Earthquake code AS 1170.4 not applicable to bridges Earthquake code AS 1170.4 not applicable to bridges kww2008 (Structural) (OP) 25 Sep 16 01:59 Does anyone know the background behind why the earthquake code states that it is not applicable to bridges ? RE: Earthquake code AS 1170.4 not applicable to bridges IDS (Civil/Environmental) 25 Sep 16 07:55 Bridge loading, including earthquake loads, is covered by AS 5100. Doug Jenkins Interactive Design Services http://newtonexcelbach.wordpress.com/ RE: Earthquake code AS 1170.4 not applicable to bridges kww2008 (Structural) (OP) 25 Sep 16 08:49 Thank you Doug for the response. I have a further question regarding structures other than bridges which although covered by AS 5100 have no earthquake loading given in AS 5100 for them. In Section 14 Ëarthquake Design" loading of AS 5100.2, the loading described in the section is for the design of bridge and associated structures such as approach retaining wall. Bridge Design standard also applies to structures other than bridges such as sign gantries (see AS 5100.1, Section 1). In designing sign support structures, earthquake loading described in Section 14 of AS 5100.2 is not suitable as these structures are not bridges and neither are they bridge associated structures (e.g. approach retaining walls). For sign support structures, should one be using AS 1170.4 for earthquake loading instead of using AS 5100? RE: Earthquake code AS 1170.4 not applicable to bridges Shz713 (Structural) 14 Dec 16 21:30 Quote (Kww 2008) That's correct, for sign gantries better to use AS 1170.4 and is perfectly fine (I told my students same for their capstone project) AS 5100 is undergoing revisions particularly part 5 and part 7 and updated versions will be more detailed. CHeers, Shoot for the Moon, even if U miss, U still land among Stars!