Papers by Keyword: Thick Plates

Abstract: In this paper we propose a new refined shear deformation plate theory. This theory possesses a series of desirable features, the most salient of which areas follows: (i) The loads, which are usually considered to be applied on the middle surface of the plate, are applied in this new theory on the top surface of the plate; (ii) The equations deduced provide the same order of accuracy as several theories with second order shear deformation effects; (iii) It constitutes a theory, in the sense defined by Love, since it gives easy expressions for application to problems in different fields in architecture and engineering.

Abstract: The numerical simulation method was adopted to study the multi-pass controlled rolling deformation process of the 400mm thick slab and the changing rule of the internal strain field. It was tried to simulate the center strain changes of the thick slab by two deformation processes which were the first rolling deformation process under a uniformed temperature and the second rolling deformation process after the waiting. It was shown that in the rolling process of super-thick steel plate both the first rolling process and the second rolling process could control the deformation of the central region. When the macro pressure rate was the same, the thinner was the slab, the greater pressure rate in the central region. The amount of deformation of both the first process and the second one was the same as 20%. The maximum strain was located in nearly one-tenth thickness of the surface layer and the minimum was in the center.

Abstract: In this paper, we report on an analytical solution for beam-type skewed highway bridges subjected to truck loading. To confirm the analysis derivation and the solution obtained, the moment and shear responses to the design truck load are acquired using the analytical method for a number of typical US highway bridges and compared with those from numerical finite element method (FEM) analysis. In addition, the lateral distribution factors for moment and shear used in routine design are investigated based on comparison of the analytical approach and FEM. The analytical solution is shown in good agreement with the FEM result. Furthermore, the relevant provisions in the American Association of State Highway Transportation Officials' (AASHTO's) LRFD Bridge Design Specifications are also discussed here for comparison. It is observed that the design code specified load distribution factor may not predict well, especially for shear and/or severe skew.

Abstract: The cut, a main preparing means of specimen, will cause a difference in stress distribution between thick plate and the specimen, so this article focuses on the topic of evaluating impact of the cut on stress measurement results. Firstly, the real surface stress distribution of the plate and specimen were determined by X-ray diffraction (XRD) and FEM. Secondly, according to the specimen dimension and machining procedure, the influence of the cut on internal stress measurement is obtained and compared with the FEM results. The conclusions are as follows: (1) the normal stress of cut plane steeply decreases and the stress gradient descends along with distance away from the cut. The range of distance is approximately one-thickness of specimen. (2) In order to obtain stable and reliable results, the plane size of specimen is taken three times larger than the thickness. (3) The milling processing of layer removal method (LRM) can change the surface stress state of specimen, but the machining effects on residual stresses can be removed by properly choosing milling parameters.