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Minimum lap splice lengths for welded wire reinforcement (WWR) are presented in Section 25.5.4 of ACI 318-19 and Section 3.3.2.5(a) of ACI 301-20. In this Q&A, these requirements are interpreted for slabs-on-ground that are not included as part of a building’s lateral force-resisting system. In addition, the Q&A discusses crack control recommendations for slabs-on-ground per ACI 360R-10.
Available in the following language(s): Spanish
The ACI Foundation is now accepting Fellowship and Scholarship applications from students pursing a degree related to concrete.
Available in the following language(s): Spanish
Chapter 22 of the ACI 318-19 Code requires determination of the neutral axis depth before calculating the nominal shear strength at a section. However, the location of the neutral axis will vary with axial force and moment at a section. Thus, identical columns in a structure may have different depth values, leading to unnecessary complexity in building design. This article presents a procedure that simplifies the shear strength determination for reinforced concrete columns by eliminating the need to calculate the neutral axis depth.
Available in the following language(s): Spanish
Members of ACI Committee 330 have questioned the applicability of ACI 117-10(15) tolerances for concrete slabs-on-ground (typically interior slabs with horizontal top and bottom surfaces) for sloped slabs-on-ground. The article discusses thickness variations evaluated for 32 slab-on-ground parking lot pavement placements. Based on the data, the authors propose thickness tolerances for adoption by Joint ACI-ASCC Committee 117 and ACI Committee 330.
Available in the following language(s): Spanish
Q.Who is responsible for coordinating construction tolerances on a project: the designer or the contractor?
Available in the following language(s): Spanish