Concrete Bridge Barriers: State-of-the-Art and Design Implementation.

The current design guidelines for concrete barriers have not been updated much since the 1990s despite (1) several experimental, analytical, and computational studies that addressed both the demand and capacity sides of the design problem and (2) substantial increases in the velocity and weight of certain types of trucks specified in the crash testing guidelines that led to significantly higher impact demands than in the previous times. This state-of-the-art paper critically reviews the findings of previous studies and critiques their proposed design models. It highlights the lack of consensus regarding the failure mechanisms that should be considered in the design of concrete barriers and contrasts the results of a variety of proposed models with current design guidelines. Based on the review, recommended models for barrier design are proposed to aid in future revisions of the design specifications. Future research directions are also identified and discussed. [ABSTRACT FROM AUTHOR]