Analysis, Design & Performance

Single Abstract

340740 - Performance-Based Design of Modular Building Systems Using Seismic Isolation

Friday, April 20
3:30 PM - 5:00 PM
Location: 204AB

The design of building structural systems in the United States is moving toward a risk-informed, performance-based approach. Using such a design approach, a target acceptable mean annual frequency of unacceptable performance (MAFUP) may be established depending on the post-earthquake functionality requirements of the facility, the value of building contents, or the owners’ individual risk preferences. This design approach is particularly suitable for a new class of buildings utilizing modular construction techniques. Modular construction has chiefly been pursued for reduction in schedule, labor savings, cost savings, and improved site safety; however, an opportunity exists to reliably embed consistent seismic performance into the modular design approach through the use of seismic isolation. The goal of this paper is to introduce a practical strategy for the design of modular buildings whose standardized structural and nonstructural components have already been certified to a particular level of seismic demand. Such a design may be considered a template of a single, standardized modular building to be deployed in multiple geographic regions, all having varying levels of seismic hazard, fault mechanisms, soil types, etc. In addition, the proposed approach could be used where multiple buildings are to be designed based on a single modular layout with varying heights and plan dimensions. Whereas a conventionally-designed building would be expected to have varying seismic reliability for each seismic hazard environment in which it is built, the introduction of a properly tuned seismic isolation layer can modify the seismic effects such that the target performance objectives are met regardless of the original modular component design basis and building geometry. This paper presents a practical method to target bilinear viscous isolation system properties (strength, stiffness, and damping) given a standard modular building design and a set of seismic hazard curves for a specific site and soil type. This method has the potential to simplify the design of new modular buildings located worldwide, while providing a consistent level of reliability against unacceptable seismic performance.

Troy Morgan

Exponent

n/a

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Ezra Jampole

Associate
Exponent

Dr. Jampole is an associate at Exponent. He specializes in seismic isolation, earthquake engineering, performance-based design, nonlinear structural analysis, and structural dynamics. He has experience designing steel, concrete, and wood framed buildings. His background in evaluating building damage includes laboratory testing and field investigations following adjacent construction, settlement, hurricanes, and earthquakes.

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