Abstract

Info

Title:: Calculation Method for Unstressed Length of Stay Cables in Long-span Cable-stayed Bridges

Author(s):: TIAN Jun; WANG Wen-wei; SONG Yi-fan; School of Transportation, Southeast University

Keywords:: long-span cable-stayed bridge; stay cable; unstressed length of cable; calculation method; construction control

Abstract:: The sensitivity parameters of various factors that influenced unstressed length of stay cables in different construction stages were analyzed and the most important influence factors were confirmed. Considering various influence factors, the calculation method for unstressed length of stay cable was given. The results show that the pre-deviation and dynamic displacement of main towers, pre-camber, prearranged height and dynamic displacement of main girders, temperature difference, elastic modulus error of stay cables, the load values which are used to calculate modified elastic elongation of stay cables are all the most sensitive factors. The proposed method can accurately calculate the unstressed length of stay cables, and avoid the situation that the length of long cables cannot be adjusted.