Dennis Mertz Symposium on Design and Evaluation of Concrete Bridges

Abstract

The Symposium Publication (SP) is expected to be an important reference in relation to design philosophies and evaluation methods of new and existing concrete bridges and structures. Industry liaison was provided by the Prestressed Concrete Institute and the American Segmental Bridge Institute. Design for flexure in B-Regions is based upon the conventional beam theory of Article 5.6 while the design for shear in B-Regions is based on conventional beam theory in conjunction with the truss analogy of Article 5.7. The provisions apply to components with reinforcement yield strengths not exceeding 75.0 ksi (520 MPa) and with normal weight concrete compressive strengths for use in design up to 15.0 ksi (105 MPa). Based on a comparison of load factors and resistance factors for concrete design in the ACI and AASHTO specifications it was concluded that the strength reduction factors in ACI 318-14 Chapter 17 [10] are reasonable and possibly somewhat conservative for this first introduction of anchor design into the AASHTO LRFD