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HomeMy WebLinkAboutB12-0257 Mechanical StructuralBERGLUND Architects, LLC Page 1 of 1 P.O. Box 2378, Edwards, CO 81632 Tel: 970 926-4301 fax: 970 926-4364 October 21st, 2012 Martin Haeberle Building Official Community Development Department Town of Vail 5 South Frontage Road Vail, CO 81657 970.479.2128 970.479.2452 Fax Re: Cascade Garage Repair - Building Permit Submittal Dear Martin, Per our discussions per our meetings in early July, 2012 to review the code issues of the repair to the Cascade Garage, adjacent mechanical space and adjacent child care area per the damage caused by a car in late June 2012, we have observed the construction of the repairs and also have reviewed extensive photos taken by Ulf and Associates, the general contractor, and to the best of our knowledge all construction complies with our drawings, the mechanical and electrical drawings and to the current code. We visited the site throughout the construction process, but our site visits were not continuous or exhaustive. The fire department did their own inspections of the sprinkler system and fire alarm systems. Thanks for your assistance. Please call or email with any questions. Sincerely, Berglund Architects L.L.C. A Colorado Limited Liability Company 10-21-12 By: Hans Berglund Date CONSULTANTS, INC . structural engineering and design June 28, 2012 Ulf and Associates, LLC P.O. Box 509 Edwards, CO 81632 Re: KRM Job Number 1207-01 Vail Cascade Parking Garage - Repairs Vail CO 81657 Dear Sir : At the request of personnel from Ulf and Associates, I made a site visit to the above referenced property on June 26, 2012 to observe and comment on the general condition of the structure with regards to a large hole in the wall between the parking garage and the mechanical room. This hole was reportedly caused by a vehicular collision on June 24, 2012. PURPOSE AND SCOPE: The purpose of this structural observation and report is to review the damage caused by the vehicle crashing through the wall, to form an opinion regarding the present condition of this area, and to present our recommendations for repair. The opinions and comments in this report are based on visual observation of the current condition of the structure, and do not represent overall design review, structural analysis, or code compliance check. BACKGROUND: The primary structural framing system of this building consists of concrete walls with wide flange steel joists and concrete slabs over metal decking at the floors. The structure was reportedly built approximately 30 years ago. The lower level of the structure is used for parking, while the upper level is used for the spa area. None of the original construction documents were available at the time of this site visit. OBSERVATIONS: The wall that was damaged by the vehicular collision is located at the northwest corner of the parking area. The hole in the wall is approximately 8’-0” wide. One jamb of the 6’- 0” wide door is also missing, creating a total opening width of 14’-0”. The wall is approximately 10’ high. The bottom of this wall had been supported by a concrete slab, and the top of the wall was attached to the metal deck of the floor above. The upper portion of this wall was hanging from the metal deck at the time of our observation. The framing of the damaged wall consists of 4” metal studs spaced at 1’-4” on center. The wide flange beams supporting the metal deck above this wall are aligned parallel to this KRM Consultants, Inc. June 28, 2012 Vail Cascade Parking Garage – Repairs Job Number 1207-01 2 wall. The wide flange beams are not bearing on or connected to this wall. The wide flange beams and steel deck at the floor above this wall did not appear to have been affected by the collision. The floor slab below this wall did not appear to have been damaged by the vehicular collision. CONCLUSIONS: The damage to the wall is consistent with a vehicular collision. The force of the impact appears to have caused the wall framing to break away, allowing the vehicle to continue into the mechanical room. Based on the size and orientation of the observed framing members it appears that this wall is a non-structural wall. It is our opinion that the structural integrity of the building is not dependent on this wall. Therefore, it is structurally acceptable to remove the remaining portions of this wall so that repairs to the mechanical equipment may proceed. RECOMMENDATIONS: Although this wall is not a structural wall, it will likely be necessary to replace the wall for future use. As this wall is not near an open side of the parking garage, it is not required to act as a vehicle barrier. We recommend that the wall be rebuilt with 4” x 1- 3/8” flange x 20 gauge metal studs (ie. 400S137-33 studs) spaced at 1’-4” on center. Additional requirements for fire resistance at the wall may be necessary, and consultation regarding these requirements should be obtained from a qualified architect. At the building owner’s option, new bollards may be placed in front of the wall to inhibit future vehicular collisions with the wall. We can provide design recommendations for a vehicular barrier upon request. Please do not hesitate to contact us if you have any questions about this report, or if we can be of further service. Sincerely, J.R. Whipple, PE KRM Consultants, Inc. Structural Engineering and Design Reviewed by: Tim Hennum, PE