Civil Engineering Commons^™

Experimental And Analytical Study Of Dynamic Behavior Of Bridge Superstructures Subjected To Overheight Vehicle Collisions, Yuan Jing

Doctoral Dissertations

The increasing occurrence of over-height vehicle collisions with bridges in the United States leads to concern about the damage due to lateral impact to bridge superstructures by over-height vehicles. However, this issue is not fully addressed in current bridge specifications. Previous researchers have conducted a number of small-scale tests to study the impact process. Also, finite element method (FEM) has largely been used to analyze the complicated collision mechanism.

A full-scale lateral impact testing facility was designed and built on a construction site in Knoxville, Tennessee, United States. An AASHTO Type-I prestressed concrete (PC) girder and a Hybrid Composite Beam …

Seismic Behavior Of Concrete Frames With Jacketed Columns, Jose Alvarez

Doctoral Dissertations

Research on jacketed reinforced concrete (RC) columns is well established and growing. The existing studies describe the ability of jackets to rehabilitate RC columns for seismic demands. The system in the studies has proven to upgrade both strength and ductility of their unretrofitted counterparts, concentrated on repairs of deficiencies, currently in columns designed with old code provisions. These deficiencies include: low shear strength, insufficient core confinement, and short lap-splices, in particular within the plastic hinge zone. Columns with these deficiencies usually have brittle failures and cannot develop displacement ductility ( ) greater than 2. Research results on columns retrofitted with …