Abstract
The cables unstressed length is an important key parameter of design and construction control. In order to accurately calculate cables unstressed length for cable-stayed bridges, the longer principle for cables is avoided at current. The various factors were fully considered which affect cables unstressed length, and the sensitivity parameters of various factors were analyzed. The sensitivity factors were identified, and not sensitivity factors were ignored. It is sensitivity factors that towers deviation in advance, towers dynamic displacement, girders pre-camber, girders dynamic displacement, temperature difference, cables elastic modulus error, the load values with calculation of cables for elastic elongation. The accurately calculation method of cables unstressed length was proposed, which was based on sensitive factors. The method of cables unstressed length is more reasonable and accurate.
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