Concept of Risk-Based Seismic Design of Buildings Using Methods of Nonlinear Analysis

Abstract eng:
Development of nonlinear methods of analysis and powerful software for simulation of seismic response of structures offered a possibility to overcome shortcomings of the standards for earthquake-resistant design of structures. Firstly, these shortcomings are briefly addressed, followed by an overview of the nonlinear methods for seismic performance assessment of buildings. An emphasis is given on the envelope-based pushover analysis procedure, which was recently developed, and assumes that the seismic demand for each response parameter is controlled by a predominant system failure mode that may vary according to the ground motion and intensity level. The second part of the paper deals with the concept of risk-based design procedure, which is an iterative process based on different methods for seismic performance assessment of buildings. The proposed design procedure involves definition of the initial structure, which is then assessed in order to check whether the seismic risk is below the acceptable/tolerable level. However, since several or many iterations will be needed in order to fulfill the criteria of acceptable/tolerable risk it is foreseen that this step of the risk-based design procedure will be based on approximate procedures for seismic performance assessment. The next step of the proposed design procedure will utilize the nonlinear response history analysis, which would be performed for few ground motions from a set of hazard-consistent ground motions. The risk-based design will be possible only by further development of comprehensive software for computational simulation. The paper is concluded with presenting pros and cons of the proposed design procedure. It is foreseen that, the risk-based seismic design of structures will represent a major step towards scientifically oriented design procedures employing high level of technology. 1

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