Sessions & Events


Please note: All sessions and events take place in Central Daylight Time: CDT (UTC-5).

H=Hyatt Regency Dallas; U=Union Station

Code-307-22: Reinforced Concrete Chimneys

Monday, October 24, 2022  8:30 AM - 10:30 AM, H-Reunion C

This session will present requirements of ACI CODE-307 - Standardization Requirements for Reinforced Concrete Chimneys - Code and Commentary. This revision has been completely reorganized to follow the current ACI 318 format. Additionally, technical changes for the along-wind load, across-wind load, and seismic design and detailing will be discussed.

The session will also present a history of concrete chimneys within ACI, as well as a proposed variable strength reduction factor for design of chimneys.

Attendees would include designers and contractors.

Learning Objectives:
(1) Discuss the historical development of the ACI 307 committee;
(2) Recognize the organizational and technical differences between ACI 307-08 and ACI 307-22;
(3) Explain how wind and seismic load information from ASCE 7-16 is applied to chimneys in ACI 307-22;
(4) Interpret how combined flexural and axial strength is determined in ACI 307-22 and understand the limitations of the method used.

This session has been AIA/ICC approved for 2 CEU/PDH credits.

Reinforced Concrete Chimneys In ACI: More than a Century of Progress

Presented By: F Alan Wiley
Description: A history of the ACI committee on reinforced concrete chimneys.

The New ACI 307 - Upcoming Changes

Presented By: F Alan Wiley
Description: The American Concrete Institute's Code Requirements for Reinforced Concrete Chimneys (ACI 307-08) is the current ACI standard for the design and construction of concrete chimneys. It was last revised in 2008 and is presently in the process of being updated and reorganized by ACI Committee 307. This presentation will address: - The primary reasons for the update. - A discussion of the reorganization of the Code. - The major provisions that are being revised and the scope of the revisions. - The current status and timeline for publication of the new Code.

Across-Wind Load Calculations in ACI 307-22

Presented By: Denis Radecki
Description: Beginning with the 2010 edition of ASCE/SEI 7, the basic wind speed is specified as the speed corresponding to strength level design forces, that is, the load factor for wind is now 1.0. Also it was noted in ASCE/SEI 7 that concrete structures behave more elastically due to strength level wind forces than they do to strength level seismic forces. Both of these facts required changes to the across-wind calculations in ACI 307. In this paper, the author presents the across-wind load calculations of ACI 307-22. In addition, the across-wind load response for 25 sample chimneys using the ACI 307-22 procedure is presented and compared to the response computed in accordance with ACI 307-08.

Designing and Detailing for Earthquake Using ACI 307-22

Presented By: Denis Radecki
Description: ACI 307-22 incorporates some additional requirements for the design and detailing of chimneys for earthquake loading. Primarily, these requirements are consistent with those first enumerated in ASCE/SEI 7-10, Chapter 15 addressing nonbuilding structures. This paper compares the earthquake loading and detailing required by ACI 307-22 to that required by ACI 307-08.

Upper Level Sponsors

Ash Grove
Controls Group
Euclid Chemical
Master Builders
ACI Northeast Texas Chapter

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