Name: CHAYANA MORGNER GOMES DA SILVA
Publication date: 22/08/2025
Advisor:
Name |
Role |
|---|---|
| ELCIO CASSIMIRO ALVES | Advisor |
Examining board:
| Name |
Role |
|---|---|
| ADENILCIA FERNANDA GROBERIO CALENZANI | Coorientador |
| ANDRE TENCHINI DA SILVA | Examinador Externo |
| ANTÔNIO MACÁRIO CARTAXO DE MELO | Examinador Externo |
| ELCIO CASSIMIRO ALVES | Presidente |
Summary: The objective of this study is to optimize the costs and CO emissions of composite floor systems supported by composite tubular trusses, with and without concrete filling in the upper chord, considering the effect of vibrations induced by human walking. For the optimization problem, constraints related to the ultimate and service limit states of the composite slabs after concrete curing, and of the composite trusses before and after curing, were implemented. The optimization problem considered twenty-one design variables, including: circular profiles of the lower, upper, and diagonal members of the internal, edge, and main trusses; concrete strength () of the slab; thickness of the steel deck; thickness of the concrete slab; number of truss panels; truss height; concrete strength () of the filling in the upper chord of the internal, edge, and main trusses; span between internal trusses; and additional reinforcement. The Particle Swarm Optimization (PSO) algorithm was used to search for the optimal solution. To validate the implemented computational code, comparative analyses were first carried out with problems from the literature to verify the effectiveness of the proposed formulation. Subsequently, a parametric analysis was performed by varying the live loads and spans to identify the most influential factors in the solution. Finally, the effects of considering the comfort limit state of users related to human walking, and the influence of concrete filling in the upper chords of the trusses, were analyzed in the search for the optimal floor solution. It was concluded that concrete filling in the upper chords of the trusses contributes to reducing the number of truss panels and the cross-sectional area of the profiles, resulting in lower emissions and costs compared to full web beams. The analysis of floor vibration effects directly influenced the geometry of the internal and main truss sections, due to the need to provide greater structural stiffness.
Keywords: topological optimization; composite slabs; composite trusses; particle swarm optimization; costs; CO emission.
