Bridge and Highway Structure Rehabilitation and Repair by Mohiuddin Khan
By Mohiuddin Khan
State of the art Bridge and road Rehabilitation and service tools This authoritative quantity deals updated assistance at the most recent layout thoughts, fix equipment, really expert software program, fabrics, and complicated upkeep techniques for bridges and street buildings. targeting either conventional and nontraditional layout concerns, Bridge and road constitution Rehabilitation and service clarifies the newest AASHTO bridge layout codes and discusses new analytical and layout methodologies, corresponding to the applying of load and resistance issue layout (LRFD). A wealth of concise motives, solved examples, and in-depth case reviews are incorporated during this accomplished source. insurance contains: Diagnostic layout and selective reconstruction Bridge failure reports and safeguard engineering Analytical method of fracture and failure Load and resistance issue ranking (LRFR) and remodel program of LRFD and LRFR tools Inspection and structural future health tracking Bridge widening and alternative ideas traditional fix equipment complicated fix equipment Concrete fix equipment severe occasions of flood scour and countermeasures layout directions for seismic layout and retrofit equipment
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These circumstances require more intensive inspection, but at a lower cost. With the recent increase in available monitoring and computing technology, it is feasible to develop and deploy intelligent bridge monitoring systems. 4. Implementation of effective monitoring systems results in reduction of man-hours and development of optimum inspection and repair schedules. Effective monitoring systems can: • Assess long-term performance and increase system reliability • Improve the credibility of inspections and subsequent ratings through less subjective data • Improve uniformity of data, enabling the development of better decision-making tools • Improve and augment visual assessment, and provide early detection and warning.
Have survived for over 150 years with proper maintenance. New design techniques assume a shorter life of a bridge or just the superstructure of 75 to 80 years. With changes in demographics and urban congestion, intersections may need to be re-planned or widened. Planning considerations and design philosophy about performance of construction materials and joints, etc. have changed since the time when older bridges were designed. Some bridges may become functionally obsolete sooner and extreme events, accidents, or fatigue may increase the life cycle costs and cause them to be replaced even before the stipulated 75 years.
7. The seventh step is selecting methods of repair, retroﬁt, rehabilitation, or replacement. 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.