Column and Footing Pocket Connections for Cast in Place and Precast Construction (NDOT 593-18-803)

The overall objective of the proposed project is to develop a new design and detailing procedure for Cast-in-Place (CIP) and precast column pocket connections for application in conventional and accelerated bridge construction (ABC) in Nevada. The detailing procedure for CIP connections will take advantage of the lessons learned from a significant number of recent studies by the PI and others to simplify conventional construction by reducing steel congestion in connections. The detailing procedure for precast columns will integrate results from recent tests, analyses, and design method developments to propose practical design methods that NDOT may adopt to finalize its ABC program. The available preliminary design methods for ABC pocket connections need to be streamlined into guidelines for NDOT with input from NDOT bridge engineers. As indicated, before reducing steel congestion in conventional construction by adopting ABC pocket details has not been even considered, let alone studied, in previous research. Accomplishing the overall objective will contribute to NDOT’s ongoing efforts to update and develop new design and detailing standards for the footing and pier cap connection areas for both CIP and precast construction. Task 1 – Update Literature Search and Develop Project Website Task 2 – Develop Details for ABC and CIP Beam-Column Connections and CAM Hinges Task 3 – Design and Construct a Pier System Test Models and Conduct Seismic Load Testing Task 4 – Conduct Analytical Studies and Develop Design Methods and Examples Task 5 – Develop Implementation Plan for NDOT Task 6 – Prepare the Final Report The potential payoff to NDOT is three-fold addressing three aspects of bridge construction: (a) ABC with superior seismic performance, (b) improved constructability of conventional RC bridges, and (c) foundation cost reduction.