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HomeMy WebLinkAboutEngineer Report 09.11.17()d £7431)4 0 f/'Ll~IJ!!i] CIVIL. S'I'H£lO'I'£lRAL!llA'I'.EHLlLS H.l,,-VLIJl•(,J_Iil_NG.IN'EERS DATE: 11September2017 PROJECT: Metal Building Structure TO: Brett Closs Brett. 5175 Grass Mesa Road Rifle, Colorado 81650 448 Will Avenue Rifle, Colorado 81650 970-625-2774 Phone westar@rof.net E-Mail As you requested I have reviewed the original steel building plans issued in June 1998 along with the new steel building plans issued in July 2017 that you provided. The existing steel building was designed by Sunward Corporation, and the new steel building is being designed by B&C Steel. I offer the following information. 1. The original steel building and foundation had been in place for several years. Both steel buildings were designed for a roof snow load of 60 psf. The GARCO snow load for a site elevation of 7, 100-8,000' ASL is 50 psf. You should verify that your site elevation falls withing this range. The site wind design criteria has been upgraded since the original building was designed, and may account for a portion of the base reaction increases. 2. It appears that most of the new building columns will be placed near the existing building column locations. The exception is Line 4 which originally had (4) end wall columns, but the new building has only (3). The main building frame locations appear to be very close to that of the original building main frame locations. 3 . The new building main frame column base reactions appear to be withing about 1, 100 lbs, of the original building, with the other column base reactions being similar except for C4. The actual required roof snow load of 50 psf vs the design snow load of 60 psf could result in the actual differences in column base reaction being negligible as to actual foundation load increases. However, the new single building column at Line C4 will impart a greater foundation load, and at a different location than the original building column arrangement along Line 4. 4 . A foundation concrete evaluation was performed by HP-Kumar on 27 June 2017. The results indicate that the actual concrete strength meets or exceeds a design strength of 4,000 psi which is sufficient for this type of structure. 5 . It appears that the new building main frame anchors do not match with the original building anchors. You informed me that you plan to use epoxy anchors for the new building columns. You need to insure that all anchors meet the requirements as shown on the new steel building drawings and details, and that the installation, minimum embedment, minimum edge distances, and minimum concrete thicknesses meet the requirements as outlined by the manufacturer of the epoxy anchor system that you select. 6. You should note that I have not performed any site inspection or analysis of the existing foundation elements since sufficient foundation design details and soils information was not available for review. Page 1 of 2 This letter in no way provides any certification of any foundation inspections, nor does it indication or express any certification to the adequacy of the existing foundation for support of the new steel building structure. 7 . Westar, Inc. will not accept any liability or responsibility for the design or adequacy of the new steel building, or for the design or adequacy of the existing foundation. The full responsibility for use of the existing foundation for the support of the new steel building shall remain with you. Please contact me if you have any questions about this letter. Sincerely, Stephen A. Kesler Stephen A. Kesler, P .E. President xc: File Page 2 of 2