A new structural optimization method based on the harmony search algorithm

Colliding bodies optimization: A novel meta-heuristic method

Fracture simulations of concrete using lattice models : computational aspects

Methods of Feasible Directions. By G. Zoutendijk. Pp. 126. 30s. 1960. (D. van Nostrand Co. London)

Particle swarm optimizer, ant colony strategy and harmony search scheme hybridized for optimization of truss structures

In this paper, an optimum design algorithm is presented for reinforced concrete folded plate structures. The design provisions are implemented by ACI 318-11 and ACI 318.2-14, which are quite complex to apply. The design variables are divided into three classes. The first class refers to the variables involving the plates, which are the number of supports, thicknesses of the plates, configurations of longitudinal and transverse reinforcement, span length of each plate, and angle of inclination of the inclined plates. The second class consists of the variables involving the auxiliary members’ (beams and diaphragms) depth and breadth and the configurations of longitudinal and shear reinforcement. The third class of variables can be the supporting columns, which involve the dimensions of the column along each axis and the configurations of longitudinal and shear reinforcement. The objective function is considered as the total cost of the folded plate structure, which consists of the cost of concrete, reinforcement, and formwork that is required to construct the building. With such formulation, the design problem becomes a discrete nonlinear programming problem. Its solution is obtained by using three different soft computing techniques, which are artificial bee colony, differential evolution, and enhanced beetle antennae search. The enhancement suggested makes use of the population of beetles instead of one, as is the case in the standard algorithm. With this novel improvement, the beetle antennae search algorithm became very efficient. Two folded plate structures are designed by the proposed optimum design algorithm. It is observed that the differential evolution algorithm performed better than the other two metaheuristics and achieved the cheapest solution.

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Optimum Design of Reinforced Concrete Folded Plate Structures to ACI 318-11 Using Soft Computing Algorithm

https://ascelibrary.org/doi/pdf/10.1061/%28ASCE%290733-9445%282006%29132%3A7%281179%29

Discussion of “Design of Steel Frames Using Ant Colony Optimization” by Charles V. Camp, Barron J. Bichon and Scott P. Stovall

The use of cold-formed open thin-walled steel sections in the various types of engineering construction has increased with the economic necessity of providing high strength with low weight and cost. Thus open thin-walled sections are replacing massive reinforced concrete beams in many types of construction. The developed algorithm for this study obtains the optimum cross-sectional dimensions of cold-formed open thin-walled steel beams under general loading. The width, depth, and wall thickness of the thin-walled section is treated as design variables and the displacement as well as stress limitation is taken into account in the algorithm presented. Since the existence of torsional moments in thin-walled sections, warping must be considered. Vlasov theory is used to calculate the normal and shear stresses that occur due to warping. The optimum design problem obtained turn out to be mixed integer and discrete programming problem. Harmony search algorithm is used to obtain its solution. This technique is a recent numerical optimization technique which mimics the musical performance process. The recent studies with the harmony search method have shown its effectiveness and robustness in finding the optimum solution of combinatorial optimization problems. A design example is included to demonstrate the efficiency of the optimum design algorithm developed.

Optimum Design of Cold-Formed Open Thin-Walled Sections Using Harmony Search Algorithm

Eleman guruplandirmasi celik izgara sistemlerin minimum agirlik tasariminda onemli etkiye sahiptir. Mevcut calismada bu etki parcacik kume ve armoni arama isimleriyle bilinen iki farkli olasiliga dayali optimizasyon metodu yardimiyla incelenmistir. Izgara sistemin optimum tasarimi LRFD-AISC Amerikan sartnamesinde bulunan sinirlayicilarin dikkate alinmasi suretiyle gerceklestirilmistir. Her iki eksen dogrultusunda tasarlanacak olan elemanlar icin ayni sartnamede bulunan 272 adet genis baslikli celik profil kesiti kullanilmistir. Optimum tasarim algoritmasi izgara sistem elemanlari icin 272 adet celik profilin bulundugu tasarim havuzundan uygun profillerin secilmesi suretiyle, sinilayicilarin saglandigi ve agirligin minimum oldugu tasarimi belirleyecek sekilde olusturulmustur. Pacacik kume ve armoni arama yontemlerinin kullanilmasiyla elde edilen tasarim algoritmalari yardimiyla sozkonusu kesikli optimizasyon probleminin cozumu gerceklestirilmistir. Bir tasarim ornegi dikkate alinarak kiris yerlesim araliklari ile optimizasyon metodlarinin performanslarinin optimum tasarima etkisi incelenmistir.

/pdf/the-effect-of-member-grouping-on-the-optimum-design-of-57e7k2bkmd.pdf

The effect of member grouping on the optimum design of grillages via search techniques

This chapter presents the fatigue phenomenon process in structural elements and connections It includes six sections The first section summarizes fatigue process, the source of fatigue, and the modeling of fatigue in general The second section is devoted to the calculation of fatigue damages by using different methods The fracture mechanics and S–N curve approaches are especially highlighted and their formulations are presented Then, the cumulative fatigue damage is explained by using the Palmgren–Miner’s rule In the third section, to estimate the fatigue damage, cycle counting procedures are presented for random stresses with the emphasis on the rainflow cycle counting The fourth section is devoted to the parametric formulation of the probability distribution of random stress ranges The parameters in this formulation are determined from numerical experiments by using the rainflow cycle counting algorithm The fifth section presents and explains the total spectral fatigue damage for a given lifetime by using a multilinear S–N fatigue model The sixth section demonstrates the fatigue damage calculation of an example offshore structure

Mehmet Polat Saka

Papers

Optimum Design of Reinforced Concrete Folded Plate Structures to ACI 318-11 Using Soft Computing Algorithm

Discussion of “Design of Steel Frames Using Ant Colony Optimization” by Charles V. Camp, Barron J. Bichon and Scott P. Stovall

Optimum Design of Cold-Formed Open Thin-Walled Sections Using Harmony Search Algorithm

The effect of member grouping on the optimum design of grillages via search techniques

Fatigue Analysis of Offshore Structures