Appendices

113

Contrary  to  the  requirement  in  DIN  EN  1993-1  -10/NA  [7],  the  service  temperatures  T mdr  =  T md
+  AT r  may  be  selected  from  the  following  table.  The  value  given  in  line  1  also  applies  here  to
components  where  only  one  side  is  wetted  by  water  if  unobstructed  ventilation  is  not  possible
on  the  side  away  from  the  water  (e.g.  inside  the  hollow  sections  of  the  foundations).  If  this  is
not  the  case,  the  value  in  line  3  shall  be  used  in  the  calculation.

Line

Components  or  sections  of  the  components  of  the  foundations

Service
temperature  T mdr

1

-  below  lowest  astronomical  tide  (LAT)

-5  °C

2

-  above  lowest  astronomical  tide  (LAT)

-15  °C

3

-  which  are  permanently  wetted  by  water  from  one  side

-10  °C

Table  5-V.1  :  Service  temperature  for  components  in  the  EEZ  of  the  North  Sea  and  the  Baltic
For  cold-formed  circular  hollow  sections  in  accordance  with  DIN  EN  10219  [11]  where  the  ratio
of  the  inner  radius  to  the  wall  thickness  r/t  <  15,  the  steel  grades  used  should  be  those  for  which
sufficient  Charpy  impact  energy  values  after  strain  aging  have  been  verified.  This  can  be  done
by  ordering  Option  12  for  steel  grades  in  accordance  with  DIN  EN  10225.  The  temperature  shift
for  the  brittle  fracture  verification  shall  be  determined  using  Equation  2.4  in  accordance  with  DIN
EN  1993-1  -10  [7]  and  limited  to  a  maximum  AT ECf  <  20  K  because  of  the  cold-forming  grade.  The
largest  permissible  product  thicknesses  for  low  reference  temperatures  T Ed  and  further  information ­
  can  be  obtained,  where  necessary,  from  the  comment  to  [7]  in  the  Stahlbaukalender  (steel
construction  calendar)  2012  (Table  7,  p.  375).  For  ratios  r/t  >  15,  the  cold  forming  for  cold-formed ­
  circular  hollow  sections  may  be  disregarded  in  the  verification.
For  cold-formed  rectangular  and  square  hollow  sections,  the  value  of  the  temperature  shift
brought  about  by  the  cold  forming  which  has  to  be  used  is  AT ECf  =  35  K  for  wall  thicknesses  t
<  16  mm  or  AT ECf  =  45  K  for  wall  thicknesses  16  mm  <  t  <  40  mm.  The  further  notes  apply  similarly ­
  to  cold-formed  circular  hollow  sections.
In  justified  cases,  it  is  possible  to  deviate  from  the  definition  of  the  test  temperatures  and
Chirpy  impact  energies  laid  down  in  DIN  EN  1993-1-10,  Table  2.1  while  retaining  the  fracture
toughnesses  to  be  achieved.  The  fracture  mechanics  concept  for  selecting  the  steel  grade  as
per  DIN  EN  1993-1  -10  allows  the  equivalent  conversion  of  the  test  temperatures  when  adapting ­
  the  Charpy  impact  energies  to  be  achieved.

5-V.3  Additional  requirements  for  multi-axial  stress  states
Components  which  have  multi-axial  stress  states  as  a  result  of  the  production  conditions  and/
or  the  operational  loads  require  special  considerations  when  selecting  the  steel.  This  concerns ­
  nodal  points  between  corner  posts  and  diagonal  braces  in  truss  constructions,  for  example. ­