Improving Infrastructure Sustainability 2: Repairing Existing Fatigue Cracks in Steel Bridges Using Carbon Fiber Reinforced Polymer Materials, Technical Summary.

摘要

This report describes the results of an experimental program to evaluate the use of composite materials to prevent and repair distortion-induced fatigue damage in web-gap regions of steel girders. In this method of repair, a composite block is cast in place in the area surrounding the cross frame-to-girder connection to provide an alternate load path and reduce the stress demands in the welds of the connection. Two full-depth bridge girders were subjected to dynamic loading under a constant force range and allowed to develop fatigue cracks. The girders were subsequently repaired using composite blocks and subjected to several million fatigue cycles.