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Seismic Assessment and Retrofit of Pre-Northridge High Rise Steel Moment Resisting Frame Buildings with Bilinear Oil Dampers

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Seismic retroﬁt of existing steel concentrically braced frame with friction dampers

Inthecontextoflowtointermediateseismichazardregion,thisMasterprojectevaluate,thanks to a case study, the potential of friction dampers as retroﬁt solution of existing Concentrically Braced Frames (CBF). Simple to design and economic to build, they are comm ...

2020

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

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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

Seismic collapse performance of Los Angeles soft, weak, and open-front wall line woodframe structures retrofitted using different procedures

Aryan Rezaei Rad, Henry V. Burton

The Los Angeles Soft-Story Ordinance was enacted with the goal of reducing the collapse risk of woodframe buildings with soft, weak and open-front (SWOF) wall lines. Four alternative retrofit methods are permitted under the Ordinance including a SWOF-wall- ...

SPRINGER2019

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

A Framework to Evaluate the Benefit of Seismic Upgrading

Pierino Lestuzzi, Clotaire Michel

The framework to evaluate the benefit of seismic upgrading of Galanis et al. (2018) is compared to that present in the Swiss seismic code for existing buildings since 2004, updated in 2017. To illustrate the comparison, the example building of Galanis et a ...

2019

Capacity design principles for the ductile behaviour of conventional and high-performance steel structures under earthquake shaking

Dimitrios Lignos

Steel lateral load-resisting systems offer a variety of design solutions to ensure a ductile behaviour of a structure during a seismic event, thereby achieving a relatively low earthquake-induced collapse risk, if designed and detailed properly according t ...

Centre suisse de la construction métallique (SZS)2019

Improving the collapse risk of steel structures with high-performance steel

Dimitrios Lignos

With the advent of material science, high-performance steel materials have been developed for seismic applications that potentially reduce the earthquake-induced collapse risk of steel frame buildings. The High Yield Point (HYP400) steel is one of those ma ...

2018

Revised ASCE-41 modeling recommendations for moment-resisting frame systems

Dimitrios Lignos, Ahmed Mohamed Ahmed Elkady, Alexander Riley Hartloper

Nonlinear static and dynamic analysis is utilized by engineers to evaluate the seismic behavior of new and existing structures in the context of performance-based earthquake engineering. Numerous experiments on steel moment-resisting frames and their compo ...

2018

Seismic Performance Evaluation and Retrofit of Existing Steel Frame Buildings

Existing steel frame buildings in Switzerland that have been designed from the early 1970s typically utilized a steel lateral load resisting system with practically no seis- mic design requirements. However, Switzerland is a moderate seismicity zone and th ...

2018