The Analysis Of Non-linear Effects On Low Tower Cable Stayed Bridge During Construction

As a new form of cable stayed bridge which is usually used in recent years, a lot of questions are supported by low tower cable stayed bridge during its construction for its longer span and increasingly duration with a more complicated conformation. Most obviously, how to control the accuracy of construction becomes a key point. Viewed from improving the accuracy of construction technology, some effects of creep effects and geometric nonlinearity are analysized by this thesis for low tower cable stayed bridge with cantilever technology, factors that affect the accuracy of construction technology are discussed.The main works of this thesis are followed:(1)The background of low tower cable stayed bridge is introduced, the research condition for its components and mechanism performances are stated, the current situations for construction technology are summarized;(2) Some key point for construction technology of low tower cable stayed bridge are elaborated, including formulations for cable tensions, effects of material nonlinearity and geometric nonlinearity during construction and how to establish construction monitor system;(3)Effects of nonlinearity for a low tower cable stayed bridge with cantilever technology are calculated via MIDAS/CIVIL, variation tendencies of deformation and stress are compared;(4)Combining construction monitor for a real bridge and considering the effects of material nonlinearity and geometric nonlinearity simultaneously via MIDAS/CIVIL, the rationality of the model are testified and the degree of double nonlinearity effects for the accuracy of construction technology are researched.