جستجوی مقالات مرتبط با کلیدواژه « weight » در نشریات گروه « عمران »

Today, due to existing economic issues, optimization and maximum use of materials are highly regarded. Due to the wide range of parameters, the use of mathematical methods is not logical. For this reason, meta-heuristic methods have expanded. In the field of structures, weight optimization using various methods is of great interest. Due to the importance of truss, in this paper, the optimization of truss has been done using a hybrid algorithm of harris hawks and genetics. The harris hawks algorithm is one of the newest algorithms in the field of optimization, which is derived from the natural behavior of animals. In the harris hawks algorithm, the mutation process, which belongs to the genetic algorithm, is used. The optimization is constrained; therefore the constraints of stress and displacement have been selected. Four trusses, planer 10-bar truss, spatial 25‑ bar truss, spatial 72‑ bar space truss and planner 200 bar truss have been selected for optimization. The implementation of harris hawks algorithm has been done in MATLAB software. The results obtained from harris hawks-genetic algorithm are compared with other available sources. The study shows the acceptable performance of this hybrid algorithm for truss. The harris hawks-genetic hybrid algorithm has faster convergence speed.

One of the most important parameters in dynamic analysis and design of structures is the lateral displacements caused by loading and incitement instigations to the structure which is very important in the process of computation calculation and determination of the structure sections and dynamic parameters of the structure. In the past, in the process stage of structural analysis and determination of forces and stresses tensions and the response of the structure to existing investigations stimulus, soil and foundation and structure  systems were investigated and studied and analyzed with districted and separated forms and numerous great simplifications. These studies were modeled and analyzed by with considering consideration of placing the structure on a rigid solid foundation on a soil with sufficient resistance to resist the session’s summits and forces, which is transmitted from the structural   foundation of the structure to it. Field studies and the results and observations obtained by from visiting the damaged and damaged areas of the earthquake, showed that, even at a certain location and among similar structures for in terms of shape and geometry and dynamic characteristics, the damage caused by the earthquake can could be very different, and this can only be due to the effect attributed to the impact of structure interaction - soil and foundation and such as that. The next Subsequent studies showed that the interaction of soil and foundation and structure themselves are highly strongly influenced by many parameters such as environmental factors, mechanical properties of material and soil, and the seismic characteristics form of foundation and gender, and the depth of soil and substrate seismicity of the zoning of the site of the structure and the geotechnical characteristics of the structure specifications and the like.In this study research, it tries by investigating of the is attempted to investigate these two parameters and modeling it them in the powerful software  “Abaqus” software  and considering the sufficient taking into account the number of required models needed that in each of them, One of the parameters under investigation changes, the value of their effect on the dynamic response of the structures are should be  studied.