Wind Resistance Performance of Long-span Suspension Bridges with CFRP Cables

A research was made of the wind resistance performance of 2 000～5 000 m long suspension bridges with carbon fiber reinforced polymer(CFRP) cables based on non-linear aerostatic and aerodynamic finite element method.The comparison study shows that the critical aerostatic velocity will decrease but the critical flutter velocity will increase after using CFRP cables,which is caused by the combined effects of cable weight and torsional frequency.In order to improve wind resistance performance,a study was made of a serial of schemes and their effectiveness.The results show that increasing rise-span-ratio is effective;auxiliary cables can be used within 3 000 m or narrower span;for 4 000 m span,central slotted gir der with guard fences can be applied;if the main span is longer than 5 000 m,narrowly slotted or widely slotted section is recommded.