Interação entre painéis pré-moldados de concreto e a estrutura principal por meio de modelos numéricos em elementos finitos

Abstract

Precast concrete panels reveal an important architectural and structural function for constructions, and their use has grown in Brazil. Previous studies indicate the panels contribution in reducing efforts and displacements in the main structure, resulting in more economical structures. This work analyzes the panels interaction with the main structure via numerical analysis by using the ANSYS Software, under the effect of lateral actions. Two analyses of one-floor structures are developed: one is constituted of vertical panels connected to the beam and the other one is constituted of horizontal panels connected to the columns, using SOLID65, SOLID45, SHELL63, BEAM4, BEAM44, TARGE170, and CONTA173 finite elements. Results show the importance of the contribution of panels towards the stiffness of the main structure, promoting a reduction in the structure s displacements. Such stiffness causes stresses in the panels and in the connectors, being the latter the most critical. Quite often these stresses are not considered in the structural project. In the second analysis, with the horizontal panels connected to the columns via plate connection, results show that the precast panels contribution to the stiffness of the main structure is highly significant and it is affected by the eccentricity of the connection with occurrence critical stress in the connections and increases as the plate s thickness decreases. The use of plates with greater thickness results in less stress, but they transfer lateral bending to the precast panels. The thermal effect s consideration implies in such a greater tensions in the panels how much in the connections and greater efforts of lateral bending in the panels. The panels contribution may be considered a design strategy, due to the fact that they produce an effective material economy by means of the possibility of reduction of column dimensions.