| According to problem of the canal irrigation area of Ningxia frost damage and the low canal water utilization in this paper, based on the research of extensive field and test, and use the finite element software of ADINA to build 3D-SOLIDE finite element model with the D60 type prefabricated concrete canal lining steel mold and carry on research simulated systematically for prefabricated concrete U-shaped canal lining steel mold deformation and displacement of stress and strain changes.In order to verify the correctness of the finite element model,testing for conventional prefabricated D60 U-shaped concrete canal lining steel mold with the dynamic strain meter in the comprehensive Agricultural development Office in Qingtongxia City,and Provide a theoretical basis for the prefabricated concrete canal lining steel mold design optimization, and have a guiding role in saving technological transformation Irrigation. The results were as follows:(1) Through the numerical simulation of U-shaped concrete steel mold different structure of canal under the condition of static load,The displacement of the steel mold on the straight linear segments was maximum, the arc segments followed and the straight line connecting segments and arc segments connecting segment were minimum. When Longitudinal stiffeners number were 2Z,3Z,4Z and 5Z, the maximum deformation of steel mold model was 0.231mm,0.043mm,0.032mm and 0.024mm, the maximum deformation of steel mold that longitudinal stiffeners were 3Z reduced 4.34 times than that the longitudinal stiffeners were 2Z, the maximum deformation of steel mold that the longitudinal stiffeners were 4Z reduced 34.38% than that the longitudinal stiffeners were 3Z, the maximum deformation of steel mold that the longitudinal stiffeners were 5Z reduced 33.33% than that the longitudinal stiffeners were 4Z; when the thickness was 5mm,8mm,10mm, and 12mm, the maximum deformation of steel molds were 0.0564mm,0.0317mm,0.0265mm and 0.0218mm, the maximum deformation of steel mold that the thickness was 8mm reduced 77.92% than that the thickness was 5mm, the maximum deformation of steel mold that the thickness was 10mm reduced 19.62% than that the thickness was 8mm, the maximum deformation of steel mold that the thickness was 12mm reduced 21.56% than that the thickness was 10mm. Through comprehensive analysis, The appropriate layout of the steel mold was that the thickness of the prefabricated concrete lining steel mold channel is 8mm and 10mm, and the number of longitudinal stiffeners were 3 and 4, and the number of transverse stiffeners were 2 (transverse stiffeners were arranged on the straight linear segment and arc segment for 1),and the best layout of steel mold is that the thickness was 8mm and the Longitudinal stiffeners number were 4Z and transverse stiffeners was 2.(2) Through the numerical simulation of U-shaped concrete steel mold different structure of canal under the condition of modal,the first master frequency of the steel model with the thichness were 8mm and 10mm and the number of longitudinal stiffener was 3 and the number of transverse stiffener was 4 was between 274.80Hz and 345.92Hz.The vibration deformation pattern of different steel model were different as the quality and stiffness were different of the steel model for different thichness and longitudinal and transverse stiffener. The first main mode of vibration was translated or bend in the plane of X-Y, and the second mode of vibration was bend in the plane of Y-Z,even appears torsional deformation and vibrating muster shape on the different floor of the steel model.(3) Through the dynamic response analysis of U-shaped concrete steel mold different structure of canal under the condition of harmonic load, the displacement deformation of steel mold structure of channel prefabricated concrete lining was sinusoidal variation when the frequency of harmonic load was constant. The master frequency of the steel model of the thickness was 8mm and the number of longitudinal stiffeners was 3 and transverse stiffeners was 2,that was they are arranged in a straight line segments and arc segments were 274.80Hz, and the master frequency of the steel model of the thickness was 8mm and the number of longitudinal stiffeners was 4 and transverse stiffeners was 2,that was they are arranged in a straight line segments and arc segments was 321.94Hz,and the master frequency of the steel model of the thickness was 10mm and the number of longitudinal stiffeners was 3 and transverse stiffeners was 2,that was they are arranged in a straight line segments and arc segments was 295.22Hz, and the master frequency of the steel model of the thickness was 10mm and the number of longitudinal stiffeners was 4 and transverse stiffeners was 2,that was they are arranged in a straight line segments and arc segments were 345.92Hz.(4) The dynamic strain test was based on the steel mold of D60 type prefabricated concrete canal lining to verify the feasibility of the numerical simulation of finite element model of the extended steel model. |
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