Papers by Keyword: Structural Mechanics

Abstract: In order to solve the stability and reasonable design technology of arched tunnel in tunnel engineering.Based on the general characteristics of the arch tunnel,build a three-hinged arch structure model with non-uniform loads.Through mechanical analysis,obtained the calculation formula of supporting and internal forces of flat and inclined arch with non-uniform loads,and as a basis to calculate their reasonable arch axis equation by MATLAB software.By describing a instance of tunnel engineering,proved the usefulness and accuracy of this method.It provides a reliable calculation method for stability control and design of arched tunnel in tunnel engineering.

Abstract: Education of exact and technical subjects at traditional schools of architecture faces a difficult task to bring these disciplines to students of significantly lower technical perception, now. For this reason, at the Faculty of Architecture, Czech Technical University in Prague, a series of seminars containing the design of physical and virtual models completed by measuring and static calculations to supplement existing education of statics and applied structural mechanics is currently prepared.

Abstract: This article presents the accuracy of foundation calculation of slab-use SCAD model using finite rigidity linkages. Two design schemes contain foundation on pile is considered in plane elastic problem. The analysis of obtained stress values in the foundation allows to make a conclusion on the calculation accuracy in pile models using finite rigidity linkages and the feasibility of such a simplification of the calculation of pile foundations.

Abstract: The article is devoted to the problem of numerical simulation of unbounded domains in structural mechanics. Nowadays there are many numerical methods to analyze structural mechanics problems in infinite domains. A brief analytical review of existing numerical methods is presented. Among them are finite difference method, boundary element method (BEM), finite element method (FEM) and scaled boundary finite element method (SBFEM). No one suggests general approach for all kinds of problem statements. Vast majority of industrial software realize FEM. Considering this fact it is more reasonable to modify FEM for mechanical problems in unbounded domains. New variational differential method and new FEM modification, based on the approach of quasi-uniform grids modelling in finite difference method, are proposed. New numerical methods enable to solve problems in semi-infinite and infinite domains without introduction of artificial boundaries and setting special non-reflecting conditions. The article shows basic steps of new numerical algorithms for problems in one-dimensional semi-infinite computational domain.

Abstract: The quadrilateral finite element for analysis of thin-walled reinforced concrete structures with complex geometrical shapes is suggested for implementation in engineering software. The behavior of concrete and reinforcement is described with relations of the deformation theory of plasticity, formulated in terms of residual strains, which allows passing from unloading to active loading for stress – strain diagram with opposite sign. The compatibility of deformations of concrete and reinforcement is assumed. Reinforcement of each direction is presented as a separate layer, subjected to tension - compression in the direction of rod axes. The Mindlin-Reissner shell theory as well as the mixed interpolation of shear strain components is used.

Abstract: In order to calculate the shallow foundation for moreappropriate, the paperbuildinga simplemodel in line with the actual situation of reinforced shallow foundation andcalculates, thereby improves the existing analysis method. By analyzing themodel of shallow foundation reinforced by supplementary pile, the paper getsthe method for the new model, and combined with the specificexample. Then we compare theresult between the simple model calculation and theanalysis of finite element software Midas/GTS. The analysis of specific exampleshows that, the calculation results of this new simple model and finite elementsoftware are in substantial agreement, and satisfied the safety requirement,and achieves the ideal target.It has a certain practical and reference value,because itcan be quickly and conveniently to calculate the bridge shallow foundation.

Abstract: Seismic rock study aims to clarify the relationship between the rock and the intrinsic nature of seismic attributes contained in the fluid between the paper based on the physical characteristics of the rock, viscoelasticity and anisotropy of systems theory and media rock mechanics model response characteristics, and model simulation, simulation results show that the physical structure of the rocks we build the model can well reflect the characteristics of the seismic response of rock mechanics.

Abstract: Based on molecular mechanics and the stick-spiral model, this paper first presents the analytical analysis of the effective in-plane mechanical properties of both zigzag and armchair monolayer graphene sheets. We find that the equivalent in-plane elastic constants of monolayer graphene sheets are the same in the two principal directions of graphene. The effective in-plane mechanical properties of graphene are then evaluated numerically using an improved molecular structural mechanics (MSM) model, in which the flexible connections are used to characterize the bond angle variations of graphene. Furthermore, the effective bending rigidity of the beam representing a C-C bond in this improved MSM model is determined from the energy equivalence over the basic cell of graphene and the force constants given by molecular mechanics. A rigidly connected frame model with the bending stiffness of the equivalent beams for C-C bonds different from the existing structural mechanics model is also used to evaluate the mechanical properties of graphene. The flexibly connected frame model gives very good results of Youngs modulus and Poisson ratio of monolayer graphene sheet. The new rigidly connected frame model presented here also gives improved results than the existing rigidly connected frame model of graphene.

Abstract: This paper finds that the elevated building normally located in Chongqings mountainous areas can be optimized in both integral structure and individual elements. Through the calculation of typical structure, the weaknesses of elevated building are the unevenness of the internal force caused by external loads and the over-length of supporting bars. Meanwhile, through the way of numerical modeling which uses the features of two-dimensional member bar system, specific solutions are pointed out. The conclusion can be drawn through the analysis of results and data that the more direct the method of transferring force is, the more stable the structure is. In addition, within the experience of practical engineering programs, strengths and weaknesses are also put forward through comparing measures within themselves, which can enhance the ability to resist the impulsive or extreme external force.

Abstract: The stacking robot is the main equipment in the automated high-rise warehouse.It plays an important role in the automated high-rise warehouse. Column is a major component of the stacking robot. Its performance has a direct impact on the overall performance of the stacking robot. In this paper, combining with the actual work situation of the stacking robot, we use finite element software Ansys Workbench to analyze the column of the small dual fork stacking robot in structural mechanics.Based on the analysis,we can find its weakness and improve.It provide a theoretical basis for the actual manufacturing of small dual fork stacking robot. At the same time, it also provides an effective design and analysis methods for the manufacture of the other parts of the small dual fork stacking robot.