Bridge Design and Evaluation: LRFD and LRFR by Gongkang Fu

By Gongkang Fu

A succinct, real-world method of entire bridge procedure layout and evaluation

Load and Resistance issue layout (LRFD) and cargo and Resistance issue score (LRFR) are layout and overview equipment that experience changed or provided choices to different conventional equipment because the new criteria for designing and load-rating U.S. road bridges. Bridge layout and Evaluation covers whole bridge structures (substructure and superstructure) in a single succinct, potential package deal. It offers real-world bridge examples demonstrating either their layout and assessment utilizing LRFD and LRFR. Designed for a three- to 4-credit undergraduate or graduate-level direction, it provides the basics of the subject with no increasing needlessly into complicated or really good themes.

Important positive factors contain:

  • Exclusive specialize in LRFD and LRFR
  • Hundreds of pictures and figures of actual bridges to attach the theoretical with the practical
  • Design and overview examples from actual bridges together with genuine bridge plans and drawings and layout methodologies
  • Numerous workout problems
  • Specific layout for a three- to 4-credit path on the undergraduate or graduate level
  • The simply bridge engineering textbook to hide the $64000 issues of bridge evaluate and rating

Bridge layout and Evaluation is the main updated and inclusive creation on hand for college students in civil engineering focusing on structural and transportation engineering.Content:
Chapter 1 advent (pages 1–14):
Chapter 2 standards for Bridge layout and evaluate (pages 15–46):
Chapter three lots, Load results, and cargo mixtures (pages 47–99):
Chapter four Superstructure layout (pages 101–301):
Chapter five Bearing layout (pages 303–333):
Chapter 6 Substructure layout (pages 335–393):
Chapter 7 street Bridge overview (pages 395–420):

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Extra resources for Bridge Design and Evaluation: LRFD and LRFR

Example text

For example, a shallow concrete overlay may be selected to improve a bridge deck’s condition and create a smoother riding surface. This will not result in a higher level of structural capacity but it costs less than replacing the bridge. Some load and resistance factors in the AASHTO design and evaluation specifications have been determined according to this concept of different 27 28 2 Requirements for Bridge Design and Evaluation safety or reliability requirements. On the other hand, it should be noted that current AASHTO design and evaluation specifications have not been developed to such a stage that they completely reflect this concept of a rationally relative relationship in terms of distinct reliability requirements.

Inaccessible cavities and corners should be avoided. Cavities that may invite human or animal inhabitants shall either be avoided or made secure. Maintenance of traffic during rehabilitation or replacement of bridge components or the entire bridge is often required since completely closing the road for such maintenance operations is unacceptable to the traveling public. In general, two options may be available: (1) staging rehabilitation or replacement construction by using partial width of the road and (2) utilization of an adjacent parallel structure.

Calibration of Specifications This process was used to determine the load and resistance factors in the specifications. 4-14) where ϕ R , γ D , and γ L are factors for resistance, dead load, and live load, respectively, they were determined in the calibration and Rn, Dn , and L n are the nominal values of the resistance, dead load, and live load. The subscript n indicates nominal value. 4-16) where λR is the bias factor for resistance. This relation also helps quantify the relation between the process of design using nominal values and the process of reliability index computation using the mean µ and standard variation σ .

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