The MnDOT Bridge Load Rating Manual Scope of Work and Deliverables

Transcription

1 The MnDOT Bridge Load Rating Manual Scope of Work and Deliverables MnDOT Contract No Project Overview The State of Minnesota (STATE) has identified the need to compile a comprehensive manual to address and update bridge load ratings, overweight load permitting, and bridge evaluation with MnDOT current practices, polices, state laws to be published by the Bridge Office. The manual shall include bridge evaluation processes, quality assurance and quality control (QA/QC) processes, and load rating examples for different bridge types on the state and local roadway system. Tasks and Deliverables 1.0 Project Administration and Meetings STATE will provide a Project Manager to give direction to CONTRACTOR s activities. It will be the responsibility of STATE s Project Manager to receive the work produced by the CONTRACTOR, review the work for accuracy and compliance with STATE and federal standards, and to recommend payment for such work. CONTRACTOR will conduct the administration of the project, which will include communication with STATE, invoicing, preparation of any necessary supplemental agreements, cost and schedule updates, and other non-technical work. No changes in CONTRACTOR project management or lead design personnel will be permitted without prior written notice to STATE s Project Manager. STATE will notify CONTRACTOR immediately if there are changes to STATE s assigned project management personnel. 2.0 Requirements for the Manual The manual shall include the following: Definitions for bridge load ratings, load postings, and bridge closure Definitions and procedure for load rating methods, LRFR, LFR, and ASR. Requirements and guidelines for use of each method. Requirements and guidelines for use of special load rating methods, such as physical inspection rating and field load testing Why a bridge load rating is needed, when a load rating for a new structure is required, at what conditions a re-rating of an existing structure is required When the standard overweight permit loads shall be used, when load posting shall be considered, and when a bridge shall be closed Load rating requirements for new structures and structure repair projects Load rating analysis and software selections for standard and complex bridge structures and buried structures -1-

2 Differences between MnDOT load rating policy and AASHTO Manual for Bridge Evaluation, refined analysis, and 2D/3D modeling requirements Load rating requirements and guidelines for complex bridges Load rating requirements and guidelines for curved and skewed steel bridges Load rating requirements and guidelines for inverted T beam bridges, truss bridges, and timber bridges Special considerations for existing bridge repair projects, such as material records, prestressed concrete beam shear capacity, pier cap evaluation, and field material testing Evaluation policies for substructures of existing bridge repair projects Load rating requirements and guidelines for concrete and metal culverts Bridge load posting process and bridge closure process including analysis requirements and signage requirements Overweight permit bridge check process Special requirements for bridges owned by local agencies QA/QC processes, documentation, and submittal and filing requirements Provide three LRFR load rating examples shown below. Examples can be built from the MnDOT LRFD Design Manual examples. Design calculations, will be provided by STATE. Each example shall include an AASHTOWare BrR xml input file. o One load rating example for a prestressed concrete beam bridge o One load rating example for a straight steel plate girder bridge o One load rating example for a continuous concrete slab span bridge 3.0 Table of Contents 3.1 Information Gathering CONTRACTOR will review the existing information provided by STATE, the Manual for Bridge Evaluation by AASHTO, and load rating manuals from other agencies. Part of this task will also involve identifying gaps and inconsistencies in the documents provided. A summary report of the findings will be prepared for STATE review. The comments generated from the review will then be incorporated into the report. Contractor will plan a minimum of one meeting to accomplish this task. Initial Findings Report Lists and Sources of Existing Documents Draft LRFR bridge load rating guidance MnDOT LRFD Bridge Design Manual -2-

3 Draft QA/QC guidance Section A.8 Bridge Load Ratings in Bridge and Structure Inspection Program Manual, Other related materials (NHI class material, LRFR training material) Design example calculations from MnDOT LRFD Bridge Design Manual Task Group Participants (attached) 3.2 Table of Contents STATE will provide the initial Table of Contents. CONTRACTOR will work with STATE to complete the Table of Contents based on above tasks. CONTRACTOR will submit updated table of contents for review and comments. Comments will then be incorporated and the final table of contents will be completed and submitted to the Task Group for approval. Contractor will plan a minimum one meeting to accomplish this task. Final Table of Contents for the MnDOT Bridge Load Rating Manual Initial Table of Contents for the MnDOT Bridge Load Rating Manual 3.3 Format of the Manual Contractor will work with the State s input to identify the format that is similar to other MnDOT manuals, such as MnDOT Bridge and Structure Inspection Program Manual, MnDOT LRFD Bridge Design Manual, and Handbook of MN Snow and Ice Control Sample of electronic file format. Web links to example manuals All deliverables for Task 1, 2, and 3 shall be completed by June 30, Contents of Manual 4.1 Contents of Bridge Load Rating Process This task will complete all required content based on above task 2 and task 3 All information will be formatted based on above tasks and will be submitted to the STATE for review and comment. The submittals shall be planned at 30% completion, 60% completion, and 95% completion. CONTRACTOR will plan a minimum of three meetings with the State to coordinate these efforts and gain input. -3-

4 30% manual 60% manual 95% manual Complete Set of sections of the bridge evaluation process MnDOT Contract No Contents of QA/QC Process This task will include both revisions and additions of all required content. The content of QA/QC processes shall include at least the definitions, conditions, and detailed steps. All information will be formatted based on above tasks and will be submitted to the Task Group for review and comment. Complete Set of sections of the QA/QC process 4.3 Contents of Bridge Load Rating Examples This task will include three bridge load rating examples, one for prestressed concrete beam, one for straight steel plate girder, and one for concrete slab span bridge. The format of the examples shall be similar to MnDOT LRFD Bridge Design Manual. The load rating calculations of each example can be built from the design calculations and STATE will provide all design calculations to CONTRACTOR. All information will be formatted based on above tasks and will be submitted to the Task Group for review and comment. CONTRACTOR will plan a minimum of one meeting for each example with the State to coordinate these efforts and gain input. Complete Set of each example including AASHTOWare BrR xml input file Bridge design examples from MnDOT LRFD Bridge Design Manual 4.4 Drafting and Photos CONTRACTOR will recreate all existing details that will be included in the Manual for Bridge Evaluation and draft new details as directed by the STATE. The details will be submitted to the State in Microstation format and will also be formatted, titled and inserted into the Manual for Bridge Evaluation as figures. Details must be in a consistent format and in English units. Contractor will also incorporate photos provided by the State into the appropriate sections of the Manual for Bridge Evaluation. -4-

5 Details in Microstation format Incorporated details and photos into the document of the MnDOT Bridge Load Rating Manual List of Existing Details Photos to be included in the MnDOT Manual for Bridge Evaluation 4.5 Prepare Draft Manual for Approval Contractor will compile a complete draft of the MnDOT Bridge Load Rating Manual for review by the STATE. This task will include organizing all the documents into a consistent file format including graphics and text. Each manual section will remain as a separate file. Complete draft version of MnDOT Bridge Load Rating Manual shall be completed by April 30, Final Manual This task will include making revisions to the draft manual based on comments from State and other agencies. Final Approved MnDOT Bridge Load Rating Manual for publication and distribution by the State Bridge Office in word document format and smart PDF format will be completed by June 30, THE BALANCE OF THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK -5-