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2013 Fall Convention

ACI Fall 2013 Convention

October 20-24, 2013
Phoenix, AZ


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Design Detailing to Mitigate Cracking

Tuesday, April 16, 11:00 AM - 1:00 PM,


ACI Committee 224 is in the final stages of producing a new document "Guide to Design Detailing to Mitigate Cracking" that provides recommendations for design details and structural framing guidelines to mitigate and control cracking in concrete buildings. The objective of this document is to address the mitigation and control of cracking by considering the overall nature of a structure and how members may experience additional cross-sectional stresses due to the restraint caused by the structural system. The effect of the geometry and layout of the concrete framing system on the unexpected cracking of individual members or joints is discussed, and recommendations for more favorable arrangements of structural framing to minimize restraint are presented. Additionally, specific framing conditions where the cracking of a particular part of the structure is directly or indirectly affected by the neighboring elements or the overall framing system are discussed, and suggested reinforcement and release details to avoid or minimize such cracking are provided. The session will present the main aspects of the document in terms of mitigation concepts, reinforcement details and effective practices to mitigate and control cracking. By attending this session, attendees will be able to: 1. Identify aspects of the structural system that may lead to development of cracking due to restraint effects; 2. Identify the possible predominate crack development, crack types, and crack locations for the main components of the structure, including one- and two-way slabs, columns and slabs-on-ground; 3. Consider alternate structural system arrangements that may reduce the formation of restraint cracking; and 4. Examine and select appropriate design details, including reinforcement and release details to mitigate and control cracking.

Detail Detailing to Mitigate Cracking - An Overview

Presented by: Florian Barth

Description: This presentation will provide an overview of the concepts and objectives that lead to the development of a new ACI Committee 224 document “Guide to Design Detailing to Mitigate Cracking.” Basic concepts and terminology relating to restraint cracking in building structural systems will be presented. The importance of considering the structure as an overall system, as well as the behavior of individual subsystems and members, in mitigating and controlling cracking in concrete buildings will be discussed.


Detailing of Two-way Slab Systems

Presented by: Florian Barth

Description: This presentation will discuss the sources of restraint cracking in building two-way slab systems, and will present solutions to reduce or control cracking. Detailing approaches discussed will include alternate structural system arrangements to minimize restraint, and the use of release and reinforcement details to control cracking locations and widths.


Detailing of One-Way Slab Systems

Presented by: Randall Poston

Affiliation: WDP & Associates PC

Description: This presentation will discuss the sources of restraint cracking in building one-way slab systems, and will present solutions to reduce or control cracking. Detailing approaches discussed will include alternate structural system arrangements to minimize restraint, and the use of release and reinforcement details to control cracking locations and widths.


Detailing of Columns

Presented by: Ralf Leistikow

Affiliation: Wiss Janney Elstner Assoc Inc

Description: This presentation will discuss the sources of restraint cracking in building columns, and will present solutions to reduce or control cracking. Detailing approaches discussed will include alternate structural system arrangements to minimize restraint, and the use of release and reinforcement details to control cracking locations and widths.


Detailing of Slabs-on-Ground

Presented by: Harvey Haynes

Affiliation: Haynes & Associates

Description: This presentation will discuss the sources of restraint cracking in slabs on ground in buildings, and will present solutions to reduce or control cracking. Detailing approaches the use of joints and reinforcement details to control cracking locations and widths.