EFFECTS OF THE INTERNAL PRESSURE AND TEMPERATURE VARIATIONS ON SEISMIC RESPONSE SPECTRA OF TUBULAR SYSTEMS / A PRESSÃO INTERNA E A VARIAÇÃO DE TEMPERATURA NOS SISTEMAS DE TUBULAÇÃO E OS ESPECTROS DE RESPOSTA DE PROJETO PARA CARGAS SÍSMICAS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The analysis of secondary structure systems to seismic loads is a special and open subject in the design of industrial installations. Two particular points attract specialist attention and effort on the way of a more realist, comprehensive and economical design: the dynamical properties interaction between the secondary and principal systems and the amount of the secondary system ductility which can or should be considered in the design. It is very clear at this stage that the designer decision has to be well advised because depending on circumstances the final results may show very surprising. The context of experiences on this subject, at PUC-Rio, includes a series of initiatives. Among them, one may to give special mention to the following: the study and proposal of a methodology to develop a coupled floor response spectrum (Valverde, 1998); the development of a simplified secondary system model: multidegree, linear-elastic, tubular elements and connexions and spring supports (Castañaga, 1998); the introduction of inelastic action in the tubular elements and supports of the simplified secondary system and the definition of a system overall ductility factor to relate, qualitative and quantitatively, the simplified secondary system coupled response spectrum under elastic and inelastic behavior (Sampaio, 2003). Now, another advancement is enhanced with this study on the influence of element static loads due to internal pressure and temperature variation on these elastic and inelastic response spectrum relationships. Comparison also is made into coupled and uncoupled secondary system elastic and inelastic response spectra. Approximated medium response spectra for the inelastic coupled response of a simplified secondary system are also proposed.

ASSUNTO(S)

response spectra variacao de temperatura temperature variation espectros de resposta pressao interna fator de dutilidade internal pressure secondary systems ductility factor comportamento inelastico inelastic behavior sistemas secundarios

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