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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Class: class.economic (0.011489)
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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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