The Comparative Analysis Of Cable-stayed Structure With CFRP Cables And Traditional Steel Cables

Cable-stayed bridge is an important structure in the field of traffic engineeringstructure, because of its shape decency, large spanning capacity, reasonable structure andother characteristics has been widely used. With the development of long-span cable-stayedbridges, the problems of cable-stayed corrosion and vibration fatigue become prominent,carbon fiber composite materials is an effective way to solve this problem, the carbon fibermaterial used for cable-stayed, can play its lightweight, high strength advantage toovercome the high weight, corrosive and other shortcomings of traditional steelcable-stayed, and improve carrying capacity and efficiency across the bridge.This paper wascarried out basic research, and select four different architecture and span cable-stayedbridge, which were used to study the static and dynamic force characteristics of thestructure with traditional steel cables and CFRP cables, to get an intuitive performancecomparison, to facilitate the application. So this paper is mainly done work in the followingareas:First detailed description of the characteristics of CFRP materials and studied theAnchorage of CFRP cables,In the material properties, the limit span and sag effect, thecomparative analysis of the performance of CFRP cable and traditional cable. Researchresults, CFRP material is superior to traditional cable cable, and limit span large and smallsag effect equivalent elastic modulus, stress the gravity stress a small proportion of the total,have obvious advantages for long-span structures.Then analyzed using numerical analysis method the static performance of single CFRPcables and traditional cable, found in CFRP cable sag effect is small, equivalent elasticmodulus is big, the weight of a small proportion of the total stress is small, for largecollapse structures have obvious advantages. Then using the finite element softwareMIDAS analyzed the static properties of four different architecture and span cable-stayedbridge, which uses CFRP cables and traditional cable, drawn: the use of CFRP cable stayedbridge make the cable force, main beam axis force, vertical displacement than the originalterms of cable-stayed smaller. Finally, analyzes the dynamic performance of four different architecture and spancable-stayed bridge, respectively using CFRP cable and traditional cable, the study found:the use of CFRP cables in cable-stayed generally transverse bending and torsionalfrequencies higher than traditional cable-stayed bridge in the corresponding frequency, andvertical bending frequency is generally lower than the original bridge, but it can be expectedthat with the increase of the span, CFRP cable stayed bridge vertical bending frequency willbe higher than traditional cable oblique Pull the bridge, since the vibration frequency can bereduced to improve the probability of excitation loads because of low frequency vibrationscaused by cable-stayed bridge.