Goings, Craig B.

Parametric Study of Steel Moment Frames Considering Foundation Rocking

Abstract eng:
Allowing critical lateral force resisting components in a building structure, such as shear walls or frames, to rock and recenter under ground motion excitation have been proven through numerous experimental and analytical studies to improve the building’s overall seismic performance. This is achieved due to the protection of critical components and the enhanced energy dissipation characteristics developed through rocking, which can help reduce the building’s peak drifts, residual drifts, and peak floor accelerations, if properly designed. Additionally, the rocking behavior can reduce construction costs when compared to conventional designs incorporating deep foundation systems due to simplified construction details and smaller foundation sizes in the rocking system. This paper presents a parametric study of several conventionally-designed steel moment frame buildings analyzed considering rocking foundations. Steel Special Moment Resisting Frames consisting of 1, 2, and 3 bays in buildings of 3, 6, and 9 stories were designed per ASCE/SEI 7 for three levels of seismicity corresponding to three major cities in California. The resulting 27 building configurations were analyzed using 2dimensional frame models in SAP2000. A suite of 7 ground motion records with representative seismic characteristics for the three building sites was used to carry out nonlinear response history analysis of the frames. Peak roof displacements, peak roof accelerations, and base shear demands, among other response parameters, were compared for all building configurations. The study assesses the effects of key design parameters that can influence the performance of rocking systems, including the building height, lateral stiffness, and ground motion intensity. Important structural analysis results are presented in detail, showing how each variable affects the seismic behavior of the rocking system.

Contributors:

Mohr, Benjamin A.

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.