The Earthquake Engineering Online Archive

A unified earthquake-resistant design method for steel frames using ARMA models

Takewaki, Izuru; Conte, Joel P.; Mahin, Stephen A.; Pister, Karl S.

UCB/EERC-90/07, Earthquake Engineering Research Center, University of California, Berkeley, 1990-06, 95 pages (620.1/T24/1990)

This study develops a unified earthquake-resistant design method for multidegree-of-freedom moment-resisting steel frames, including the design earthquake, via a dynamic autoregressive moving average (ARMA) model. The features of the method may be described as follows: (1) to make it possible to incorporate inherent uncertain features of design earthquakes into the design process itself through the dynamic ARMA model, (2) to provide a simplified design formula for a preliminary design of moment-resisting steel frames based upon the concept of stiffness-oriented design, and (3) to facilitate the formulation of a new probabilistic multi-objective optimal design problem aimed at finding the design with a minimum level of designer dissatisfaction. In this optimal design problem, constraints and objectives are handled in a unified manner after a feasible design is obtained. Two examples are presented, and the convergence of response statistics is examined. Finally, the generality and practicality of the design method are assessed.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-90-07.pdf (3 MB)