scholarly journals Optimization of Reinforced Concrete Sections under Compression and Biaxial Bending by Using a Parallel Firefly Algorithm

2021 ◽  
Vol 11 (5) ◽  
pp. 2076
Author(s):  
Gregorio Sánchez-Olivares ◽  
Antonio Tomás

A simple formulation for the optimal design of reinforced concrete sections under compression and biaxial bending was established in a previous work by the authors. In that work, it was found that the formulation produced satisfactory results when used together with three algorithms that belong to the nature-inspired meta-heuristic algorithm group. However, despite the favorable results obtained, the necessary calculation times were extensive in all the cases. In order to solve this problem, the authors implemented a parallel calculation strategy in the algorithm that gave better results in the previous work. It was possible to verify, through two examples, that this strategy reduces calculation times as more processes are used in parallel, and that the adjustments made in the algorithm favor reaching designs close to the global optimum independently of the number of parallel processes adopted.

Author(s):  
C. C. Davidson

The Church of the Nativity in
Blenheim is in two distinct structural types. The nave, narthex and tower are
of brick veneered reinforced concrete
and steel portal frames constructed
about 1959 to replace an old timber building. Check calculations showed this to generally meet latest code requirements. The transept and chancel was, prior to the strengthening work, of unreinforced brick masonry built about 1906 - with some reinforced buttresses and reinforced concrete bands. The whole building is roofed with concrete tiles. The initial assessment of the building was made in terms of Clause 301A of the Municipal Corporation Act in 1976. This building is regarded as one of Blenheim's finest older buildings and the members of the Church did not wish to lose, or detract from, its character, either by obvious strengthening or rebuilding.


2021 ◽  
Vol 9 (4B) ◽  
Author(s):  
Mehdi Babaei ◽  
◽  
Masoud Mollayi ◽  

Genetic algorithm (GA) and differential evolution (DE) are metaheuristic algorithms that have shown a favorable performance in the optimization of complex problems. In recent years, only GA has been widely used for single-objective optimal design of reinforced concrete (RC) structures; however, it has been applied for multiobjective optimization of steel structures. In this article, the total structural cost and the roof displacement are considered as objective functions for the optimal design of the RC frames. Using the weighted sum method (WSM) approach, the two-objective optimization problem is converted to a single-objective optimization problem. The size of the beams and columns are considered as design variables, and the design requirements of the ACI-318 are employed as constraints. Five numerical models are studied to test the efficiency of the GA and DE algorithms. Pareto front curves are obtained for the building models using both algorithms. The detailed results show the accuracy and convergence speed of the algorithms.


Author(s):  
Slav D. Semeniuk ◽  
Roman V. Kumashov

Static analysis of the stress-strain state of a plate on elastic foundation is made in two ways on the example of a reinforced concrete road plate 2PP30.18-30 series B3.503.1-1 intended for temporary roads. These plates are considered as a planar structure on an elastic foundation. The plates are calculated by the method of B.N. Zhemochkin using the Ritz method to determine plate deflections in the main system using the mathematical package «MathCad». Also the plates are calculated on the PC «LIRA». There are given the results of experimental and numerical studies in this article


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