下图所示为一铸铁支架固定在水泥地基上,受载荷 R V =5000N ,图。支架与地基间的摩擦系数 f =0.4 ,设螺栓材料为 35 号钢,应力 [ σ ]=80MPa ,螺栓的相对刚度为: ,防滑系数 K s =1.2 。其他尺寸见图。为保证正常工作螺栓的根径 d 1 至少要为多少?
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