Trends in the Seismic Design Provisions of U. S. Building Codes

摘要

Seismic design provisions in building codes of the United States have undergone profound and far - Reaching changes in recent years. This paper Provides an overview of the major trends that have Characterized those changes. Trends in the broad Areas of seismic input, site classification and site Coefficients, triggers for seismic detailing Requirements, and performance basis of seismic Design are examined. Lmplications for precast Concrete are briefly discussed and future trends are Briefly commented upon.