Autodesk Robot Structural Analysis Professional 2011 - Note

Autodesk Robot Structural Analysis Professional 2011 Author: Address:

1

File: Structure.rtd Project: Structure

Spread footing: Foundation1

1.1

Number: 1

Basic data

1.1.1

Assumptions  Geotechnic calculations according to  Concrete calculations according to  Shape selection

1.1.2

1.1.3

Geometry:

A B h1 h2 h4

= 2.20 (m) = 2.20 (m) = 0.40 (m) = 0.00 (m) = 0.10 (m)

a' b' c1 c2

= 450 (mm) = 450 (mm) = 50 (mm) = 50 (mm)

a b ex ey

= 0.45 (m) = 0.45 (m) = 0.00 (m) = 0.00 (m)

Materials  Concrete

: C20; Characteristic strength = 21.00 MPa Unit weight = 2501.36 (kG/m3) : type T Characteristic strength =

 Longitudinal reinforcement 460.00 MPa  Transversal reinforcement 250.00 MPa 1.1.4

: BS 8004 : BS 8110 : without limits

: type

R

Characteristic strength =

Loads: Foundation loads: Case

Nature

Group

DL1

dead load

1

N (kN) 785.71

Fx (kN) 0.00

Fy (kN) 0.00

Mx (kN*m) 0.00

Backfill loads: Case

Date : 19/03/09

Nature

Q1 (kN/m2)

Page : 1

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My (kN*m) 0.00


1.1.5

Combination list 1/ 2/* 3/* 4/*

1.2 1.2.1


SLS : 1.00DL1 ULS : 1.40DL1 ULS : 1.00DL1 SLS : 1.00DL1

Geotechnical design Assumptions  Foundation design for: • Capacity • Rotation • Sliding • Sliding with soil pressure considered: • Uplift • Average settlement

1.2.2

for X and Y directions

Soil: Soil level: Column pier level: Minimum reference level:

N1 Na Nf

= 1.00 (m) = 0.00 (m) = -0.50 (m)

well graded gravels • Soil level: 1.00 (m) • Unit weight:2243.38 (kG/m3) • Unit weight of solid: 2702.25 (kG/m3) • Internal friction angle: 35.0 (Deg) • Cohesion: 0.00 (MPa) 1.2.3

Limit states Stress calculations Soil type under foundation: not layered SLS : 1.00DL1 Design combination Load factors: 1.00 * Foundation weight 1.00 * Soil weight Calculation results: On the foundation level Weight of foundation and soil over it: Gr = 149.52 (kN) Design load: Nr = 935.23 (kN) Mx = -0.00 (kN*m) My = 0.00 (kN*m) Soil profile parameters: C = 0.00 (MPa)  = 0.00  = 0.00 (kG/m3) Stress in soil: 0.19 (MPa) Design soil pressure 0.20 (MPa) Safety factor: 1.035 > 1 Uplift Uplift in SLS

Date : 19/03/09

Page : 2



Design combination: Load factors: Contact area:


SLS : 1.00DL1 1.00 * Foundation weight 1.00 * Soil weight s = 4.89 slim = 1.00

Sliding Design combination Load factors:

SLS : 1.00DL1 1.00 * Foundation weight 1.00 * Soil weight Weight of foundation and soil over it: Gr = 149.52 (kN) Design load: Nr = 935.23 (kN) Mx = -0.00 (kN*m) My = 0.00 (kN*m) Equivalent foundation dimensions: A_ = 2.20 (m)B_ = 2.20 (m) Sliding area: 4.84 (m2) Foundation/soil friction coefficient: tg( = 0.70 Cohesion: C = 0.00 (MPa) Soil pressure considered: Hx = 0.00 (kN) Hy = 0.00 (kN) Ppx = 0.00 (kN) Ppy = 0.00 (kN) Pax = 0.00 (kN) Pay = 0.00 (kN) Sliding force value F = 0.00 (kN) Value of force preventing foundation sliding: - On the foundation level: F(stab) = 654.85 (kN) Stabilility for sliding: 

Average settlement Soil type under foundation: not layered SLS : 1.00DL1 Design combination Load factors: 1.00 * Foundation weight 1.00 * Soil weight Weight of foundation and soil over it: Gr = 149.52 (kN) Average stress caused by design load: q = 0.19 (MPa) Thickness of the actively settling soil: z = 4.40 (m) Stress on the level z: - Additional: zd = 0.02 (MPa) z = 0.13 (MPa) - Caused by soil weight: Settlement: - Original s' = 1 (mm) - Secondary s'' = 0 (mm) - TOTAL S = 1 (mm) < Sadm = 50 (mm) Safety factor: 39.02 > 1 Settlement difference Design combination Load factors: Settlement difference: Safety factor: 

SLS : 1.00DL1 1.00 * Foundation weight 1.00 * Soil weight S = 0 (mm) < Sadm = 50 (mm)

Rotation About OX axis Design combination

Date : 19/03/09

SLS : 1.00DL1

Page : 3




Load factors:

1.00 * Foundation weight 1.00 * Soil weight Weight of foundation and soil over it: Gr = 149.52 (kN) Design load: Nr = 935.23 (kN) Mx = -0.00 (kN*m) My = 0.00 (kN*m) Stability moment: Mstab = 1028.75 (kN*m) Rotation moment: Mrenv = 0.00 (kN*m)



Stability for rotation: About OY axis Design combination: Load factors:

SLS : 1.00DL1 1.00 * Foundation weight 1.00 * Soil weight Weight of foundation and soil over it: Gr = 149.52 (kN) Design load: Nr = 935.23 (kN) Mx = -0.00 (kN*m) My = 0.00 (kN*m) Stability moment: Mstab = 1028.75 (kN*m) Rotation moment: Mrenv = 0.00 (kN*m) Stability for rotation: 

1.3

RC design

1.3.1

Assumptions  Exposure

1.3.2

: mild

Analysis of punching and shear Shear Design combination Load factors:

ULS : 1.40DL1 1.00 * Foundation weight 1.00 * Soil weight

Design load: Nr = 1249.52 (kN) Mx = -0.00 (kN*m) My = 0.00 (kN*m) Length of critical circumference: 2.20 (m) Shear force: 266.42 (kN) Section effective height heff = 0.34 (m) Shear area: A = 0.75 (m2)  = 0.18 % Reinforcement ratio: Shear stress: 0.36 (MPa) Admissible shear stress: 0.37 (MPa) Safety factor: 1.044 > 1 1.3.3

Required reinforcement Spread footing: bottom: ULS : 1.40DL1 My = 190.63 (kN*m)

Asx = 612 (mm2/m)

ULS : 1.40DL1 Date : 19/03/09

Page : 4



Mx = 190.63 (kN*m)


Asy = 612 (mm2/m) = 520 (mm2/m)

As min top:

A'sx = 0 (mm2/m) A'sy = 0 (mm2/m) = 0 (mm2/m)

As min Column pier: Longitudinal reinforcement A Asx

1.3.4

A = 0 (mm2) = 2 * (Asx + Asy) = 0 (mm2) Asy

A min.

= 0 (mm2)

Provided reinforcement 2.3.1 Spread footing: Bottom: Along X axis: 7 T 16

l = 2.10 (m)

e = 1*-1.05

7 T 16

l = 2.10 (m)

e = 0.32

Along Y axis: Top:

2.3.2 Pier Longitudinal reinforcement

Transversal reinforcement 3 R6

2

l = 1.43 (m)

e = 1*0.18

Material survey:  Concrete volume  Formwork

= 1.94 (m3) = 3.52 (m2)

 Steel T  Total weight = 46.42 (kG)  Density = 23.98 (kG/m3)  Average diameter = 16.0 (mm)  Survey according to diameters: Diameter 16  Steel R  Total weight Date : 19/03/09

Length (m) 2.10

= 0 (mm2)

Number: 14

= 4.16 (kG) Page : 5




 Density = 2.15 (kG/m3)  Average diameter = 8.7 (mm)  Survey according to diameters: Diameter 6 12

Date : 19/03/09

Length (m) 1.43 0.90

Number: 3 4

Page : 6


Autodesk Robot Structural Analysis Professional 2011 - Note

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