Songya Lake Analysis, Self-anchored Suspension Bridge Linear Calculation And Construction Control

In recent years,conceret self-anchored suspension bridges have rapidly developed.Due to slowly development,the research of design theory and construction control methods is not as comprehensive'as traditional suspension bridges.Supported by the project of Songya lake conceret self-anchored suspension bridge which arrangement of bridge is 15+50+132+50+50 meters,the thesis has mainly studied the final bridge cable lineshape and construsction control. Combined analytical method with nonlinear finite element method,the author focuses to discuss initial lineshape of construsction control and hanger tension schemes.The main contents are as follows.l.By adopting segmental catenary theory, process has been programmed to calculate lineshape and internal force of the completed bridge and unstressed length of main cable and hanging cable.The calculation has completely anastomosed with the design lineshape. According to internal force of main cable on completed bridge state, it has sloved the circle center position of cable saddle, also established modified formula of cable unstressed length on cable saddle.The practical cutting length of main cable has been figured out.2.In accordance with the characteristics of self-anchorde suspention bridges,the background project applies full scaffold construction method. In order to get initial lineshape of main cable and primary beam about construction control,the paper firstly programmes process to calculate lineshape of free cables and obtain the formula;secondly basing on the principle that unstressed cable length is invariable,it confirms the position of lifting-point;at last,it builts the plane finite element model of whole brigde based on analytical solution of free cable lineshape.Through analysis modification and calculation,it draws the initial lingshape that could forward erect the complete bridge state.3.Applied diferent sequence and method of hanger tension,the paper drafts 4 schemes.In comparision the result of these schemes with the target values,it tests the validity of these schemes.Considering some controlling fectors such as tention batches,tensioning force,lengthening rod numbers and offset on the steel conduit etc.,two economical and reasonable schemes has been singled out.Furthermore,it compares saddle incremental launching times,hanger tension frequency,main girder stess and demoulding opportunity, recommends a reliable scheme at last.