Checking of AnchorsInputStringer Di

Checking of Anchors

Input
Stringer
Dimension : H200x200x10mm
Section Area : 5800mm2
Material : Steel CT3
Calculated tensile strength : 200 000kPa
Pin
Dimension : Circular section of 50mm dia.
Material : Steel
Ultimate tension strength : min 475 0000kPa
Calculated shearing strength : 190 000kPa

Anchored bolts
Dimension : 04 bolts of 40mm dia.
Material : Steel
Ultimate tension strength : min 475 0000kPa
Calculated tensile strength : 190 000

Wall bearing anchors
Material : Conrete #300
Thickness of wall : 200mm
Calculated shear strength : 1000kPa

Calculation Of Tensile Capacity Of 01 Stringer Anchors


Fig.8 Stringer anchors
Tensile capacity of stringer
Tensile capacity of stringer can be estimated as follows :

[F]stringer = Astringer x fstringer x  = 5800/1000000 x 200 000 x 0.95 = 1102 kN

Where : Astringe – Cross section of stringer, A = 5800mm2
fstringer - Calculated tensile strength of stringer material, fstringer = 200 0000kPa
- Coefficient related to working conditions
Shearing capacity of pin
Pin are arranged to connect stringer to tower crane column and concrete wall. Shearing capcity of pin can be estimated as follows :
[F]pin = dpin2 x  /4 x fpin
= (502 x 3.14/4) x 190 000/1000000 = 373.06 kN

Where : dpin – Diameters of pin, d = 50mm2
fpin - Calculated shearing strength of pin material, fpin = 200 0000kPa
Tensile capacity of bolts

Bolts are arranged to connect stringer to concrete wall. Tensile capcity of bolts can be estimated as follows :
[F] 4bolts = 4x d1bolts2 x  /4 x fbolts
= 4 x (402 x 3.14/4) x 190 000/1000000 = 954.56 kN
[F] 6bolts = 6x d1bolts2 x  /4 x fbolts
= 6 x (402 x 3.14/4) x 190 000/1000000 = 1431.84 kN


Where : dbolts – Diameters of pin, d = 40mm2
Fbolts - Calculated shearing strength of pin material, fbolts = 190 0000kPa
Punching capacity of concrete wall


Fig.9 Potential failure plane of concrete wall

Punching capacity of concrete wall can be estimated as follows :
[F]wall, 4bolts = Afailure plane x fconcrete = "4×0.35+4×0.75" /"2" " ×" ("0.2" √("2" ))" ×1000" = 622.25 kN
[F]wall, 6bolts = Afailure plane x fconcrete = "(2×0.35+2×0.7)+(2×0.75+2×1.1)" /"2" " ×" ("0.2" √("2" ))" ×1000" = 820.24 kN

Where : Afailureplane – Surface area of failure plane
fconcrete – Shearing strength of concrete, fconcrete = 1000kPa
Tensile capacity of 01 stringer anchor

Tensile capacity of 01 anchor is the minimum value of capacities of stringers, pins, anchored bolts, concrete wall and equal of 373.06 kN

Capacity Calculation Of 01 Anchor Groups

The anchor group can be presented in Fig.10.


Fig.10 Anchor group in Block A and B

Calculated results of anchor group capacity against horizontal force at Block A, B , C are shown in Table 4, 5 and 6

Table 4 Capacity of anchor group against horizontal force at Block A
Force Tensile capacity
of 1 stringer anchor (kN) Angle Capacity of anchor group
against horizontal force
direction a direction b direction c direction d
T1 373.06 =56 309.28 208.61 366.21 71.18
T2 373.06  =48 277.24 249.63 372.55 19.52
T3 373.06  =73 356.76 109.07 175.14 329.39
Total 943.28 567.31 913.90 420.10


Table 5 Capacity of anchor group against horizontal force at Block B
Force Tensile capacity
of 1 stringer anchor (kN) Angle Capacity of anchor group
against horizontal force
direction a direction b direction c direction d
T1 373.06 =64 335.30 163.54 352.74 121.46
T2 373.06  =52 293.98 229.68 370.28 45.46
T3 373.06  =43 254.43 272.84 13.02 372.83
Total 883.71 666.06 736.03 539.75

Table 6 Capacity of anchor group against horizontal force at Block C
Force Tensile capacity
of 1 stringer anchor (kN) Angle Capacity of anchor group
against horizontal force
direction a direction b direction c direction d
T1 373.06 =67 343.40 145.77 345.90 139.75
T2 373.06  =52 293.98 229.68 45.46 370.28
T3 373.06  =62 329.39 175.14 109.07 356.76
Total 966.77 550.59 500.43 866.79

From the results in Table 4, 5 and 6 and results of structural analysis (Fig.4), it indicates that the capacity anchor group against horizontal force (min 420.10kN) is greater than horizontal force of 394.02 kN