On January 23, 2009, a car impacted one of the walls of the parking garage, which caused a partial collapse of the concrete wall. Our scope of work for this project included managing the emergency and removing loose materials and contract documents to rebuild the wall and guardrail. On a separate project, we have provided the City of Hampton with two options for developing a guardrail system that will withstand the code prescribed loads. Our first option for vehicle barrier consists of HSS 4X4 posts at 7 feet on center connected by a 12-inch deep channel. Our second option consists of HSS 4X4 intermediate posts and HSS 6X4 end posts connected by post-tensioning steel cables. Both options are located on the existing slab to achieve minimum obstruction to the existing parking spaces. MDG also provided the design of modifications for a new elevator to meet special requirements for the City (not required by the IBC Building Code), specifically, providing guardrails at the second, third and fourth level as you exit the elevator, installing a new handicap ramp at the ground floor, and installing bollards around the elevator at all floors.

This project included isolated repairs to four (4) levels of the Parking Garage, including replacement/repair of an expansion joint, repairs to damaged brick at the expansion joint location, installation of a concrete berm at the edge of the expansion joint for a small distance on one (1) side, replacement of damaged precast bumpers at the isolated location in the parking garage, and repairs to a hand made drainage trough located below the expansion joints.

This project included the preparation of sketches that were used to repair joints between the precast panels on the top floor of the parking garage and provide a coating to selected double T’s. The purpose of the sketches was to help in the repair of failed joints and to coat the concrete at areas where there are minor cracks in the double T’s. This design was to eliminate the majority of water leaking into the floors below. The locations of the repairs were selected by the City and our sketches were used for the repairs at those locations.

This project included the inspection and removal of all loose concrete at the City Hall Parking Garage and cleanup of the removed material. The reason that this work was necessary is to protect cars and people from small pieces of loose concrete that could fall off of the structure. In addition, we completed contract documents for concrete repairs, including cracks and spalls throughout the parking garage.

This project included a preliminary Report of our emergency inspection of the west ramp. We were asked to complete an inspection to look at deteriorated conditions for a double T concrete precast member and an inverted T beam that is located over the first floor ramp at the west end of the Parking Garage. Our inspection of those structural members resulted in us advising the City to close down the second floor ramp at the west end of the parking garage until repairs could be made. We completed calculations to temporarily shore up the west ramp until the ramp could be repaired, and we provided contract documents for the repairs to the structure.

This project included field investigation of the concrete structure after a vehicle accident at the Edinburgh Parking Garage. We coordinated the removal of loose concrete around the building at both levels and ramps and provided sketches for repairs to the concrete wall/columns.

This project included field investigation and contract documents to add a new metal stud & IEFS facade on the south side of the structure. We also repaired the spalls, cracks, and chips of the precast concrete structure.

This project involved the Parking Garage and a Verizon duct bank. The Parking Garage could not be moved to miss the duct bank and the duct bank could not be moved due to the extreme costs associated with such an endeavor. Obviously, piles could not be driven through the duct bank and we could not bridge over the duct bank due to the shallow depth.Therefore, we designed eccentric pile caps to support columns and shearwalls. In a couple of cases, a pile cap had to be split into two (2) pile caps with one on each side of the duct bank. At these locations, a section of unsupported shearwall was designed to cross over the duct bank to the two (2) split pile caps. The Verizon duct bank affected fifteen (15) pile caps and one (1) grade beam, causing extra engineering and drafting.

McPherson Design Group completed extensive field investigation and contract documents for repairs to this two-story parking garage. The repairs included cracks that varied from hairline cracks to medium size cracks, and also included reflected ceiling overhead cracks, as well as topographic cracks.Repairs also included spalls, chips, and deterioration of stairs and handrails. The work had to be sequenced so that part of the garage could be kept open at all times, and protection had to be provided for vehicles. Repairs were completed with the latest state-of-the-art repair materials using epoxies by Sika.

This project included field investigation and contract documents for repairs to the parking garage. These areas were isolated and included areas where the soil had settled creating voids at two sides of the structure. We provided documents for the soil stabilization grout to be pumped into those areas to re-establish the original position. During our field investigation, minor slab cracks and damaged masonry were noted and they were delineated on the documents for repair. Another project included a preliminary site inspection of a large masonry crack over one door and cracked top courses of masonry at the contract beam at the north corner of the Garage. A written report was provided to the City with design for the repairs.

This project included our evaluation of the spalled bearing conditions of a beam adjacent to the front stairwell. The bearing plates and attachment inserts had rusted and caused the concrete to spall. This condition had obviously been repaired before; however, the continued corrosion had caused the repairs to spall off of the beam. Although this condition did not appear to be in danger of failure, we provided sketches for some supplementary shoring to ensure safety. We also recommended placing adjustable screw jacks under the beam to relieve the load on the connection and to prevent collapsing.

McPherson Design Group completed an initial study and repair documents for this 3,500-car garage. One main reason we were asked to complete the study was because this garage had more accidents than any other garage owned by the Federal Government. The result of the study brought about drastic changes in striping and signage to help reduce accidents. We also developed repair documents for failed control joints, failed expansion joints, spalls, cracks, etc. As part of our services, we provided construction administration.