Các vấn đề phát triển LRFD

Các vấn đề phát triển LRFD

Grand Challenges:

A Strategic Plan for Bridge Engineering

NCHRP Project 20-07/Task 199

Final Report

Report from a Workshop in Woods Hole, Massachusetts

April 18-20, 2005

2000 WORKSHOP

A workshop was conducted February 14-16, 2000 in Irvine, California to develop a strategic plan for

bridge engineering

discussions Each thrust focuses on a specific

business need of the AASHTO bridge engineers

The unprioritized thrusts are as follows:

Systems, and Technologies;

and Construction;

Structural Performance;

and Maintenance; and

A second workshop was conducted April

18-20, 2005, in Woods Hole, Massachusetts, to refine the 2000

strategic plan

2005 WORKSHOP

The products of this workshop are a focused set of critical problems extracted from the

2000 strategic plan that, if solved, would

lead to significant advances in bridge engineering Borrowing from intellectual

competitions set in motion by German mathematician David Hilbert in 1900, these

critical problems are termed

“Grand Challenges.”

The prioritized grand challenges are:

Each “grand challenge” is defined through a brief statement of the challenge and anticipated

outcome, and discussions of the practical importance, the technical importance, and the readiness of the challenge to be solved Finally, lists of important activities/research areas and

minimum measures of success, called benchmarks, are included The benchmarks are grouped as: short term (in 2-3 years), mid-term (in 4-5 years) and long term (beyond 5 years.)

GRAND CHALLENGE 1:

EXTENDING SERVICE LIFE

To understand the processes that decrease the serviceability of existing bridges and highway structures, and to develop approaches to preserve (maintain and rehabilitate) the existing system by

managing these processes

Anticipated Outcome:

Strategies to extend the service life of existing inventory of bridges and highway structures

GRAND CHALLENGE 2:

OPTIMIZING STRUCTURAL SYSTEMS

To understand the advantages and limitations of traditional, newer and emerging materials in terms

of safety, durability and economy; and to develop structural systems (optimized materials, details, components, structures and foundations) for

bridges and highway structures that efficiently

to assure a safe, minimum 75-year service life

Anticipated Outcome:

Structural systems which utilize existing and new materials more efficiently in terms of

safety, durability and economy

GRAND CHALLENGE 2:

OPTIMIZING STRUCTURAL SYSTEMS

(continued)

GRAND CHALLENGE 3:

ACCELERATING BRIDGE CONSTRUCTION

economy of traditional bridge systems and their construction methods, and the possibilities and limitations of newer accelerated methods, and to

develop enhanced systems and accelerated

methods overcoming traditional time-restraints while maintaining, or enhancing, safety, durability

and economy

Anticipated Outcome:

Strategies to accelerate the construction of

safe, durable and economical bridges; both the construction of new bridges and highway structures, and the rehabilitation of existing

ones

GRAND CHALLENGE 3:

ACCELERATING BRIDGE CONSTRUCTION

(continued)

GRAND CHALLENGE 4:

ADVANCING THE AASHTO SPECIFICATIONS

To understand the limit states required for safe, serviceable and economical bridges and highway structures, and to develop enhanced reliability-based provisions addressing these limit states in a manner relatively consistent with traditional design

practice and effort

Anticipated Outcome:

GRAND CHALLENGE 5:

MONITORING BRIDGE CONDITION

To understand what information should be

collected from which structural components to

structure (both superstructure and substructure), and to develop systems to capture this information and approaches to use it to extend the service life

of bridges and highway structures through efficient

asset management

Anticipated Outcome:

Monitoring systems and strategies to assist in

more efficient management of existing

bridges and highway structures

GRAND CHALLENGE 5:

MONITORING BRIDGE CONDITION

(continued)

GRAND CHALLENGE 6:

CONTRIBUTING TO NATIONAL POLICY

consequences affecting transportation systems, and

to develop approaches to enhance the bridge

engineer’s contribution to political and social policy development, and to develop contributions to policy

decisions

Anticipated Outcome:

Strategies in which bridge engineers to more

effectively contribute to transportation-policy

GRAND CHALLENGE 7:

MANAGING KNOWLEDGE

To understand the existing approaches to

management and dissemination of

bridge-engineering knowledge, and to develop new more-effective approaches consistent with the evolving bridge-engineering community and emerging

technology

Anticipated Outcome:

Strategies to cultivate and support a knowledgeable

DISSEMINATION PLAN

workshop reports on an appropriate website

notes based upon the presentation for the AASHTO T-11 technical committee

in Newport, Rhode Island

3 A concise executive summary based

upon the workshop report for use as a handout

report with a forward by the T-11 chair (drafted by the contractor) submitted

as a committee report to the ASCE

and possible publication (the forward will discuss the significance of the

strategic plan to the research

5 Presentations during the Structures

Section committee meetings (by the committee chairs, or the contractor at the direction of each chair) at the TRB Annual Meeting

members of the bridge-engineering community (including all state bridge engineers, all civil engineering

departments at universities in the US and the consultants) consisting of the executive summary and a link to a

website containing the workshop report