Trial Fabrication and Experimental Study on Longitudinal Restraint Cables Composed of CFRP Bars in Main Navigational Channel Bridge of Changtai Changjiang River Bridge
The main navigational channel bridge of Changtai Changjiang River Bridge is a steel truss girder cable-stayed bridge accommodating road and rail traffic.The bridge features its two pylons that create a main span of 1 208 m.A thermal-adaptive tower-deck restraint system that harnesses the carbon fiber reinforced polymer(CFRP)cables as longitudinal constraint is installed on the bridge,with the intent of achieving full self-adaptation to temperature.To ensure the quality of the CFRP cables,the CFRP bars were manufactured on the industrialized production line and underwent static tensile tests.Based on the trial fabrication of the CFRP bars,the finished CFRP cables were manufactured,and static tensile test was conducted.It is shown that the tensile strength of the finished CFRP cables is between 3 099 and 3 886 MPa according to the trial tensioning,with the elastic modulus between 181 and 201 GPa.When the finished CFRP cables are tensioned by a force exceeding 100％nominal fracture force,no cracking,damage and wire fracture are observed in the constituent CFRP bars.The anchor body(anchorage and cast body)were sound,with no abnormalities,and the tensile elastic modulus exceeded 160 GPa,proving that the experimental results met the requirements of the related code.
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