OCR Text |
Show COLLEGE OF ENGINEERING UNDERGRADUATE RESEARCH ABSTRACTS REPAIR OF DAMAGED COLUMN-TO-FOOTING GROUTED SPLICE SLEEVE CONNECTION Dylan N. Brown (Chris P. Pantelides) Department of Civil and Environmental Engineering University of Utah Grouted spliced sleeve connections of precast concrete elements are gaining popularity and use worldwide. This increase in use, which is on the rise, is for good reason considering the benefits in ease and speed of construction as well as cost effectiveness. Although structures have been built that utilize spliced sleeve connections in seismic regions, little research has been put forth to investigate a viable repair technique for these structures if they are damaged in large earthquakes. Before a repair technique could be implemented or properly designed, an undamaged 11 -foot tall column- to-footing assembly was cyclically tested to determine its non-linear performance. The performance was measured in terms of load capacity, ductility, energy dissipation and damage levels. The results of the test showed extensive damage in the bottom 14 inches of the column. This damage characteristic led to a repair technique that forces future damage above this region. The design utilizes Carbon Fiber-Reinforced Polymer (CFRP) jackets for confinement and mild steel epoxy anchored reinforcement for recovering the strength of the original assembly. The next phase of research is to implement, test and compare the results of the repaired assembly to the undamaged one. This repair technique provides an aesthetically pleasing, minimally intrusive and cost effective repair. If proven satisfactory the repair will be a feasible alternative to replacing damaged splice sleeve structural elements after an earthquake. Chris P. Pantelides |