In the early 90's a collaborative effort between the American Iron & Steel Institute, the US Navy, and the Federal Highway Administration began the development of high performance steel (HPS). HPS70W is the product of this effort and is currently being employed in bridge design. The benefits of this steel are higher fracture toughness, improved welding characteristics, and enhanced weathering characteristics. However, HPS70W has an increased material relative to traditional bridge steels.;The primary objective of this study was to investigate the economy of HPS70W in steel bridge design using various span lengths, girder spacings and yield strength combinations. Three extensive parametric studies were performed and examined for weight, performance, deflection, and cost.;These studies include: (1) a parametric study focused on using HPS70W in conjunction with the Load Factor Design Specifications, (2) a study focused on investigating the use of HPS 70W in simply-supported short span bridges using the Load and Resistance Factor Design [LRFD] specification, and (3) a cost study focused on using LRFD for a given 3 span configuration. (Abstract shortened by UMI.).
展开▼
