Error-Control Of Whole-Procedure Construction Control In Spuer Long-Span Hybrid Girder Cable-Stayed Bridge

It is well known that configuration and internal force upon completion of the bridge of long-span cable-stayed bridge will be affected depending on the construction monitoring and control. Especially in the control of the cable-stayed bridge with span length of 1000-m scale, the limitation of traditional construction control methods becomes more obviously. Thus a whole-procedure adaptive construction control system based on geometry control method, comes into being. According to this concept, this thesis focuses on the error-control of whole-procedure construction control in super long-span hybrid girder cable-stayed bridge. Taking Edong Changjiang River Bridge for background, the main works and some conclusions are as follows:(1) Error sources and effects from fabrication to in-site control of super long-span hybrid girder cable-stayed bridge are analyzed explicitly.(2) Taking Edong Changjiang River Bridge for background, parameters sensitivity is studied based on geometry control method to find out the sensitivity distinction between steel girder cable-stayed bridge and hybrid girder cable-stayed bridge. In order to solve this problem, responses of configuration and internal force caused by environmental parameters and structural parameters during both construction process and completion of the bridge are studied to confirm the sensitivity of responses to parameters, which can lay a solid foundation for the study of mechanical character on long-span hybrid girder cable-stayed bridge. According to the result of the study, it is shown that structural behavior in mid-span and side-span is independence with each other. As side-span of concrete is characterized by its heavy self weight and rigidity which can enhance anchoring effect, internal force is much more sensitive to variation of parameters, whereas configuration of mid-span is much more sensitive instead. From the distinguish between mid-span and side-span, including some special mechanical personality of concrete, control strategy in mid-span and side-span are different from the features of steel girder cable-stayed bridge, that internal force should be paid much more attention in side-span, and configuration in mid-span will be controlled primary. In this thesis, mechanical behavior of hybrid girder cable-stayed bridge have been subjected to intensive studies, which can lay a solid foundation for error-analysis and parameter identification in later work and provide references for construction control in other bridges of similar type.(3) Construction methods are studied on the unstressed length of cables and unstressed geometry of different part during the construction of Edong bridge. These unstressed constants will be modified in an appropriate way when errors occur, to keep the configuration and internal force upon completion of the bridge remain the same. As for steel girder, the unstressed geometry will be modified during fabrication process, that can be controlled effectively with higher precision.(4) Errors caused by controllable parameters can be identified in mechanical and physical methods, which will eliminate the effect of these parameters that can convert multi-parameter identification to one- parameter identification. Based on this concept, the steel segment self weight identification becomes much more easier and more applicable.