NONLINEAR DYNAMIC ANALYSIS OF A SLENDER FRAME UNDER REAL AND SYNTHETIC SEISMIC EXCITATIONS CONSIDERING THE BASE WITH ELASTO-PLASTIC BEHAVIOR
Luis Fernando Paullo Muñoz1; Paulo B. Gonçalves1; Ricardo A. M. Silveira2; Andréa R. D. Silva2
1 Pontifícia Universidade Católica do Rio de Janeiro; 2 Universidade Federal de Ouro Preto
doi:10.20906/CPS/CILAMCE2015-0644
Resumo
Abstract. The seismic analysis has a great importance in the dynamic analysis of structures, since earthquakes are present around the world with various intensities and recurrences. A relevant topic is the consideration of a flexible base instead of a conventional fixed base. This consideration can modify palpably the structural response in terms of displacements and accelerations. One aspect that has a significant influence in dynamic response of structures under seismic loads is the relation between the power distribution of the seismic excitation and the frequency properties of the structure, since excitations with power concentration close to resonance regions of structures can produce large displacements, which may impair the structural integrity. In the present work, the dynamic response of a geometrically non-linear slender one-floor frame under real and synthetic seismic loads considering an elasto-plastic base is studied. The space problem is solved through the discretization of the structure using a beam-column finite element mesh, and the time domain response is obtained by direct integration of the resulting non-linear equations of motion.
Palavras-chave: Non-linear dynamic analysis; Seismic excitation; Resonance frequencies; Time domain integration; Elasto-plastic base