Banca de QUALIFICAÇÃO: LOURENÇO JERÔNIMO DE REZENDE VIEIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LOURENÇO JERÔNIMO DE REZENDE VIEIRA
DATE: 08/02/2021
TIME: 09:00
LOCAL: https://conferenciaweb.rnp.br/webconf/renata-gomes-lanna-da-silva
TITLE:

ADVANCED NUMERICAL ASSESSMENT OF PERFORMANCE OF PLANE STEEL STRUCTURES UNDER HIGH TEMPERATURES

KEY WORDS:

Advanced analysis, Thermal analysis, Thermo-structural analysis, Plastic zone method, Plane steel frame, Fire.

PAGES: 70
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Estruturas Metálicas
SUMMARY:

The analysis of the behavior of structures under high temperatures is an important part of fire protection engineering, mainly in steel structures, due to the high thermal conductivity of the material. The gradual increase in temperature causes changes in the materials mechanical properties, causing a reduction in strength and stiffness of the structural elements, which can lead to premature collapse of the structure.  Due to the need for highly specialized laboratories and high costs involved in the analysis of full-scale tests, efficient computational tools based on rigorous and consistent theoretical formulations have been developed, according to the concept of Advanced Analysis, which enables structural safety assessments of structural steel systems at room temperature and in a fire situation. Thus, this work aims to numerically evaluate the second order elastoplastic behavior of plane steel structures at elevated temperatures. For this, the PPLANLEP advanced structural analysis program will be modified to include numerical procedures for the solution of the transient thermal problem. Such a program is based on the Finite Element Method and uses the updated corotational Lagrangian description and the Plastic Zone Method to obtain the consistent tangent stiffness matrix of the frame element. The algorithm to be implemented will allow the performance of thermal analyzes to determine the temperature fields in the cross sections of the structural elements. The proposed analysis consists of three steps. The first step involves the application of loading to the structure at room temperature, determining its deformed configuration, as well as the internal forces of the structural elements. In the second stage, when the fire starts, the applied load is kept constant throughout the time cycle and, thereafter, a thermal analysis of the cross sections located at the nodal points is performed, where the thermal properties of the materials and the variation of the temperature field are determined. Finally, the parameters of stiffness and resistance of the structure as a function of temperature are updated and the mechanical analysis is again carried out, in which a new deformed configuration and internal forces in the elements are obtained. This process is repeated until the time cycle is completed. Numerical examples present in the literature will be used to validate the results obtained and prove the accuracy of the proposed analysis.

BANKING MEMBERS:
Presidente - RENATA GOMES LANNA DA SILVA
Interno - LINEKER MAX GOULART COELHO
Externo à Instituição - RODRIGO BARRETO CALDAS - UFMG