Calculation Note

                    Calculation Notes for Foundation of Silos  Tavouni Morghdaran Qum   

 

1. General  This Document is Included Structural calculation notes for Analysis & Design of  Foundation And required Structures of Ashkhaneh Silos Project. This Silos is  Located 6th Km of Ashkhaneh City.   In this phase of Project Design only 6 silos Foundation.  

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2. Codes and Standards  Iranian Seismic Code. ( 2800 Iranians Codes)   519 Iranians Codes.  Iranian Concrete Design Code. (ABA Code)  9th topic of Iranians’ National Building Codes.   General and Technical of Silo Construction.  3. Materials  3.1. Reinforcing Bars  Deformed high tensile strength Steel bars, with minimum yield  strength of 4200 kg/cm3 in accordance with ASTM A 615 or  approved equivalent.      3.2. Concrete  Tow Type of concrete are considered for the design of structures.  /

In analyses and Design,  is minimum compressive characteristic  strength at 28 days on cylinder Specimen. 

    

/ /

300  80 

2    2   

   

     

/

2.4 

 

  

 

    3 

4. Soil Parameter   According to geotechnical report, soil parameters are as following   30            0.25 

2 

2.1 

3 

2.75 

2 

5. Input Data  5.1. Muyang Group Data  5.1.1  Silo Diameters:  23650 millimeter (others data According the  figures).  

     

 

5.1.2 21 feet Silo Diameters:  6370 millimeter (others Data According  the  figures )   

 

6. Loading  6.1.1 Design loading data for silo Foundation design have been provided  from Muyang Group. 

 

  Main silo Load KN,m Roof deadweight (Line Load) Roof Live Load and grain friction  Grain vertical pressure 21 feet silo load Roof deadweight (Line Load) Roof Live Load and grain friction  Grain vertical pressure

13.5 KN/m 220 KN/m 170 KN/m2 5 KN/m 78 KN/m 64 KN/m2

 

6.1.2 The lateral loadings calculate as follow:  6.1.2.1 Wind Load Calculation: 6.1.2.1.1. Wind Load for 21 feet Silos: According To 519 Iranian Code P = Ce C q q q = 0.00005v 2

Ce = combined height, exposure and gust factor coefficient Cq = pressure coefficient for the structure or portion of structure

under consideration P = design wind pressure. v = wind stagnation pressure

v = 130 Km Ce = 2(

hr

ghoum station

z 0.16 ) ≥2 10

Wind Load Calculation: Ce

According To 519 Iranian Code 2

q = 0.00005 × 130 2 = 0.845 KN

P = Ce C q q q = 0.00005v 2

2.2

m2

pressure coefficient for silo with circle section: Cq = 0.8

P = CeCq q

High (meter) P (KN/m2)

0-10 1.352

10-20 1.487

0-10 86.12

10-20 94.73

Wind Force : F = P × A

High (meter) F (KN)

M wind = 1851.63KN .m Fwind = 180.85KN 6.1.2.1.2. Wind Load for Main Silos:

According To 519 Iranian Code P = CeCq q q = 0.00005v 2

Ce = combined height, exposure and gust factor coefficient Cq = pressure coefficient for the structure or portion of structure under consideration P = design wind pressure. v = wind stagnation pressure

v = 90 Km

Ce = 2(

hr

ghoum station

z 0.16 ) ≥2 10

High (meter)

0-10 2

Ce q = 0.00005 × 130 2 = 0.845 KN

10-20 2.2

20-30 2.4

m2

pressure coefficient for silo with circle section: Cq = 0.8

P = Ce C q q

High (meter) P (KN/m2)

0-10 1.352

10-20 1.487

20-30 1.622

0-10 319.75

10-20 351.68

20-30 276.2

Wind Force : F = P × A

High (meter) F (KN)

M wind = 12565.79 KN .m Fwind = 947.63KN

6.1.2.2 Earthquake Load Calculation: Design base shear: The total design base shear in a given direction shall be determined from the following formula According to 2800 Iranian Code V = C ×W A× B × I R A× B × I V= ×W R T0 23 B = 2.5( ) ≤ 2.5 T q T = 1.79h 2 gEI s C=

I = importance factor g = acceleration due to gravity. R = numerical coefficient representative of the inherent over strength and global ductility capacity of lateral forceresisting systems V = the total design lateral force or shear at the base W = the total seismic dead load E= Elastic modules of silo q= mass per length of silo A 0.3

I 1

R 5

B 2.5

T0

0.5

h 23.487

 

V = 0.15 × W

g 9.81

c 0.15

7. Load Combination : 7.1. Load Combination for Stability and Soil pressure check 1

.

.

2

.

3

.

4

.

5

0.9

.

0.71

. .

0.71

0.5

0.9

.

7.2. Load Combination Using Strength Design 1

1.4 

1.4

.

2

1.2 

1.2

.

1.6 

.

0.5 

3 1.2                                 0.8

1.2

.

1.6 

.

1.6

4 1.2                                 1.3

1.2

.

0.5 

.

0.5

5 1.32                                 1.1

1.32

.

0.55 

0.99

.

1.1

6

0.99 

7

1.4

8

1.05 

1.05

.

1.3

 9 1.05                                1.4 

1.05

.

1.3 

1.4

.

1.7 

.

.

0.22

1.7

.

8. Stability Check

Soil Weight : WSoil

⎡⎛ 25.052 19.052 ⎞ ⎛ 24.252 23.052 ⎞ ⎤ = ⎢⎜ π × −π × −π × ⎟ − ⎜π × ⎟ ⎥ × 2.2 × γ Soil = 7183KN 4 4 ⎠ ⎝ 4 4 ⎠⎦ ⎣⎝

0.4 = 1197.17 KN 2.4 2 WSoil 2 = 7183 × = 5985.83KN 2.4 ⎛ 24.252 23.052 ⎞ Concrete Wall Weight :WSoil = ⎜ π × −π × ⎟ × 2.7 × 25 = 3007.8KN 4 4 ⎠ ⎝ ⎛ 25.052 19.052 ⎞ Concrete Foundation Weight : ⎜ π × −π × ⎟ × 0.8 × 25 = 4156.4 KN 4 4 ⎠ ⎝ WSoil1 = 7183 ×

Silo Weight : 13.5 × π × 23.56 = 1003.03KN Grain Weight :170 × π ×

23.562 = 74679.45 KN 4

A- Wind Case Resist Moment =1197.17 ×12.325 + 5985.83 ×10.525 + 3007.8 ×11.825 +4156.4 ×11.025 + 1003.03 ×11.825 = 171008.36 KN .m F .S windCase =

M Re sist 171008.36 = = 13.6 12565.79 M Wind

B- Earthquake Case Resist Moment =171008.36 + 74679.45 ×12.525 = 1106368.47 KN .m F .S Earthquake =

M Re sist 1106368.47 = = 7.17 M Earthquake 154392.26

9. Analysis 0f Main Silos Foundation 9.1. Modeling Software Sap 2000 version 12.0.0 is used for Analyses purpose in this project. 9.2. Structural Geometry And Coding The 48 feet silo foundation is composed of two parts. First part is Ring wall and second part is footing.

9.3. Loading on Structure Silo.ope (KN)

Silo.emp (KN)

Wind Load (KN)

Earthquake Load (KN)

Dead Load (KN/m2)

Silo.ope Load (KN/m2)

9.4. Soil Bearing capacity check The soil bearing capacity will be checked as per allowable stress design method (Elastic condition) In the sap model, Soil condition simulated with spring element. (As shown on Figure)

According to The soil report the allowable soil pressure is:  2.75 

2 

Saps calculate the spring force and we can calculate the soil pressure under footing.

9.5. Ring wall Reinforcement calculation 9.5.1. Ring Wall Moment Resultant M1-1Diagram (Ton.m)

Resultant M2-2 Diagram (Ton.m)

9.5.2. Required Reinforcement for 1.0 m Width of Ring Wall.    0.85

1

1

.

.  

2 0.85

 

. .  

Item            (KN.m) c: concrete cover to foundation rebars center (mm) d: Effective depth of section (mm) ρ As : Reinforcing bar Area for 1 m width of foundation (mm2) Asmin : Minimum Reinforcing bar Area for 1m Width of foundation(mm2) Asreq : Required Reinforcing bar Area for 1m width of foundation (mm2) db : bar diameter (mm) Ase : Exisiting Area of rebars for 1m width of foundation (mm2) ρe : Exising steel ratio of foundation @ Use :

   

 

Bottem

Top

240 100 400 1667 0.00433 1731 2303 2303 22 1900 0.00475 200 Ok

240 100 400 1667 0.00433 1731 2303 2303 22 1900 0.00475 200 Ok

9.6. Footing Reinforcement Calculation 9.6.1. Footing Moment Resultant M1-1 Diagram (KN.m)

Resultant M2-2 Diagram (Ton.m)

9.6.2. Required Reinforcement for 1.0 m Width of Foundation.    0.85

1

1

.

.  

2 0.85

 

. .  

Item            (KN.m) c: concrete cover to foundation rebars center (mm) d: Effective depth of section (mm) ρ As : Reinforcing bar Area for 1 m width of foundation (mm2) Asmin : Minimum Reinforcing bar Area for 1m Width of foundation(mm2) Asreq : Required Reinforcing bar Area for 1m width of foundation (mm2) db : bar diameter (mm) Ase : Exisiting Area of rebars for 1m width of foundation (mm2) ρe : Exising steel ratio of foundation @ Use :

   

 

Bottem

Top

245 100 600 756 0.00192 1151 1531 1531 22 1900 0.00317 200 Ok

175 100 600 540 0.00136 818 1088 1088 16 1005 0.00167 200 Ok

10.Analysis  of 21 feet silos structures   10.1. Modeling Software Sap 2000 version 12.0.0 is used for Analyses purpose in this project. 10.2. Structural Geometry And Coding The 21 feet silos set on The Structure

10.3. Loading on Structure Silo.ope (KN)

Silo.emp (KN)

Wind Load (KN)

Earthquake Load (KN)

10.4. Column and Beam Design The Structure Are modeled in sap and The Beam and Column calculate whit this program.

The Column Section

The Beam Section

11. Anlysis Of Platform 11.1. Modeling Software Sap 2000 version 12.0.0 is used for Analyses purpose in this project. 11.2. Structural Geometry And Coding

11.3. Loading on Strucutre (KN)

11.4. Beam Column Ratio

11.5. Longiudinal Reinforcement