How to calculate the pull-out force of steel bar

1. The uplift bearing capacity of the pile mainly depends on the material strength of the pile body, the uplift lateral resistance between the pile and soil, and the self weight of the pile body, but has no relationship with the reinforcement cage. It can be calculated according to the pile foundation specification.

2. The uplift bearing capacity of the pile mainly depends on the material strength of the pile body, the uplift lateral resistance between the pile and soil, and the self weight of the pile body, but has no relationship with the reinforcement cage. It can be calculated according to the pile foundation specification
calculation formula of reinforcement for pier column of reinforced pile foundation
No.1 reinforcement: number of one pier column: π×( 150-4 × 2) ÷ 11.5-1 = 38

number of bridges: 38 × 20 = 760, total length: (20683.2 + 212.4) × 20 × 38 = 9473.86m
total weight: 9473.86 × 3.85 = 36474.3kg

No.2 steel bar: length of each bar: π× 133.5 + 13 = 10807.5px
number of bridges: 16 × 4+5 × 2+4 × 2+3 × 2 = 108
total length: 4.323 × 108 = 466.88m total weight: 466.88 × 3.85 = 1797.5kg

No.3 steel bar: average length of each bar:
(3.14 × 146.5+3.14 ×( 146.5+3.53)
+3.14 ×( 146.5+3.53 × 2)
+3.14 ×( 146.5+3.53 × 3)
+3.14 ×( 146.5+3.53 × 4)
+3.14 ×( 146.5+3.53 × 5)
+3.14 ×( 146.5+3.53 × 6)
+3.14 ×( 146.5+3.53 × 7)
+3.14 ×( 146.5+3.53 × 8)
+3.14 ×( 146.5+3.53 × 9)
+10 × 5) ÷ 10
= 12880.000000000001px
number of bridges: 10 × 20 = 200
total length: 515.2 × 200 = 1030.40m total weight: 1030.40 × 0.617 = 635.8kg

No.4 reinforcement: length of left side of No.1 pier:
√ π× 1.43)2+0.12 ×( one hundred and ninety ÷ 2)+√( π× 1.43)2+0.22 ×[( 1127.9-190 × 2) ÷ 20]+ π× one point four three × 2 = 347.921m, average length 810710px, total 32428.4 × 20 = 6485.67m, total weight 6485.67 × 0.617 = 4001.7kg

No.6 steel bar: length of each steel bar: π× 155.5 + 14 = 12565px
number of piles: number of piles 1: [(66-52) - 1.4] ÷ two × 4 = 24; No.2, 3 and 4 reinforcement are the same as No.1

No.5 left reinforcement: [(69-55) - 1.4] ÷ two × 2 = 12

No.5 right reinforcement: [(71-55) - 1.4] ÷ two × 2 = 14
total: 24 × 4 + 12 + 14 = 122, total length: 122 × 5.026 = 613.17m total weight: 613.17m × 4.83 = 2961.6kg

No.7 steel bar: length of each bar: 134.7 × 3 = 10102.5px, 122 pieces are the same as No. 6 steel bar
total length: 122 × 4.041 = 493.002m total weight: 493.002 × 4.83 = 2381.2kg

No.8 steel bar: 1582712.5px 63308.5px × 20=12661.7m
12661.7 × 0.617 = 7812.3kg

No.9 reinforcement: length of each reinforcement: 30 + x2 = 1197.5px
number of the whole bridge: 122 × 4 = 488, total length: 488 × 479 = 233.752m total weight: 233.752 × 1.58=369.3kg

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5. The standard value of the tensile strength of 10 mm diameter steel bar by post planting method is the yield strength of the steel bar
the design strength of general reinforcement is 0.9 times of yield strength; It is qualified if the standard value of tensile strength test of post planting method is not less than the yield strength value
the yield strength of hpb300 steel bar is 300mpa, the design strength is 270MPa
the yield strength of HRB335 steel bar is 335mpa, the design strength is 300mpa
the yield strength of HRB400 steel bar is 400MPa, the design strength is 360MPa
the sectional area of 10mm diameter steel bar is 5 × five × 3.14 = 78.5m2
hpb300 diameter 10mm reinforcement yield strength tensile value: 300 × 78.5 = 23550n = 23.55kn
HRB335 the tensile value of yield strength of 10mm diameter reinforcement is 335 × 78.5 = 26298n = 26.30kn
hpb400 the tensile value of yield strength of 10mm diameter reinforcement is 400 × 78.5=31400N=31.40KN

6. 380n, and the sum of the three values is the pullout resistance
steel bar: steel bar (also known as corrugated steel) is a kind of steel strip, which is a kind of building materials. For example, in reinforced concrete, it is used to support the skeleton of the structure. Including round steel bar, ribbed steel bar and torsion steel bar. There are many kinds of steel bars, which are usually classified according to the chemical composition, proction process, rolling shape, supply form, diameter and use in the structure. The steel bar mainly bears tensile stress in concrete. Due to the role of rib, the deformed steel bar has a greater bonding capacity with concrete, so it can better bear the effect of external force. Steel bars are widely used in various building structures, especially in large, heavy, light thin-walled and high-rise buildings.

7. The pull-out force is determined by the pull-out test.

8. The pull-out force of steel bar with diameter 12 on C25 concrete depends on the connection mode between steel bar and concrete, but it is also related to the grade of steel bar
1. If the anchorage meets the specification, whether it is straight anchor or elbow anchor, the pull-out force is the tensile failure strength of the reinforcement
2. If it is post planting, it depends on the planting technology, construction level and planting glue grade
3. This is not a fixed value, and there will be a large error

rebar refers to the steel used for reinforced concrete and prestressed reinforced concrete. Its cross section is circular, sometimes square with rounded corners. Including round steel bar, ribbed steel bar and torsion steel bar. The steel bar for reinforced concrete refers to the straight or coiled steel bar for reinforced concrete reinforcement. Its shape is divided into plain round steel bar and deformed steel bar, and the delivery status is straight bar and coiled steel bar.

9. a. In general, after 72 hours of planting reinforcement, the tension meter (Jack) can be used to carry out the pull-out test on the planted reinforcement, and the loading method is shown in the right figure. In order to rece the restriction of the jack on the concrete near the anchor bar, the channel steel or support is used for overhead, and the distance of the fulcrum is greater than or equal to max (3D, 60mm). Then, it is loaded at a constant speed for 2-3 minutes (or graded loading) until failure. The failure mode can be divided into three types: reinforcement failure (reinforcement breaking), cross-section failure (reinforcement pulling out along the interface of structural glue and reinforcement), mixed failure (upper concrete cone failure, lower pulling out along the interface of structural glue and concrete)
B. as a non-destructive test, the maximum loading value can be 0.95asfyk
C. The quantity of spot check can be determined by 0.1% of the quantity of each kind of reinforcement, but it should not be less than 3.