7/30/2019 NSC1610 Feature 1

1/1 NSC November/December 2008 11

Countdown to

Eurocode Implementation March April May June July August September October November December January February March April May

2008 2008 2008 2008 2008 2008 2008 2008 2008 2008 2009 2009 2009 2009 2009

National Annexes

The National Annexes (NA) or the

ollowing parts o Eurocode 3 are

complete and will be published by BSI

later this year.

Eurocode3:Designofsteelstructures

Part 1.1: General rules and rules or

buildings

Eurocode3:Designofsteelstructures

Part 1.2: General rules Structural re

design

Eurocode3:Designofsteelstructures

Part 1.8: Design o joints

Eurocode3:Designofsteelstructures

Part 1.10:

These NAs contain the partial saety

actors and nationally determined

parameters or structures that are built

in the UK. The partial saety actors havebeen determined by extensive calibration

o the Eurocodes against national

standards such as BS 5950 and have

been selected to maintain current saety

levels. The main partial saety actors

or members and joints are given in the

tables to the right.

Eurocode 3 Part 1.1 allows the NA to

dene the serviceability limits or vertical

and horizontal defections and dynamic

eects. It is recognised that defection

limits require experience and judgement

on the part o the designer and thereore

the limits given in the NA are or

guidance only. Situations may arise

where higher defections are acceptable.

No limits are given or portal rames. The

suggested defection limits (which are to

be checked under unactored imposedloads) are shown in the table to the right:

Eurocodes

Description Symbol National

Annex Value

Resistance o cross-sections M0

1.00

Resistance o members to instability assessed by members checks M1

1.00

Resistance o cross-sections in tension to racture M2

1.25

Description Symbol National

Annex Value

Resistance o bolts M2

1.25

Resistance o rivets M2

1.25

Resistance o pins M2

1.25

Resistance o welds M2

1.25

Resistance o plates in bearing M2 1.25

Slip resistance:

a) At ultimate limit state (Cat C) M3

1.25

b) At serviceability limit state (Cat B) M3, ser

1.10

Bearing resistance o injection bolts M4

1.00

Resistance o joints in hollow section lattice girders M5

1.00

Resistance o pins at serviceability limit state M6, ser

1.00

Preload o high strength bolts

ForboltsconformingtoBSEN14399-4andBSEN14399-8 M7

1.10

Others M7

1.00

Vertical defections

Cantilevers Length/180

Beams carrying plaster or other brittle fnish Span/360

Other beams (except purlins and sheeting rails) Span/200

Purlins and sheeting rails To suit the characteristics o

particular cladding

Horizontal defections

Tops o columns in single-storey buildings except portal rames Height/300

Columns in portal rame buildings, not supporting crane runways To suit the characteristics o

the particular cladding

In each storey o a building with more than one storey Height o that storey/300

Suggested defection limits

Partial Saety actors, M

, or joints

Partial saety actors, M

, or buildings