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Dimitrios Lignos

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Related publications (155)

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

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 ...

2020

Experimental Evaluation and Numerical Modeling of Wide-Flange Steel Columns Subjected to Constant and Variable Axial Load Coupled with Lateral Drift Demands

Dimitrios Lignos, Ahmed Mohamed Ahmed Elkady

This paper presents results from an experimental evaluation on the pre- and post-buckling behavior of 12 steel wide-flange cantilever columns under axial load and lateral drift demands. The influence of several loading and geometric parameters, including t ...

2020

EaRL—Software for Earthquake Risk, Loss and Lifecycle Analysis

Dimitrios Lignos, Ahmed Mohamed Ahmed Elkady

Performance-based earthquake engineering (PBEE) has become an increasingly popular framework to design, retrofit and manage structures. This probabilistic framework integrates data from the seismic hazard, structural response, damage fragility and damage c ...

2020

Proposed methodology for building-specific earthquake loss assessment including column residual axial shortening

Dimitrios Lignos, Ahmed Mohamed Ahmed Elkady

This paper proposes methodological developments for quantifying the impact of residual axial shortening of first-story steel columns on earthquake loss estimations in steel moment-resisting frame (MRF) buildings. A new formulation is proposed that accounts ...

2020

Hysteretic Behavior of Moment-Resisting Frames Considering Slab Restraint and Framing Action

Dimitrios Lignos, Hammad El Jisr, Ahmed Mohamed Ahmed Elkady

This paper examines the influence of framing action and slab continuity on the hysteretic behavior of composite steel moment-resisting frames (MRFs) by means of high-fidelity continuum finite-element (CFE) analyses of two-bay subsystems and typical crucifo ...

2020

Experimental Study of Sliding Friction Damper for High-Performance Steel Structures

Martina Paronesso, Dimitrios Lignos

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 yield dampers, su ...

Earthquake Engineering Association2020

Development of collapse-consistent loading protocols for experimental testing of steel columns

Dimitrios Lignos

In order to effectively utilize results from quasi-static cyclic testing on structural components for the earthquake-induced collapse risk quantification of structures, the need exists to establish collapse-consistent loading protocols representing the asy ...

2020

Experimental investigation of steel building gravity framing systems under strong earthquake shaking

Dimitrios Lignos

Hybrid simulations were conducted to evaluate the system-level seismic response of a 4-story steel moment frame building and its gravity framing system through various levels of ground motion shaking. The experimental substructure examined in detail corres ...

2019

An explicit model for exposed column base connections and its parameter sensitivity

Albano António De Abreu E Presa De Castro E Sousa, Dimitrios Lignos, Hiroyuki Inamasu

Exposed column bases are the connection type most often employed in low to mid-rise steel moment resisting frames. Design typically follows idealized conditions for their boundaries, i.e. either pinned or fixed. In truth, the bases' behavior falls between ...

2019

Behavior of iron-based Shape Memory Alloys under Cyclic Loading Histories

Albano António De Abreu E Presa De Castro E Sousa, Diego Isidoro Heredia Rosa, Masoud Motavalli, Dimitrios Lignos, Alexander Riley Hartloper

Shape memory alloys (SMAs) have gained considerable attention in a broad range of engineering applications. In particular, iron-based SMAs (Fe-SMAs) have been recently developed and used as a cost-effect method for prestressed-strengthening of civil struct ...

2019

Composite steel beam database for seismic design and performance assessment of composite-steel moment-resisting frame systems

Dimitrios Lignos, Hammad El Jisr, Ahmed Mohamed Ahmed Elkady

This paper discusses the development of a publicly available database of composite steel beam-to-column connections under cyclic loading. The database is utilized to develop recommendations for the seismic design and nonlinear performance assessment of ste ...

2019

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

Dimitrios Lignos, Hiroyuki Inamasu

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 ...

2019

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

Dimitrios Lignos

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 ...

CEI / SCE2019

Recommendations for Improved Welding Procedures for Thick Steel Plates Through Thermo-Mechanical Analysis

Dimitrios Lignos

Welding of steel plates is accompanied by residual stresses that increase as the constraint provided by the welded components becomes greater. Consequently, crack initiation has been reported after welding thick plates due to the high residual stresses dev ...

2019

Proposed Updates to the ASCE 41 Nonlinear Modeling Parameters for Wide-Flange Steel Columns in Support of Performance-Based Seismic Engineering

Dimitrios Lignos, Alexander Riley Hartloper, Ahmed Mohamed Ahmed Elkady

Nonlinear static and dynamic analyses are utilized by engineers for performance-based seismic risk evaluation of new and existing structures. In this context, nonlinear component modeling criteria are typically based on ASCE 41 guidelines. Experiments on w ...

2019

Sensitivity of Simulated Steel Column Instabilities to Plasticity Model Assumptions

Albano António De Abreu E Presa De Castro E Sousa, Dimitrios Lignos, Alexander Riley Hartloper

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 ...

2019

Full-scale testing of stiffened extended shear tab connections under combined axial and shear forces

Dimitrios Lignos

Owing to the lack of a comprehensive published procedure for the design of stiffened extended shear tabs, practicing engineers usually follow design guides for unstiffened shear tabs. The results of recent laboratory experiments and numerical analyses have ...

2019

Concepts to minimize earthquake-induced column axial shortening in steel moment-resisting frames

Dimitrios Lignos, Hiroyuki Inamasu

Capacity-designed steel moment-resisting frames (MRFs) dissipate the seismic action through inelastic flexural yielding of protected zones located at the beam ends and the first story column bottom end. During low-probability of occurrence seismic events, ...

2019

Exposed Column Base Connections for Minimizing Earthquake-induced Residual Deformations in Steel Moment-Resisting Framess

Albano António De Abreu E Presa De Castro E Sousa, Dimitrios Lignos, Hiroyuki Inamasu

This paper proposes a new exposed column base (XCB) design concept for steel moment-resisting frames (MRFs) that promotes anchor rod yielding rather than plastic hinging at the bottom of the first story columns. A mechanics-based numerical model is first d ...

2019

Steel Columns under Multi-Axis Seismic Loading: Experimental Findings and Design Recommendations

Dimitrios Lignos, Ahmed Mohamed Ahmed Elkady

This paper summarizes the findings of two test programs that investigated the hysteretic behavior of wide-flange columns in steel moment-resisting frames. Both deep and shallow steel columns were examined. The members were subjected to unidirectional and b ...

Trans Tech Publications2018

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