Method n2   according to fajfar

Dautaj, Arton; Sadiku, Hajdar; Kabashi, Naser

doi:10.15224/978-1-63248-042-2-95

Cited by 4 publications

(4 citation statements)

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“…The N2 method, initially developed by Fajfar [ 52 ], is a method that requires the application of a nonlinear method based on two mathematical models (hence, the acronym N2) [ 53 ]. The N2 procedure has been extensively used to perform seismic response analysis of various structural typologies, as presented in [ 54 , 55 ].…”

Section: Applied Methodologymentioning

confidence: 99%

Seismic Performance Assessment of a Moment-Resisting Frame Steel Warehouse Provided with Overhead Crane

2023

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The purpose of this study is to analyze the nonlinear behavior of a steel warehouse structured by moment-resistant frames, which utilizes an overhead crane on its interior brackets and as an external load of the weight of the lining panels. The analysis methods used are (i) pushover analysis, which consists of applying an incremental force in the transverse and longitudinal direction to obtain the capacity curve of the structure; (ii) time-history analysis, in which different records of destructive earthquakes that occurred in Chile are used in order to analyze the response of the structure to these loads. The results indicate that the transverse direction is more ductile than the Y direction of the structure within the pushover and time-history methods but not using the N2 method. It is also found that most of the columns are within the life safety and collapse prevention criteria. It is concluded that most of the analyses agree with each other and with what is expected, except for the N2 method, which contradicts the results of the time-history analysis, so the N2 method would not be suitable for this type of structure. In addition, it has been determined that the overhead crane loads do not substantially affect the seismic performance of the warehouse.

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Section: Applied Methodologymentioning

confidence: 99%

Seismic Performance Assessment of a Moment-Resisting Frame Steel Warehouse Provided with Overhead Crane

2023

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“…The modified Capacity Spectrum Method proposed by Fajfar [71,72] has been used to determine the Performance Point imposed on the case study through the lateral forces applied during the Static Nonlinear Analysis, see Figure 3. redistribution of stress.…”

Section: Non-linear Static Analysis (Pushover Analysis)mentioning

confidence: 99%

Evaluating Seismic Performance in Reinforced Concrete Buildings with Complex Shear Walls: A Focus on a Residential Case in Chile

Aguayo,

Carvallo,

Vielma

2024

Buildings

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This study employs a non-linear static analysis, known as pushover analysis, to explore the flexural-compressive behavior of complex shear walls within a reinforced concrete (R.C.) structure, adhering to contemporary design standards in Chile. The primary objective is to assess the initiation of damage as the building approaches the limit states outlined in Achisina’s seminal “Performance Based Seismic Design” framework. To achieve this, a sophisticated fiber model, accounting for the confined behavior of concrete derived from the structural elements’ detailing, has been uniformly integrated across the building’s entire height. Furthermore, the analysis incorporates a rigid diaphragm to simulate the R.C. slab’s response accurately. The study implements the N2 method, adjusting for seismic demands in an acceleration-displacement format, which leverages the displacement spectrum defined by Supreme Decree 61, a legislative response to the 8.8 Mw Maule earthquake in 2010. The findings reveal that the analyzed structure meets the immediate occupancy performance level with drifts nearing 5‰ in the symmetrical Y direction. This outcome aligns with prior assessments of Chilean R.C. wall buildings. However, in the asymmetric X direction, the structure exhibits a higher degree of structural damage, aligning with a life safety performance level. This differentiation underscores the critical need for nuanced understanding and modeling of structural behavior under seismic loads, contributing to the ongoing refinement of seismic design practices and standards.

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“…Para evaluar el performance point, el método N2 fue aplicado sobre la estructura de forma bidireccional (Figura 2). Este enfoque determinístico facilita la evaluación del desempeño, a través de la superposición gráfica del espectro de capacidad (obtenido a partir de transformaciones modales) y el espectro de aceleracióndesplazamiento (Dautaj et al, 2015). El espectro de capacidad es previamente bi-linealizado a partir del método de compensación de Park (1988).…”

Section: Método N2 Y Performance Pointunclassified

“…Al determinar el performance point se conocerá la deriva global para evaluar el desempeño a nivel del SD. El método de Fajfar ha sido implementado, ya que permite una aplicación racional y práctica en la evaluación del desempeño sísmico (Dautaj et al, 2015).…”

Section: Método N2 Y Performance Pointunclassified

Análisis no lineal estático con empuje incremental para la evaluación del nivel de desempeño de una edificación típica habitacional de muros de hormigón armado

Aguayo,

Vielma,

Carvallo

2024

obrasypro

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El análisis estático no lineal ha sido desarrollado en un edificio de hormigón armado para estudiar el comportamiento a flexo-compresión de los muros de corte y estimar el daño a partir del cumplimiento de estados límites definidos en el documento de Diseño basado en desempeño de ACHISINA. Un modelo refinado de fibra distribuida ha sido incorporado en toda la altura del edificio considerando el comportamiento confinado del hormigón a partir del detallamiento de las secciones estructurales. Un diafragma rígido ha sido considerado en la estructura para modelar el comportamiento de la losa de hormigón armado. El métodoN2 ha sido implementado considerando la demanda sísmica en formato aceleración - desplazamiento a partir del espectrode desplazamiento establecido en el DS61, redactado posteriormente al terremoto Mw = 8.8 del Maule del 2010. Considerando los resultados, se concluye que la estructura obtiene un nivel de desempeño de ocupación inmediata para drifts cercanos al 5‰ en la dirección simétrica Y, mientras que en la dirección asimétrica X se observa una mayor cantidad de daños proporcional a un nivel de seguridad de la vida.

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Method n2 according to fajfar

Cited by 4 publications

References 0 publications

Seismic Performance Assessment of a Moment-Resisting Frame Steel Warehouse Provided with Overhead Crane

Seismic Performance Assessment of a Moment-Resisting Frame Steel Warehouse Provided with Overhead Crane

Evaluating Seismic Performance in Reinforced Concrete Buildings with Complex Shear Walls: A Focus on a Residential Case in Chile

Análisis no lineal estático con empuje incremental para la evaluación del nivel de desempeño de una edificación típica habitacional de muros de hormigón armado

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