Refer to Commentary RD. What about post-installed anchors? At small edge distances, anchor capacity will be greatly reduced for seismic design. D makes no mention to grout pad thickness Shear load parallel to concrete edge Breakout capacity doubled per D.
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Refer to Commentary RD. What about post-installed anchors? At small edge distances, anchor capacity will be greatly reduced for seismic design. D makes no mention to grout pad thickness Shear load parallel to concrete edge Breakout capacity doubled per D. Triple Edge Conditions D. In this case, it shall be permitted to base the value of ca1 on the distance from the edge to the axis of the farthest anchor row that is selected as critical, and all of the shear shall be assumed to be carried by this critical anchor row alone.
Lesser values from product-specific tests performed in accordance with ACI For castin headed anchors that will be torqued, the minimum edge distances shall be 6da. Section D. In the absence of product-specific ACI Calculated forces applied to the anchor shall be limited to the values corresponding to an anchor having a diameter of da.
At this timeoutside the scope. What is a safety-related attachment? Will sprinkler systems be attached with cracked concrete anchors? The provisions of this section shall govern the allowable stress design of headed bolts, and headed stud anchors cast in normal-weight concrete for purposes of transmitting structural loads from one connected element to the other. These provisions do not apply to anchors installed in hardened concrete or where load combinations include earthquake loads or effects.
The bearing area of headed anchors shall be not less than one and one-half times the shank area. Where strength design is used, or where load combinations include earthquake loads or effects, the design strength of anchors shall be determined in accordance with Section The provisions of this section shall govern the strength design of anchors installed in concrete for purposes of transmitting structural loads from one connected element to the other.
Headed bolts, headed studs and hooked J- or L- bolts cast in concrete and expansion anchors and undercut anchors installed in hardened concrete shall be designed in accordance with Appendix D of ACI as modified by Section Exception: Where the basic concrete breakout strength in tension of a single anchor, Nb, is determined in accordance with Equation D-7 , the concrete breakout strength requirements of Section D.
The strength design of anchors that are not within the scope of Appendix D of ACI , and as amended above, shall be in accordance with an approved procedure. Modify ACI , section D. What design procedures are approved? Who decides? The provisions of this code are not intended to prevent the installation of any material or to prohibit any design or method of construction not specifically prescribed by this code, provided that any such alternative has been approved.
An alternative material, design or method of construction shall be approved where the building official finds that the proposed design is satisfactory and complies with the intent of the provisions of this code, and that the material, method or work offered is, for the purpose intended, at least the equivalent of that prescribed in this code in quality, strength, effectiveness, fire resistance, durability and safety.
Supporting data, where necessary to assist in the approval of materials or assemblies not specifically provided for in this code, shall consist of valid research reports from approved sources. Clearer provisions for adhesives and concrete screws?
ACI 318-08, Appendix D
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355.3R-11 Guide for Design of Anchorage to Concrete: Examples Using ACI 318 Appendix D