202 - General Design and Location Features

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202.3 - LOCATION FEATURES

202.3.3 - Clearances

202.3.3.4 - Railroad Overpass

SPECIFICATIONS COMMENTARY
The following shall supplement A2.3.3.4:

Railroad overpasses shall meet the minimum horizontal and vertical clearances as stipulated in Section 103.3.4.3 – Over Railroads and Section 103.3.5.3 – Over Railroads herein.

202.5 - DESIGN OBJECTIVES

202.5.2 - Serviceability

202.5.2.6 - Deformations

202.5.2.6.2 - Criteria for Deflection
SPECIFICATIONS COMMENTARY
The deflection control provisions of A2.5.2.6.2 shall apply to all bridge designs as modified below:

The following shall replace the third bullet of the third paragraph:

  • For composite design, the design cross-section used for the determination of the deflection and frequency should include the entire width of the roadway, neglecting any stiffness contribution by barriers, railings, or other secondary members of the bridge.
 C202.5.2.6.2

The following shall supplement AC2.5.2.6.2:

The weight of barriers, railings, or other secondary members shall be included for deflection and design. Only the stiffness of these items should be neglected.

202.5.2.6.3 - Optional Criteria for Span-to-Depth Ratios
SPECIFICATIONS COMMENTARY
The span-to-depth ratio provisions of A2.5.2.6.3 shall apply to all bridge designs.

202.5.2.7 - Consideration of Future Widening

202.5.2.7.1 - Exterior Beams on Multi-Beam Bridges
SPECIFICATIONS COMMENTARY
The following shall replace A2.5.2.7.1:

The load-carrying capacity of exterior beams shall not be less than the load-carrying capacity of an interior beam unless specifically approved by the Bridge Design Engineer.

C202.5.2.7.1

The following shall supplement AC202.5.2.7.1:

The stiffness of the interior and exterior beams should be relatively equal.

202.6 - HYDROLOGY AND HYDRAULICS

202.6.3 - Hydrologic Analysis

SPECIFICATIONS COMMENTARY
The following shall supplement A2.6.3:

Hydrologic analysis shall be completed in accordance with Section 104 – Hydrology and Hydraulics.

202.6.4 - Hydraulic Analysis

202.6.4.1 - General

SPECIFICATIONS COMMENTARY
The following shall supplement A2.6.4.1:

Hydraulic analysis shall be completed in accordance with Section 104 – Hydrology and Hydraulics.

202.6.6 - Roadway Drainage

202.6.6.2 - Design Storm

SPECIFICATIONS COMMENTARY
The following shall replace A2.6.6.2:

The design storm for bridge deck drainage shall be determined in accordance with Section 104 – Hydrology and Hydraulics herein and Section 6.3 – Design Criteria of the Road Design Manual.

202.6.6.4 - Discharge from Deck Drains

SPECIFICATIONS COMMENTARY
The deck drain provisions of A2.6.6.4 shall apply to all bridge designs, but as modified below.

The following shall replace the first bullet of the second paragraph:

  • All free-falling pipes from deck drains shall extend a minimum of 8 inches below any superstructure element within a 10-foot radius of the deck drain.
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