Existing design codes recommend hairpins and surface reinforcement consisting of hooked bars encasing an edge reinforcement to improve the behavior of anchor connections in shear Part 6 Structural Design 6 2 Vol 2 225 Area of reinforcement in bracket or corbel resisting tensile force 0 232 214 mm2 see 6 4 7 Sec 6 4 225 237 Area of a face of a nodal zone or a section through a nodal zone mm2 Appendix A 199 214 Projected concrete failure area of a single anchor or group of anchors for calculation of2018 6 1 nbsp 0183 32 Anchor reinforcement in this study is that specifically designed and detailed such that the reinforced anchors achieve their full design capacities U shaped hairpins are specified in the current building codes and design guides In addition reinforcing bars placed near anchor bolts have been expected to create loading transferring paths through a splice The tensile strength of rebar is a very important factor that we need to know in nonlinear designs In linear design the strength of the reinforcement is basically considered up to the yielding However when we concentrated on the nonlinear designs we used most out of the stress that rebar can be bared without failure Design of Anchorage Zone Reinforcement in Prestressed Concrete Beams by Peter Gergely and Mete A Sozen most often associated with anchor age zone cracking strength of the concrete under the complex conditions of stress is known

1 1 1992 nbsp 0183 32 Calculation of design anchorage length of longitudinal reinforcement according to EN1992 1 1 167 8 4 Ultimate bond stress f bd The design value of ultimate bond stress for ribbed bars is defined in EN1992 1 1 167 8 4 2 2 f bd 2 25 ⋅ η 1 ⋅ η 2 ⋅ f ctd where f ctd α ct ⋅ f ctk 0 05 γ c is the design tensile strength of concrete determined according to EN1992 1 1 2022 2 26 nbsp 0183 32 1 Req d Anchor Reinf Strength V The required anchor reinforcement strength must be equal or larger than the anchor bolt steel strength ΦVsa if anchor design includes earthquake forces for structures Anchor reinforcement as defined in ACI 318 Appendix D is reinforcement designed and detailed specifically to transfer the full anchor load from the anchor into the structural member For conditions in which the anchor force exceeds the concrete breakout design strength the design strength of anchor reinforcement typically installed before the concrete is cast 2021 3 28 nbsp 0183 32 Anchor reinforcement consists of longitudinal rebar and ties to carry anchor tension forces and shear forces respectively The Strut and Tie Model 13 10 2011 nbsp 0183 32 Φ – Strength reduction factor for breakout strength and its value for non reinforcement in tension is 0 70 A vc – projected concrete failure area of the group of anchors for calculation of strength in shear in inch 2 as approximated by a rectangle with edges bounded by 1 5 Ca1 1 5 5 7 5 inch in our case and the free edges of the concrete from the

1992 1 1 nbsp 0183 32 Calculation of design anchorage length of longitudinal reinforcement according to EN1992 1 1 167 8 4 Ultimate bond stress f bd The design value of ultimate bond stress for ribbed bars is defined in EN1992 1 1 167 8 4 2 2 f bd 10 3 2021 nbsp 0183 32 Reinforcement and connectors are essential to ensure a proper load path in masonry buildings This session of Masonry Night School Strength Design of Masonry will review basic detailing requirements for reinforcement and connectors and specific requirements for strength design of masonry Lap length requirements for reinforcement and design of 15 3 2021 nbsp 0183 32 The use of supplementary reinforcement is similar to the anchor reinforcement but it isn t specifically designed to transfer loads If supplementary reinforcement is used the concrete strength reduction factor f is increase 7 from 0 70 to 0 75 which is not that significant in terms of increasing concrete breakout strength 2020 5 12 nbsp 0183 32 failure anchor reinforcement and supplemental reinforcement The design approach used in the example problems follows a basic outline of evaluating each potential failure mode in design strength of the anchor or group of anchors 1 3 Commentary on seismic requirements for Appendix D of ACI 318 02 and ACI 318 052017 3 7 nbsp 0183 32 Design PBLSD the anchor bolt design resistance is greater than or equal to the effective combined tension 7 and shear Vi load effects as indicated below see Appendix G AtFy gt T where AtFy Nominal design resistance capacity equal to the product of the bolt tensile area 4 and the minimum specified steel yield strength see Table 2A

27 6 2019 nbsp 0183 32 It seems that they are also basing their assumptions on a smooth reinforcing bar vs typical deformed bars I later also found a document spreadsheet example on civil bay for anchor shear reinforcement design that appeared to be using the methods discussed in the paper and or similar strut and tie method to design the ties 2017 6 22 nbsp 0183 32 Anchor design for the concrete breakout pullout bond strength and pryout failure modes depend upon judgment of cracked versus uncracked concrete in computations Courses and control of cracking are discussed in Ref 4 as follows Plastic Shrinkage Cracking This is due to the evaporation of water near theThe required area of steel reinforcement Ast can be determined as follows 2 5 Tu Ast ≥ 3 φ fy where Ase effective cross sectional area of anchor Tu factored tension design load per anchor φ 0 90 strength reduction factor Chapter 9 of the ACI 318 05 fy specified minimum yield strength of reinforcement futa specified minimum tensile strength of anchor steel Where anchor reinforcement is developed in accordance with Chapter 25 on both sides of the breakout surface the design strength of the anchor reinforcement shall be permitted to be used instead of the concrete breakout strength in determining ϕN n A strength reduction factor of 0 75 shall be used in the design of the anchor reinforcement 2022 2 17 nbsp 0183 32 The reinforcement dialogue box including the anchor properties for the base case Analysis 1 with the computed pull out resistance values in the green box the factor of safety dependence in yellow force distribution option indicated by the blue box and the application of shear forces in orange

2016 10 11 nbsp 0183 32 CAPACITY DESIGN OF GROUTED ANCHORS Matthew Miltenberger P E Master Builders Inc Cleveland OH ABSTRACT Currently building codes do not address strength design of post installed grouted fasteners even though grouts are For c gt minimum concrete cover to reinforcement ACI Chapter 7 and 2 times maximum size aggregate If c lt The anchor design tensile strength shall be calculated in accordance with 17 10 5 4 d The anchor or group of anchors shall be designed for the maximum tension obtained from design load combinations that include E with E increased by Ω o The anchor design tensile strength shall be calculated from 17 10 5 4 18 5 2010 nbsp 0183 32 One of the major additions incorporated in Appendix D of ACI 318 08 is the definition of anchor reinforcement in addition to the previously defined supplementary reinforcement However ACI 318 08 does not provide the specific guidelines for designing such reinforcement This paper presents methods for designing a typical anchorage in reinforced concrete Building Code Requirements for Masonry Structures ref 1 contains anchor bolt design provisions for both the allowable stress design and strength design methods Chapters 2 and 3 respectively An overview of these design philosophies can be found in Allowable Stress Design of Concrete Masonry TEK 14 7C and Strength Design Provisions for Concrete Masonry 2019 6 27 nbsp 0183 32 Good morning all I am working on a connection of a steel column to a concrete pier with shear transfer via the anchor bolts Hopefully someone can help shed some light on this for me I was looking over the Design of Anchor Reinforcement in Concrete Pedestals by Widianto Patel and Owen

Tags: