Research on a Method About Determining the Initial State of the Internal Force in Existing Cable-Stayed Bridge

摘要

Cable tension adjustments carried out on the existing cable-stayed bridge means optimal adjustments of the internal force. It differed from optimization in the design phase or the construction process, because the existing cable-stayed bridge' construction process is uncertain and it's structural parameters of materials is degenerating. In this article, it supposes that uncertain construction process, mutative structural parameters and the corresponding displacement of bridge structure caused by external loads are due to the change in cable tension. Based on the data of static testing, it certificates the corresponding relationship of changes in cable tension and displacement; submits the parameter identification method according to cable force-displacement' relationship to determine the initial state of the internal forces in existing cable-stayed bridge. This method was used in adjusting and changing cables reinforcement project of a cable-stayed bridge which has operated for many years.