desain angkur bolt
DESCRIPTION
Desain Angkur BoltTRANSCRIPT
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Anchor Bolt Capacity
According to ACI 318M-05
Appendix D
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Introduction
• Batasan maximum fc’ yang diatur dalam ACI 318 adalah 70 MPauntuk cast-in anchor dan 55 MPa untuk post-installed anchor
• Load combination menggunakan Ultimate Strength Design
• Strength reduction factor (Ø)
Tension 0.80
Shear 0.75
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General Requirement for Strenght of anchor
• Tension
1. Steel Strength of Anchor in Tension
2. Concrete Breakout Strength of Anchor
3. Pullout Strength in Anchor
4. Concrete Side-Face Blow Out
• Shear
1. Steel Strength of Anchor in Shear
2. Concrete Breakout Strength of Anchor
3. Concrete Pryout Strength of Anchor
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Steel Strenght of Anchor in Tension
Kapasitas Anchor Bolt dihitung berdasarkan
rumus berikut :
NSA = n.Ase.futa
n : jumlah anchor
Asa : area of anchor bolt
futa : min (1.9fya or 860 MPa)
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Concrete Breakout Strength of Anchor in Tension
Rumus kapasitas breakout strength adalah sebagai berikut
Single Anchor :
Group Anchor :
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Concrete Breakout Strength of Anchor in Tension
Dimana :
ANC : projected concrete failure area of single anchor group
ANCO : projected concrete failure area of single anchor with an edge distance equal to 1.5hef
Nb : basic concrete breakout strength of single anchor in tension
Ψed,N : modification factor for edge effect
Ψc,N : modification factor for no cracking effect on service load
Ψcp,N : modification factor for post installed anchor. For cast in taken 1.0
Ψec,N : modification factor for anchor group loaded eccentrically in tension
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Concrete Breakout Strength of Anchor in Tension
Perhitungan Nb :
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Concrete Breakout Strength of Anchor in Tension
Calculate ANCO
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Concrete Breakout Strength of Anchor in Tension
Calculate AN
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Concrete Breakout Strength of Anchor in Tension
Calculate AN jika jarak ke pinggir anchor bolt kurang dari 1.5hef
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Pull out strength of anchor in tension
Nominal Pullout Strength
For concrete indicate no cracking
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Concrete Side-Face Blow Out in Tension
Single bolt capacity :
Group bolt capacity :
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Steel Strength Anchor in Shear
Capacity of Single Bolt :
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Concrete Breakout Strength Anchor in Shear
Capacity of Single Bolt :
Capacity of Group Bolt :
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Concrete Breakout Strength of Anchor in Shear
Dimana :
AVC : projected concrete failure area of single anchor group
AVCO : projected concrete failure area of single anchor with an edge distance equal to 1.5hef
Vb : basic concrete breakout strength of single anchor in shear
Ψed,V : modification factor for edge effect
Ψc,V : modification factor for no cracking effect on service load
Ψec,V : modification factor for anchor group loaded eccentrically in tension
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Concrete Breakout Strength of Anchor in Shear
Perhitungan Vb :
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Concrete Breakout Strength of Anchor in Shear
Calculate AVCO
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Concrete Breakout Strength of Anchor in Shear
Calculate AVC
Calculate AVC on edge
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Concrete Breakout Strength of Anchor in Shear
Calculate AVC on group of anchor
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Concrete Breakout Strength of Anchor in Shear
Calculate AVC if distance bolt to edge is very deep
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Concrete Pryout Strength Anchor in Shear
Capacity of Single Bolt :
Capacity of Group Bolt :
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Shear and Tension Interaction
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Kesimpulan
Selain dengan kedalaman anchor, jarak antar anchor dan jarak anchor ke pinggir beton mempengaruhi kapasitas tension dan shear darianchor.