What is the permissible tensile stress in bolts used for column bases?
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A.
120 N/mm2
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B.
150 N/mm2
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C.
0.4 N/mm2
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D.
0.6 N/mm2
Correct Answer:
A. 120 N/mm2
Explanation:
The permissible tensile stress for bolts used in column bases is 120 N/mm2. This value is established by structural design codes to ensure a sufficient factor of safety, typically being much lower than the bolt's yield or ultimate strength. For standard structural bolts like grade 4.6, this limit helps prevent mechanical failure under the significant tensile forces and overturning moments often experienced at the connection between a column base plate and its foundation. In contrast, values such as 0.4 N/mm2 or 0.6 N/mm2 represent ratios of yield strength (0.4fy or 0.6fy) rather than absolute stress limits in N/mm2.
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