Hysteresis Model for Fiber Elements in Effective Damaged Zone of Square-Section Steel Piers Considering Local Instability Effect of Steel Plates
Publication: Journal of Structural Engineering
Volume 146, Issue 8
Abstract
The local instability of steel plates is the predominant seismic failure mode for steel bridge piers. However, the application of shell-based finite-element (FE) models in an engineering design presents significant difficulties, and existing simplified calculation methods have their own insufficiency. In this paper, single-column square-section steel bridge piers were studied to propose an equivalent hysteretic model for the fiber elements of steel piers that can consider the local instability behavior of steel plates. Using the length of the half-buckling wave at the bottom of pier as the length of effective damaged zone (), average stress–strain curves of the cross-section points over the were extracted from the calculation results of a fiber-shell hybrid model. The two-surface constitutive model of material was modified by introducing the equivalent elastic modulus and skeleton curve and reducing the bounding surface radius to make the hysteresis and average stress–strain curves coincide. An equivalent hysteresis model for the fiber elements in the effective damaged zone was proposed, and the process for identifying model parameters was introduced. Using Q345qC structural steel as an example, regression formulae for equivalent hysteresis model parameters were established. Based on the comparison with calculation results of a hybrid element model, the improved fiber model can accurately calculate the seismic response of a structure under horizontal unidirectional or bidirectional earthquakes and significantly save calculation cost. The proposed equivalent hysteresis model can provide a method for calculating the elastoplastic seismic response with a high accuracy and good availability for the seismic design of steel piers under horizontal bidirectional earthquake actions.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The study described in this paper was supported by the Natural Science Foundation of China (51878606). The support extended is gratefully acknowledged by the authors. Further, the authors would like to express their gratitude to Dassault Systèmes Simulia Corporation for allowing the use of their powerful commercial FE package—ABAQUS 6.14—during this research.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 8 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 28, 2019
Accepted: Feb 6, 2020
Published online: May 27, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 27, 2020
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