By Mohiuddin Khan
Cutting-edge Bridge and street Rehabilitation and service tools This authoritative quantity deals up to date tips at the most recent layout options, fix tools, really expert software program, fabrics, and complicated upkeep tactics for bridges and street constructions. concentrating on either conventional and nontraditional layout concerns, Bridge and road constitution Rehabilitation and service clarifies the latest AASHTO bridge layout codes and discusses new analytical and layout methodologies, equivalent to the applying of load and resistance issue layout (LRFD). A wealth of concise motives, solved examples, and in-depth case experiences are incorporated during this complete source. insurance contains: Diagnostic layout and selective reconstruction Bridge failure stories and safeguard engineering Analytical method of fracture and failure Load and resistance issue score (LRFR) and remodel software of LRFD and LRFR tools Inspection and structural well-being tracking Bridge widening and alternative innovations traditional fix tools complex fix tools Concrete fix equipment severe occasions of flood scour and countermeasures layout guidance for seismic layout and retrofit tools
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Additional info for Bridge and Highway Structure Rehabilitation and Repair
If existing horizontal or vertical clearances are not adequate, the existing bridge needs to be replaced with a new bridge that has higher clearances. As an alternate, posting for vertical over clearance or under clearance is required in keeping with agency requirements. AASHTO speciﬁcations have deﬁned minimum horizontal and vertical clearances to bridge substructure and superstructure. These may be modiﬁed by state and local codes. 2. The minimum horizontal clearance between the edge of the lane and the concrete face of the abutment or pier is applicable.
Interstate bridges, those on military routes, or those serving schools, ﬁre stations, and hospitals should have top priority. Evaluation of defects should be conﬁrmed by in-depth inspection or nondestructive testing. How to initiate repair and rehabilitation? 1. The ﬁrst step is ﬁeld inspection and structural health monitoring. 2. The second step is preparing an inspection report. 3. The third step is computing the condition rating and sufﬁciency rating, for funding approval. 4. The fourth step is analysis and load rating (both inventory and operating ratings).
The following steps are followed: 1. An inspection report is prepared describing the condition of the bridge, its past history, diagnosis of defects, methods of repair or retroﬁt, and cost estimates. 2. Structural inventory sheets and ﬁeld data are obtained from two yearly inspections by inspection teams using the PONTIS system. Remote sensors are also used. 10 Physical parameters to be considered in reconstruction. 21 22 SECTION 1 ADMINISTRATIVE ISSUES 3. Diagnosis of defects and classiﬁcation of deﬁciencies are based on procedures provided in the AASHTO Recording and Coding Guide.
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