Allowable Stress Design and Strength Design


Two design philosophies have long been prevalent:
• Allowable Stress Design
• Strength Design

Allowable stress design (ASD) was the principal method used from the early 1900s until the early 1960s. ?ACI 318-56 was the first standard to officially recognize and permit the use of strength design (SD). ?Starting from the 1963 edition of ACI 318, there was a rapid transition to strength design, largely because of its rational approach and provision of better safety and reliability at the strength limit state.


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