Prediction of nonlinear seismic demands of high‐rise rocking wall structures using a simplified modal pushover analysis procedure

Najam, Fawad Ahmed; Qureshi, Muhammad Irshad; Warnitchai, Pennung; Mehmood, Tahir

doi:10.1002/tal.1506

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…The simplified techniques were mostly adopted in different codes [63][64][65]. Recently, more analysis processes have been proposed [66][67][68][69][70][71][72][73].…”

Section: Column Sectionmentioning

confidence: 99%

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Jouneghani

Hosseini

Rohanimanesh

et al. 2023

Turkish Journal of Civil Engineering

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The fundamental period of the seismically isolated buildings may be close to that of the long period pulses of near-filed earthquakes, leading to very large lateral displacements in isolators, which in turn can considerably reduce the stability of isolators, increase the chance of collision of the isolated buildings to adjacent buildings, or even result in overturning of the isolated buildings. Therefore, it is important to control these types of buildings and reduce the amount of lateral displacement in their isolating system. In this study, by conducting a series of time history analyses for a set of five multi-story steel buildings with various numbers of stories from 3 to 14, each having a very stiff core structure and a set of crosswise viscous dampers, connecting the building structure to the core structure at the lowest and the top floors, as well as the same structures without the core structure and dampers, the effect of stiff core and dampers in reducing the lateral displacement at isolators has been shown. Results indicate that by the proposed technique, the lateral displacement of the base isolation system is significantly decreased particularly for low-rise buildings.

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“…The simplified techniques were mostly adopted in different codes [63][64][65]. Recently, more analysis processes have been proposed [66][67][68][69][70][71][72][73].…”

Section: Column Sectionmentioning

confidence: 99%

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Jouneghani

Hosseini

Rohanimanesh

et al. 2023

Turkish Journal of Civil Engineering

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“…Esto sucede debido a la predominancia del primer modo de vibración, dado que la estructura no ha incursionado mucho en el rango no lineal, permite obtener estimaciones aceptables para las derivas empleando los patrones mencionados. Para las demás intensidades, las respuestas son sobreestimadas en los primeros tres niveles y en los últimos niveles subestimados; esto guarda relación con estudios previos (Ahmed Najam et al, 2018;Amini & Poursha, 2017), los cuales obtuvieron una tendencia similar con los patrones tradicionales. También es importante mencionar que la sobre estimación de las derivas en los primeros niveles se explica por la formación de rótulas en dichos niveles, lo que genera desplazamientos grandes en el techo del último nivel, concentrando deformaciones de entre piso en los primeros niveles.…”

Section: Curvatura De Sección En Las Vigas Centralesunclassified

“…Así mismo, Ahmed Najam et al (2018) plantearon un procedimiento que resulta de una simplificación del procedimiento original MPA. La formulación está basada en las mismas asunciones dadas para el desarrollo del procedimiento UMRHA, el cual postula que es posible obtener resultados razonablemente exactos mediante la aplicación de un procedimiento muy parecido al análisis modal clásico, a diferencia que este considera una relación fuerzadesplazamiento no lineal.…”

Section: Introductionunclassified

Estimación de demandas sísmicas usando diferentes patrones básicos de distribución de carga en análisis estático no lineal

Vega Arana,

Chahuares Paucar

2023

ING

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Las demandas sísmicas obtenidas del análisis estático no lineal juegan un papel muy importante en la evaluación o diseño basados en desempeño. Se ha demostrado que los patrones invariantes de distribución de cargas más empleados en estos análisis no siempre son adecuados para representar la acción sísmica en las estructuras cuando estas incursionan en el rango inelástico. Este estudio apunta a realizar una comparación de las demandas estructurales obtenidas de análisis estático no lineal (pushover) empleando diferentes patrones básicos de distribución de carga con las obtenidas de rigurosos análisis no lineales tiempo-historia, las cuales son establecidas como benchmark. Se abarcaron cuatro intensidades sísmicas, así como dos alturas de estructura. Se adoptó el desplazamiento promedio máximo del techo del último nivel obtenido de los diferentes análisis no lineales tiempo-historia como desplazamiento objetivo en los análisis pushover con cada patrón. Los resultados demuestran la falta de precisión que tienen los patrones más empleados para estimar adecuadamente las derivas de entrepiso de los últimos niveles. Se encontró que es posible obtener mejores estimaciones únicamente para los últimos niveles empleando dos patrones de distribución propuestos. Las demandas obtenidas para las curvaturas de sección son aceptables considerando que son cantidades de orden muy bajo.

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“…Consequently, Reyes and Chopra modified this method to improve its precision. More recently, Najam et al simplified this method for a convenient seismic estimation.…”

Section: Introductionmentioning

confidence: 99%

Combination model for conventional pushover analysis considering higher mode vibration effects

Guan

Liu

et al. 2019

Structural Design Tall Build

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Summary This paper aims to propose a combination model for conventional pushover analysis with invariant lateral load patterns to consider the effects of higher mode vibrations on the seismic responses of high‐rise buildings. Rectangular concrete‐filled steel tubular (RCFT) structures having two types of deformation, namely, shear type RCFT frame structures and shear‐flexural type RCFT frame‐shear wall structures, are selected and investigated. Finite element models are created using Perform‐3D. Both pushover analysis with three conventional lateral loading patterns, namely, uniformly distributed loading, first‐mode vibration loading, and concentrated loading at the vertex, and time‐history analysis with 15–21 earthquake records chosen for each RCFT structure are performed. Regression analysis is used to fit the interstory drift ratios obtained by the pushover analysis with those from the time‐history analysis. Further, the relations between the partial regression coefficients and the structural fundamental periods under certain lateral loading patterns are analyzed. On this basis, using these conventional lateral loading patterns, combination models for high‐rise buildings with two types of deformation are proposed and verified. The results demonstrate that the proposed method can estimate the seismic responses of high‐rise buildings with a high accuracy and has the advantages of ease of implementation and operation.

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Prediction of nonlinear seismic demands of high‐rise rocking wall structures using a simplified modal pushover analysis procedure

Cited by 5 publications

References 36 publications

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Building's Controlled Seismic Isolation by Using Upper Horizontal Dampers and Stiff Core

Estimación de demandas sísmicas usando diferentes patrones básicos de distribución de carga en análisis estático no lineal

Combination model for conventional pushover analysis considering higher mode vibration effects

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