EXTERNAL POST-TENSIONING OF EXISTING STEEL BRIDGES

摘要

Many bridges have been found to be under-strength because of increased loads, widening of the bridgedeck, or change of the type of traffic. In many cases bridges that rate low are strengthened with conventionalmethods. The use of external post-tensioning to strengthen steel bridges has been used in many countries since the1960’s. Their relative ease of installation, effectiveness for structural strength and economical advantages has beenwidely recognized. This technique is growing in popularity because of the speed of construction and the minimaldisruption to traffic flow. This paper will provide information on how this technique can be applied.