1) is a y -factor intended to define infrequent loads (see 2.2)

2) If a dominant action other than traffic or temperature has to be considered, this value may have to be replaced by 0,3.

3) Unless otherwise specified (e.g. in the case of brittle materials at low temperature - see the relevant design Eurocode). However, for serviceability limit states, see D3.4.

D3 - Serviceability limit states

D3.1 Simultaneity of load models on footbridges

(1) The rules concerning simultaneity given in D2.1.1 are applicable.

D3.2 Combinations of actions

(1) For persistent and transient design situations the various combinations should be taken from ENV 1991 -1, 9.5.2.

(2) in addition, if specified by the design Eurocode, the infrequent combination:

j £1 i>l should be considered. D3.3 Partial factors

(1) For footbridges, the partial factors on actions for serviceability limit states in persistent and transient situations should be taken as [1.0] unless otherwise specified.

D3.4 *F factors for footbridges

(1) Values of factors are given in Table D.2, excepted the -value applicable to thermal effects on footbridges of the first category, which is equal to I 0,6 .

Dynamic factors 1 + 9 for actual trains

(1)P To take account of dynamic effects resulting from the movement of actual service trains at speed, the forces and moments calculated from the specified static loads shall be multiplied by a factor appropriate to the greatest speed at which the vehicles can travel.

(2) These dynamic factors are also used for fatigue damage calculations.

(3)P The static load due to a train at v [mis] shall be multiplied by: either, 1 + <p = 1 + <p' + <p" or, 1 + <p = 1 + <p' + 0,5 <p"

Equation (E.2) shall be used, unless otherwise specified, with:

Was this article helpful?

0 0

Post a comment