Abstract
Abstract This work involved the structural optimization of precast concrete rigid frames with semi-rigid beam-to-column connections. To this end, several frames were simulated numerically using the Finite Element Method. Beams and columns were modeled using bar elements and their connections were modeled using spring elements, with variable bending stiffness. The objective function was based on the search of the least stiff connection able to ensure the global stability of the building. Lastly, a connection model with optimal stiffness was adopted to design the frame. Semi-rigid beam-to-column connections with a constraint factors of 0.33 sufficed to ensure the maximum allowable horizontal displacement and bending moment of the connection, with a global stability parameter of 1.12. This confirms that even connections with low constraints generate significant gains from the structural standpoint, without affecting construction and assembly-related aspects.
Highlights
Brazil’s construction industry is notorious for its low productivity, extreme wastefulness of materials and low quality control
This work involved the structural optimization of precast concrete rigid frames with semi-rigid beam-to-column connections
The objective function was based on the search of the least stiff connection able to ensure the global stability of the building
Summary
Brazil’s construction industry is notorious for its low productivity, extreme wastefulness of materials and low quality control This scenario can be changed by using precast concrete structures (Figure 1), which render constructions more rational and economic (El Debs [1]). To disseminate this constructive system and provide resources and parameters for building designers, this paper describes a study on precast rigid frames composed of semi-rigid beam-to-column and column-to-foundation connections (see Figure 2), as specified by the Brazilian technical standard ABNT NBR 9062:2006 [2]. The objective function was based on the search of the least stiff connection able to ensure the global stability of the building
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