Laserfiche WebLink
Printed on:Monday 03/24/2025 11:55 PM 29C0131/AABH/149249Pageof3 <br />Department of Transportation - Division of Maintenance Structure Maintenance & Investigations <br />13 <br />UNDERWATER INVESTIGATION DETAILS <br />STEEL INVESTIGATION DETAILS <br />This structure qualifies for an in-depth Steel investigation because it possesses the following non-redundant steel tension members <br />(NSTM) or fatigue prone details : <br />NSTMI Required NSTMI Freq.Next NSTM InspectionYes24 01/29/2027 <br />Floor Beams: NSTM, <br />Truss: NSTM with Category E Welds <br />SCOPE AND ACCESS <br />A non-redundant steel tension member (NSTM) inspection was performed on 01/29/2025 Jacob Hurd from the Office of Specialty <br />Investigations. <br />The structure was accessed with the UBIT operated by Eric Castro and with a lift truck. Lane closures and traffic control were provided by <br />San Joaquin County. <br />The investigation was conducted in accordance with the Non-redundant Steel Tension Member Inspection Plan, dated 01/29/2025. <br />This inspection was performed on a plus three month interval due to the UBIT being repaired in the shop. <br />NON-REDUNDANT STEEL TENSION MEMBER INSPECTION <br />A hands-on visual inspection was performed on: (i) the tension members of the steel trusses including steel gesset plates in Spans 1 <br />and 2, and (ii) the steel floor beams in Spans 1 and 2. No fractures or cracks were found. <br />There were no changes in the condition of Members U2-L2, U3-L3 and U7-L7 of the left truss, and U3-L3 of the right truss that are <br />each bent inward approximately 1/2"-3/4" at the lower portal bracing connections. The member distortions were apparently caused by <br />repeated high load hits of the bracing. <br />There was no change in the condition of the vertical notch in the web of Stringer 4 at Floor Beam 4 in Span 1, located at the end of the <br />coped flange of the stringer. This defect will continue to be monitored in future non-redundant steal tension member inspections, even <br />though the stringers are not NSTMs. <br />INSPECTION COMMENTARY <br />3 - BrackishWater TypeB - Routine UWDive Type <br />Next UWI 08/31/2025UWI Frequency months 60UWI Required Y Last UWI 08/31/2020 <br />Last NSTMI 01/29/2025 months <br />CONDITION INFORMATION <br />SPECIAL INSPECTION INFORMATION