Study On Contact Stress Distribution Model Of Thin Plate Based On Thin Film Pressure Test

When the transmission towers,communication towers are built in the rivers and lakes next to the relatively soft soil,the flexible base plate is a soft foundation on the basis of one of the basic forms.Based on the assumption that the contact stress is linearly assumed,the relevant basic design specification gives the internal force calculation method when the base sheet height ratio is less than or equal to 2.5.When the aspect ratio exceeds 2.5,the calculation of the internal force of the sheet is not given in the specification.In order to improve the design of the basic thin plate,the contact stress distribution of the thin plate substrate is measured based on the thin film pressure distribution measurement system.In this paper,different aspect ratio and material properties of the thin plate is to be studied.In this paper,based on the classical theory,basic assumptions of the sheet and the principle of the model,according to the stress balance equation of the sheet,geometrical characteristics,numerical integration of thin plates under different load forms and Least squares fitting and other methods,an exponential function distribution model with undetermined aspect ratio and material coefficient under different load forms is established.Based on the thin film pressure distribution measurement system,this paper studies the nonlinear distribution of the contact stress of thin plate.The test selected the glass sheet of different aspect ratio,material properties of the larger wood particle board and marble board.The film pressure sensor is placed between the sheet and the substrate,which can be regarded as the characteristics which does not change the contact environment and has no effect on the actual contact stress distribution.In the case of different graded loads,nearly two thousand pressure sensing units on the sensor can reflect the stress value of each sensing element and obtain the real contact stress distribution cloud map of the substrate.In the stable test conditions,the experiment in this paper can obtain the precise contact stress value at the center and corner of the thin plate,which can help determine the aspect ratio and material coefficient associated with aspect ratio and modulus of elasticity.In this paper,the contact stress exponential distribution model with the aspect ratio and the material coefficient under different load forms is obtained.The test results of the aspect ratio and the material properties are compared with the stress values under different models and analyzed for their errors.The correctness of the exponential function distribution model is verified,and a more accurate nonlinear external force condition is proposed for the internal force calculation of the foundation plate,and the strength and stiffness of the foundation sheet are improved.