Tank Foundation Design Procedure_english_2006!06!29

8/12/2019 Tank Foundation Design Procedure_english_2006!06!29

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TANK FOUNDATION DESIGN PROCEDURE

TANK FOUNDATION module, which is supported by AFES.

1. Tank Foundation Module

The type of storage tanks normally encountered in refinery, petrochemical and other industrial plants

have cylindrical shells, essentially flat bottoms, and either cone roofs or float roofs. Tank size may

range from 10 to 200 feet in diameter with height from 16 to 56 feet.

AFES Modules

Suggested conditions for Tank Foundation Type is as below.


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Guideline and Recommendation for the design of Tank Foundations

Earth Foundations

with a Crushed stone Ringwall

Earth Foundations with a Concrete Ringwall ReTank

Foundation

Type

Conditions

to be

considered

The subgrade has adequate bearing capacity

and acceptable settlements

When the anchorage is not necessary

Large tanks, tanks with heavy or tall shells

and self-supported roofs impose a

substantial load on foundation under shell

Can be used where high foundation uplift

forced are encountered resulting form

internal pressure or wind/seismic loading to

provide for anchorage

Advantage The most economical type of tank foundation

Provides uniform support of the tank bottom

by dissipating concentrated loads in a granular

pattern

Allows very good leveling of the periphery

of the bottom and the shell which is

positioned on it

Can used in congested areas with space


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limitations

Dis-

advantage

Possible the uneven settlement which cause

additive effort in the future

Difficult to construct flat level plane of the

bottom of the shell of the tank

( Leveling Ring)

Catastrophic failure of the bottom is possible

if a leak starts and washes out the underlying

support

Relatively high cost than the crushed stone

ringwall foundation

Application

(Design

Basis to be

applied)

Large Diameter Tanks Small Diameter Tanks Al

Table 1-1 Tank Foundation Design Guide

Notes

Regions of low seismicity or in seismic areas where the tank diameter to height ratio is such that there is no uplift of th

The magnitude of lateral forces, overturning moments, and associated hydrodynamic mass be determined to assess their

design

A concrete leveling ring can be used under the tank shell in the gravel ring wall foundation. This leveling ringunreinforced concrete whose primary function is to provide a stable level base upon which the fabricator can build the tan

of the leveling ring are to distribute concentrated shell loads on to the gravel ring wall and minimize edge settlement under


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2. Tank Foundation Design Process

Choose Project

Start

Create Structure

Input Foundation Geometry

(=Node Data)

Assign Foundation Module

(=Foundation Type: Tank1

Input Feature Data

(=Footing, Pier Shape, Dimension)

Set Footing Bar, Pier Bar

IF Pile Foundation,

Array Pile Data

Set Anchor Bolt/Box

Input Equipment Data

Input Load Case/Combination

Structural

Calculation sheets

Take Off

Bill of Materials

Generate

Construction Drawing

Generate 3D

Modeling Data

END


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3. Tank Foundation Data Input

1. Click New/Open Projectto generate Tank Foundation in Toolbar iconMenu. Choose

Project that you want to work on in Project Dialog Window.Ex) This is example of choosing KCI_MKSProject.

AFES Main GUI : Open/Select Project


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2. Click Create New Structure Icon to input Structure Name in Toolbar Icon Menu.

Add : Input Structure Name in New Structure Name dialog, then OK command button.

Add New Structure


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3.Click Geometry DataIcon in Toolbar Icon Menu, then you can see Geometry :Foundation Location Plan (Node Data)Dialog.

Input the coordinates of Tank Foundation, then click Addcommand button. Input Tank

Foundation, and click SaveCommand button.

Note) Choose Foundation or Spread Row that you want to edit, then click Deleteto delete

Node.

EX) Make a Node to locate Tank Foundationby clicking Add. Input coordinates and click

Savecommand button.

Input/modify Geometry Data


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4. Click Assign Foundation GroupingIcon in Toolbar Icon Menu. The Structure GroupDialog as below is shown. There are four types of Foundation as below.

Type 1, Type 2, Type 3, Type 4

1, 3 Node uses Type 1(Footing : Circle) for Modeling. 2, 4 Nodes use Type 2(Footing :

Octagon). 5 Node use Type 3(Circle Ring). 6 Node uses Type 4(Footing : Polygon Ring, Pier

Circle Ring Wall).

a) Steps below is how to specify Type 1 Module for 1, 3 Nodes.

1. ClickNew

Command Button.

2. Input Group Namein Group Name Input Box, then choose Group Type Tank_1in

Group Type Input Box.

3. Choose Non Pile Fdn, or Pile Fdn. Based on Condition.

4 Click Same Sizebutton to apply same size and reinforced steel data for two different

foundation. A standard foundation for input Data can be chosen in Combo Box. Choose Node

to assign from Using node list, click >button, and click Saveto set up Foundation Module.


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b) Steps below are how to specify Type 2 Module for 2, 4 Nodes.

The standard shape of Type 2 module is Octagonal and Pier is Circle Ring Wall.

Note) Shape of Footing can be converted in Feature Dialog Window.

Click NewCommand Button. Input Group Namein Group Name Box. Choose Tank_1for

Group Type. Choose Non Pile Fdn, or Pile Fdn based on condition of Soil.

Choose Pile Foundation. Choose Node to assign from Using node list Click >and Save

to specify Foundation Module.

Assign Structure Group


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c) Steps below are how to specify Type 3 Module for 5 Nodes.

The standard shape of Type e module is Circle Ring Wall.


Group Type. Choose Block foundation, then Soil Condition is automatically chosen to Non

Pile Fdn. This foundation does not support Pile Foundation.

Click Difference Size( Each Foundation)button to apply different size and reinforced steel

data for two different foundation.

Choose Node to assign from Using node list Click >and Saveto specify Foundation

Module.



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d) Steps below are how to specify Type 4 Module for 6 Nodes.

The standard shape of Type 4 module is Polygon Ring, and Circle Ring Wall for Pier.

Note) Shape of Footing can be converted in Feature Dialog Window.


Group Type. Choose Non Pile Fdnbased on Soil Condition. Foundation Module only supports

Soil Foundation. Choose Node to assign from Using node list Click >and Saveto

specify Foundation Module.



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5. Choose TANK-FDN-01in Combo Box.

Click Feature Data Dimension)Icon in Toolbar Icon Menu, then Feature Input Dialogasbelow is shown. Steps to specify Type 1 Module is as below.

Choose Footing Tabin Dialog Box. Choose Soil Name. Check Allowable Bearing Pressure

of Soil Foundation using the information of Soil Name, which is input in Bearing Capacity of

Soil Tab of Setting of Constant Dialog.

This is Input Box when you want to design Footing by Element. (You do not need to choose

currently.)

Choose Footing Shape as a Circle.

Input Footing Diameter.

Input Height of Footing.

Input Lean Concrete and Crushed Stone Thickness.

Input Soil Height. (Standard of Footing Top: Upward +, Downward -)

Input a projecting part of Dimension of Lean Concrete and Crushed Stoneto horizontal

direction. (Standard of Footing Edge.) Click SaveCommand Button to save Data.

input Feature: Footing


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Choose a Pier Tabin Dialog Box.

Choose Pier Shape as a Circle Ring.

Input Pier Diameter.

Input Wall Thickness.

Input Pier Height.

Input Grout.

Move the Pier with eccentricity by inputting in Offset X/Y Direction.

Click SaveCommand Button to save Data.

Input Feature : Pier


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Most of steps are same as Type 1. Click SaveCommand Button to save Data.

Input Feature : Footing


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Most of steps are same as Type 1, but choose Circle Ring Shape in Footing ShapeCombo

Box.

Click SaveCommand Button to save Data.

Input Feature : Footing


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9. Choose Foundation in Group Combo Box.Click Feature Data Dimension)Icon inToolbar Icon Menu, then Reinforcement Input Dialogas below is shown.

Choose Footing Tabin Input Box.

Choose one of the Bar Array Types

Input reinforcing bar information fitting to Bar Array Type. 1 &3 Bar Types can choose only

the information of Bottom reinforcing bar. Choose size of Footing Top & Bottom reinforcing

bar. You can choose either Number or Spacing Input.

Note) You can choose Using Barin Material and Unit Weight Tab of Setting of Constant.

Bar DB that AFES can support is ASTM A615, KS D 3504, BS 4449, SAUDI ARABIAN, TS 708,

ES 272-74, and TIS 2725. You can add BAR DB if you e-mail to [email protected],kr.

InputFooting Clear Cover

in Clear Cover Tab of

Setting of Constant

. It applies to all

chosen Foundation. Data inputted in Setting of Constantare save in unit of Current Project.

Input Reinforcement Data


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Choose Pier Tab in Input Box.

Tie Array, Spiral Array (Tie Bar) is only used for PM Diagram Analysis of Pier.

It does not apply to Ring Wall Pier.

Choose Top Tie Bar Size, and input Spacing.

The Bar shape of Ring Wall Pier is .

The shape of Side Bar is .

Change Data of Pier, and click SaveCommand Button.


Note) The Main Reinforcing bar due to Hoop

Tension of Ring Wall is 10-D22 reinforcing bar.

(Main bar is Side Bar.)


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Input Information of reinforcing bar in Pier Tap for Ring Wall Footing.



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10. Choose Foundation to array Piles in Combo Box.

Pile DataIcon in Toolbar Iconis generated only when choosing Pile Foundation. Click

PileDataIcon in Toolbar Icon Menu, then Pile Array Form Dialogas below is shown.Choose Pile Namein Input Box.

Check Allowable Pile Capacity of Pile Foundation using the information of Pile Name, which is

input in Capacity of Pile Tab of Setting of Constant Dialog

Click View Group Reductionbox after inputting Pile Data, then you can check the overlap

of Pile to Pile.

Default Data is 1.5 x Pile Diameter from Footing Edge, and Pile to Pile is 2.5 x Pile Diameter.

Default Data to check overlap can be changed in Design/Auto Design/Set Parameters

window.

ClickInsert

Command button or

Generation (New)

command button to arrange Piles again.

Input Pile Data


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Example below is display result using Pile Generation (New)Wizard.

Data can be converted by clicking SaveCommand Button after changing X/Y Coordination

and Arranged Dia. of Spread Sheet.

Piles can be added by clicking Insert, Generation (Add)Command Button.

Click DeleteCommand Button to delete piles.

Input Pile Data


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11. Choose Foundation to input Anchor Bolt/Box Datain Combo Box. Layout of AnchorBoltsDialog is shown when clicking Anchor Bolts/Box DataIcon in Toolbar Icon Menu.

Layout of Anchor Boltsis information for drawing. AFES program does not examine Anchor

Bolt.

Choose who is going to supply Anchor Boltin Bolt Data.

Choose whether Anchor Bolt & Box uses Unified or Metric Units.

Data in Anchor Bolt Size is different depends on Units.

Note) Anchor Bolt Type & Size can be converted by Anchor Bolt Tab Box of Setting of

Constants.

Input Bolt Size, Projection, and Bolt Length. You do not need to input Bolt Size, Projection,

and Length Data if Using Anchor Boxin Anchor Box is checked.

Choose Anchor Bolts Array Type. (Rectangular, Circle Array)

If you choose Circle Array, Input Start Angle, Number of Anchor Bolt, and Anchor Bolt

Circle Diameter, and click DrawCommand Button.

To change Anchor Boltcoordinates, change Spread Sheet and click SaveCommand Button.

You can add Anchor Bolt by clicking AddCommand Button.

If you add Anchor Bolt on Circle Array, it changes to Rectangular Array.


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Input Anchor Bolt/Box Data

To delete all Anchor Bolt Data& input new data, choose Anchor Bolts Array Type, input

Data, and click DrawCommand Button.


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12. Choose Foundation to input Equipment Datain Combo Box. Click Equipment DataIcon in Toolbar Icon, then Equipment AssignDialog is shown.

To input specific information of Equipment, you have to input Equipment Name& Type.

Choose Equipment Node in Spread Sheet, and input Equipment Name.

Click SaveCommand Button in Toolbar Icon, and assign Equipment to Large Storage Tank.

Note) Tank1 Type assigns automatically the Equipment Type as Large Storage Tank.

Click deleteto delete Assigned Equipment.



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Click InputIcon in Toolbar Icon Menu after Equipment Assign, the dialog below is shown.

Chose Equipment Type. The shape of Tank is changed according to Type.

Input Equipment Diameter.Input Default Data as Pier to Pier Centervalue in AFES.

Input Equipment Shell/ Insulation/Fire Proofing Thickness.

Input an Equipment Height & Bottom Plate Height.

Input Equipment Empty, Operation, and Test Weight.

Input Internal Friction Angleof Soil.

Input a Filling Material Name, Unit weight, and Thickness for Ring Wall.

Note) Thickness1 + Thickness 2 of Ring Wall should be same as Pier Height.

Input a Data for Sump Pit.

To save Data, click Savebutton.



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g) 0.9DL + 0.9Oper + 1.43 X EQ

h) 1.05DL + 1.05Oper + 1.403 Y EQ

i) 0.9DL + 0.9Oper + 1.43 X EQ

j) 1.4DL + 1.4Empty(=Erec)

k) 1.05DL + 1.05Empty(=Erec) + 1.275 X Wind

l) 0.9DL + 0.9Empty(=Erec) + 1.3 X Wind

m) 1.05DL + 1.05Empty(=Erec) + 1.275 Y Wind

n) 0.9DL + 0.9Empty(=Erec) + 1.3 Y Wind

o) 1.05DL + 1.05Empty(=Erec) + 1.403 X EQ

p) 0.9DL + 0.9Empty(=Erec) + 1.43 X EQ

q) 1.05DL + 1.05Empty(=Erec) + 1.403 Y EQ

r) 0.9DL + 0.9Empty(=Erec) + 1.43 X EQ

s) 1.0DL + Test

Note) 1. Input Load Case Name & Load Case Valuein Load Case Window, and make a

Load Combinationin Load Combination Window.

2. Make Load Combinationusing Import Functionin Load Combination Window,

and go to Load Case Window, then Load Caseis automatically input.

After following 1 or 2 steps above, input Load Case Valuefor each pier.

Default Load Combinationin AFES has the function that can design Tank Foundationby

importing Vessel_Load_comb_1.txtfile in Data Directory.

Pier External Loading Sign Convention is as below.

Axial Loads (Fz), Shear Loads (Fx, Fy), Moment(Mx, My, Mz)

Axial Loads are negative downwards. Shear are positive if applied in the positive direction of

X and Y Axis. Moments Mx are positive if applied in the counter-clockwise direction about

the positive (+X) axis. Moments My are positive if applied in the clockwise direction about

the positive (+Y) Axis.


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Click Load CaseIcon, then Loads CaseDialog is shown.

a) Choose Node to add Load Case. (EX. Choose Node 1, 3.)

b) Choose Unassigned Load Casein Show state of Load Case.

c) Choose Load Casein List Box, and click SaveCommand Button.

d) To add more Load Cases, repeat step c). Added Load Caseis displayed in Spread.

e) If you finish adding Load Cases, click FinishCommand Button.

Input Load Case Data


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f) To add Load Case, click Edit node list, choose Unassigned Load Caseand Load

case, then click SaveCommand Button.

g) To delete Load Case, choose Load Caseand click RemoveCommand Button.

h) To input Load Case value, choose Load Case and input values in Spread Sheet, then

click SaveCommand Button.

Note) SW : Default Load Caseof AFES is SELF WEIGHT. Fy (=-1) means that automatically

calculate Foundation Self Weightto the direction of Vertical Downward.


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Click Load CombinationIcon, then Loads CombinationDialog is shown.

a) Click NewCommand Button.

b) Input Load Combination Name.

c) Choose Load Cases using Shift Key, then click >Command Button.

d) Input Factor Value.

e) Choose Elastic Strength(=Stability) or Ultimate Strength (=Reinforcement/Shear)

Check for Load Combination.

f) To use Safety Factor used for Sliding and Overturning Moment Check, choose Combo

Box when it is for Stability Check. AFES can use 4 Safety Factor. Choose Factor for

Allowable Increase in Combo Box.

Note) Set up Sliding, Overturning, and Allowable Increase in Setting of Constants.

g) Click SaveCommand Button to save the values.

h) Repeat step a) ~ g).


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4. Tank Foundation Design

1. Choose a Foundation Group.

The steps for Foundation design is as follow.

Click Foundation Analysis/Design Icon in Toolbar Menu, then Analysis and Design Dialog

Window is shown as below.

Choose Regular Shaped Foundation Design Method (=Default), and click OK Command Button.


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Example of clicking Go to DiagramCommand Button is as below.

SFD, BMD Diagram can be seen in case of Footing/Group/Load Combination.

In case of Tank Foundation, you can input values in Number of Moment Dist. Pointto

assume concentrated load as distributed load.

Click NextCommand Button to see Summary Sheet.


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Choose Load Combination for Foundation Design.

To draw several plans in Layout Plan, you can adjust using Number of Match PointTab.


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Summary Sheetsof calculation sheet is as below. You can save as PDF File Formatin any

Directory.

Click Show Detail ReportCommand Button to see detailed calculation sheet.


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Detailed calculation sheet is as below.

Print out Reports by clicking OptionIcon in Toolbar Menu.


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Click Design/Interactive Design/Ring Wall Designto design Ring Wall.


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To design a Ring Wall Pier, choose Footing in Footing Listand Pier in Pier List, then click

Calculation (One)Command Button.

Detail ReportTab is activated, and Design Result of Ring Wall is displayed.

Click Calculation (All)Command Button to design multiple Ring Wall. Detail ReportTab is

activated, and Design Result of Ring Wall is displayed.


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5. Material Calculation for Tank Foundation

To calculate Materials for Foundation, click Take Off Bill o f Material Icon in Toolbar Menu.

Input Spec. for Material Calculation, and click Calculationbutton.

To apply a same input Spec. to other Foundation, click SaveCommand Button.


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Materials Report for Foundation is as below.

It displays Data, Summary Table, Calculation BOM, and Calculation Rebar.

Rebar, Net BOM, here does not consider Bar Bending.


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6. Tank Foundation Drawing Generation

AFES interfaces directly with AutoCAD, and MicroStation to create a construction drawing.

Click Export DXF FileIcon in Toolbar Menu to generate construction drawing.

Click OptionCommand Button to adjust Parameters for Drawing Generation.

Click OKCommand Button to generate drawing.


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AFES provides the viewer below. AFES automatically save drawings in Directory/ DxfData/

Project No.

StandardTab is the value used for construction drawing.

LayoutTab is plan drawing of foundation location

The rest of Tabs are Foundation Detail Drawing.


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7. 3D Modeling Data

Refer to PDS_PDMS_User_Manual_English.pdf Manual for 3D Modeling Data generation. .

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Tank Foundation Design Procedure_english_2006!06!29