01we Bond Worked Example Combinations of Actions

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Background & Applications

GEOTECHNICAL DESIGN wi th worked examples 13-14 June 2013, Dubli n

Worked example com na on o

i n

Dr Andrew Bond

Director, Geocentrix Ltd

Chairman TC250/SC7


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Worked example

combination of actions

DESIGN SITUATION


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w wor e examp es - une, u n

Design situation for combination of actions

6m Bfdn

btank

By LfdnLtank

Bx

2005-13 Geocentrix Ltd. All rights reserved3


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Design situation for combination of actions

Roof loading 0.6 kPa

Partition loading 0.8 kPa

Wind loading 1.15 kPa

h

gnore no ona oa s

h

dfdn

h



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EN 1997-1 2.4.6.1(2)P

Eurocode 7 defines the representative action Frep as:

Fk = characteristic value

= =

>

=, ,1 ,

1 1

rep k k j k i k ij i

. , , ,

Gk,j = characteristic permanent action; Qk,i = characteristic variable actionQk,1 = leading variable action; Qk,i>1 = accompanying variable action



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Combination of actions

Combin-ation

Rep.varble

actions

Limitstate

Design situation(DWL = design working

life)

Example

C aracter-istic

0 Qk ULS Persistent perio ~ DWL Norma use

ULS Transient (period


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Combination of actions for buildings

Action 0 1 2Imposed loads in buildings (EN 1991-1-1)

A: domestic, residential areas 0.7 0.5 0.3

B: office areas 0.7 0.5 0.3

C: congregation areas 0.7 0.7 0.6

: s opp ng areas . . .

E: storage areas 1.0 0.9 0.8

F: traffic area, vehicle weight 30kN 0.7 0.7 0.6

: ra c area, ve c e we g160kN

. . .

H: roofs 0 [0.7] 0 0

- -

Wind loads on buildings 0.6 [0.5] 0.2 0

Values in [brackets], given in BS EN 1990, replace values in EN 1990



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Partial factors for buildings

Action Symbol Set B Set C

Permanent Unfavourable su erior 1.35, .

Favourable (inferior) G,inf 1.0

Variable Unfavourable Q 1.5 1.3

Accidental Unfavourable A 1.0Seismic Unfavourable AE 1.0



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Worksheet combination of actions

Calculate these combinations:

action with Set B factors

2. As 1, but removable

3. Imposed loads as leadingvariable action/Set B factors

. ,

5. As 2, with Set C factors

6. As 3, with Set C factors7. As 1, for SLS

8. As 2, for SLS


. ,


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Worked example

combination of actions

SOLUTION


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Solution combination of actions

# Limitstate

Leadingvariable

Removedpermanent

NEd(kN)

MEd(kNm)

action actions?

1 ULS Wind No 2400 2405

3 ULS Imposed No 2510 1443

4 ULS Wind No 1802 2084

5 ULS Wind Yes 1631 2084

6 ULS Imposed No 1898 12507 SLS Wind No 1688 0

8 SLS Wind Yes 1631 0


mpose o


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Summary of key points

Geotechnical engineers need to understand combinations of actionsto ensure effective communication with structural engineers

ULS verifications are normally checked with Persistent/Transient (the

SLS verifications are normally checked with Quasi-Permanent (i.e.average loading) combination



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blo .eurocode7.com

www.decodingeurocode2.com

www.decodin eurocode7.com

DECODING THE EUROCODES


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Geotechnical designw wor ex m l

eurocodes.jrc.ec.europa.eu

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01we Bond Worked Example Combinations of Actions