Concrete Q&A: Modification of Existing Structure with Change in Loads

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Concrete Q&A: Modification of Existing Structure with Change in Loads

Author(s):

Publication: Concrete International

Volume: 39

Issue: 9

Appears on pages(s): 88

Keywords:

Date: 9/1/2017

Abstract:
The Q&A in the May 2017 CI featured an interesting question about existing structures. The answer is related to one of my current projects. I am the licensed design professional (LDP) responsible for the structural design of a modification of a hotel building at a ski resort. The owner wants to create an exterior rooftop terrace (bar) on the top floor of the building by removing a portion of the existing roof and façade. The original floor was designed for hotel occupancy. However, the new terrace area would be exposed to both snow loads and a higher occupancy floor load. The existing structure is reinforced concrete beam and slab construction from the early 1980s. What are the appropriate code provisions for the evaluation of the existing structure? How should I deal with the snow load (including drifting snow) and increased live load on the new terrace area (again, the structure was designed for residential floor loads)?