D1 Definitions
Anchor A steel element either cast into concrete or post-installed into a hardened concrete member and used to transmit applied loads, including headed bolts, hooked bolts J- or L-bolt , headed studs, expansion anchors, or undercut anchors. Anchor group A number of anchors of approximately equal effective embedment depth with each anchor spaced at less than three times its embedment depth from one or more adjacent anchors. Anchor pullout strength The strength corresponding to the anchoring...
1214 Splices of reinforcement General
12.14.1 Splices of reinforcement shall be made only as required or permitted on design drawings, or in specifications, or as authorized by the engineer. 12.14.2.1 Lap splices shall not be used for bars larger than No. 11 except as provided in 12.16.2 and 15.8.2.3. 12.14.2.2 Lap splices of bars in a bundle shall be based on the lap splice length required for individual bars within the bundle, increased in accordance with 12.4. Individual bar splices within a bundle shall not overlap. Entire...
R93 Design strength
R9.3.1 The design strength of a member refers to the nominal strength calculated in accordance with the requirements stipulated in this code multiplied by a strength reduction factor which is always less than one. The purposes of the strength reduction factor are 1 to allow for the probability of under-strength members due to variations in material strengths and dimensions, 2 to allow for inaccuracies in the design equations, 3 to reflect the degree of ductility and required reliability of the...
A 1
effective cross-sectional area within a joint in a plane parallel to plane of reinforcement generating shear in the joint, in.2, see 21.5.3.1, Chapter 21 total area of longitudinal reinforcement to resist torsion, in.2, Chapter 11 minimum area of longitudinal reinforcement to resist torsion, in.2, see 11.6.5.3, Chapter 11 area of reinforcement in bracket or corbel resisting tensile force Nuc, in.2, see 11.9, Chapter 11 area of a face of a nodal zone or a section through a nodal zone, in.2,...
R35 Steel reinforcement
R3.5.1 Fiber reinforced polymer FRP reinforcement is not addressed in this code. ACI Committee 440 has developed guidelines for the use of FRP reinforcement.3.2, 33 Materials permitted for use as reinforcement are specified. Other metal elements, such as inserts, anchor bolts, or plain bars for dowels at isolation or contraction joints, are not normally considered to be reinforcement under the provisions of this code. R3.5.2 When welding of reinforcing bars is required, the weldability of the...
Aci Committee 360.1.9
1.1.2 This code supplements the general building code and shall govern in all matters pertaining to design and construction of structural concrete, except wherever this code is in conflict with requirements in the legally adopted general building code. 1.1.3 This code shall govern in all matters pertaining to design, construction, and material properties wherever this code is in conflict with requirements contained in other standards referenced in this code. 1.1.4 For special structures, such...
Introduction
This commentary discusses some of the considerations of Committee 318 in developing the provisions contained in Building Code Requirements for Structural Concrete ACI 318-05 , hereinafter called the code or the 2005 code. Emphasis is given to the explanation of new or revised provisions that may be unfamiliar to code users. In addition, comments are included for some items contained in previous editions of the code to make the present commentary independent of the previous editions. Comments on...