Study On Stress Strain Observation Data And Software Development

The dam is classified into earth and rock-fill dam, concrete gravity dam, concrete arch dam, and so on. Due to the difference of monitoring projects and monitoring purposes, the kind of the collected data is distinguishing for each kind of the dam. As a result, the models used to analysis the data are different. Up to now, though enumerate many analytical methods on the observation data can be enumerated, the software specialized in some kind of the dam can not still be found. So, in this paper, after summarizing the existing methods, especially on the concrete dams, a set of software specialized in observation data of the concrete dams is produced.The stress strain observation is an important method used to study the working order and evaluate the safe condition of the engineering. As the existence of the free volume deformation and the time deformation, the actual concrete stress can not be got from elastic stress-strain model directly. We must study that the free volume deformation and the time deformation influence on the stress. So the following are what we have done.1 The Concrete D eformation and Stress AnalysisThe total strain of some point in concrete includes two parts:one part is called the stress strain produced by external loads and internal sanction; the other is called the non-stress strain produced by the free volume deformation. We can get the stress strain through subtracting the non-stress strain from the total strain.The free volume deformation includes three parts, such as self-grown volume deformation, temperature deformation and humidity deformation. The free volume deformation can be measure by non-stress gage.2 S tress S tain O bservation and E rror R eductionThe observation data includes the fluctuate produced by external factor inevitably besides measurement error and system error. The latter is usually greater than the former, and is difficult to predict and control. If the fluctuate is used to analysis, the true changing law can not be got. Before they are used, they must be reduced. In this paper, statistical verification method and 5 points strain balanceable method are used to reduce the error.3 S tudy on C alculation method of Actual StressThe purpose of the stress stain observation is to study the stress distribution of the dam. After error reduction, the strain observational data can be used to get the uniaxial strain which we can get the actual stress through with the help of some methods, such as deformation method and relaxation coefficient method in this paper.