拉力栓钉例题

1、 【例题3】试验算下图的连接。普通螺栓（C级），杆径d=22mm，构件钢材为Q235。Xe580解：2.判断大小偏心1.受力分析：轴心力N=250KN弯矩M=Ne=250120=30 000KNmm 22221min24 (40120200 )22400025030000 20012224000iiyMyNNny 22221min24 (40120200 )22400025030000 20012224000iiyMyNNny 22221min24 (40120200 )22400025030000 20012224000iiyMyNNnymax6KNN max6KNN 0NX5M 应按大偏心

2、计算（2）计算危险螺栓受力（将N简化至底排中心）受力：弯矩 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) 单栓抗拉承载力设计值：3max303 170 1051.51bbtetNA fKNN3max303 170 1051.51bbtetNA fKNN3max303 170 1051.51bbtetNA fKNN3max303 170 1051.51bbtetNA fKNN所以，此连接强度满足要求Xe5NX图4-54 例题11.12【例题4】牛腿与柱用C级普通螺栓连接，承受竖向荷载F=200KN，偏心距e=200mm，构件钢材为Q235，螺栓M20，试验算连接强度。解：（1）计算单栓承载力设计值单栓抗剪承载力设计值：223201130 1040.844bbVVVdNnfKN 320 18 305 10109.8bbccNdt fKN单栓抗拉承载力设计值3245 170 1041.65bbtetNA fKN （2）计算危险螺栓受力螺栓群受力200VFKN 200 20040000MFeKN mmX图4-54 例题11.12222222 (80160240320 )iy3840000 11220033.310MtiMyNKNy(3) 验算危险螺栓连接强度 22()()VtbbVtNNNN222033.3()()0.938140.841.6512002010VVVN