Methods and Techniques for Solving Problems of Compaction Monitoring of Complex Structures

• Main Authors: I. A. Meschikhin, S. S. Gavriushin, E. A. Zaitsev
• Format: Article
• Language: Russian
• Published: MGTU im. N.È. Baumana 2014-01-01
• Series: Nauka i Obrazovanie
• Subjects: monitoring the strength; matrix recovery; reduction; Superelements method; finite element method; hydroconstruction
• Online Access: http://technomag.edu.ru/jour/article/view/717

<p>Currently, organization of monitoring complex spatial structures is a particularly relevant task. A classical representative of this class of structures is hydraulic valve ones, in particular floodgates. This class of structures is of particular interest in the fact that systems for monitoring their operational state must meet rather strict requirements because of the monitoring object operation:</p><p>-structure operates at the air-water media junction;</p><p>-has long lifetime;</p><p>-has movable structural elements;</p><p>-has significantly different operating conditions within the navigation and inter-navigation period.</p><p>This paper offers to meet requirements through the remote design of deflection measurement (no sensors on the object for monitoring), and evaluate rapidly due to data processing, using reduced models and matrix recovery.</p><p>The paper presents a technique for selecting the optimum in terms of identifying the current load, the number of measurement points and their relative position. It suggests an approach that allows us to recover the active stresses by measured displacements and determine design elements, the stiffness of which is different from the project stiffness. With available model of design and active forces it is possible to determine a residual error of actual measurements and calculation results by measuring the displacement at the points the number of which exceeds the number of linearly independent loading. This residual error can be interpreted as a result of unsuspected active force or as a deviation of structure rigidity from the project one. This paper gives an upper estimate of stresses and defines possible places of stiffness degradation simultaneously using the same set data.</p><p>The presented material is based on the test cases and shows the results of choosing measurement points for the floodgate No 7 of Moscow Canal.</p>