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City of Everett Edgewater Creek Bridge Replacement <br /> WORK ELEMENT 12 STRUCTURAL DESIGN: <br /> This work element is performed by TranTech to provide structural design services. <br /> All structural design shall be per current WSDOT and AASHTO LRFD standards. WSDOT <br /> design standards shall control over AASHTO. <br /> This work element includes the following tasks: <br /> 12.1 Type, Size and Location (TS&L)Report <br /> The City desires the design team to prepare a TS&L Report to determine the most favorable <br /> design and location with respect to many variables (i.e.,pier placement, constructability, future <br /> maintenance, cost, etc.). The Report will describe the project, proposed structure(s), cost <br /> estimates, other design alternatives considered, and recommendations. The Report also <br /> provides justification for the selection of the preferred alternative. <br /> The design team will first review the project history in order to become familiar with the project. <br /> The environmental and design reports will be thoroughly reviewed. The bridge site data will be <br /> checked so that additional data, maps, or drawings can be requested. A meeting with the City and <br /> a site visit will be arranged after reviewing the history of the project. <br /> The geotechnical engineer of the design team will be contacted early in the TS&L process in <br /> order to provide preliminary foundation recommendations. Specific recommendations on the <br /> foundation type will be included in the TS&L Report. <br /> To determine the preferred structural alternative,the design team will perform the <br /> following: <br /> 1. A list of feasible alternatives will be developed. At this stage, the range of <br /> alternatives will be kept open. <br /> 2. The least desirable alternatives will be eliminated by applying the constraints of the <br /> project. The assumptions on any restrictions and constraints will be <br /> documented. There will be no more than four alternatives at the end of this step. <br /> 3. The viable alternatives will be advanced to approximately 10%design in order to <br /> develop cost estimate and perform attribute comparison. <br /> The structural studies document how the recommended alternative is determined. The following <br /> alternatives will be addressed: <br /> • Aesthetics <br /> • Foundations <br /> • Cost estimates <br /> • Geometric constraints <br /> • Feasibility of construction <br /> • Project staging and construction <br /> • Stage construction requirements <br /> Page 37 of 42 <br />