Which design philosophy is commonly used in Canadian structural design for steel and concrete, and what is the core objective?

Which design philosophy is commonly used in Canadian structural design for steel and concrete, and what is the core objective?

• A. Allowable Stress Design; objective to maximize economy.
• B. Load and Resistance Factor Design; objective to minimize deflection.
• C. Limit State Design (Strength Design); objective to ensure members and connections reach adequate strength under governing load combinations while controlling deflections and crack widths within serviceability limits.
• D. Direct Strength Check; objective to ignore serviceability criteria.

Answer: (C)

Limit State Design is used in Canadian structural design for steel and concrete, focusing on both strength and serviceability. The main idea is to ensure that members and connections develop enough strength under the governing combination of loads to avoid failure, while also keeping serviceability aspects like deflections and crack widths within allowable limits so the structure remains functional and durable. This approach blends a robust ultimate limit state check with practical serviceability controls, rather than prioritizing economy alone or ignoring serviceability criteria.

Limit State Design is used in Canadian structural design for steel and concrete, focusing on both strength and serviceability. The main idea is to ensure that members and connections develop enough strength under the governing combination of loads to avoid failure, while also keeping serviceability aspects like deflections and crack widths within allowable limits so the structure remains functional and durable. This approach blends a robust ultimate limit state check with practical serviceability controls, rather than prioritizing economy alone or ignoring serviceability criteria.