Applied Mechanics and Materials Vols. 638-640

Abstract: The organosilicon hydrophobic impregnants is applied on concrete to prevent rebar corrosion with its water repellent property which can prevent the intrusion of chloride and other harmful media. On-site the parameters of organosilicon hydrophobic impregnants of controlling quality consist of resistance to chloride penetration, water absorption of concrete and impregnating depth of organosilicon hydrophobic impregnants. The status of test methods of these parameters is summarized and their advantages and disadvantages are briefly reviewed. Finally some ideas are presented about shortcomings of test methods.

Abstract: In order to explore the influence rule of the dosage of fly ash on the strength and restrictive expansion rate of the shrinkage-compensating concrete, the shrinkage compensating concrete which was mixed with different dosages of fly ash was compared with the normal concrete, then the tests show that the optimal dosage of fly ash is 30% which is aimed to maximize the expansion and contraction rate of shrinkage-compensating concrete .Besides , the basic laws between the dosage of fly ash and the strength ,the restrictive expansion rate of shrinkage compensating concrete are summarized, and some theoretical analyses are given in the end.

Abstract: In this paper we study the asymptotic behavior of the global solutions to the initial-boundary value problem of the nonlinear wave equation with damping term by applying a difference inequality.

Abstract: The paper describes usage of moder computing complex ANSYS in calculating constructions made of physically nonlinear materials.

Abstract: In this paper, we consider the existence of global solution to the initial-boundary value problem for some hyperbolic equation with P-Laplace operator and a nonlinear dissipative term using the compactness criteria and the monotone mapping’s method.

Abstract: The high precision numerical method for solving nonlinear bending problems of large deflection beam is presented. The governing equation of large deflection beam is a strongly nonlinear ordinary differential equation. Using the solution of linear bending beam as an initial guess function, the nonlinear bending equation of beam can be transferred into a linear differential equation. The improvement solution of nonlinear bending beam is obtained by solving the linearized bending equation using barycentric interpolation collocation method. Then, the solution of nonlinear bending beam can be given by iterative method. Some examples demonstrate the validity and computational accuracy of proposed method.

Abstract: Abridging the chasm between the prevalently employed continuum methods (e.g. FEM) and discontinuum methods (e.g. DDA),the numerical manifold (NNM),which utilizes two covers, namely the mathematical cover and physical cover, has evinced various advantages in solving solid mechanical issues. The forth-order partial elliptic differential equation governing Kirchhoff plate bending makes it arduous to establish the -regular Lagrangian partition of unity ,nevertheless, this study renders a modified conforming ACM manifold element, irrespective of accreting its cover degrees, to resolve the fourth-order problems. In tandem with the forming of the finite element cover system that erected on rectangular meshes, a succession of numerical manifold formulas are derived on grounds of the minimum potential energy principle and the displacement boundary conditions are executed by penalty function methods. The numerical example elucidates that, compared with the orthodox ACM element, the proposed methods bespeak the accuracy and precipitating convergence of the NMM.

Abstract: This document explores the possibility of the discrete element method (DEM) being applied in nonlinear dynamic analysis of space frame structures. The method models the analyzed object to be composed by finite particles and the Newton’s second law is applied to describe each particle’s motion. The parallel-bond model is adopted during the calculation of internal force and moment arising from the deformation. The procedure of analysis is vastly simple, accurate and versatile. Numerical examples are given to demonstrate the accuracy and applicability of this method in handling the large deflection and dynamic behaviour of space frame structures. Besides, the method does not need to form stiffness matrix or iterations, so it is more advantageous than traditional nonlinear finite element method.

Abstract: A differentiation matrix method based on barycentric Lagrange interpolation for numerical analysis of bending problem for elliptical plate is presented. Embedded the elliptical domain into a rectangular, the barycentric Lagrange interpolation in tensor form is used to approximate unknown function. The governing equation of bending plate is discretized by the differentiation matrix derived from barycentric Lagrange interpolation to form a system of algebraic equations. The boundary conditions on curved boundary are directly discretized using barycentric Lagrange interpolation. Combining discrete algebraic equations of governing equation and boundary conditions to form an over-constraints system of equations, the numerical solutions on rectangular can be obtained by solving it. Then, the numerical solutions on elliptical domain are obtained by interpolating the data on rectangular. Numerical results of elliptical plate with uniform load illustrate the effectiveness and accuracy of the proposed method.

Abstract: An improved nonlocal peridynamic model was proposed to analyze the progressive failure and crack propagation in concrete structures. Integration-typed equations of motion rather than partial differential equations are utilized so that the cracks will propagate naturally as a consequence of simulation. The anisotropy of concrete and the short-range repulsion between material points were incorporated into the pericynamic constitutive model for concrete, and the damage of material was defined locally at the level of pairwise bond. Its validity was established through qualitative and quantitative comparisons against finite element analysis and experimental observations.