1、 【例題3】試驗算下圖的連接。普通螺栓（C級），桿徑d=22mm，構件鋼材為Q235。Xe580解：2.判斷大小偏心1.受力分析：軸心力N=250KN彎矩M=Ne=250120=30 000KNmm 22221min24 (40120200 )22400025030000 20012224000iiyMyNNny 22221min24 (40120200 )22400025030000 20012224000iiyMyNNny 22221min24 (40120200 )22400025030000 20012224000iiyMyNNnymax6KNN max6KNN 0NX5M 應按大偏心

2、計算（2）計算危險螺栓受力（將N簡化至底排中心）受力：彎矩 250 320 80000MNeKN250 320 80000MNeKN250 320 80000MNeKN2222221max22 (40032024016080 )70400080000 40045.5704000iiyMyNKNy 2222221max22 (40032024016080 )70400080000 40045.5704000iiyMyNKNy 2222221max22 (40032024016080 )70400080000 40045.5704000iiyMyNKNy 2222221m ax22(4 0 03

3、2 02 4 01 6 08 0 )7 0 4 0 0 08 0 0 0 04 0 04 5 .57 0 4 0 0 0iiyM yNK Ny 2222221m ax22(4 0 03 2 02 4 01 6 08 0 )7 0 4 0 0 08 0 0 0 04 0 04 5 .57 0 4 0 0 0iiyM yNK Ny 2222221m ax22(4 0 03 2 02 4 01 6 08 0 )7 0 4 0 0 08 0 0 0 04 0 04 5 .57 0 4 0 0 0iiyM yNK Ny 2222221max22 (40032024016080 )70400080000

4、40045.5704000iiyMyNKNy (3) 單栓抗拉承載力設計值：3max303 170 1051.51bbtetNA fKNN3max303 170 1051.51bbtetNA fKNN3max303 170 1051.51bbtetNA fKNN3max303 170 1051.51bbtetNA fKNN所以，此連接強度滿足要求Xe5NX圖4-54 例題11.12【例題4】牛腿與柱用C級普通螺栓連接，承受豎向荷載F=200KN，偏心距e=200mm，構件鋼材為Q235，螺栓M20，試驗算連接強度。解：（1）計算單栓承載力設計值單栓抗剪承載力設計值：223201130 1040.844bbVVVdNnfKN 320 18 305 10109.8bbccNdt fKN單栓抗拉承載力設計值3245 170 1041.65bbtetNA fKN （2）計算危險螺栓受力螺栓群受力200VFKN 200 20040000MFeKN mmX圖4-54 例題11.12222222 (80160240320 )iy3840000 11220033.310MtiMyNKNy(3) 驗算危險螺栓連接強度 22()()VtbbVtNNNN222033.3()()0.938140.841.6512002010VVVN