A six (6) story parking garage for a residential building consisted of precast, pre-topped double-tee beams and pre-cast wall panels. A concern regarding life safety was expressed due to the observed distress consisting of spalling of the concrete beneath the welded connections along the flange of adjacent double-tee beams. In addition, concrete cracking in the vertical panels of the pre-cast walls was observed. CA’s investigation focused on determining the cause of the distress and included, but was not limited to, a detailed condition survey and visual inspections of over 1,600 welded connections and a review of the construction drawings and plans. CA determined the cause of the observed distress and developed recommendations for repair and rehabilitation of the concrete structure, including design of repair procedures, materials selection, and quality control/assurance procedures during and after implementation of the repairs.
