Applied Mechanics and Materials Vols. 166-169

Abstract: The tensioned membrane structure is a typical flexible architecture and is sensitive on the wind loads . We used software ANSYS to do modal analysis of the umbrella-shaped membrane structure and analyzed the natural vibration characteristics. We focused on the effect of design parameters on structural modal. The results show that the natural frequency of umbrella-shaped membrane structure mainly depends on membrane prestress and membrane tension stiffness.

Abstract: Abstract. The paper discusses a method of optimization of thick-walled shells on the basis of the solution of inverse problems theory of elasticity of inhomogeneous bodies. There are discussed the terms of equal-stress and equal-strength structures. The notion of efficiency ratio of equal-strength shell as the ratio of limit loads in heterogeneous and homogeneous shells. Constructed the model of a multilayer shell of polymer concrete for which the coefficient of efficiency is close to 2.

Abstract: The advantages of reinforcing methods for crane girder were compared with disadvantages and it was found that external prestressing method was the most reasonable reinforcing method. Thereafter, this method was used for reinforcing crane girder. Some reinforcing points such as determining calculation view, the control stress calculation, the prestress loss calculation and the tension length calculation etc. were described in detail. Finally, maintenance of the steel components and the prestressed reinforcements should be paid attention during the use of crane girder.

Abstract: The optimization of yield shear coefficient for parallel base isolation system is investigated systematically. The maximum dissipative energy scale factor is used as the objective function, the maximum sliding displacement of a base-isolated layer, the residual displacement and the maximum base shear coefficient are considered the constraining factors. The optimal range of the yield shear coefficient is proposed by inputting the seismic waves of the different sites.

Abstract: The isolation of horizontal ground motion is usually considered in the base isolation. However, the influence of vertical ground motion is not enough considered. The rubber isolation bearings install in series disk spring. The isolation layer parameters and the corresponding mechanical model are proposed. The vertical isolation effect of the new system is remarkable by analyzing example.

Abstract: Four prism concrete specimens with same height, same width, but different lengths is simulated in using ABAQUS FEM analysis software. The simulation work is conducted under monotonic axial compression loading, and its purpose is to research the size effect of prism concrete specimens, primarily to study the effect of specimen length on the axial compressive strength. The stress-strain relation of the specimen is analyzed. The results indicate that, for different lengths of specimens, their axial compressive strengths are quite different and the size effect on them is much obvious. The compressive strength improves gradually with the increasing of length, and size effect on transverse and vertical constraint stress of core concrete area is much distinct as well. Meanwhile, it can be obtained that the standard design method of the structures and components is conservative and of adequate security.

Abstract: The paper studies the failure of the 3-D complicated configuration composite turbine blade by applying failure criterion. This failure criterion considers three kinds of different failures. They are matrix tensile/compressive failure, fiber- matrix shear failure and fiber failure. By Using FEA software ABAQUS, the stiffness degradation and failure behavior of the turbine blade of composite structure were studied. The failure and stiffness degradation of the two analysis models were conducted by typical numerical examples as well.

Abstract: This paper investigated the ultimate bearing capacity of tubular-gusset joints with 1/4 annular plate or none annular plate based on the experiment and FEM methods. We calculated various impacts of different annular plate parameters on the ultimate bearing capacity. And also, the relationship between of them was summarized.

Abstract: The elastic Euler buckling of an inextensible column is confined in a plane, and subject to fixed end displacement, in the presence of rigid, frictionless side-walls which constrain overall lateral displacements. The whole deflection is divided into some typical columns because of the symmetry. The governing equations of constrained buckling mode and deflection about axial load are deduced, based on linearized differential equation of beam. Point and line contact models are introduced to describe the behavior of the column in constrained buckling process, including load capacity, buckling wave and reaction force. The analysis on the deflection of column is helpful to the research about possible post-buckling paths.

Abstract: Removed at authors request