Dimitrios G. Lignos
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View article: CHARACTERIZATION OF COLD-FORMED STEEL FRAMED / WOOD-SHEATHED FLOOR AND ROOF DIAPHRAGM STRUCTURES
CHARACTERIZATION OF COLD-FORMED STEEL FRAMED / WOOD-SHEATHED FLOOR AND ROOF DIAPHRAGM STRUCTURES Open
The seismic in-plane response of cold-formed steel (CFS) framed diaphragm structures has not been the subject of extensive study. The information available specific to diaphragm design in the North American CFS design standard is based on …
View article: EXPERIMENTAL STUDY OF SLIDING FRICTION DAMPER FOR HIGH-PERFORMANCE STEEL STRUCTURES
EXPERIMENTAL STUDY OF SLIDING FRICTION DAMPER FOR HIGH-PERFORMANCE STEEL STRUCTURES Open
Passive energy dissipation devices are widely utilized in buildings to minimize structural and non-structural damage under seismic loading. Commonly used devices include, among others, yield, viscous and friction dampers. While the use of …
View article: A Force‐Based Beam‐Column Element With Selective Gradient‐Inelasticity for Softening Materials in 3‐Dimensional Nonlinear Analysis
A Force‐Based Beam‐Column Element With Selective Gradient‐Inelasticity for Softening Materials in 3‐Dimensional Nonlinear Analysis Open
Fiber‐based beam‐column elements featuring an effective material constitutive law with softening can capture the degrading response of structural members under extreme loading. However, these elements exhibit strain localization and mesh d…
View article: STEEL-3dPointClouds: dataset supporting quantification of residual life and reusability of steel beam-columns
STEEL-3dPointClouds: dataset supporting quantification of residual life and reusability of steel beam-columns Open
This paper presents STEEL-3dPointClouds, a dataset of deformed steel beam-columns obtained using high-fidelity physics-based numerical simulations. These simulations trace the inelastic deformations of hot-rolled wide-flange steel beam-col…
View article: Shake table tests on nonlinear steel fuses for the acceleration-control of nonstructural components
Shake table tests on nonlinear steel fuses for the acceleration-control of nonstructural components Open
During recent major earthquakes, modern seismically designed buildings have demonstrated a low risk of collapse and life-safety limit states. However, both direct and indirect economic losses are often primarily due to damage to nonstructu…
View article: Use of interactive tools in seismic engineering and structural stability to facilitate learning and foster engagement: Application to high-school outreach and university courses
Use of interactive tools in seismic engineering and structural stability to facilitate learning and foster engagement: Application to high-school outreach and university courses Open
The theories of structural stability and dynamics of structures in a sense provide the backbone of structural engineering education and underpin advanced design approaches. Some of the challenges students face in these classes stem from th…
View article: Full‐Scale Tests to Characterize the Effect of Framing Action and Slab Continuity on the Collapse Capacity of Composite Frames Under Cyclic Loading
Full‐Scale Tests to Characterize the Effect of Framing Action and Slab Continuity on the Collapse Capacity of Composite Frames Under Cyclic Loading Open
This paper presents an experimental study that examined the role of the slab continuity and framing action on the overall hysteretic behavior of a composite‐steel moment resisting frame (MRF) up until incipient collapse using advanced inst…
View article: A Multiaxial Plasticity Model with Softening for Simulating Inelastic Local Buckling in Steel Beam Columns under Monotonic Loading through Fiber Elements
A Multiaxial Plasticity Model with Softening for Simulating Inelastic Local Buckling in Steel Beam Columns under Monotonic Loading through Fiber Elements Open
This paper proposes a novel multiaxial plasticity model for 3-dimensional nonlinear static analysis of steel frame buildings with fiber-based beam-column elements. The proposed constitutive formulation is expressed within the framework of …
View article: Uniaxial material model with softening for simulating the cyclic behavior of steel tubes in concrete‐filled steel tube beam‐columns
Uniaxial material model with softening for simulating the cyclic behavior of steel tubes in concrete‐filled steel tube beam‐columns Open
This paper presents a new uniaxial constitutive material formulation with softening for simulating the inelastic behavior of steel rectangular tubes in concrete‐filled steel tube (CFST) members. The primary behavioral characteristics of th…
View article: Sharing data and code facilitates reproducible and impactful research
Sharing data and code facilitates reproducible and impactful research Open
Modern research often involves the collection or analysis of data and the use of specialized computer algorithms. Traditional text articles thus provide only partial documentation of a research study. Readers have limited ability to reprod…
View article: Full-Scale Experiments of Cyclically Loaded Welded Moment Connections with Highly Dissipative Panel Zones and Simplified Weld Details
Full-Scale Experiments of Cyclically Loaded Welded Moment Connections with Highly Dissipative Panel Zones and Simplified Weld Details Open
This paper presents the experimental results of two welded unreinforced flange-welded web (WUF-W) beam-to-column connections that defy the current design paradigm of prequalified welded connections. The proposed WUF-W connections feature c…
View article: Experimental study of the cyclic behavior of steel tube in concrete‐filled steel tube members
Experimental study of the cyclic behavior of steel tube in concrete‐filled steel tube members Open
A concrete‐filled steel tube (CFST) specimen was tested under uniaxial loading to acquire the nonlinear monotonic and cyclic response of the steel tube in CFST members including inelastic cyclic local buckling. The failure mode, hysteretic…
View article: Geometric tolerances of welded connections with inelastic panel zones
Geometric tolerances of welded connections with inelastic panel zones Open
Prequalified beam‐to‐column connections in steel moment resisting frames usually concentrate inelastic deformations in the steel beam ends. As such, nonlinear geometric instabilities (i.e., local buckling) may occur in these regions at mod…
View article: Proposed residual stress model for hot‐rolled wide flange steel cross sections
Proposed residual stress model for hot‐rolled wide flange steel cross sections Open
Residual stresses in hot‐rolled wide flange steel cross sections may lead to premature yielding, accelerated corrosion and brittle fracture of steel members. The above phenomena lead to a loss of a steel member's stiffness and resistance u…
View article: Effect of heat treatment on microstructure and pseudoelasticity of a memory‐steel
Effect of heat treatment on microstructure and pseudoelasticity of a memory‐steel Open
The pseudoelasticity behavior of memory‐steels has recently gained attention for applications in seismic‐resistant structures. The pseudoelasticity can be used to reduce residual deformations in building structures subjected to seismic loa…
View article: Hysteretic behaviour of welded connections with highly inelastic panel zones
Hysteretic behaviour of welded connections with highly inelastic panel zones Open
The current practice in capacity‐designed steel moment resisting frames (MRFs) worldwide allows for limited shear yielding in the column web panel zone. As such, inelastic deformations concentrate near the beam ends, thereby leading to fle…
View article: Digital‐Image‐Correlation for Simulating Cyclic Local Buckling in Steel Beams
Digital‐Image‐Correlation for Simulating Cyclic Local Buckling in Steel Beams Open
Nonlinear continuum finite element (CFE) analyses rely on accurate multiaxial constitutive law formulations along with reliable imperfection patterns for simulating nonlinear geometric instabilities in steel members under mechanical loadin…
View article: Experiments and proposed model for residual stresses in hot-rolled wide flange shapes
Experiments and proposed model for residual stresses in hot-rolled wide flange shapes Open
This paper proposes a new residual stress model for hot-rolled wide flange steel cross sections. For this purpose, a dataset of 85 residual stress measurements is first assembled. The dataset is comprised of prior measurements available in…
View article: Backbone curve variations on steel building seismic response
Backbone curve variations on steel building seismic response Open
A 4-story steel moment-frame building designed according to ASCE 7 was used in a numerical parameter study to assess the effects of modeling features on peak drift demands. Features studied included strength, stiffness, ductility, and degr…
View article: Proposed Stiffener Spacing Requirements for the Seismic Design of Short Links in Eccentrically Braced Steel Frames
Proposed Stiffener Spacing Requirements for the Seismic Design of Short Links in Eccentrically Braced Steel Frames Open
Links in eccentrically braced frames (EBFs) are designed with transverse web stiffeners to achieve the desired seismic performance targets established in current design standards. Prior studies have suggested that stiffener spacing require…
View article: Influence of gravity connections and damper activation forces on the seismic behavior of steel CBF buildings with dissipative floor connectors
Influence of gravity connections and damper activation forces on the seismic behavior of steel CBF buildings with dissipative floor connectors Open
This paper investigates the influence of typical gravity connections on the seismic demands of steel concentrically braced frame (CBF) buildings with friction dampers as dissipative floor connectors. The investigated connections include (i…
View article: The automated collapse data constructor technique and the data‐driven methodology for seismic collapse risk assessment
The automated collapse data constructor technique and the data‐driven methodology for seismic collapse risk assessment Open
Majority of the past research on application of machine learning (ML) in earthquake engineering focused on contrasting the predictive performance of different ML algorithms. In contrast, the emphasis of this paper is on the use of data to …