Accidental eccentricities, frame shear forces and ductility demands of buildings with uncertainties of stiffness and live load

De-la-Colina, Jaime; González-Pérez, Carlos Alberto; Valdés-González, Jesús

doi:10.1016/j.engstruct.2016.06.012

Cited by 9 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…En la figura 6 se observa que la cola derecha de los histogramas de los pisos superiores es más alargada que en los pisos inferiores, indicando que para un valor fijo de la probabilidad de exceder dicho valor es mayor en los pisos superiores que en los inferiores. Este resultado coincide con los de otros autores (De la Colina, et al, 2011;García, 2015y De la Colina, et al, 2016, en el sentido de que, en un edificio, la torsión accidental es mayor para los entrepisos superiores que para los inferiores. La figura 7 muestra los histogramas de para las 16 columnas del marco X1 del modelo M4C6 para los parámetros de respuesta EsfN, VXC y VYC.…”

Section: Resultados De Histogramas De Factores Para El Modelo M4c6unclassified

“…En realidad, la excentricidad accidental es de naturaleza aleatoria, por lo que el valor estipulado por los reglamentos es solamente una aproximación determinista. Estudios recientes que han abordado el problema de la torsión accidental (Nelson, 2001;Escobar et al, 2002;Hernández and López, 2004;Escobar et al, 2004;De la Colina et al, 2011;García, 2015;De la Colina et al, 2016) sugieren proponer otros procedimientos para tomar en cuenta sus efectos en el diseño sísmico de edificios.…”

Section: Introductionunclassified

“…y(De la Colina, et al, 2016). La tabla 2 resume las variables aleatorias y los parámetros requeridos para definir sus respectivas fdp's.…”

unclassified

See 2 more Smart Citations

Estimación De Los Efectos De Torsión Accidental Sísmica a Partir De La Amplificación De La Respuesta De Un Modelo Torsionalmente Balanceado

Cortes

Martínez

González

2020

RIS

View full text Add to dashboard Cite

Mediante simulación Monte Carlo y el programa de análisis Canny-E, se analizan dinámicamente ocho modelos estructurales elásticos representativos de edificios de marcos de concreto reforzado de 4, 7 y 10 niveles, con el objetivo de establecer un procedimiento simplificado para tomar en cuenta los efectos de la torsión accidental en el diseño sísmico de edificios. Los resultados muestran que es factible diseñar por torsión sísmica un edificio a base de marcos, representativo de edificios de oficinas, empleando una relación simple que amplifica la respuesta del correspondiente modelo torsionalmente balanceado para estimar los elementos mecánicos y cinemáticos de diseño.

show abstract

Section: Resultados De Histogramas De Factores Para El Modelo M4c6unclassified

Section: Introductionunclassified

See 1 more Smart Citation

Estimación De Los Efectos De Torsión Accidental Sísmica a Partir De La Amplificación De La Respuesta De Un Modelo Torsionalmente Balanceado

Cortes

Martínez

González

2020

RIS

View full text Add to dashboard Cite

show abstract

“…Also, non-uniform distribution of the columns material in r.c. buildings can produce torsional effects [24][25][26][27]: hence the definition of "material eccentricity" e m . Conventional analyses on existing buildings generally consider uniform materials by assuming an average value obtained from an experimental test.…”

Section: Generalitiesmentioning

confidence: 99%

Effect of Material Variability and Mechanical Eccentricity on the Seismic Vulnerability Assessment of Reinforced Concrete Buildings

et al. 2017

View full text Add to dashboard Cite

Abstract:The present paper deals with the influence of material variability on the seismic vulnerability assessment of reinforced concrete buildings. Existing r.c. buildings are affected by a strong dispersion of material strengths of both the base materials. This influences the seismic response in linear and nonlinear static analysis. For this reason, it is useful to define a geometrical parameter called "material eccentricity". As a reference model, an analysis of a two storey building is presented with a symmetrical plan but asymmetrical material distribution. Furthermore, an analysis of two real buildings with a similar issue is performed. Experimental data generate random material distributions to carry out a probabilistic analysis. By rotating the vector that defines the position of the center of strength it is possible to describe a strength domain that is characterized by equipotential lines in terms of the Risk Index. Material eccentricity is related to the Ultimate Shear of non-linear static analyses. This relevant uncertainty, referred to as the variation of the center of strength, is not considered in the current European and Italian Standards. The "material eccentricity" therefore reveals itself to be a relevant parameter to considering how material variability affects such a variation.

show abstract

“…The role of irregularities in the seismic response of buildings [1] is a critical issue in the evaluation of structural reliability, as observed in recent Italian earthquakes [2][3][4][5][6], mainly in those built during the 1960s.…”

Section: Introductionmentioning

confidence: 99%

Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls

2017

View full text Add to dashboard Cite

Abstract:The effect of irregularities due to the non-uniform distribution of material properties on structural elements of a significant real case is here investigated. Mechanical tests performed on a typical Italian reinforced concrete (r.c.) school building built in the 1960s showed irregularity in the distribution of compression strength in columns, even though the construction is featured by substantially symmetric distribution of the frames. Extreme scenarios in the distribution of irregularities in compression strength of concrete columns are analyzed, with the hypothesis of rigid or deformable slabs. The seismic analysis showed the influence of the response due to the irregular distributions of concrete strength. A proposal of equivalent "material eccentricity" is shown to account for the mentioned irregularity. Furthermore, the practical solution of reinforcement to mitigate the effects of irregularities is also described. It consists of couple of external r.c. walls stiffened by r.c. buttresses added to the building, connected by transverse slabs. An extensive reduction of material eccentricity is achieved, together with a relevant improvement in seismic capacity.

show abstract

Accidental eccentricities, frame shear forces and ductility demands of buildings with uncertainties of stiffness and live load

Cited by 9 publications

References 12 publications

Estimación De Los Efectos De Torsión Accidental Sísmica a Partir De La Amplificación De La Respuesta De Un Modelo Torsionalmente Balanceado

Estimación De Los Efectos De Torsión Accidental Sísmica a Partir De La Amplificación De La Respuesta De Un Modelo Torsionalmente Balanceado

Effect of Material Variability and Mechanical Eccentricity on the Seismic Vulnerability Assessment of Reinforced Concrete Buildings

Seismic Reinforcement of a R.C. School Structure with Strength Irregularities throughout External Bracing Walls

Contact Info

Product

Resources

About