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HomeMy WebLinkAboutAgenda Report - September 6, 2017 C-05TM CITY OF LODI COUNCIL COMMUNICATION AGENDA ITEM C -5 AGENDA TITLE: Approve Plans and Specifications and Authorize Advertisement for Bids for Lodi Station Parking Garage Maintenance and Repair Project MEETING DATE: September 6, 2017 PREPARED BY: Public Works Director RECOMMENDED ACTION: Approve plans and specifications and authorize advertisement for bids for Lodi Station Parking Garage Maintenance and Repair Project. BACKGROUND INFORMATION: The Lodi Station Parking Garage, located at 50 North Sacramento Street, was constructed in 2002, using post -tensioned concrete. Due to the age of the facility and observations of cracks in the concrete and masonry, staff hired Siegfried Engineering, Inc. of Stockton, in October 2016, to conduct a structural assessment of the structure. The assessment report (Exhibit A) identified several issues that need to be addressed in order to maintain the parking structure's long-term structural integrity. It must be emphasized that none of the identified deficiencies pose a risk to the public at this time. This project will perform various minor structural repairs recommended by Siegfried Engineering, Inc. to repair cracks in the concrete columns, beams, and concrete decks. The project will also replace some exterior veneer panels that were damaged by vehicles; and address other miscellaneous improvements needed to extend the life of the parking structure. The plans and specifications are on file in the Public Works Department. The planned bid opening date is October 12, 2017. The project estimate is $300,000. FISCAL IMPACT: The repair will extend the useful life of the parking structures. FUNDING AVAILABLE: Transportation Development Act (TDA) Fund Charles E. Swimley, Jr. Public Works Director Prepared by Lyman Chang, City Engineer/Deputy Public Works Director CES/LC/tdb Attachment cc: Transportation Manager/Senior Traffic Engineer Public Works Management Analyst City Engineer/Deputy Public Works Director Siegfried Engineering, Inc. APPROVED: rl• Sc w!er, City Manager K:\WP\PROJECTS\TRANSIT\Lodi Station Parking Structure\2017 Structural Repair\CPSA.doc 8/22/2017 SIEGFRIED June 7, 2017 Lyman Chang City of Lodi Public Works Department 221 W. Pine Street Lodi, CA 95240 Dear Mr. Chang: Subject: Lodi Station Parking Garage Structural Investigation Enclosed you will find a set of construction documents for the Lodi Station Parking Garage repair project. This includes; 1. A plan set that includes the locations of all repairs. We conducted detailed field reviews of all potential repair features and have identified them on the plans. We also list two tables, one identifying required repairs and repair priority and a second table indicating ongoing maintenance activities recommended for this building. 2. A copy of the Geotechnical Engineering Report performed by Terracon Consultants, Inc., dated March 21, 2017. As a follow up to our April 29th, 2016 Structural Investigation Report and our "Draft" report dated February 17, 2017, the following is a brief summary of our additional findings and recommended actions for each item identified. 1. Column To Beam Cracks Our report referred to numerous cases where the columns have diagonal cracks at their intersection with the deck beams. These cracks are in areas of very high shear stresses and were of immediate concern. We have conducted additional measurements and found most of the cracks to be less than 0.020 inches in width. The fissures in the paint and the accumulation of efflorescence due to moisture weeping through the cracks makes most of them appear worse than they actually are. In general, these cracks do not represent a structural hazard for current service loads. We recommend sealing the cracks and painting the columns to prevent the intrusion of moisture and additional deterioration. We also recommend regular period inspection of this condition. We did find one column at the intersection of grids B & 14 with cracks up to 0.035 inches in width. This crack width is an indication of potential structural disrepair. Therefore, we recommend more significant structural repairs for this condition as indicated on the attached plans. Stockton 3244 Brookside Rd., Ste. 100 Stockton, CA 95219 t: 209.943.2021 f: 209.942.0214 San Jose 111 N. Market St., Ste. 300 San Jose, CA 95113 t: 408.754.0121 Sacramento 109 Scripps Drive Sacramento, CA 95825 t: 916.520.2777 Page 1 of 3 l■ MT SIEGFRIED In addition to our visual observations and measurements, we conducted a structural analysis of the beam to column joints based on the 1997 Uniform Building Code which was in effect at the time of design and construction. Initially, we had reported a potential overstressed condition due to the seismic load effects considered in our preliminary analysis. However, a more thorough analysis and review of construction documents seems to indicate the original designer did not consider these frames in the resistance of seismic loads. Using a rigid diaphragm analysis, the majority, if not all, of the seismic load is considered to be resisted by the shearwalls at the north and south ends of the building. Based on this analysis and Building Code prescriptions at that time, the beam to column joints appear to be designed in accordance with the Building Code. We determined the building columns to have an ultimate shear capacity 140 kips. The maximum calculated ultimate load in our analysis was 140 kips. Therefore, the columns are reinforced at 100% capacity, satisfying the building code criteria. The attached geotechnical report indicates the possibility of foundation settlement. This settlement, if it has occurred, would increase column shear stresses by another 5 to 10%. Though not desirable, this slight overstress is not significant enough to make this structure unsafe. Please note, the analysis performed only addressed the observed diagonal shear cracks. We did not analyze other beam, column and slab elements. 2. Other Column Cracks In addition to the diagonal column cracking in item 1 we observed horizontal cracking in many columns. Generally, we found these cracks to be non-structural and not affecting the structural integrity of the building. We recommend sealing and painting the structure to minimize moisture intrusion into these cracks. Over time, the cracks will likely reappear and require ongoing maintenance as indicated on the plans. 3. Slab Cracks As previously reported, these cracks do not currently compromise the structural integrity of the slabs but should be sealed to prevent further deterioration. The plans have denoted their location and approximate total lengths. In regards to the spalled slab areas, this will require a more substantial structural repair. Details of the crack and spall repairs are presented on the attached construction documents. 4. Beam Cracks As previously indicated, we found several isolated conditions where beams have experienced diagonal cracking as shown in photo 5 of the initial report. At this time, the cracking is relatively minor and does not represent a structural hazard. We recommend the cracks be sealed to prevent further structural deterioration. 5. Masonry Walls As previously identified, most instances of vertical and diagonal wall cracks were caused by the lack of control joints. In addition, settlement as identified in the Geotechnical Investigation has likely contributed to some of the cracking observed. Overall, these cracks do not affect the structural integrity of the walls. However, they will continue to be a cosmetic nuisance as they will open and close with seasonal changes in temperatures. Stockton 3244 Brookside Rd., Ste. 100 Stockton, CA 95219 t: 209.943.2021 f: 209.942.0214 San Jose 111 N. Market St., Ste. 300 San Jose, CA 95113 t: 408.754.0121 Sacramento 109 Scripps Drive Sacramento, CA 95825 t: 916.520.2777 Page 2 of 3 d ■ WI SIEGFRIED We recommend repairing these cracks as depicted on the attached plans including; a. Sealing the cracks, and b. Sawcutting the wall in select locations to create control joints and minimize future cracking and maintenance. 6. Elevator Towers The Geotechnical Investigation included one boring at each elevator tower. Their findings indicate some differential settlement of the towers, causing the slight outward lean. Through subsequent vibration monitoring, Terracon has determined that settlement has likely ceased. At this time, the settlement has not affected the structural integrity of towers. However, a portion of the north tower wall above the 3rd level will require repair.Currently this does not represent a hazard. 7. Museum Area We investigated the rusted roof framing and beam to beam connections and found the structure and it's connections to be in good condition. The moisture intrusion problem should be remedied immediately to prevent any further deterioration. The plans detail the sealing of the parking garage roof deck above to help minimize moisture intrusion into this location. 8. Miscellaneous Refer to the plans for various cosmetic repair locations We trust this information will be of assistance in the continued repair and maintenance of this building. Please review and provide comments on this report and the attached documents. If you should have any questions or need additional information, please do not hesitate to give us a call. Sincerely, SIEGFRIED N9 Q' LIJ NO. S-4550 cc Exp. 12/31//7 Ls) s�CT, of CAoj G-7 /7 Stockton 3244 Brookside Rd., Ste. 100 Stockton, CA 95219 t: 209.943.2021 f: 209.942.0214 San Jose 111 N. Market St., Ste. 300 San Jose, CA 95113 t: 408.754.0121 Sacramento 109 Scripps Drive Sacramento, CA 95825 t: 916.520.2777 Page 3 of 3 CITY COUNCIL DOUG KUEHNE, Mayor ALAN NAKANISHI, Mayor Pro Tempore MARK CHANDLER BOB JOHNSON JOANNE MOUNCE CITY OF LODI CITY HALL, 221 WEST PINE STREET P 0. BOX 3006 LODI, CALIFORNIA 95241-1 91 0 (209) 333-6706 / FAX (209) 333-6710 EMAIL: pwdept@lodi.gov www lodi.gov August 31, 2017 Siegfried Engineering, Inc. 3244 Brookside Road, Suite 100 Stockton, CA 95219 Attn; Anthony L. Lopes, P.E., S.E. STEPHEN SCHWABAUER City Manager JENNIFER M. FERRAIOLO City Clerk JANICE D. MAGDICH City Attorney CHARLES E. SWIMLEY, JR. Public Works Director SUBJECT: Approve Plans and Specifications and Authorize Advertisement for Bids for Lodi Station Parking Garage Maintenance and Repair Project Enclosed is a copy of background information on an item on the City Council agenda of Wednesday, September 6, 2017. The meeting will be held at 7 p.m. in the City Council Chamber, Carnegie Forum, 305 West Pine Street. This item is on the consent calendar and is usually not discussed unless a Council Member requests discussion. The public is given an opportunity to address items on the consent calendar at the appropriate time. If you wish to write to the City Council, please address your letter to City Council, City of Lodi, P. O. Box 3006, Lodi, California, 95241-1910. Be sure to allow time for the mail. Or, you may hand -deliver the letter to City Hall, 221 West Pine Street. If you wish to address the Council at the Council Meeting, be sure to fill out a speaker's card (available at the Carnegie Forum immediately prior to the start of the meeting) and give it to the City Clerk. If you have any questions about communicating with the Council, please contact Jennifer M. Ferraiolo, City Clerk, at (209) 333-6702. If you have any questions about the item itself, please call Lyman Chang at (209) 333- 6706. Charles E. Swimley, Jr. Public Works Director CES/td b Enclosure cc: City Clerk