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Which of the following relation is correct? (a)Design Strength = Ultimate strength + Partial factor of safety

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in Design of Steel Structures by (962k points)
Which of the following relation is correct?

(a) Design Strength = Ultimate strength + Partial factor of safety

(b) Design Strength = Ultimate strength – Partial factor of safety

(c) Design Strength = Ultimate strength /Partial factor of safety

(d) Design Strength = Ultimate strength x Partial factor of safety

I got this question in exam.

This intriguing question comes from Limit State Method in chapter Basics of Structural Design of Design of Steel Structures

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The correct choice is (c) Design Strength = Ultimate strength /Partial factor of safety

Easiest explanation: Design Strength = Ultimate strength /Partial factor of safety.

This partial safety factor accounts for possibility of unfavourable deviation of material strength from characteristic value, variation of member sizes, reduction in member strength due to fabrication and tolerances and uncertainty in calculation of strength of members.

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