Bridge Design and Evaluation: LRFD and LRFR by Gongkang Fu

By Gongkang Fu

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

Load and Resistance issue layout (LRFD) and cargo and Resistance issue ranking (LRFR) are layout and overview tools 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 assessment covers entire bridge platforms (substructure and superstructure) in a single succinct, achievable package deal. It provides real-world bridge examples demonstrating either their layout and evaluate utilizing LRFD and LRFR. Designed for a three- to 4-credit undergraduate or graduate-level direction, it offers the basics of the subject with out increasing needlessly into complicated or really good topics.

Important gains include:

Exclusive specialize in LRFD and LRFR
Hundreds of photos and figures of genuine bridges to attach the theoretical with the practical
Design and overview examples from actual bridges together with real 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 basically bridge engineering textbook to hide the $64000 themes of bridge evaluate and rating
Bridge layout and review is the main updated and inclusive advent to be had for college kids in civil engineering focusing on structural and transportation engineering.

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Additional resources for Bridge Design and Evaluation: LRFD and LRFR

Example text

The load and resistance factors presented in Chapter 3 are meant to address these uncertainties as the sources of failure risk. The design and evaluation methods prescribed in the AASHTO LRFD and LRFR specifications are referred to as calibrated because their load and resistance factors are selected along with the associated nominal loads and resistances to maintain the failure risk at an acceptable level. This section will briefly discuss the calibration conducted for the AASHTO LRFD and LRFR specifications.

On the other hand, lateral torsional buckling of the beam is viewed as an example of the global stability limit state. The corresponding loads specified in the AASHTO design and evaluation specifications are statistically significant load combinations that a bridge is expected to experience in its design life. More details and quantitative combinations of the loads are given in Chapter 3. 2 Strength Limit State This limit state is relevant to those loads that occur rarely or relatively infrequently, such as those induced by earthquakes, significant floods, collision of trucks, vessels, or ice flows.

Nevertheless, β is still a function of the resistance and load factors φ R , γ D, and γ L , as conceptually shown in Eq. 4-18. Of course, the function relation is more complex than that in Eq. 4-18 and cannot be expressed in a closed-form formula. Nevertheless, the calibration concept remains the same. On the other hand, there are three factors to be determined using one equation, Eq. 4-18. Therefore, mathematically, there can be many combinations of the three factors. Additional considerations or conditions were used in determining these factors.

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