LOADS AND LOAD COMBINATION MODELS FOR HIGHWAY BRIDGES

Efficient load models need to be developed, to enable the development of rational design and evaluation criteria for bridges. Load parameters are random variables, depending on uncertainties in loads, load distribution factors, prediction of future loads, etc. Actual measurements indicate that loads are site-specific and component-specific. Statistical load models are based on test data, measurements, and simulations. This paper focuses on dead load, live load, dynamic load, and extreme load events and models and their combinations. 'Dead load' is the gravity load due to the self-weight of the structural and nonstructural elements permanently connected to the bridge. 'Live load' covers a range of forces produced by vehicles moving on the bridge, including static and dynamic components. The dynamic load model is a function of three major parameters: road surface roughness, bridge dynamics (vibration frequencies), and vehicle dynamics (suspension system). The earthquake load model considers a temporary time-varying load. Although scour by a river is not a load, it can considerably affect bridge performance because of load redistribution; it is also strongly time-varying. Like earthquake loading, vessel collision can be represented statistically by a time-varying product of three variables. For the covering abstract see IRRD E104152.

  • Availability:
  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Publication Date: 1999

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00788366
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-2841-5
  • Files: ITRD
  • Created Date: Mar 3 2000 12:00AM