A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Feasibility Study of Steel Grid Decks for Bridge Floors
Redecking of bridges with open or filled grids is being considered as one of the common rehabilitation techniques due to many practical advantages. The present phase of this research has critically reviewed the present AASHTO design philosophies and other criteria for transverse load distribution and stiffness, and developed simple load distribution formulae. The proposed formulae are validated by comparing these results with the ones from the finite element method, the sandwich core analysis, and the experimental investigations. Special emphasis is given to stress improvement factors, rating improvements, and rehabilitation costs of bridges utilizing open or filled grid decks in place of concrete decks. This report suumarizes the manufacturing and erection practices and highlights the maintenance problems of grid decks. This is accomplished by soliciting responses to the questionnaire, which was sent to the maintenance engineers of several highway agencies, contractors, consultants and manufacturers. Causes of failures of primary and secondary bars of maintenance problems of filled grid decks are established and the corrective measures are suggested. In addition, certain design procedures for establishing the size and spacing of welds between stringers and grid decks are suggested. Certain recommendations are made to maximize the grid span between stringers, and limit the permissible differential stringer elevations, with the idea of minimizing the current maintenance problems.
Feasibility Study of Steel Grid Decks for Bridge Floors
Redecking of bridges with open or filled grids is being considered as one of the common rehabilitation techniques due to many practical advantages. The present phase of this research has critically reviewed the present AASHTO design philosophies and other criteria for transverse load distribution and stiffness, and developed simple load distribution formulae. The proposed formulae are validated by comparing these results with the ones from the finite element method, the sandwich core analysis, and the experimental investigations. Special emphasis is given to stress improvement factors, rating improvements, and rehabilitation costs of bridges utilizing open or filled grid decks in place of concrete decks. This report suumarizes the manufacturing and erection practices and highlights the maintenance problems of grid decks. This is accomplished by soliciting responses to the questionnaire, which was sent to the maintenance engineers of several highway agencies, contractors, consultants and manufacturers. Causes of failures of primary and secondary bars of maintenance problems of filled grid decks are established and the corrective measures are suggested. In addition, certain design procedures for establishing the size and spacing of welds between stringers and grid decks are suggested. Certain recommendations are made to maximize the grid span between stringers, and limit the permissible differential stringer elevations, with the idea of minimizing the current maintenance problems.
Feasibility Study of Steel Grid Decks for Bridge Floors
1980
138 pages
Report
No indication
English
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