图示拱结构中 杆AB的轴力FNAB为 QQ 20180521020846 png
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举一反三
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图示拱结构中,杆的轴力 (拉力)为:
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图示受拉直杆,其中AB段与BC段内的轴力及应力关系为()。 A: FNAB=FNBCσAB=σBC B: FNAB=FNBCσAB>;σBC C: FNAB=FNBCσAB<;σBC D: FNAB<;FNBCσAB<;σBC
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图示三铰拱,链杆AB轴力(拉力为正)为:ca1b5c20536fea44bf19702cb3951763.png
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图示变截面杆,设AB段和BC段的轴力分别为FNAB和FNBC ,则下列结论中正确的是________。[img=194x60]1802f50df8a2aa0.jpg[/img] A: FNAB = 3kN,FNBC = –6kN B: FNAB = 3kN,FNBC = –9kN C: FNAB = 3kN,FNBC = 6kN D: FNAB = 3kN,FNBC = 9kN
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图示变截面杆,设AB段和BC段的轴力分别为FNAB和FNBC ,则下列结论中正确的是________。[img=194x60]17de93ecacc6d44.jpg[/img] A: FNAB = 3kN,FNBC = –6kN B: FNAB = 3kN,FNBC = –9kN C: FNAB = 3kN,FNBC = 6kN D: FNAB = 3kN,FNBC = 9kN