Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

AASHTO LRFD Single Span Bridge

Status
Not open for further replies.

RyUIUC

Structural
Joined
Sep 21, 2011
Messages
16
I am evaluating loads submitted by another firm for a single span bridge in seismic zone 1 (or seismic zone A). I am a little confused by the minimum connection design forces in the specification. AASHTO LRFD Section 3.10.9.1 states that all single span bridges regardless of zone must be designed for a connection force of As (=Fpga*PGA) x tributary permanent load. The next section (3.10.9.2) then states for bridges in zone 1 that the minimum connection force equal 0.25 x the tributary permanent load (for As>0.05).

My question is which section supersedes the other? In my case the zone one requirements are substantially greater so I assumed they governed but the calulation I am reviewing is using the other criteria for single span bridges.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top