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

28 3 2021 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 is proposed to analyze shear force transfer from anchors to pedestal and to design the required amount of shear reinforcement A proposed design procedure is illustrated in an example problem This paper presents a

A 5 fractile strength is the nominal strength for which there is a 90 confidence that there is a 95 probability of the actual strength exceeding the nominal strength For anchors that are designed using ACI 318 Appendix D AC193 or AC308 it is possible to convert design strengths i e ΦN n or ΦV n to allowable loads using the following approach from AC193

Req d Anchor Reinf Strength N The required anchor reinforcement strength must be equal or larger than the anchor bolt steel strength ΦNsa if anchor design includes earthquake forces for structures assigned with Seismic Design Category is C D E or F ACI Section D3 3 2

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

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 of

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 assigned with Seismic Design Category is C D E or F ACI Section D3 3 2 Anchor Reinforcement Size Size of steel rebar from 10mm to 43mm 3

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

ARCH 331 Note Set 22 1 Su2014abn 5 Reinforced Concrete Beam Members Strength Design for Beams Sstrength design method is similar to LRFD There is a nominal strength that is reduced by a factor which must exceed the factored design stress

1 Concrete is cracked 2 Condition A supplementary reinforcement is provided 3 Load combinations shall be per ACI 318M 14 5 3 1 4 Anchor reinft strength is used to replace concrete tension shear breakout strength as per ACI 318M 14 Appendix D

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

21 4 2018 nbsp 0183 32 This is the part two of the previous article Anchoring to Concrete Tensile Loadings As summarized in the previous article the Strength design of anchors shall be check and satisfy the following criteria Tension Loadings Steel strength of anchor in tension Concrete breakout strength of anchor in tension Pull out strength in tension

forces are directly transferred to anchor reinforcement that carries these anchor forces into the member beyond the anchor region RD 3 3 2 Post installed anchors must meet ACI 355 2 or AQCI 355 4 D3 3 3 Anchors in Seismic Design Category C D E and F structures must satisfy all the non seismic

Supplementary Reinforcement Design Checks Required Supplementary reinforcement designed to resist shear forces on the anchor need not be assessed for anchorage in the failure zone if they are designed as loops or stirrups as detailed in the previous section This is the design bond strength between the concrete and the reinforcing steel

Anchor Reinforcement ExcelCalcs great www excelcalcs com Req d Anchor Reinf Strength N The required anchor reinforcement strength must be equal or larger than the anchor bolt steel strength ΦNsa if anchor design includes earthquake forces for structures assigned with Seismic Design Category is C D E or F ACI Section D3 3 2

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

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

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

30 9 2011 nbsp 0183 32 Φ – Strength reduction factor for breakout strength and its value for non reinforcement in tension is 0 70 A Nc –Total projected area for the group of anchors of the failure surface as approximated by a rectangle with edges bounded by 1 5h ef 1 5 10 15 inch in our case and the free edges of the concrete from the centerline of the anchors

28 3 2021 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 is proposed to analyze shear force transfer from anchors to pedestal and to design the required amount of shear reinforcement A proposed design procedure is illustrated in an example problem This

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

Strength N The required anchor reinforcement strength must be equal or larger than the anchor bolt steel strength ΦNsa if anchor design includes earthquake forces for structures assigned with Seismic Design Category is C D E or F ACI Section D3 3

Suitable for use in seismic design Anchor has an effective pull down feature or is a stud anchor It has the ability to clamp sy reinforcing bar steel yield strength N mm2 f u characteristic ultimate steel tensile strength MPa f y characteristic steel yield strength MPa

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

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

Anchor bolt design based on Anchor reinforcement f s 0 75 Anchor reinft strength is used to replace concrete tension shear breakout strength as per 17 4 2 9 amp 17 5 2 9 ACI 318

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

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

The Appendix D of the ACI 318 05 provides design requirements for anchors in un reinforced concrete It addresses only the anchor strength and the un reinforced concrete strength 1 Breakout strength 2 Pullout strength 3 Side face blowout strength 4 Pryout strength Even though the Appendix D of the ACI 318 05 permits the use of supplementary

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