Architecture
B. Hassani; A. Ganjali; M. Emdadi
Abstract
: Numerical methods, especially the Finite Element method, are increasingly being used for solving different problems. Due to fact that these methods are approximate, having a good understanding and judgment about the errors and their distribution is very important. Hence education of users of engineering ...
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: Numerical methods, especially the Finite Element method, are increasingly being used for solving different problems. Due to fact that these methods are approximate, having a good understanding and judgment about the errors and their distribution is very important. Hence education of users of engineering analysis and design software is necessary and inattention to it may result in catastrophe. As regards this issue, the problem of determining the stress intensity factor in a cracked plate under tensile stresses, by using the finite element method together with error estimation and adaptivity, is the subject of this article. For this purpose, an academic FORTRAN code has been developed which is able to estimate the finite element solution error by using the superconvergent patch stress recovery method. In addition, an adaptive solution with remeshings in each step is carried out to improve the quality of the employed finite element mesh. Comparing the obtained results with the analytical solution, as well as the ANSYS commercial software, it is observed that the employed algorithm for error estimation has a better performance and can be used for determination of the stress intensity factor in complex structures with arbitrary cracks.
Architecture
B. Hassani; A. Jafari
Abstract
Panel construction has played an important role in building construction in recent decades. These buildings are different from the conventional frame structures because of lack of usual beam and column elements. It seems that structural engineers have reservations in using these construction systems, ...
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Panel construction has played an important role in building construction in recent decades. These buildings are different from the conventional frame structures because of lack of usual beam and column elements. It seems that structural engineers have reservations in using these construction systems, due to some ambiguities in the seismic behavior and specially in choosing the proper value for the seismic response modification factor. Study of this factor in panel buildings dealt with in this paper by investigation on three different panel structures with similar plan layouts and different heights. PERFORM-3D software is employed to model the nonlinear behavior of these structures with the capability of finite element analysis by making use of the multilayer fiber section shell elements. Doing so, the response modification factors are calculated and discussed. According to the drawn conclusions, it seems that there exist a considerable difference between the obtained results and the values suggested by the related standards, which implies a need for revision due to apparently excess conservatism.
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