# B3 -- Structural Design and Check

Structural analysis, design, and check of the structure. Draft contract
plans, prepare specials and the engineer's estimate.

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  *The following list of typical tasks is based on and supplement the
  documents referenced in Section V of this SOW and the CFLHD Standard P3
  Template Activities. However, it may be appropriate to add, delete, or
  modify tasks to meet project specific requirements.*

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1.  Structure Site Visit -- Not Applicable *See Comment Below*

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  *For this task, it is assumed that the site visit was performed during
  the interdisciplinary project scoping. For TS&Ls prepared by the FHWA,
  delete " - Not Applicable" in the Task heading and add the following
  paragraph.*

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For *Structure Preliminary Layouts (TS&Ls)* prepared by the FHWA, travel
to the project site with the COTR or designated representative and
review proposed bridge layout. Prepare and submit a trip report to the
FHWA containing a summary observations and discussions.

2.  Structure Design Criteria

> Following the template referenced in Section III, prepare a project
> specific Structure Design Criteria document.

Obtain acceptance by CFLHD of the *Structure Design Criteria* prior to
beginning work on Task B3-3 -- Structure Preliminary Study.

3.  Structure Preliminary Study

> For the approved *Structure Preliminary Layout (TS&L)* prepare a
> Structure Preliminary Study. Perform sufficient structural
> investigations to determine approximate dimensions (and reinforcing)
> for the items listed below. Provide preliminary calculations and
> preliminary CADD drawings and details for the items listed below.

-   Preliminary Plan Sheets

    -   A and B Sheets as described under Task 7 -- Structure Drawings

    -   Typical Bridge Section

    -   Deck slab

    -   Bridge railing

    -   Girders

    -   Staged Construction Sequence

    -   Aesthetic Treatments

-   Preliminary Structure Special Contract Requirements

-   Preliminary Itemized Cost Estimates

4.  Plan-in-Hand Field Review

> Review trips are covered under Section II-M.

5.  Structure Final Design

> For the items listed below (as a minimum) prepare design calculations.
> Design calculations shall be annotated with specific references to the
> applicable design specification sections.

-   Superstructure

-   Connections

-   Substructure

-   Foundations

6.  Structure Independent Check

> Prepare independent design calculations. The independent check will
> verify design methods, functional requirements, and conformance to
> design criteria, and completeness and accuracy of the contract plans
> including reinforcing bar sheets. Check calculations shall be
> annotated with specific references to the applicable design
> specification sections.

7.  Structure Drawings

> Prepare structure drawings that show all details necessary for
> construction of the bridge. See the Federal Lands Highway Bridge
> Office (FLHBO) Bridge Plan Checklist, specified in Section III, for
> items to be included in the structure drawings.
>
> The following is an estimate of the contract plan sheets required for
> a typical simple span structure:

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  **Sheet**   **Description**              **Sheet**   **Description**
  ----------- ---------------------------- ----------- ----------------------------
  A           Plan View, Elevation View,   J           Girder Framing Plan
              General Notes, Profile Grade             
              Diagram                                  

  B           Foundation Plan, Subsurface  K           Girder
              Profile, Estimate                        

  C           Slope Protection             L           Girder Details

  D           Construction Staging         M           Typical Section

  E           Abutment 1 Cap               N           Deck Plan

  F           Abutment 2 Cap               O           Bridge Railing

  G           Abutment 1                   P           Bridge Railing Endblock

  H           Abutment 2                   Q           Transition Railing

  I           Wingwalls                    R-T         Rebar List
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8.  Structure Quantities and Unit Costs Analysis

Plan item quantity calculations and quantity check calculations.

> Documentation of plan items unit costs analysis.

9.  Structure Load Rating Report

> Load rating notes, assumptions and calculations.

Complete FHWA Load Rating form, specified in Section III.

10. Structure Special Contract Requirements

> Review Structure Special Contract Requirements provided by FHWA.

Prepare unique Structure Special Contract Requirements required by the
design.

11. 95% Structural PS&E Package Submittal

> Prepare and submit the following items to FHWA for review and approval
> and inclusion into 95% PS&E submittal:

-   Structure Special Contract Requirements

-   Structure Drawings

-   Summary of Structure Quantities

Deliverables for B3

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  *Add/delete deliverables to correspond to the tasks above. Typically 1
  copy of the site visit trip report, 1 copy of the DRAFT design
  criteria, 1 copy of the FINAL design criteria, and 1 copy of the FINAL
  preliminary study are submitted. Coordinate number of copies with COTR.
  Number of copies and submittal dates shall be shown in Section IV,
  Deliverables and Schedule.*

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-   Structure Site Visit Trip Report

-   Structure Design

-   Structure Preliminary Study

-   Structure Final Design and Special Contract Requirements (include in
    PS&E package)