The Research On Construction Simulation & Construction Monitoring Of Luosiling Liu-River Major Bridge

At present, pre-stressed concrete continuous rigid-frame bridges are widely adopted inlong-span bridge for their good mechanical behavior and good load-bearing ability,construction rapidness and convenience. Cast-in -place cantilever method is mainly used toconstruct long-span pre-stressed concrete continuous rigid-frame bridges. Once a segment ofthe main beam has been erected, the linear of the segment can not be change in theconstruction stages behind. To make sure the closing-join precision and the linear, also theinternal forces, of the bridges is meeting the need of design and keeping the ideal alignmentand internal forces when the construction completed (after shrinkage and creep finishes), it isnecessary to execute construction control effectively during construction of bridge.Based on the construction control and monitoring project of Luosiling Liu-River majorbridge, the principles, methods and contents of construction control are discussed in this paper.More attention is paid to the study of the structure parametric sensitivity for the main beamand the ways to simulate the construction process. The key technology and the main influentfactors of construction control are listed. Reasonable advice for design, construction andmonitoring of the same kind of bridge is put forward after the practical construction control ofLuosiling Liu-River bridge has been introduced.The thesis consists of seven chapters. In the first chapter, the characteristics, the status quoof adoption at domestic and abroad, for pre-stressed concrete continuous rigid-frame bridge,are listed. The importance of bridge construction control and the study level of the subject athome and overseas are expatiated. The aim and the research significance of the paper areintroduced in the end.In Chapter Two, the basic kNowledge of bridge construction control which is necessary toexecute construction control successfully, such as the tasks of construction control, themainly methods, how the system is made up of, the main influent factors, the main ways toforecast the structure states, apparatus and equipment in common use etc, are listed.The construction project of Luosiling Liu-River major bridge is introduced in the thirdchapter, including the design standard, the design parameters, the main material, theconstruction scheme of the main bridge. Chapter Four to Six are the kern parts of the thesis. To have a definite object in view andget twice the result with half the effort in the construction control of bridge, the main influentfactors of construction control must be searched out, and the subordination factors must beeliminated. So in Chapter Four, sensitivity of the design parameters for Luosiling Liu-Rivermajor bridge is analyzed. The influences of parameter error to the deflection and stress ofbridges structure are studied by changing the main parameter. Then the methods of parametersidentification mainly used today are analyzed and compared with each other, and thelimitations of these methods are pointed out. Advice is presented, which is adopting measuredparameters to modify calculated parameters directly during construction control. In ChapterFive, a bridge structure analysis software, GQJS, is used to create a finite element model tosimulate Luosiling Liu-River major bridge actual construction process by means ofprogressive calculation. Construction control documents, used as basic datum duringconstruction control, come into being after the stress and deformation of every constructionstage attained by calculating from the model. The construction control and monitoringpractice of Luosiling Liu-River major bridge is introduced in Chapter Six. An emphasis is puton the comparison between the measured value and the theoretic value of the stresses anddeflections for each construction stage of the main beam. Researches have been done to findout the main causes that bring the margin between the measured value and the theoretic value.The reasonability of the inspection and its data analysis handling and correctness ofconstruction control have been proved by the closure smoothly of the bridge.In the seventh chapter of the thesis, the successful experience and cognition of theconstruction control for Luosiling Liu-River major bridge are summarized. Some suggestionsfor the design, construction, monitoring of the same kind of bridge in the future is put forward.Finally, the deficiencies in the thesis and the direction of further study in the future arepointed out.