Code Deflections Provisions for Two-way Slabs Deflections

Open Access
Cohen, Laura Claire
Graduate Program:
Civil Engineering
Master of Science
Document Type:
Master Thesis
Date of Defense:
May 01, 2012
Committee Members:
  • Andrew Scanlon, Thesis Advisor
  • two-way slabs
  • deflections
The current code provisions for design and analysis of two-way slab deflections on the long term are known to be inefficient for heavily loaded systems which often experience excessive deflections, causing damages to partitions and hanging objects below. An experiment monitoring one-way slab deflections during a five years period was set up and the data was used to investigate the ACI318 Code requirements for deflection computation. Based on those observations and further literature review, new requirements were recommended and a study of podium slabs was done to compare them to the ACI318 Code requirements. A podium slab is a type of heavily loaded slab supporting wood-framed multi-story residential buildings above a parking lot. The expected deflections for an interior panel of different typical slab layouts were computed following ACI318 and updated requirements and conclusions were drawn to suggest improvements to the ACI318 Code with regards to the design and analysis of two-way slabs for serviceability.