Abstract The shear friction design concept is applicable in conditions where direct shear must be transferred across a structural concrete plane or interface, such as an existing crack or an interface between dissimilar materials or concretes cast at different times (i.e., cold joint). Shear friction provisions are commonly used in the design of reinforced concrete and precast-prestressed concrete bridge elements and connections including corbels, dapped double tees, beam bearings, and diaphragms. These types of connections are critical because there is little or no redundancy, which makes them a critical part of the structure. This project will examine the applicability of current shear friction design approaches to concrete-to-concrete interfaces with high strength concrete and/or high strength steel, by means of assembling and evaluating a comprehensive database of test results collected from the literature, and to identify potential needs for revision to the AASHTO LRFD Bridge Design Specifications.
Objective The objectives of this study are to examine the applicability of current shear friction design approaches to interfaces with high strength concrete and/or high strength steel, by means of assembling and evaluating a comprehensive database of test results collected from the literature, and to identify potential needs for revision to the AASHTO LRFD Bridge Design Specifications. This study will focus on concrete-to-concrete interfaces and will evaluate the equations used to compute the design shear strength, limitations on material strengths, and maximum design shear strength values in the AASHTO LRFD Bridge Design Specifications shear friction design provisions.
Impacts/Benefits Results of this project will directly impact the AASHTO LRFD Bridge Design Specifications by either validating current shear friction design provisions or justifying changes to improve safety and/or accuracy. Results will lead to safer and/or more economical designs of concrete bridges.
Deliverables
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