Evaluation of US Seismic Code Provisions for Asymmetric-Plan Systems

by Rakesh K. Goel, Dep of Civ. Engg., Berkeley, United States,
Anil K. Chopra, Dep of Civ. Engg., Berkeley, United States,

Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation


The effects of plan asymmetry on the earthquake response of code-designed, one-story systems are identified with the objective of evaluating how well these effects are represented by torsional provisions in US building codes. The earthquake-induced deformations and ductility demands on resisting elements of asymmetric-plan systems, are compared with their values if the system plan were symmetric. The presented results demonstrated that the design eccentricity in US building codes should be modified in order to achieve the desirable goal of similar ductility demands on asymmetric-plan and symmetric-plan systems. The design eccentricity should be defined differently depending on the design value of the reduction factor R.

Subject Headings: Building design | Standards and codes | Seismic design | Asymmetry | Load and resistance factor design | Earthquake resistant structures | Building codes | United States

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