时的稳定和方便。1.3屋架的形式和主要尺寸1、屋架形式的确定应满足经济、适用和制造安装方便的原则3/（1）满足使用要求。钢丝网水泥槽板时，屋架上弦坡度应做的陡些，一般取1/5～1/2，以利排水；当采用大型屋面板上铺卷材防水屋面时，则要求屋面坡度平缓些，一般取1/12～1/8。（2）满足经济要求。使短杆受压，长杆受拉，且杆件数以少为宜。总长度要短，杆件夹角宜在能避免非节点荷载作用，以免弦杆局部受弯而多耗钢材。（3）满足制造，安装和运输要求。2/现场安装。等因素，经综合分析，才能最后选定。2、普通钢屋架的形式（1）三角形钢屋架三角形屋架用于陡坡屋面的屋盖结构中。三角形屋架的共同缺点是：屋架外形和荷载引起的弯矩图形不相适应，因而弦杆内力分布很不均匀，使构造比较困难。（2）梯形钢屋架3/架中的腹杆体系：可采用人字式、再分式和单斜杆式。（3）平行弦钢屋架4/水平式平行弦屋架多用做托架。（4）人字形钢屋架屋架一般宜采用上承式，即支座节点在上弦节点。3、屋架的主要尺寸（1）跨度柱网纵向轴线的间距就是屋架的标志跨度，以3m为模数。屋架的计算跨度是屋架两端支反力之间的距离。（2）高度3/限，例如铁路运输界限为3．85m；屋架的经济高度是根据上下弦杆和腹加以某种限制。部高度，再按照屋面坡度计算跨中高度。对于三角形屋架，；陡h00h0坡梯形屋架可取h0.5~1.0m；缓坡梯形屋架取h1.8~2.1m。因此，00跨中屋架高度为hhil/2式中i是屋架上弦杆的坡度。00一般屋架高度可在下列范围内采用：梯形和平行弦屋架h1/10~1/6l0三角形屋架h1/6~1/4l01/10~1/8lh0或或4/5/g0.12lkN/ml2kgkq，kq/cos，k较小，可按cos1PqasPkkkqkas4/llll或xyyoxx5/l，lxyl，loxoy是，，xyxyT6/TTTTiiTi为li过7/8/①8/1、和lll123图1下弦一般节点9/NNlw2l1220.7hff120.7hff21wwffNNNhf2h1220.7lf120.7lfw2f1wwffNfwfh、hf1f2、ll1w22h；f2313、，。1212N2PNNeMNe。当屋面坡度较缓时，角钢肢背槽焊缝的强度可按下式计算：P0.8fw20.7hlfff110.5th（tf/f1.22f1.0。fNN在在20.7hlff2w26MMNe作用下，20.7hlf2f2w22ff2wfff图2上弦一般节点/3/4Nlwl2hl40.7hfwfwffl2l弦杆杆端空隙lss图3屋脊拼接节点PP0.8fw20.7hlfff11M0.15Ne0.15N在在作用下，N0.15Nf20.7hlf2w26MM0.15NeMf20.7hl2f2w2/2MffwNfff1.22f1.0。f44，ht5f4Af，A图4下弦拼接节点Afl2hllw40.7hfwwfffll10~20mm，10~20mmlss/0.15N,Nl1120.7hfwf1fll2h11f10.15N,Nlw2220.7hfwf2fll2h2w2f25R：A锚栓孔缺口面积AfcRfc/图5梯形屋架支座节点图6两邻边支承的矩形板6MtfM；Mqa21q6ab161b/a111/。MRRMe4焊缝受剪力：V422Vefwf20.7hl20.7hl2fwfwfhlfwRfwflwf0.7hlffw6，和tl2a22bt2c62hc1w1f度/桁架上弦支撑布置图/桁架下弦支撑布置图垂直支撑1-1垂直支撑2-2SC－上弦支撑；XC－下弦支撑；CC－垂直支撑；GG－刚性系杆；LG－柔性系杆梯形钢屋架支撑布置/梯形钢屋架课程设计实例C,7imm。22l27m20.15m26.7mh3.141m(为l/8.0)h'2.297mh2.302mL/500图2.12梯形钢屋架形式和几何尺寸/桁架上弦支撑布置图桁架下弦支撑布置图/垂直支撑1-1垂直支撑2-2SC－上弦支撑；XC－下弦支撑；CC－垂直支撑；GG－刚性系杆；LG－柔性系杆图2.13梯形钢屋架支撑布置2.3.2荷载计算m2屋架沿水平投影面积分布的自重（包括支撑）按经验公式0.12m0.011跨度（Pw表2.2荷载计算表m）2m）20.120.01130/）1.5F））F4.3611.539.249kN11.821.5＝16.38kNF2F0.6081.55.47kN3F1.890.71.523.31kN4/图2.14屋架计算简图表2.3屋架杆件内力组合表FFFF×①计算杆件内杆件名称1133力/kNFFFF2244-0.16AB-0.23-501.99-816.31-983.61-1045.50-1059.21BC、CD-11.35-8.49-3.45-259.99-142.50-631.39-404.39-245.19-1011.89-458.56-314.97-1197.69-448.18-361.24-1243.86-459.76-362.10-1264.45abbccdde1.834.987.439.39278.42684.44914.931022.00147.45347.42440.15457.5977.28200.10283.74339.88352.13854.4615.3611.3020.2114.1422.1214.441124.261230.511024.841104.721124.261230.51/21.2311.6811.681181.00-630.83490.09-420.00299.84-235.31145.75-93.9945.64-11.34-8.66-3.27-498.65-263.89-138.25392.79199.01115.09-342.85-163.21-107.508.81-7.55-5.23-2.845.393.392.44-4.23-2.25-2.430.880.22-1.253.404.070.54-27.55115.74-44.78151.44-42.2628.0822.7046.7818.25-0.55-0.54000000-30.60-55.63-54.52-47.28-78.991.12-30.43-55.47-54.52-48.10-79.160.78-21.59-39.25-38.46-33.36-55.730.78-15.60-28.55-28.20-25.63-41.100.11-3.01-5.47-5.36-4.65-7.770.11-30.60-55.63-54.52-48.10-79.161.12GdJgIeKf-0.98-0.98-0.85-0.90-1.42-1.430.020ll1.508m0x0l0yl31.5084.524m0y/图600.807T设bN103A7287.72fl0yl0x1.508ixmmm，im75.460y、iixy2，i，mm30.8mmi88.0mmxyl0yil0xi452488.051.41xyxy>yxyyN1264.65103A0.847Mpa191.59Mpa215Mpa7793y/图2.15上弦截面N1230.51kN1230510Nl3000mm，l29700214850mm0x0yNA5723.30选用××，因22fll0y0x2cm2,i3.10cm,i8.74cmxy图2.16下弦截面l0yil0xi1485169.913508.74xyxy/630.83kN630830NNl2534mm0yl0xliil0x0yxycm2,i4.47cm,i3.74cmxyl0yil0xi253.43.7467.78xyxy0.764因>，只需求，查表得yxyyN630.83103185.46Mpa215MpaA0.7644452.2yg151.44kNN115.74kNNN,gKeg44.78kNN42.26kN,eggK2301mml，0xNll))2L63×2N0y11cm2,i1.94cm,i3.04cmxyl0xixx/l0yi453.733.04149.25150yy0.310因>，只需求，查表得yxyyN44.78103117.54Mpa215Mpa拉应力：A0.3101228.6yN103123.26215Al0.8l0.8319.1255.2cm，llcm0x0xll319.10150ix1.70icmcm0xyi和ii和ixyxy1.94cmi3.04cmcm2,i,xyl0yil0xi319.13.04104.97150xyxy0.38因>，查表得xyxxN169.56215Ax/bh和llfww用f。wf8mm6mm设“Bb”杆的肢背和肢尖焊缝hfN2hf191.44l'28wwef0.3N2hfl109.426wwef8mm6mmhfN2hf164.06l'93.7528wwef0.3N2hfl26wwef5mmh。f6mmhf/N854.46352.13kNf2103.581606/表2.4屋架杆件截面选择表名称内力/kNlliiyx上弦下弦腹杆-1264.45-30.60-630.83490.09-55.63-420.00299.84-55.63-235.31145.75-54.52-93.9945.61-27.55-79.16115.74-44.78151.44-42.26/1.12gIJg165.9127.6207.4158.950×550×59.6069.6061.531.532.532.53-48.10/（）图2.17下弦节点“b”N630.83kN，aB10mm和6mmhfN183.05l'164.282hfe2wwf0.3N2hf26lwwefP11h节点板厚度126mm，h，'''22ffP5562922kNN0.756316202221.2221.2221120.7hl20.7646012''fw126.03MPa0.8f128MPawf（）（）P5562922kNN0.256316202221.2221.2222120.7hl20.71046012''''fw25.44MPa160MPa图2.18上弦节点“B”h5mmtf10mmhf1264450l282.24mml2l2hw40.710160swf取10mm缝h，取节点板长度为，则节点一侧弦杆焊缝的计算长度fl220w20.15126445020.71022060.15126445084.161.58MPa141.24MPaNfMf20.