Bridge Maintenance and Design Criteria

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Questions and Answers

What is the primary purpose of traffic railings in bridge design?

To enhance aesthetic appeal of the bridge

To contain and redirect vehicles using the structure (correct)

To provide support for signage and lighting

To structurally support the bridge deck

Where is the deck level of low-level bridges typically placed?

Above the 5-year flood level

At the same level as the surrounding road

At an elevated level to improve visibility

Below the 1-year flood level (correct)

Which design aspect must be considered for bridge deck drainage?

Use of materials that can withstand high temperatures

Effective removal of runoff and discharge to existing systems (correct)

Incorporation of renewable energy sources

Aesthetic integration with the surrounding landscape

What design criteria must be evaluated for bridge clearances?

Navigation, air clearances, and underpasses Signup and view all the answers

In what situations are overflow type bridges particularly appropriate?

Low-traffic roads where conventional bridges cannot be justified Signup and view all the answers

What is the minimum vertical clearance required for bridges over rivers that carry debris?

1.50 m Signup and view all the answers

When selecting bridge locations, what primary factor should be considered to minimize costs?

Construction, maintenance, and replacement costs Signup and view all the answers

Which factor is NOT considered a geohazard in bridge design?

Construction materials Signup and view all the answers

What is a critical environmental consideration when designing a bridge near the sea?

Corrosive marine environment Signup and view all the answers

Which aspect of bridge design will influence the recommended foundation type?

Geological conditions Signup and view all the answers

Which environmental factor must be assessed to minimize potential damage in bridge design?

Local climate conditions Signup and view all the answers

What does the Rock Quality Designation (RQD) primarily indicate in bridge design?

Quality and integrity of rock formations Signup and view all the answers

Which phase of bridge design involves assessing existing bridge data?

Feasibility study phase Signup and view all the answers

What is the primary purpose of maintenance in bridge infrastructure?

To identify and address issues that contribute to deterioration. Signup and view all the answers

Which of the following actions best describes rehabilitation in bridge maintenance?

Making alterations and major repairs to reset deterioration. Signup and view all the answers

Which of these is a standard specification referenced for bridge design?

DPWH Standard Specifications for Highways, Bridges and Airports, 2013 Signup and view all the answers

What does the DPWH refer to in the context of guidelines for bridge design?

Department of Public Works and Highways Signup and view all the answers

What type of data might be included in a geotechnical investigation?

Borehole depths and soil stratigraphy. Signup and view all the answers

Which test is used during geotechnical investigations to evaluate soil properties?

Standard Penetration Test (SPT). Signup and view all the answers

What is a key outcome of the design criteria and specifications set by AASHTO?

Guidelines for bridge design consistency. Signup and view all the answers

Which of the following would NOT be considered a part of bridge rehabilitation?

Updating aesthetic features without structural changes. Signup and view all the answers

Study Notes

Maintenance and Rehabilitation

Maintenance: Aims to prolong bridge lifespan and slow deterioration by identifying and addressing contributing issues, such as performing minor repairs.
Rehabilitation: Involves repairing components of existing infrastructure to reset the deterioration process, including alterations, major repairs, and retrofitting.

Design Criteria

Governing Laws: Adhere to rules from implementing agencies like the Department of Public Works and Highways (DPWH).
Significant Guidelines:
- DPWH Standard Specifications for Highways, Bridges and Airports (2013).
- DPWH Bridge Seismic Design Specifications (December 2013).
- Additional guidelines from international and local organizations as per specific DPWH projects.

AASHTO Publications

Reference AASHTO 2012, LRFD Bridge Design Specification for guidelines on bridge design.

Design Data Requirements

Surveys: Conduct topographic and hydrographic surveys for site assessment.
Geotechnical Investigation: Includes borehole locations, depths, various lab tests (SPT, soil classification, etc.), and summary reports detailing soil and geological conditions.
Navigation Data: Observations and documentation of marine traffic, along with consultations with port operators and the Philippine Coast Guard.
Coastal Data: Assessment of tidal waves, storm surges, and tsunami forces for bridges near shorelines.
Geohazards: Consider risks from earthquakes, volcanic eruptions, storm surges, landslides, flooding, and impacts of climate change on design.
Environmental Factors: Evaluate local conditions to minimize environmental damage and address corrosive environments when adjacent to the sea.

Design Requirements

Bridge Location and Alignment: Favorable sites should be selected to minimize construction and maintenance costs during feasibility studies.
Waterway Considerations: Assess the length and span arrangement of the bridge.
Clearances: Ensure vertical clearance between the Design Flood Level (DFL) and the lowest member of the superstructure is at least 1.50 m for debris-carrying rivers and 1.00 m for others.
Low-Level Bridges: Designed for areas prone to flooding, appropriate for low-traffic roads where conventional bridge costs are impractical.
Deck Drainage: Design bridge decks with systems to remove runoff effectively, discharging into existing stormwater systems or other outlets.

Other Design Considerations

Clearances: Evaluate necessary navigational, air, highway, underpass, tunnel, and truss bridge clearances.
Traffic Railings: Design to contain and redirect vehicles, ensuring occupant safety in collisions and protecting pedestrians and vehicles on crossing roadways.
Curbs and Sidewalks: Include provisions for safety and traffic management in design specifications.

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Description

This quiz covers important aspects of bridge maintenance, rehabilitation, and design criteria. It focuses on the methods to prolong infrastructure usage and the relevant codes and specifications from governing laws. Test your knowledge on how to identify and address quality assurance in bridge management.