Comparison of European and American approaches for consideration of P-Delta effects in seismic design

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

R. Peres (Author) FEUP; J. M. Castro (Author) FEUP

Conference proceedings International

Title: 14th European Conference on Earthquake Engineering

14th European Conference on Earthquake Engineering

Ohrid, Macedonia, 30 de Agosto a 3 de Setembro de 2010

Indexing

ISI Proceedings

Scopus

Scientific classification

FOS: Engineering and technology > Civil engineering

CORDIS: Technological sciences > Engineering > Civil engineering > Structural engineering

Other information

Abstract (EN): Second order (P-Δ) effects can be a governing criterion in the seismic design of structures. For flexible structures, such as steel moment-resisting frames (MRF), these effects can lead to member oversizing, particularly when Eurocode 8 is used. This is due to the fact that in the European seismic code, the control of P-Δ effects is carried out based on the evaluation of a stability coefficient () that is dependent of the behaviour factor considered in the design process. The situation in the NEHRP provisions is substantially different as the stability coefficient is independent of the force reduction factor. A parametric study involving several steel moment-resisting frames designed for different levels of the stability coefficient as defined in the European and American seismic provisions. The results of the study clearly show that second order effects and frame susceptibility to dynamic instability cannot be realistically captured by a code-specified stability coefficient.

Language: English

Type (Professor's evaluation): Scientific