Publications by Dimitrios Lignos

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Steel beam-columns subjected to cyclic loading (such as during earthquakes) may exhibit local buckling, which results in effective cross-sectional softening and localization of deformation. These phenomena are critical from the standpoint of performance an ...

First-story columns in steel moment resisting frames are subjected to various forms of geometric instabilities during earthquakes. These instabilities have the potential to seriously compromise structural performance, and expedite structural collapse. In t ...

Steel beams with reduced beam section (RBS) are often used as part of prequalified connections in seismic regions. However, RBS connections are not as common in Europe. Reasons relate to easiness in fabrication, which requires on-site welding, and the seis ...

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 boost the predict ...

This paper explores the use of sliding friction dampers (SFDs) as dissipative floor connectors to mitigate higher mode effects and earthquake-induced absolute acceleration demands on steel concentrically braced frame (CBF) buildings. The dampers connect ea ...

Current experimental studies on the seismic behavior of steel wide-flange columns under multi-axis cyclic loading reveal that these members, depending on their geometric characteristics, may be susceptible to axial shortening, out-of-plane deformations and ...

This paper proposes a macro-model for simulating the hysteretic behavior of composite-steel beams as part of fully restrained beam-to-column connections in composite-steel moment-resisting frames (MRFs). Comparisons with experimental data suggest that the ...

Current simplified design methods for buildings with supplemental damping devices are mainly based on single-degreefreedom (SDF) shear-models. Common errors of such methods are attributed to the linearization of nonlinear damping and stiffness, higher buil ...

The present paper investigates the behavior of iron-based shape memory alloys (Fe-SMAs) subjected to cyclic inelastic straining by means of uniaxial coupon experiments. The tests feature round bar coupons subjected to a broad range of uniaxial cyclic strai ...

Post-earthquake residual deformations often control decisions regarding potential demolition of earthquake-damaged buildings. While residual deformations are typically assumed to be lateral, the column residual axial shortening has similar implications for ...

This study presents a reliable and straightforward structural analysis method, cyclic pushover analysis (CPA), coupled with a simplified numerical simulation approach to capture global and local nonlinear seismic responses of the E-Defense 10-story test st ...

An efficient component model has been developed that captures strength and stiffness deterioration of steel hollow structural section (HSS) columns. The proposed model consists of two fiber-based segments at a member's ends along with an elastic segment in ...

This paper proposes a novel embedded column base (ECB) connection that defies the current paradigm in capacity-designed steel moment-resisting frames (MRFs) where column bases have been traditionally considered as nondissipative. In the proposed concept, a ...

The rotational flexibility of column base connections is commonly assumed to be detrimental to the seismic response of steel moment-resisting frames (MRFs) because it increases story drift demands and promotes soft-story formation by lowering the point of ...

This paper aims to comprehend the behavioral aspects of beam-to-column subassemblies with highly dissipative circular hollow section (CHS) panel zones with emphasis on those with large panel aspect ratios (i.e., greater than 1.5) via experiments and contin ...

This paper proposes an innovative design concept for embedded column base (ECB) connections featuring wide flange steel columns. The developed ECB connection achieves a non-degrading hysteretic response up to lateral drift demands associated with low proba ...

Rapid structural damage assessment methodologies for engineered facilities are essential in order to properly allocate and ensure efficient use of emergency rescue forces, minimize business interruption and perform effective repairs in damaged infrastructu ...

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 requirements in the stan ...

Nonstructural components in buildings can be subjected to very large acceleration and deformation demands during earthquakes. This is particularly true for flexible components that are tuned or nearly tuned to one of the modal frequencies of the supporting ...

The performance-based earthquake engineering framework utilizes probabilistic seismic demand models to obtain accurate estimates of building engineering demand parameters. These parameters are utilized to estimate earthquake-induced losses in terms of prob ...

Dimitrios Lignos

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Simulating Cyclic Local Buckling–Induced Softening in Steel Beam-Columns Using a Nonlocal Material Model in Displacement-Based Fiber Elements

The seismic stability and ductility of steel columns interacting with concrete footings

Full-scale testing of European steel beams with reduced beam section under reversed cyclic loading

The automated collapse data constructor technique and the data-driven methodology for seismic collapse risk assessment

Seismic design and performance of steel concentrically braced frame buildings with dissipative floor connectors

Sensitivity of Simulated Steel Column Instabilities to Plasticity Model Assumptions

Proposed nonlinear macro-model for seismic risk assessment of composite-steel moment resisting frames

A practical method for seismic retrofit of tall buildings with supplemental damping

Experimental behavior of iron-based shape memory alloys under cyclic loading histories

Effect of Column Base Flexibility on Earthquake-Induced Residual Deformations of Steel Columns

Cyclic pushover analysis for seismic response evaluation of a full-scale 10-story steel building tested on the E-Defense shake-table

Fiber-based hysteretic model for simulating strength and stiffness deterioration of steel hollow structural section columns under cyclic loading

Development and Experimental Validation of Dissipative Embedded Column Base Connections for Enhanced Seismic Performance of Steel Moment-Resisting Frames

Seismic Stability of Wide-Flange Steel Columns Interacting with Embedded Column Base Connections

Hysteretic Behavior of Circular Hollow Section Panel Zones in Beam-to-Column Subassemblies with Large Panel Aspect Ratio

Development of dissipative embedded columns base connections for mitigating column axial shortening

Utilization of wavelet-based damage-sensitive features for structural damage assessment of steel braced frames

Proposed Stiffener Spacing Requirements for the Seismic Design of Short Links in Eccentrically Braced Steel Frames

Experimental Study to Validate an Improved Approach to Design Acceleration-Sensitive Nonstructural Components

Proposed methodology for earthquake-induced loss assessment of instrumented steel frame buildings: building-specific and city-scale approaches