Requirements Of City Road Landscape Of Special Structureto Adapt To The Construction Safety Key Technology Research

Extradosed cable-stayed bridge isa new kind of bridge the characteristics of witch are between normal cable-stayed bridge and continuous beam bridge. It is widely used both aborad and domestically because of its beautiful appearance and good mechanical performance with outstanding economy. Construction control for extradosed cable-stayed bridge is a significant factor which can influence on the structural safty during construction and it is also an important way to gurantee the normal use, durability and safety during operating period. Cast-in-place cantilever method witch demonds high construction preciseness is normally used to building this bridge. Therefore, Study on construction control of extradosed cable-stayed bridgehas guiding significance for its construction.This thesis approaches a newly built extradosed cable-stayed bridge (named Yongxin Bridge)in Laibin as a project beckground. The extradosed cable-stayed bridge construction control and related issure was discussed in it. The following parts are the main contents of this thesis:①The definition and characteristic of extradosed cable-stayed bridge are introduced. The difference and connection between extradosed extradosed cable-stayed bridge and other similar structure such as traditional cable-stayed bridge and continuous beam (rigid frame) bridge is discussed from several aspects such as span distribution, mechanical performance and economic span. The development of extradosed cable-stayed bridge and its construction control theory are summarized.②The basic principle and specific contents of extradosed cable-stayed bridgeconstruction control are introduced. The theories of construction control are studied and the method witch is used in Yongxin bridge is determined.The influence factors of construction control are summarized. Meanwhile, the corresponding measures and matters needed attentionduring construction control are put forward.③Thewhole Yongxin bridge model for construction control analysis is set up by using FEM software. The model analyse the actual construction stages by using forward-analysis method and the cable force, inner force&displacement value of every stage are obtained.The parameter identification method is used during the construction to make the model more close to the real situation. A solid model of15#cross-beam is also set up by using ANSYS to analyse the transversal stress in different construction stage. The comparison between FEM results and measurement results shows the source of errors.④The contents and methods of construction monitoring were studied. The error analysis is conduct by comparison construction monitoring data and FEM data. Then the experience of construction control is summarized⑤The main work in this thesisis summarized, and plan of the further researches conceived finally.The research is expected to further promote the development of extradosed cable-stayed bridge and to provide experienceofextradosed cable-stayed bridge construction in the future.