Design for Lateral Loads/Systems

Single Abstract

343824 - Hyperelastic 3D Printed Structural Fuses for Improved Resilience against Extreme Events

Saturday, April 21
10:00 AM - 11:30 AM
Location: 204AB

Improving structural resilience (i.e., reducing service interruptions and improving rapidity of function restoration) following extreme events has been a recent challenge in the field of structural engineering. While large casualties have successfully been avoided through the adoption of modern building codes, the sole codified performance objective has been limited to the life safety / collapse prevention range of response. Christchurch, NZ, highlighted the insufficiency of this approach, with large sections of the city nonfunctional after a major earthquake, and with subsequent collapses induced by large aftershocks. Discussions addressing resilience are timely and important at an international level.

This presentation will focus on the potential for achieving resilience using 3D printed steel components. 3D printed steel fuses can provide a strategically defined multi-linear hyperelastic constitutive response through geometric configuration and small-scale elastic buckling. The hyperelastic component behavior permits shared participation of mechanical and inertial effects at the global structure level, while also achieving self-centering after extreme loading has concluded. Displacements can be expected to increase with the hyperelastic system (relative to a traditional hysteretic system), but softened post-buckled regimes can be selected to reduce damage to acceleration sensitive nonstructural components and structure contents. Additionally, the lack of residual drift combined with reduced nonstructural and contents damage will permit continued occupation with minimal functional disruption.

This study examines the influence of trilinear hyperelastic component behavior on economic and social seismic loss estimation using single degree of freedom (SDOF) representations of low- to mid-rise structures. Hyperelastic models are parameterized with respect to buckling force limit, ductility to a second stiffening branch, and ratio of secondary to initial stiffness. The R factor is used as a proxy to characterize the buckling force limit, maintaining a common reference to hysteretic systems. Performance is quantified with respect to direct (repair) and indirect (disruption) economic loss, as well as social disruption associated with displaced households. The study examines sensitivities of loss measures to hyperelastic characteristics with respect to nonlinear dynamic ground motion response. to a suite of s representative of southern California. The information in this presentation is expected to be of interest to practitioners and faculty members. This presentation will identify maximally beneficial combinations of hyperelastic component parameters, presenting hyperelastic system performance in context relative to performance available from an alternative hysteretic system.

Joshua Steelman

Assistant Professor
University of Nebraska-Lincoln

n/a

Presentation(s):

Send Email for Joshua Steelman

Francys Lopez

Graduate Research Assistant
University of Nebraska-Lincoln

n/a

Presentation(s):

Send Email for Francys Lopez


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343824 - Hyperelastic 3D Printed Structural Fuses for Improved Resilience against Extreme Events



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