Estudo de caso da não-linearidade física de alvenaria estrutural em edifícios

Abstract

Structural masonry buildings have become getting more common in Brazil, especially in buildings, of increasing heights, participating in government funding programs. Considering this context, the objective of this work is to verify whether the verification parameters for Physical Nonlinearity Stability (NLF) of ABNT NBR 16868- 1:2020 are reasonable for the calculation of bracing structures in structural masonry buildings. To achieve this goal, an experimental research will be conducted using case studies as a basis for numerical modeling. The analysis was performed using the SAP200 software and considering three methods, namely: the Balanced Wall Method (BWM), the Tridimensional Frame Method (TMP), and the Finite Element Method (FEM). These methods was used to build models based on one typical floor plans considered to have 15 floors. For each of the models a pure analysis (P) will be performed, without considering the Physical Nonlinearity, and one considering the simplified parameters (NLF-S) indicated by the Brazilian standard. In addition, for the FEM case, a third analysis considering the physical nonlinearity in an approximate way (NLF-A) was performed. It was concluded that when simplified models are used, the consideration of Physical Nonlinearity through the reduction coefficients presented in ABNT NBR 16868-1:2020 is coherent. However, when more complete and complex models are used, such as the Finite Element Method, the simplified consideration may be unfavorable to the safety of the structure.