Desain Angkur Bolt

Anchor Bolt Capacity According to ACI 318M-05 Appendix D

Introduction • • •

Batasan maximum fc’ yang diatur dalam ACI 318 adalah 70 MPa untuk cast-in anchor dan 55 MPa untuk post-installed anchor  Load Load com combi bin natio ation n meng mengg gunak unakan an Ulti Ultima mate te Str Stren engt gth h Desi Design gn Stre Streng ngth th redu educti ction fact actor (Ø) Tension 0.80 Shear 0.75

General Requirement for Strenght of anchor • 1. 2. 3. 4. • 1. 2. 3.

Tension Steel Strength of Anchor in Tension Concrete Breakout Strength of Anchor Pullout Strength in Anchor Concrete Side-Face Blow Out Shear Steel Strength of Anchor in Shear Concrete Breakout Strength of Anchor Concrete Pryout Strength of Anchor

Steel Strenght of Anchor in Tension Kapasitas Anchor Bolt dihitung berdasarkan rumus berikut : NSA = n.Ase.futa n Asa futa

: jumlah anchor : area of anchor bolt : min (1.9fya or 860 MPa)

Concrete Breakout Strength of Anchor in Tension

Rumus kapasitas breakout strength adalah sebagai berikut Single Anchor :

Group Anchor :

Concrete Breakout Strength of Anchor in Tension Dimana ANC ANCO Nb Ψed,N Ψc,N Ψcp,N Ψec,N

: : projected concrete failure area of single anchor group : projected concrete failure area of single anchor with an edge distance equal to 1.5h ef : basic concrete breakout strength of single anchor in tension : modification factor for edge effect : modification factor for no cracking effect on service load : modification factor for post installed anchor. For cast in taken 1.0 : modification factor for anchor group loaded eccentrically in tension

Concrete Breakout Strength of Anchor in Tension Perhitungan Nb

:

Concrete Breakout Strength of Anchor in Tension Calculate ANCO

Concrete Breakout Strength of Anchor in Tension Calculate AN

Concrete Breakout Strength of Anchor in Tension Calculate AN jika jarak ke pinggir anchor bolt kurang dari 1.5hef

Pull out strength of anchor in tension Nominal Pullout Strength

For concrete indicate no cracking

Concrete Side-Face Blow Out in Tension Single bolt capacity

:

Group bolt capacity

:

Steel Strength Anchor in Shear Capacity of Single Bolt :

Concrete Breakout Strength Anchor in Shear Capacity of Single Bolt :

Capacity of Group Bolt :

Concrete Breakout Strength of Anchor in Shear Dimana AVC AVCO Vb Ψed,V Ψc,V Ψec,V

: : projected concrete failure area of single anchor group : projected concrete failure area of single anchor with an edge distance equal to 1.5h ef : basic concrete breakout strength of single anchor in shear : modification factor for edge effect : modification factor for no cracking effect on service load : modification factor for anchor group loaded eccentrically in tension

Concrete Breakout Strength of Anchor in Shear Perhitungan Vb :

Concrete Breakout Strength of Anchor in Shear Calculate AVCO

Concrete Breakout Strength of Anchor in Shear Calculate AVC

Calculate AVC on edge

Concrete Breakout Strength of Anchor in Shear Calculate AVC on group of anchor

Concrete Breakout Strength of Anchor in Shear Calculate AVC if distance bolt to edge is very deep

Concrete Pryout Strength Anchor in Shear Capacity of Single Bolt :

Capacity of Group Bolt :

Shear and Tension Interaction

Kesimpulan Selain dengan kedalaman anchor, jarak antar anchor dan jarak anchor ke pinggir beton mempengaruhi kapasitas tension dan shear dari anchor.