tailieunhanh - A method for technical diagnosis of construction

In the present article the author advances a diagnosis method of structures ditl'erent from the above, we expect that the advanced method could avoid some difficult inherent with the solution of inverse problem. | Vietnam JourniLl of Mechanics, NCST of Vietnam Vol. U, 1999, No 1 (25- 35) A METHOD FOR TECHNICAL DIAGNOSIS OF CONSTRUCTION NGUYEN VAN PHO Hanoi University of Civil Engineering §1. Introduction Nowadays the design of a new construction is no more a hard problem, but it is not the same to the technical diagnosis problem of constructions. The methods, largely used now for the diagnosis problem of construction 1enerally include the following steps: ~ To carry out inspection from the real construction for gathering the needed data by investigations, measurements, experiments, etc. -To model the real construction {scheme of the calculation). - To set up the system of equations for diagnosis. - To solve above the system of equations. ~To evaluate and conclusion. The essence of the above procedure is to solve an inverse (or partly inverse) problem of mechanics [1, 2, 3], therefore the following difficulties often rise:\ -The system of equations is non-linear or transcendent. ~ system of equations of diagnosis has more than one solution (the number eX solutions is finite). - The solutions of system may be unstable due to errors of experimental data. - The system has no solution or an infinity of solutions. Bence up to now there is no yet any program to auspiciously solve the diagnosis problem in the computer, like SAP90 program does for solving the problem \o design a new construction. In the present article the author advances a diagnosis method of structures ditl'erent from the above, we expect that the advanced method could avoid some clit6cukies inherent with the solution of inverse problem. The matter of our method is to solve a sequence of design problems, and to aaJae a comparison between the obtained results so as to deduce the corresponding problem. The similar idea is~used in (4, 5]. 25 For illustration, diagnostic problems of circular and rectangular plates are considered. §2. The contents of the method . The method includes following .

• Kiến trúc - Xây dựng
• Vietnam Journal of Mechanics
• A method for technical diagnosis of construction
• Technical diagnosis of construction
• The technical diagnosis problem
• Diagnosis method of structures
• Dang Dinh Ang
• Nonlinear analysis and mechanics
• Dynamic problems involving stationary cracks
• The Wiener Hopt technique
• Dual integral equations
• Dual integrals in non linear fracture mechanics
• Non linear fracture mechanics
• Energy release rate
• Discuss the obtained
• The alpha finite element method (αFEM)
• Solid mechanics using triangular and tetrahedral elements
• Suitable computational cost
• NS FEM makes
• The upper bound property
• Non linear constitutive problems in solid mechanics
• Non linear constitutive problems
• Languages Gibian and special operators
• The application FEM
• Betts miller janjic convective parameterization scheme
• H14 31 model to forecast heavy rainfall in Vietnam
• Betts Miller Janjic
• Three rain seasons
• Manufacturing dry mixed cement mortar
• High compressive strength
• High flexural strength
• Low shrinkage and high watertightness for restoration
• Damaged hydraulic structures in Vietnam
• Standard gradient models and crack simulation
• Standard gradient models
• The propagation of cracks
• Damage mechanics and crack simulation
• The interaction between two parametric excitations
• The second and third degrees
• The asymptotic method of nonlinear mechanics
• Dynamic system governed
• Comparison of two hydrological model simulations
• Nam and Xinanjiang for Nong Son catchment
• The Central Vietnam
• The runoff components
• 3 D numerical simulation
• The tidal circulation
• The gulf of Tonkin
• The kinetic energy distribution
• Duality in the analysis of responses to nonlinear systems
• The analysis of responses
• The original nonlinear systems
• The study of nonlinear mechanics
• Aerodynamics of a wing in surface effect ship
• Theory and experiment
• Wing in surface effect ship
• The aerodynamic characteristics
• The Institute of Mechanics
• The error estimate
• The convergence rate for h
• p refinement
• The finite element analysis
• Three dimensional elastostatic mechanics problems
• Some initial experimental results
• Free water layer formation in horizontal pipes
• Water layer formation
• Hanoi Institute of Mechanics
• Bending vibration of beam elements under moving loads
• Considering vehicle braking forces
• Fluctuations of structures
• Beam elements according
• Continuous element for vibration analysis
• Thick shells of revolution
• Continous Element Method
• Finite element solutions
• Natural frequencies and harmonic responses
• Cast3m implementation of the extended finite element method
• The extended finite element method for cohesive crack
• Quasi brittle materia
• The proposed implementation
• The displacement discontinuities
• Buckling analysis of simply supported composite laminates subjected
• In plane compression load
• A novel mesh ffree method
• Alternative numerical technique
• Mesh free method
• A three story building
• Hedge algebras based fuzzy controller
• The structural system
• The El Centro earthquake
• Three story building against earthquake
• Laminar separation phenomenon combining with numerical calculations
• The turbulent separation
• The laminar separation
• Experimental study on mechanical properties
• Three phase polymer composite reinforced
• Glass fibers and titanium oxide particles
• Polymer composite reinforced
• Three phase composite
• Dynamic characteristics of elastically supported beam subjected
• A compressive axial force and a moving load
• The implicit Newmark method
• The Galerkin finite element method
• The axial force
• Eccentrically stiffened functionally graded plates and shallow shells
• Von Karman Donnell sense
• The formulation of governing equations
• The classical shell theory
• Mathematical modelling and control of the evolution
• Dynamic systems interacting with medium
• Mathematical modeling evolutional systems interacting
• Two conjugate mechanical subsystems
• Evaluating structural safety based on fuzzy set theory
• Evaluating structural safety
• The fuzzy reliability
• Simple beam structure