Reshoring and Early-Age Building Behavior-Surveyed Performance of RC and PT Flat Slabs in Multi-Story Buildings Implications for Design (Recorded Presentation)

Surveyed Performance of RC and PT Flat Slabs in Multi-Story Buildings Implications for Design (Recorded Presentation)

Video Transcription

Video Summary

David Shook, an Associate Director at Skidmore, Owings and Merrill, discussed the performance and design practices for reinforced concrete and post-tensioned (PT) flat slabs. Shook emphasized the importance of designing for deflection alongside strength, critiquing guidelines like ACI 318, which primarily focus on strength without adequately addressing deflection, shrinkage, and cracking issues. He highlighted the need for improved design methods that incorporate more accurate predictions of slab behavior, advocating for explicit rebar modeling and expected material properties, especially for long-span or complex systems. Shook also discussed the challenges of current software and guidelines, suggesting more robust methods for shoring and reshoring, particularly in reinforced concrete (RC) systems. He called for committees, like ACI 347, to enhance their recommendations for design engineers. Real-world examples were used to show the effectiveness and challenges of current practices, stressing the need for more accurate survey data and design load combinations to improve construction and design processes.

Keywords

reinforced concrete

post-tensioned slabs

deflection design

ACI guidelines

shoring methods