Environment

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 ranking (LRFR) are layout and assessment equipment that experience changed or provided possible choices to different conventional tools because the new criteria for designing and load-rating U.S. road bridges. Bridge layout and evaluate covers entire bridge platforms (substructure and superstructure) in a single succinct, viable package deal. It provides real-world bridge examples demonstrating either their layout and review utilizing LRFD and LRFR. Designed for a three- to 4-credit undergraduate or graduate-level path, it provides the basics of the subject with out increasing needlessly into complex or really expert topics.

Important positive factors include:

Exclusive specialise in LRFD and LRFR
Hundreds of images and figures of genuine bridges to attach the theoretical with the practical
Design and assessment 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 direction on the undergraduate or graduate level
The merely bridge engineering textbook to hide the $64000 themes of bridge evaluate and rating
Bridge layout and assessment 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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Extra resources for Bridge Design and Evaluation: LRFD and LRFR

Example text

The live load was described using truck weight data from weigh stations. The analysis covered single-lane, two-lane, and multilane bridges of simple and continuous beams. The span length was from 10 to 200 ft. The analysis covered the component’s bending and shear limit states, but not deflection, cracking, and so on. 2. Establishment of Reliability Model for Selected Bridge Types and Components The model used in this calibration is given in Eq. 4-4, which is a linear function of the variables R and Q .

Coast Guard and/or other agencies having jurisdiction. S. Coast Guard. The horizontal clearance may affect the selection of span length and/or span type. The vertical clearance can control the bridge superstructure height. Since the superstructure section height related to the maximum stress in the section is a function of the material strength of the cross section, this may dictate selection of the superstructure material. When the bridge being designed needs to intersect with another highway, the vertical clearance of the bridge shall be in conformance with the AASHTO (2011b) publication A Policy on Geometric Design of Highways and Streets for the functional classification of the highway unless exceptions thereto can be accordingly justified.

Deflections due to weights of different components should be reported separately. For example, deflections due to steel beams should be included in plans separately from those due to the concrete deck slab. Deflections due to future wearing surfaces or other loads not applied at the time of initial construction are also required to be reported separately. Structures such as bridges should be designed to avoid undesirable structural or psychological effects due to live load deformations. In the past, live-load deflection was required to be controlled at specified levels with reference to span length L .

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