Contents:
Nikos D.
Lagaros , Lemonis D. Psarras , Manolis Papadrakakis , Giannis Panagiotou. Abstract The objective of this work is to perform optimum design of 3D steel structures having perforated I-section beams. The optimization problem is formulated as a combined sizing, shape and topology optimization problem. The cross-sectional dimensions of the columns and beams constitute the sizing design variables, while the number and size of the web openings of the beams constitute the topology and shape design variables, respectively.
Two distinctive formulations of the optimization problem are considered depending on the finite element discretization implemented for simulating the structural elements. The two formulations, corresponding to beam and shell discretization, are compared in terms of the optimum designs achieved.
A characteristic test example considered, showed that a quantifiable reduction in the weight of the structure is accomplished by allowing web openings in the beams of the structure without reducing structural strength or serviceability requirements. Authors Close. Assign yourself or invite other person as author.
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Assignment does not change access privileges to resource content. Wrong email address. Structural optimization means finding the best solution while considering several design constraints. The optimization can be topology, shape and size optimization.
Our activity is related mainly to sizing optimization. These constraints can be the behaviour of the structure, like the stresses, fatigue, deformations, stability, eigenfrequency, damping, etc. These constraints are usually highly nonlinear, so to find the optimum it is not an easy task. It is as important to have a reliable optimization technique.
Push-over analysis for performance-based seismic design. A parametric study dealing with typical office buildings braced horizontally and with regularly spaced columns is presented. Show next xx. New Password. Summarizes the Eurocode rules for design. Design Examples Two building frameworks are selected for seismic optimum design using the metaheuristic algorithm [ 15 — 17 ]. These constraints can be the behaviour of the structure, like the stresses, fatigue, deformations, stability, eigenfrequency, damping, etc.
There are many optimization algorithms available. Non of the algorithm is superior. All of them can have benefits and disadvantages. This Chapter describes the importance of cost calculations when we optimize a structure. These cost calculations are founded on material costs and those fabrication costs, which have direct effect on the sizes, dimensions or shape of the structure. The cost function includes the cost of material, assembly, welding as well as surface preparation, painting and cutting, edge grinding, forming the shell and is formulated according to the fabrication sequence.
Other costs, like amortization, investment, transportation, maintenance are not considered here. Sometimes we can predict the cost of design and inspection, but usually they are proportional to the weight of the structure.
The present study shows the difference between structures optimized for minimum volume and minimum cost. The cost function contents the cost of material, assembly, welding and painting. A simply supported welded box section beam is investigated.
The design constraints are as follows: limitation of the maximum stress from the maximum bending moment, limitation of plate slendernesses to avoid local buckling of flange and web. The minimization of the volume and cost results in different beam sizes, but the cost difference between the two optima is small. A cantilever tubular truss with parallel chords is investigated. The compression rods are designed against overall buckling so that the required cross-sectional areas are calculated with approximate closed formulae.
Articles Cited by. Structural Engineering and Mechanics 47 2 , , Structural Engineering and Mechanics 44 3 , , Iranian Journal of Science and Technology. Articles 1—10 Show more. Help Privacy Terms. Constructability optimal design of reinforced concrete retaining walls using a multi-objective genetic algorithm A Kaveh, M Kalateh-Ahani, M Fahimi-Farzam Structural Engineering and Mechanics 47 2 , , Life-cycle cost optimization of steel moment-frame structures: performance-based seismic design approach A Kaveh, M Kalateh-Ahani, M Fahimi-Farzam Earthquakes and Structures 7 3 , , Civil Eng 2, ,