By Mohiuddin Khan
State of the art Bridge and street Rehabilitation and service equipment This authoritative quantity bargains up to date suggestions at the newest layout thoughts, fix tools, really expert software program, fabrics, and complex upkeep systems for bridges and road buildings. targeting either conventional and nontraditional layout matters, Bridge and road constitution Rehabilitation and service clarifies the latest AASHTO bridge layout codes and discusses new analytical and layout methodologies, akin to the applying of load and resistance issue layout (LRFD). A wealth of concise factors, solved examples, and in-depth case stories are integrated during this accomplished source. insurance contains: Diagnostic layout and selective reconstruction Bridge failure reviews and security engineering Analytical method of fracture and failure Load and resistance issue score (LRFR) and redecorate software of LRFD and LRFR equipment Inspection and structural future health tracking Bridge widening and alternative options traditional fix tools complicated fix tools Concrete fix tools severe occasions of flood scour and countermeasures layout directions for seismic layout and retrofit tools
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Extra info for Bridge and Highway Structure Rehabilitation and Repair
Hence, the life cycle costs and rehabilitation efforts are greater for the superstructure components. 2. Replacement of superstructure components is more frequent than for the substructure. This is discussed in detail in a later chapter. Replacement can apply to a component or to the entire superstructure: • Parapet replacement • Deck overlay replacement • Deck joint replacement • Deck and parapet replacement • Deck, parapet, and girder replacement • Deck drainage replacement • Bearing replacement • Entire superstructure replacement.
Hydraulic and seismic history should also be reviewed. If the existing features are non-standard, consideration should be given to improving them under rehabilitation or by replacing the bridge. If improvements cannot be made or the improvements that can be made will not be up to current standards, a non-standard feature justiﬁcation will be required. This should be taken into account when making the rehabilitation versus replacement decision. 5 Truck weight for fatigue evaluation. S. No. Deck Function Deck Type Truck Type Remarks 1A 1B 1C 2A 2B 3A 3B Pedestrian use -do-doPassenger cars only -doFull service -do- Timber Lightweight Normal concrete Lightweight Normal concrete Lightweight Normal concrete H5 H5 H5 H10 H10 HS20 HS20 Place load restrictions -do- 27 28 SECTION 1 ADMINISTRATIVE ISSUES 3.
8. The eighth step is preparing contract documents and selective reconstruction. Is there a choice between rehabilitation and replacement? With thousands of bridges to be ﬁxed, economics, inconvenience to the public during reconstruction, or sentimental/historical reasons can discourage replacement. Replacement is expensive and causes interruption in service during the construction period. Environmental concerns and permit requirements will be greater for new bridges, especially those with four or more lanes.