Title:
Concrete Q&A: Designing Beams in Mat Foundation and more
Author(s):
Publication:
Concrete International
Volume:
41
Issue:
8
Appears on pages(s):
71-72
Keywords:
DOI:
10.14359/51719101
Date:
8/1/2019
Abstract:
Section 18.13.3.3 of ACI 318-141 states: “Grade beams and beams that are part of a mat foundation subjected to flexure from columns that are part of the seismic-force-resisting system shall be in accordance with 18.6.” Section 18.6 applies to “beams of special moment frames that form part of the seismic-forceresisting system and are proportioned primarily to resist
flexure and shear.” Because a mat foundation is a flexural member, does this clause mean that a solid mat needs to be detailed like a special moment frame? In other words, what are “beams that are part of a mat foundation”?
For coupled shear walls in Seismic Design Category (SDC) B or C, are the link beams to be designed as ordinary moment frame beams or intermediate moment frame beams?
What is a recommended spacing for contraction joints in concrete walls in buildings?
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.
2. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19),” American Concrete Institute, Farmington Hills, MI, 2019, 623 pp.
3. ACI Committee 336, “Suggested Analysis and Design Procedures for Combined Footings and Mats (ACI 336.2R-88) (Reapproved 2002),” American Concrete Institute, Farmington Hills, MI, 1988, 20 pp.
4. ACI Committee 224, “Joints in Concrete Construction (ACI 224.3R-95) (Reapproved 2013),” American Concrete Institute, Farmington Hills, MI, 1995, 41 pp.