Seismic Response Modification Factors

Whittaker, Andrew S.; Hart, Gary C.; Rojahn, Christopher

doi:10.1061/(asce)0733-9445(1999)125:4(438)

Cited by 110 publications

(72 citation statements)

References 4 publications

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“…However, it is important to note that they did not suggest a way to incorporate redundancy effect into procedures of structural design. Whittaker et al (1999) used a reliability index to investigate the redundancy of structures under earthquake excitations assumed to be deterministic. They recommended four lines of strength and deformation compatible vertical seismic framing in each principle direction of a building as the minimum for adequate redundancy.…”

Section: Latin American Journal Of Solids and Structures 13 (2016) 20mentioning

confidence: 99%

Redundancy Factors for the Seismic Design of Ductile Reinforced Concrete Chevron Braced Frames

Godãnez-Domãnguez

Tena‐Colunga

2016

Lat. Am. j. solids struct.

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In this paper the authors summarize the results of a study devoted to assess, using nonlinear static analyses, the impact of increasing the structural redundancy in ductile moment-resisting reinforced concrete concentric braced frames structures (RC-MRCBFs). Among the studied variables were the number of stories and the number of bays. Results obtained were compared with the currently proposed values in the Manual of Civil Structures (MOC-08), a model code of Mexico. The studied frames have 4, 8, 12 and 16-story with a story height h=3.5 m. and a fixed length L=12 m., where 1, 2, 3 or 4 bays have to be located. RC-MRCBFs were assumed to be located in soft soil conditions in Mexico City and were designed using a capacity design methodology adapted to general requirements of the seismic, reinforced concrete and steel guidelines of Mexican Codes. From the results obtained in this study it is possible to conclude that a different effect is observed in overstrength redundancy factors respect to ductility redundancy factors due to an increase of the bay number considered. Also, the structural redundancy factors obtained for this particular structural system varies respect to the currently proposed in MOC-08.

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Section: Latin American Journal Of Solids and Structures 13 (2016) 20mentioning

confidence: 99%

Redundancy Factors for the Seismic Design of Ductile Reinforced Concrete Chevron Braced Frames

Godãnez-Domãnguez

Tena‐Colunga

2016

Lat. Am. j. solids struct.

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“…En Whittaker et al (1999) se presentan varios trabajos de investigación que se han realizado a nivel mundial, para determinar los factores que intervienen en el cálculo del factor de reducción de las fuerzas sísmicas R y a continuación se presentarán el resultado de los estudios realizados en el Centro de Investigaciones Científicas, CEINCI, de la Politécnica del Ejército.…”

Section: Componentes Del Factor Runclassified

Análisis del factor de reducción de las fuerzas sísmicas

Falconí¹

2008

Rev. Sul. Eng. Est.

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ResumenSe analizan los factores que intervienen en el cálculo del factor de reducción de las fuerzas sísmicas, el mismo que permite pasar del espectro elástico al espectro de diseño inelástico y que se encuentra estipulado en las normativas sísmicas en forma muy general, para varias tipologías estructurales. Para el efecto, se presentan resultados de investigaciones desarrolladas sobre el cálculo de los factores de ductilidad, resistencia y redundancia. Se presenta el cálculo del factor de ductilidad, sin considerar y considerando el tipo de suelo; para el primer caso se trabaja con 63 acelerogramas de sismos registrados en: Colombia, Perú, Chile y Argentina; para el segundo caso se trabaja con 28 acelerogramas sintéticos que generan los espectros del Código Ecuatoriano de la Construcción, para los cuatro perfiles de suelo. Por otra parte, se describe la metodología utilizada para el cálculo del factor de resistencia, en 10 edificios de hormigón armado, en la que se obtiene la capacidad al corte de las estructuras, aplicando la Técnica del Pushover y el cortante de diseño, aplicando el Método del Espectro de Capacidad. Finalmente, el factor de redundancia, se halla en función de dos índices, que son: el de resistencia y el de rótulas plásticas. Para el primer índice se trabaja con la relación momento curvatura y para el segundo índice se toma en cuenta el número de rótulas que se forman en un pórtico y el número de pórticos. Así mismo, se obtiene el factor de redundancia y de ductilidad para los 10 edificios.

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“…R R is the redundancy factor which is considered as 1.0 as suggested by American code (ASCE7) [1]. R ζ is the damping factor which is of prime importance, when damping devices are installed in the structure, otherwise the factor shall be considered as 1.0 [4]. Thus, the response reduction factor value varies based on all these parameters.…”

Section: Introductionmentioning

confidence: 99%

Assessment of seismic response reduction factor for moment resisting RC frames

Nishanth

Visuvasam

Simon

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The response reduction factor or response modification factor (R) plays an important role in the non-linear response of the moment resisting reinforced concrete (RC) frames. Implementing this factor in the design, accounts for the non-linear response of a structure. The study emphasizes on evaluating the actual values of the response reduction factor for moment resisting RC frames. The estimation of this factor is carried out by performing a detailed nonlinear static pushover analysis of 2D framed structures of both ductile and ordinary moment resisting frames.Different parameters considered for the study includes variation of height of the structure, the zone factor and considering the effect of geometric non-linearity of the structure in the analysis. The results indicate that the values of R as given by the codes are of higher degree. From the analysis, arelationship between R-T-Zhas been studied. It is found that the values of over-strength, ductility and response reduction factors are highly affected by seismic zones and time period of the structure.

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Seismic Response Modification Factors

Cited by 110 publications

References 4 publications

Redundancy Factors for the Seismic Design of Ductile Reinforced Concrete Chevron Braced Frames

Redundancy Factors for the Seismic Design of Ductile Reinforced Concrete Chevron Braced Frames

Análisis del factor de reducción de las fuerzas sísmicas

Assessment of seismic response reduction factor for moment resisting RC frames

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