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Al-Tabtabai H, Alex A P, James R

Slab formwork design using genetic algorithm

Abstract: A method to design cost-optimum slab formwork components is proposed in this paper. Genetic Algorithms (GAs), a technique based on the principles of natural selection and evolution, is applied to solve the optimisation problem. GAs search from a population of possible solutions limited by a set of constraints. The cost of form components and labor involved, were considered for the formulation of the objective function of the optimisation problem. The bending moment, shear, maximum deflection, imposed ACI code provisions, etc., were used as constraints for the optimisation problem. Application of GA to the formwork design problem provides optimum design parameters such as the optimum cross section for form members, optimum spacing of form members, etc., while minimising the total cost. Formwork made either from wood, wood-metal composite or metal alone can be designed using the proposed technique. The paper presents the case of general formwork design, however, the method as a whole readily applies to the design of formwok for elevated slabs and high rise concrete elements.



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Series: w78:1999 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.economic (0.011489) class.analysis (0.007703) class.retrieve (0.007266)
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Permission to reproduce these papers has been graciously provided by the Research Press of the National Research Council of Canada. The support of the editors, particularly Dr. Dana Vanier, is gratefully appreciated.

Brnic J, Canadija M

Prediction of metal creep behaviour used in building energetic systems using finite element method

Abstract: A large number of engineering systems operate under multiaxial stress conditions and at the same time under special environment conditions. Because of the fact that optimal procedure design, based on the design specifications will dictate the design life under such mentioned conditions, it is of transcending importance to make an analysis of the time-dependent effects such as creep and relaxation. The paper deals with the numerical modelling of creep behaviour of the building energetic structure members which operate under special environment conditions. Mechanical sublayer method using finite element procedure is used. Using viscoplastic models two applications are presented.



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Series: ecce:1997 (browse)
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