Why is it so difficult to calculate the number of steel bars? "

Because the steel bars are counted one by one, and a house needs a lot of steel bars, it needs to be summarized in the end.

Calculation principle and method of reinforcement

Reinforcement weight = reinforcement length * reinforcement quantity * theoretical weight

Reinforcement length = net length+node anchorage+lap joint+hook (first-class earthquake resistance)

pillar; mainstay

Foundation layer: when the raft foundation is < = 2000 mm, the length of foundation reinforcement = the height of foundation layer-protective layer+foundation bending a+ exposed length of foundation longitudinal reinforcement HN/3+ overlapping length of upper longitudinal reinforcement LLE (if welded, the overlapping length is 0).

Raft foundation > 〉2000mm, length of foundation steel dowel = height of foundation layer by layer /2- protective layer+foundation bending a+ exposed length of foundation longitudinal reinforcement HN/3+ overlapping length LLE of foundation longitudinal reinforcement (if welded, the overlapping length is 0).

Basement: Length of column longitudinal reinforcement = height of basement-clear height of HN of this floor /3+ clear height of HN of the first floor /3+ overlapping with longitudinal reinforcement of LLE of the first floor (if welded, the overlapping length is 0).

First floor: column longitudinal reinforcement length = height of the first floor-HN clear height of the first floor /3+max (HN clear height of the second floor /6500, column section side length (cylinder diameter))+length LLE of overlap with the longitudinal reinforcement of the second floor (for example, when welding, the overlap length is 0).

Middle layer: length of column longitudinal rib = two-layer height -max (two-layer height HN/6500, column section size (cylinder diameter)) +max (three-layer height HN/6500, column section size (cylinder diameter))+three-layer LLE (if welded, the lap length is 0).

Top floor:

Corner column: external reinforcement length = top height-max (HN clear height of this layer /6500, column section length (cylinder diameter))-beam height+1.5lae.

Length of internal reinforcement = height of top floor-maximum (HN clear height of this floor /6500, column section length (column diameter))-beam height +LAE.

Anchor length value:

When the diameter of the column longitudinal reinforcement extending into the beam is long, the bending anchor is adopted. After the longitudinal reinforcement of the column extends to the top of the column, it bends 12d, and the anchoring length = beam height-protective layer+12d; When the diameter and length of the column longitudinal reinforcement extending into the beam > = LAE, the straight anchor is adopted: the column longitudinal reinforcement is cut off after reaching the top of the column, and the anchoring length = beam height-protective layer,

When the cross section of the frame column is rectangular, the number of external reinforcement is: 3 angle steel, 1/2 of the total number of reinforcement on the B side and 1/2 of the total number of reinforcement on the H side.

The number of reinforcement inside is: 1 corner reinforcement, total reinforcement of side b 1/2, and total reinforcement of side h 1/2.

Side column: length of external reinforcement = height of top floor-max (HN clear height of this floor /6500, column section length (cylinder diameter))-beam height+1.5lae.

Length of internal reinforcement = height of top floor-maximum (HN clear height of this floor /6500, column section length (column diameter))-beam height +LAE.

When the cross section of the frame column is rectangular, the number of external reinforcement is: 2 corner reinforcement, and the total number of reinforcement on the B side.

The number of internal steel bars is: 2 corner steel bars, the total number of steel bars on one side of B surface and the total number of steel bars on both sides of H surface.

Central column: longitudinal reinforcement length = top height-maximum (HN clear height of this layer /6500, column section length (cylindrical diameter))-beam height+anchorage.

Anchor length value:

When the diameter of the column longitudinal reinforcement extending into the beam is long, the bending anchor is adopted. After the longitudinal reinforcement of the column extends to the top of the column, it bends 12d, and the anchoring length = beam height-protective layer+12d; When the diameter and length of the column longitudinal reinforcement extending into the beam > = LAE, the straight anchor is adopted: the column longitudinal reinforcement is cut off after reaching the top of the column, and the anchoring length = beam height-protective layer,

light

Plane representation of beam:

Centralized labeling-

1, beam number

2, section size

3. stirrup

4, the upper wear through steel bar or erection of steel bar.

5. Transverse and longitudinal structural reinforcement or torsion reinforcement

6, beam top elevation difference

In-situ labeling

7, beam bearing upper reinforcement

8, beam bottom reinforcement

9, steel hanger, additional reinforcement and structural reinforcement

Reinforcement formula

Upper length rod: length = clear span length+left bearing anchorage+right bearing anchorage.

When hc- protective layer (length of straight anchor) >: =LaE, take Max(LaE, 0.5hc+5d+5d).

Hc- protective layer (length of straight anchor)

Algorithm 1:HC- protective layer ++ 15d.

Algorithm 2: Take 0.4LAE+ 15d.

Algorithm 3: Take Max(LaE, hc- protective layer ++ 15d).

Algorithm 4: Take Max (LAE, 0.4LAE+ 15d).

Negative reinforcement of left and right bearings:

Length of the first row = left or right bearing anchorage+clear span length /3

Length of the second row = left or right bearing anchorage+clear span length /4

If the third row of steel bars extends into the span 1/5, if there are * * * two rows, the first row is full-length steel bars, then the second row is calculated as LN/3.

Length of negative reinforcement of intermediate support

Upper row length =2* clear span length /3+ bearing width

Lower row length =2* clear span length /4+ bearing width

Note: The net span length is a long span from left to right.

Poling length = clear distance-left negative reinforcement length-right negative reinforcement length+150*2

Note: When the through bars and vertical bars exist at the same time, the overlap value is150 mm. ..

Structural reinforcement length = clear span length +2* 15d

Torsion bar length = clear span length +2* anchorage length

Support length = Liang Kuan -2* protection +2 * 1.9d+2 * maximum (10d, 75mm).

Number of roots = (net span length -50*2)/ unencrypted spacing *2+ 1* lines.

When the Liang Kuan is less than or equal to 350, the lacing diameter is 6mm；; Liang Kuan > 350, the diameter of lacing is 8 mm, and the spacing of lacing in non-encrypted area is twice that of stirrup. When there are multiple rows of braces, the upper and lower rows of braces are vertically staggered.

Lower reinforcement

Lower reinforcement length = clear span length+left bearing anchorage+right bearing anchorage.

The length of the steel bar whose lower part does not extend into the bearing = clear span length -0. 1*2* clear span length.

Length of lower non-penetrating reinforcement = clear span length+left bearing anchorage+right bearing anchorage

Stirrup length = (Liang Kuan-protective layer * 2+ beam height-protective layer) * 2+1.9d * 2+max (10d, 75mm) * 2.

Root number = 2 * (encrypted area length -50)/ encrypted area+1+ (unencrypted area length/unencrypted area-1)

The encryption length is max(2* beam height, 500) when the structure is seismic grade I, and max( 1.5* beam height, 500) when the structure is seismic grade II to IV.

Length of steel hanger = 2 * anchorage +2* inclined section length+width of secondary beam +2*50.

Angle of inclined section: the height of main girder > 800mm a is 60 degrees.

Height of main girder

board

Bottom reinforcement length = net length +2 * maximum (bearing width/2,5d)+2 * 6.25m (first-class reinforcement)+lap joint.

Number of roots = (net length -2*50)/ spacing+1

Gluten length = net length +2*la+2*6.25d (Grade I rebar)+lap joint.

Number of roots = (net length -2*50)/ spacing+1

La: non-seismic; Lae: earthquake resistance

Length of end-bearing negative reinforcement = net length +la+6.25d+ (thickness -2* protective layer)

Number of roots = (net length -2*50)/ spacing+1

Negative reinforcement length of middle support = left clear length+right clear length +2* (thickness -2* protective layer)

Number of roots = (net length -2*50)/ spacing+1

Distribution reinforcement length = net length-exposed length of negative reinforcement at both ends +2* 150.

Number of roots = left label/spacing+right label/spacing (without decreasing the starting distance, without adding 1, without decreasing 1)

Temperature reinforcement length = net length-exposed length of negative reinforcement at both ends +2* 150+2*6.25d (Grade I reinforcement)

Number of roots = (clear length-exposed length of negative reinforcement at both ends)/spacing-1 (without reducing the starting distance, without adding 1, minus 1)

Opening in the plate: the length of the left end of the hole = net length-protective layer +max (bearing width/2,5d)+6.25d+(plate thickness -2* protective layer) +5d.

Length of right end of hole: same as left end.

Root number = hole width/spacing+1

Cantilever: Cantilever length (one end in the column) = clear length +la+ (thickness -2* protective layer) +6.25d (first-class reinforcement).

Cantilever length (both ends are in the plate) = (plate thickness -2* protective layer)+clear length+(plate thickness -2* protective layer) +5d.

Calculation of reinforcement of shear wall

1, reinforcement calculation of concealed column

(a) Calculate the length of longitudinal reinforcement: middle layer:

When binding connection is adopted, length = height+1.2lae; When using mechanical connection (such as straight thread sleeve), length = height -500+500.

(b) Top floor:

When binding connection is adopted, length = height -500- thickness+LAE; When using mechanical connection (such as straight thread sleeve), length = height -500- thickness +Lae.

(c) Quantity of longitudinal reinforcement: According to the drawings.

(d) stirrup calculation: (Liang Kuan+beam height -4 * protective layer) * 2+11.9 * d * 2+8 * d.

(e) Support length: wall thickness-protective layer * 2+2d+1.9d * 2+max (7510d) * 2.

Number of roots: story height/lacing distance+1 (end column is the same as concealed column)

(2) the hidden beam in the shear wall; Length of longitudinal reinforcement of concealed beam = clear length of concealed beam+anchorage at both ends:

(3) stirrup length = dark Liang Kuan+dark beam height) *2-8* protective layer+8 * d+2 *11.9 * d; Number of stirrups = clear length/spacing of concealed beam+1

(4) Coupling beam in shear wall

Length of longitudinal reinforcement of coupling beam = hole width+maximum anchorage length on left and right sides (Lae, 600)

The number of stirrups in the middle coupling beam = (hole width -50 * 2)/ stirrup spacing+1.

The number of stirrups of top coupling beam (when both ends are straight anchors) = (hole width -50 * 2/ stirrup spacing+1)+ (straight length of coupling beam anchorage-100/150+1) * 2.

Coupling beam stirrup length = (Liang Kuan+beam height -4 * protective layer) * 2+11.9 * d * 2+8 * d.

(5) Brace length = Liang Kuan-protective layer+2 *11.9 * d+2 * d; Root number = number of rows * (hole width-100)/ spacing)

2, the wall horizontal reinforcement (wall end for the hidden column)

Transverse reinforcement = wall length-protective layer; Internal reinforcement = wall length-protective layer+15d

Number of roots: height/spacing+1 (horizontal reinforcement of concealed beam and connecting beam wall)

Horizontal reinforcement of wall (end column at wall end)

Transverse reinforcement = wall length-protective layer; Internal reinforcement = net length of wall+anchorage length (bending anchor, straight anchor)

Root number = height/spacing+1 (horizontal reinforcement in concealed beam and coupling beam is set as required)

Calculation of longitudinal reinforcement of wall

Foundation steel dowel = bending length a+ anchorage vertical length h 1+ lap length 1.2LaE or unconnected area 500.

Longitudinal reinforcement of middle layer = height+lap length 1.2LaE or unconnected area 500.

Top longitudinal reinforcement = height-thickness+anchorage

Root number = (clear wall length (wall length-concealed column section length) -2*s/2)/ spacing

3. Vertical reinforcement of wall

(1) The number of steel bars vertically distributed on the wall = the net length of the wall-1 vertical spacing s/2 (or 2*50)/ vertical arrangement spacing+1.

The vertical distribution of reinforcement in the wall is arranged from the edge of concealed column or end column.

(2) If it is a hole, the number of roots shall be calculated by sections.

Relationship between wall beam reinforcement and wall reinforcement

When there is no provision in the design, the longitudinal reinforcement of the side structure and the shear wall are horizontally distributed; Diameter of lacing: 6mm when Liang Kuan ≤ 350, 8mm when Liang Kuan >: 350, and spacing of lacing is twice that of stirrup; When the cross section height of coupling beam is >: 700, the diameter of transverse and longitudinal structural steel bars should be ≥ 10mm, and the spacing should be ≤ 200;

Calculation principle of reinforcement

Reinforcement weight = reinforcement length * reinforcement quantity * theoretical weight

Reinforcement length = net length+node anchorage+lap joint+hook (first-class earthquake resistance)

pillar; mainstay

Foundation layer: when the raft foundation is < = 2000 mm, the length of foundation reinforcement = the height of foundation layer-protective layer+foundation bending a+ exposed length of foundation longitudinal reinforcement HN/3+ overlapping length of upper longitudinal reinforcement LLE (if welded, the overlapping length is 0).

Raft foundation > 〉2000mm, length of foundation steel dowel = height of foundation layer by layer /2- protective layer+foundation bending a+ exposed length of foundation longitudinal reinforcement HN/3+ overlapping length LLE of foundation longitudinal reinforcement (if welded, the overlapping length is 0).

Basement: Length of column longitudinal reinforcement = height of basement-clear height of HN of this floor /3+ clear height of HN of the first floor /3+ overlapping with longitudinal reinforcement of LLE of the first floor (if welded, the overlapping length is 0).

First floor: column longitudinal reinforcement length = height of the first floor-HN clear height of the first floor /3+max (HN clear height of the second floor /6500, column section side length (cylinder diameter))+length LLE of overlap with the longitudinal reinforcement of the second floor (for example, when welding, the overlap length is 0).

Middle layer: length of column longitudinal rib = two-layer height -max (two-layer height HN/6500, column section size (cylinder diameter)) +max (three-layer height HN/6500, column section size (cylinder diameter))+three-layer LLE (if welded, the lap length is 0).

Top floor:

Corner column: external reinforcement length = top height-max (HN clear height of this layer /6500, column section length (cylinder diameter))-beam height+1.5lae.

Length of internal reinforcement = height of top floor-maximum (HN clear height of this floor /6500, column section length (column diameter))-beam height +LAE.

Anchor length value:

When the diameter of the column longitudinal reinforcement extending into the beam is long, the bending anchor is adopted. After the longitudinal reinforcement of the column extends to the top of the column, it bends 12d, and the anchoring length = beam height-protective layer+12d; When the diameter and length of the column longitudinal reinforcement extending into the beam > = LAE, the straight anchor is adopted: the column longitudinal reinforcement is cut off after reaching the top of the column, and the anchoring length = beam height-protective layer,

When the cross section of the frame column is rectangular, the number of external reinforcement is: 3 angle steel, 1/2 of the total number of reinforcement on the B side and 1/2 of the total number of reinforcement on the H side.

The number of reinforcement inside is: 1 corner reinforcement, total reinforcement of side b 1/2, and total reinforcement of side h 1/2.

Side column: length of external reinforcement = height of top floor-max (HN clear height of this floor /6500, column section length (cylinder diameter))-beam height+1.5lae.

Length of internal reinforcement = height of top floor-maximum (HN clear height of this floor /6500, column section length (column diameter))-beam height +LAE.

When the cross section of the frame column is rectangular, the number of external reinforcement is: 2 corner reinforcement, and the total number of reinforcement on the B side.

The number of internal steel bars is: 2 corner steel bars, the total number of steel bars on one side of B surface and the total number of steel bars on both sides of H surface.

Central column: longitudinal reinforcement length = top height-maximum (HN clear height of this layer /6500, column section length (cylindrical diameter))-beam height+anchorage.

Anchor length value:

When the diameter of the column longitudinal reinforcement extending into the beam is long, the bending anchor is adopted. After the longitudinal reinforcement of the column extends to the top of the column, it bends 12d, and the anchoring length = beam height-protective layer+12d; When the diameter and length of the column longitudinal reinforcement extending into the beam > = LAE, the straight anchor is adopted: the column longitudinal reinforcement is cut off after reaching the top of the column, and the anchoring length = beam height-protective layer,

light

Plane representation of beam:

Centralized labeling-

1, beam number

2, section size

3. stirrup

4, the upper wear through steel bar or erection of steel bar.

5. Transverse and longitudinal structural reinforcement or torsion reinforcement

6, beam top elevation difference

In-situ labeling

7, beam bearing upper reinforcement

8, beam bottom reinforcement

9, steel hanger, additional reinforcement and structural reinforcement

Reinforcement formula

Upper length rod: length = clear span length+left bearing anchorage+right bearing anchorage.

When hc- protective layer (length of straight anchor) >: =LaE, take Max(LaE, 0.5hc+5d+5d).

Hc- protective layer (length of straight anchor)

Algorithm 1:HC- protective layer ++ 15d.

Algorithm 2: Take 0.4LAE+ 15d.

Algorithm 3: Take Max(LaE, hc- protective layer ++ 15d).

Algorithm 4: Take Max (LAE, 0.4LAE+ 15d).

Negative reinforcement of left and right bearings:

Length of the first row = left or right bearing anchorage+clear span length /3

Length of the second row = left or right bearing anchorage+clear span length /4

If the third row of steel bars extends into the span 1/5, if there are * * * two rows, the first row is full-length steel bars, then the second row is calculated as LN/3.

Length of negative reinforcement of intermediate support

Upper row length =2* clear span length /3+ bearing width

Lower row length =2* clear span length /4+ bearing width

Note: The net span length is a long span from left to right.

Poling length = clear distance-left negative reinforcement length-right negative reinforcement length+150*2

Note: When the through bars and vertical bars exist at the same time, the overlap value is150 mm. ..

Structural reinforcement length = clear span length +2* 15d

Torsion bar length = clear span length +2* anchorage length

Support length = Liang Kuan -2* protection +2 * 1.9d+2 * maximum (10d, 75mm).

Number of roots = (net span length -50*2)/ unencrypted spacing *2+ 1* lines.

When the Liang Kuan is less than or equal to 350, the lacing diameter is 6mm；; Liang Kuan > 350, the diameter of lacing is 8 mm, and the spacing of lacing in non-encrypted area is twice that of stirrup. When there are multiple rows of braces, the upper and lower rows of braces are vertically staggered.

Lower reinforcement

Lower reinforcement length = clear span length+left bearing anchorage+right bearing anchorage.

The length of the steel bar whose lower part does not extend into the bearing = clear span length -0. 1*2* clear span length.

Length of lower non-penetrating reinforcement = clear span length+left bearing anchorage+right bearing anchorage

Stirrup length = (Liang Kuan-protective layer * 2+ beam height-protective layer) * 2+1.9d * 2+max (10d, 75mm) * 2.

Root number = 2 * (encrypted area length -50)/ encrypted area+1+ (unencrypted area length/unencrypted area-1)

The encryption length is max(2* beam height, 500) when the structure is seismic grade I, and max( 1.5* beam height, 500) when the structure is seismic grade II to IV.

Length of steel hanger = 2 * anchorage +2* inclined section length+width of secondary beam +2*50.

Angle of inclined section: the height of main girder > 800mm a is 60 degrees.

Height of main girder

board

Bottom reinforcement length = net length +2 * maximum (bearing width/2,5d)+2 * 6.25m (first-class reinforcement)+lap joint.

Number of roots = (net length -2*50)/ spacing+1

Gluten length = net length +2*la+2*6.25d (Grade I rebar)+lap joint.

Number of roots = (net length -2*50)/ spacing+1

La: non-seismic; Lae: earthquake resistance

Length of end-bearing negative reinforcement = net length +la+6.25d+ (thickness -2* protective layer)

Number of roots = (net length -2*50)/ spacing+1

Negative reinforcement length of middle support = left clear length+right clear length +2* (thickness -2* protective layer)

Number of roots = (net length -2*50)/ spacing+1

Distribution reinforcement length = net length-exposed length of negative reinforcement at both ends +2* 150.

Number of roots = left label/spacing+right label/spacing (without decreasing the starting distance, without adding 1, without decreasing 1)

Temperature reinforcement length = net length-exposed length of negative reinforcement at both ends +2* 150+2*6.25d (Grade I reinforcement)

Number of roots = (clear length-exposed length of negative reinforcement at both ends)/spacing-1 (without reducing the starting distance, without adding 1, minus 1)

Opening in the plate: the length of the left end of the hole = net length-protective layer +max (bearing width/2,5d)+6.25d+(plate thickness -2* protective layer) +5d.

Length of right end of hole: same as left end.

Root number = hole width/spacing+1

Cantilever: Cantilever length (one end in the column) = clear length +la+ (thickness -2* protective layer) +6.25d (first-class reinforcement).

Cantilever length (both ends are in the plate) = (plate thickness -2* protective layer)+clear length+(plate thickness -2* protective layer) +5d.

Calculation of reinforcement of shear wall

1, reinforcement calculation of concealed column

(a) Calculate the length of longitudinal reinforcement: middle layer:

When binding connection is adopted, length = height+1.2lae; When using mechanical connection (such as straight thread sleeve), length = height -500+500.

(b) Top floor:

When binding connection is adopted, length = height -500- thickness+LAE; When using mechanical connection (such as straight thread sleeve), length = height -500- thickness +Lae.

(c) Quantity of longitudinal reinforcement: According to the drawings.

(d) stirrup calculation: (Liang Kuan+beam height -4 * protective layer) * 2+11.9 * d * 2+8 * d.

(e) Support length: wall thickness-protective layer * 2+2d+1.9d * 2+max (7510d) * 2.

Number of roots: story height/lacing distance+1 (end column is the same as concealed column)

(2) the hidden beam in the shear wall; Length of longitudinal reinforcement of concealed beam = clear length of concealed beam+anchorage at both ends:

(3) stirrup length = dark Liang Kuan+dark beam height) *2-8* protective layer+8 * d+2 *11.9 * d; Number of stirrups = clear length/spacing of concealed beam+1

(4) Coupling beam in shear wall

Length of longitudinal reinforcement of coupling beam = hole width+maximum anchorage length on left and right sides (Lae, 600)

The number of stirrups in the middle coupling beam = (hole width -50 * 2)/ stirrup spacing+1.

The number of stirrups of top coupling beam (when both ends are straight anchors) = (hole width -50 * 2/ stirrup spacing+1)+ (straight length of coupling beam anchorage-100/150+1) * 2.

Coupling beam stirrup length = (Liang Kuan+beam height -4 * protective layer) * 2+11.9 * d * 2+8 * d.

(5) Brace length = Liang Kuan-protective layer+2 *11.9 * d+2 * d; Root number = number of rows * (hole width-100)/ spacing)

2, the wall horizontal reinforcement (wall end for the hidden column)

Transverse reinforcement = wall length-protective layer; Internal reinforcement = wall length-protective layer+15d

Number of roots: height/spacing+1 (horizontal reinforcement of concealed beam and connecting beam wall)

Horizontal reinforcement of wall (end column at wall end)

Transverse reinforcement = wall length-protective layer; Internal reinforcement = net length of wall+anchorage length (bending anchor, straight anchor)

Root number = height/spacing+1 (horizontal reinforcement in concealed beam and coupling beam is set as required)

Calculation of longitudinal reinforcement of wall

Foundation steel dowel = bending length a+ anchorage vertical length h 1+ lap length 1.2LaE or unconnected area 500.

Longitudinal reinforcement of middle layer = height+lap length 1.2LaE or unconnected area 500.

Top longitudinal reinforcement = height-thickness+anchorage

Root number = (clear wall length (wall length-concealed column section length) -2*s/2)/ spacing

3. Vertical reinforcement of wall

(1) The number of steel bars vertically distributed on the wall = the net length of the wall-1 vertical spacing s/2 (or 2*50)/ vertical arrangement spacing+1.

The vertical distribution of reinforcement in the wall is arranged from the edge of concealed column or end column.

(2) If it is a hole, the number of roots shall be calculated by sections.

Relationship between wall beam reinforcement and wall reinforcement

When there is no provision in the design, the longitudinal reinforcement of the side structure and the shear wall are horizontally distributed; Diameter of lacing: 6mm for Liang Kuan ≤ 350mm, 8mm for Liang Kuan > 350mm, and spacing of lacing is twice that of stirrup; When the cross section height of the coupling beam is >: 700mm, the diameter of the longitudinal structural steel bars on the side should be ≥ 10mm, and the spacing should be ≤ 200 mm ..