Publication
The Role of the Composite Floor System and Framing Action in the Seismic Performance of Composite Steel Moment-Resisting Frames
Related publications (190)
A Softening Constitutive Law and Gradient-Inelastic Fiber-Based Element for 3-Dimensional Frame Simulations Under Seismic Excitations
Steel frame structures are essential components of modern infrastructure. Understanding their behavior under seismic loading is critical for ensuring public safety and minimizing damage that occurs during earthquakes. To accurately predict the response of ...
EPFL2024Full Scale Experiments of a Composite Steel Moment Resisting Frame: Behavioral Insights and Implications on Seismic Design
Dimitrios Lignos, Hammad El Jisr
This paper discusses the cyclic performance of a heavily instrumented 2-bay full-scale composite-steel moment resisting frame (CMRF) sub-system from the onset of structural damage up until incipient collapse. The CMRF featured stiffened end plate bolted co ...
EEME2023The use of ductile steel fuses for the seismic protection of acceleration sensitive non- structural components: Numerical and Experimental verification
Dimitrios Lignos, Ahmed Mohamed Ahmed Elkady
Recent seismic events have showcased the vulnerability of non-structural components to even low- or moderate-intensity earthquakes that occur far more frequently than design-basis ones. Thus, community-critical buildings, such as hospitals, telecommunicat ...
EEME2023Full-Scale Experiments of Cyclically Loaded Welded Moment Connections with Highly Dissipative Panel Zones and Simplified Weld Details
Dimitrios Lignos, Andronikos Skiadopoulos
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 customized beveled ...
2023Towards instability-free welded moment connections
Dimitrios Lignos, Andronikos Skiadopoulos
In capacity-designed steel moment resisting frames (MRFs), inelastic deformations are mostly concentrated in the steel beams and the column fixed ends of the first story, while the participation of the panel zones in energy dissipation is limited. In such ...
2023Geometric tolerances of welded connections with inelastic panel zones
Dimitrios Lignos, Andronikos Skiadopoulos, Ce Wen
Prequalified beam-to-column connections in steel moment resisting frames usually concentrate inelastic deformations in the steel beam ends. As such, nonlinear geo-metric instabilities (i.e., local buckling) may occur in these regions at modest lateral drif ...
Ernst & Sohn2023Hysteretic behaviour of welded connections with highly inelastic panel zones
Dimitrios Lignos, Andronikos Skiadopoulos
The current practice in capacity-designed steel moment resisting frames (MRFs) worldwide allows for limitedshear yielding in the column web panel zone. As such, inelastic deformations concentrate near the beam ends, thereby leading to flexural stre ...
Ernst & Sohn2023The new Chapter 9 of Eurocode 8 Part 3 for Seismic Assessment of Existing Steel Structures
The seismic assessment of existing steel structures necessitates the development of practice- oriented engineering models for use in nonlinear static and dynamic analysis procedures. These models should encompass the full range of the anticipated nonlinear ...
2023Surrogate modelling for seismic collapse risk assessment of steel moment resisting frames
Dimitrios Lignos, Andronikos Skiadopoulos, Nenad Bijelic
With the overall goal of reducing the numerical burden of uncertainty quantification involved in seismic risk assessments, this paper examines opportunities for assessment of seismic collapse capacity and risk using data-driven surrogates as a complement t ...
2023Proposed Panel Zone Model for Beam-To-Column Joints in Steel Moment Resisting Frames
Dimitrios Lignos, Andronikos Skiadopoulos, Ahmed Mohamed Ahmed Elkady
In capacity designed steel moment resisting frames (MRFs), beam-to-column joints (i.e., panel zones) are designed to remain elastic. To potentially exploit the beneficial aspects of the stable panel zone hysteretic response in shear, a robust panel zone mo ...
2023