钢结构原理与设计第2版__课后答案.docx

《钢结构原理与设计第2版__课后答案.docx》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、4-1解:12NgNgkqNqk1.2—3151.4—315420kN33185N/mm2，焊缝质量为三级，用引弧板施焊。查表得E43焊条的ftWQ235钢的f215N/mm2。Nbf^42010320018511.35mmlWlWtftWlWt1.36NkNkftlwt1.36215376121.36713.3kN故取t12mm。4-2解：NgNgkqNqk1.20.2Nk1.40.8山1.36^焊缝质量为二级，ftW215N/mm2未用引弧板施焊400212376mm4-4解:1）焊脚尺寸hf背部尺寸hf11.5tmax1.5.104.74mmhf11.2

2、tmin1.289.6mm趾部尺寸hf21.5tmax1.5.104.74mmhf2gn1~281~26~7mm为方便备料，取hf1hf2hf6mm,满足上述要求。2）轴心力N的设计值NgNgkqNqk1.20.11801.40.9180248.4kN:等边角钢内力分配系按角钢背与趾部侧面角焊缝内力分配系数可知数e0.3至0.7bb对角钢趾部取力矩平衡得：MbNe2N1e2N0.3N0.3248.474.52kNbN2NNi0.7N0.7248.4173.88kN3）焊缝长度。当构件截面为一只角钢时，考虑角钢与节点板单面连接所引起的偏心影响，ftW应乘以折减系

3、数0-85。角钢趾：Iw1N174.521031W130mm8hf48mm0.7hf0.85fW0.760.85160取l1140mm（1302hf142mm，取10mm的整数倍）角钢背：lW2N2173.88103c—“2W304mm60hf360mm0.7hf0.85fW0.760.85160取12320mm（3042hf316mm，取10mm的整数）4-5解：腹板受到轴心拉力Nk作用NgNgkqNqk1.20.24401.40.8440598.4kN焊脚尺寸hf8~9mmhf1.5jtmax5.6mmhf也(1~2)取hf6mm时，lWN20.7hffW

4、598.410320.76160445.2mm60hf360mm不可行；取hf7mm时，匚381,6mm，lw60hf420mm可行，I381.62hf395.6mm，取

5、400mm取hf9mm时，lw296.8mm，lw60hf540mm可行，I296.82hf314.8mm，取

6、320mm故最小的焊脚尺寸可取7mm,钢板搭接长度为400mm最大的焊脚尺寸可取9mm，钢板搭接长度为320mm4-7解：(1)直接计算法MNI500.210kNmM101061488.12f22N/mm0.7hfl：60.7hf24026hfN0.7hflw501030.7hf2

7、40297.6hfN/mm2160解得：hf7.85mm米用hf8mm1.51tmaxtmin1.5J186.36mm可1~28~9mm'(2)试算法tmin1~28~9mm取hf8mmAvhelW0.7hflw0.782401344mm：ww1h

8、2—he

9、w丄0.78240253760mm366M10106186.36mm2f0.7hfk6186.0N/mm0.7824026hf1.5tmax1.52501030.7hflw0.78240372N/mm2故hf8mm4-8解：218622——37.22156.9N/mm21.22W160N/mm2R1.22

10、5%Rk1.475%Rk405kNl300mmlh801070mm取焊脚尺寸hf6mmhe0.7hf4.2mm(1)几何关系水平焊缝计算长度lWhlhhf70664mm全部焊缝计算长度lW2lWh300264428mm全部焊缝有效截面helW形心位置X2helWh2he6.46.42he42.80.96cm略去he3项lxhe]'212helWh30.42302120.422154.6cm4Iy2helwh12he^IWh2he^X0.426.43120.426.4640.9620.426.40.96247.8cm4焊缝有效截面对形心O的极惯性矩I0lxIy2

11、154.647.82202.4cm4(2)强度验算R-202.5kNa80x70.4mm2RaT240570.4臣14.3kNX11lwhx649.654.4mmy12150mmTx114・310654・435.3N/mm242202.410Ty1I014.310615097.4N/mm22202.410423V202.510A4.24282112.7N/mm33剪力和扭矩共同作用下的强度条件33T2f235.3112.71.222297.4155.6N/mmW160N/mm25-1解：NgNgkqNqk贝S：N1.210%5601.490%560772.8

12、kN查表，得：钢板螺栓孔壁承压承载力设