166
𝑀𝑀
𝑐𝑐
= Equation 11-36) Where Mr Factored flexural resistance (kip-in).
𝜑𝜑
𝑓𝑓
= Resistance factor.
𝑀𝑀
𝑚𝑚
= Nominal flexural resistance (kip-in). The nominal flexural resistance is a function of pile shape as well as general pile properties. Steel piles are primarily
H-piles or pipe piles, therefore the step-by-step procedure that follows will consider only these two steel pile types. If
alternative sections are used, the engineer is referred to Article 6.12.2.2 of the AASHTO (2014) specifications. Steel H-piles and I-sections are treated equally for
flexural resistance therefore, part A of this procedure applies to both steel H-piles and miscellaneous I sections.
11.4.5 Step-by-Step Procedure for Nominal Flexural Resistance for Linear Behavior 11.4.5.1 Steel H-Section Step 1: Check flange slenderness ratio and limiting slenderness. 𝜆𝜆
𝑓𝑓
= Equation 11-37)
𝜆𝜆
𝑝𝑝𝑓𝑓
= Equation 11-38)
𝜆𝜆
𝑐𝑐𝑓𝑓
= Equation 11-39) Where
𝜆𝜆
𝑓𝑓
= Slenderness ratio for flange.
𝜆𝜆
𝑝𝑝𝑓𝑓
= Limiting slenderness ratio fora compact flange. r Limiting slenderness ratio fora non-compact flange.
𝑏𝑏
𝑓𝑓
= Flange width (in.
𝑡𝑡
𝑓𝑓
= Flange thickness (int Elastic modulus of steel (ksi).
𝐹𝐹
𝑦𝑦𝑓𝑓
= Minimum yield strength of lower strength flange (ksi).
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