Seismic Performance of Corroded Precast Concrete Columns

Presentation

Seismic Performance of Corroded Precast Concrete Columns

Accelerated Bridge Construction (ABC) results in bridges that are assembled using precast concrete elements built with better quality in significantly shorter time than cast-in-place (CIP) bridges. Despite these advantages, ABC bridges are vulnerable to corrosion, a phenomenon observed in CIP bridges as well. Corrosion adversely affects the lateral force and axial compression capacity of reinforced concrete columns, posing a concern for the structural integrity of both bridge types. The columns tested in this study include: (i) a control specimen with no corrosion; (ii) a specimen exhibiting moderate corrosion (with a target 10% loss in mass of longitudinal steel reinforcement); and (iii) a specimen displaying severe corrosion (with a target 25% loss). The impressed current technique was used for accelerating corrosion of the specimens in the laboratory. A numerical model was developed to calibrate the physical experiments of the control and corroded specimens. The numerical model could predict the experimental drift ratio with satisfactory accuracy up to bar fracture. The objective of this study is to quantify the decrease in lateral force and drift ratio capacity observed in corroded reinforced concrete columns constructed through ABC methods under seismic loads. In this context the deterioration due to corrosion and subsequent earthquake damage can be considered as multiple hazards. The research findings emphasize a significant decline in the lateral displacement capacity of reinforced concrete columns subjected to moderate and severe corrosion. The numerical model was subsequently used to perform parametric studies for similar columns with higher levels of corrosion deterioration.

Speaker

Chris P. Pantelides, PhD, SE, F. ASCE, F. ACI
University of Utah

Dr. Chris P. Pantelides is a Professor in the Department of Civil Engineering at the University of Utah and Site Director of the National Center for Transportation Infrastructure Durability & Life-Extension (TriDurLE). He is a member of TRB AFF50 Committee (Seismic Design and Performance of Bridges), ACI Committee 374 (Performance-Based Seismic Design of Concrete Buildings), and ACI-ASCE joint Committee 352 (Joints and Connections in Monolithic Concrete Structures). He is the Fellow of ACI and ASCE. Dr. Pantelides received his PhD and MS in Civil Engineering from University of Missouri, Rolla. His research interests include seismic design, evaluation, and rehabilitation of reinforced concrete building and bridge construction.

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