Theoretical and Field Experimental Evaluation of Skewed Modular Slab Bridges.

摘要

As a result of longitudinal cracking discovered in the concrete overlays of some recently-built skewed bridges, the Maryland State Highway Administration (SHA) requested that this research project be conducted for two purposes: (1) to determine the cause or causes of the reflective cracking on those bridges and (2) to propose additions and/or revisions to the current state bridge design standards concerning the number, orientation, and location of the transverse post-tensioning, specifically in reference to a bridges skewness. At first, a literature review and a state practices survey were conducted. Then, a bridge with a cracked concrete overlay in the State of Maryland was selected and field tested. Subsequently, the FEM model of the tested bridge was used as a base for further parametric study to gain more complete knowledge of how the skew angle affects transversely post-tensioned adjacent precast prestressed concrete slab bridges. Final summary and conclusions with recommended revisions to the current Maryland bridge design standards were made for the SHA's consideration.