Energy Dissipation at PR Frames under Seismic Loading

Salazar, Alfredo Reyes; Haldar, Achintya

doi:10.1061/(asce)0733-9445(2001)127:5(588)

Cited by 32 publications

(13 citation statements)

References 8 publications

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“…It is then checked for serviceability-related issues like overall lateral and inter-story stiffness to assure that it does not develop excessive lateral and inter-story deformations. From the past studies [32,33], the research team members of the authors observed that the structural members are generally designed conservatively but the structure may not be able to satisfy the serviceability limit states, particularly when lateral load caused by the seismic excitation controls the design. Most of these structures fail by developing excessive lateral or inter-story deformation.…”

Section: Performance Levelsmentioning

confidence: 99%

A novel reliability technique for implementation of Performance-Based Seismic Design of structures

Gaxiola‐Camacho

Azizsoltani

Villegas-Mercado

et al. 2017

Engineering Structures

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A unified Performance-Based Seismic Design (PBSD) procedure is proposed and successfully implemented. It provides an alternative to the currently used life safety design requirement. To successfully develop the concept, structures are represented by finite elements and excited by the seismic loading in time domain. A novel reliability evaluation procedure is proposed for such representation. An improved response surface based procedure is proposed by combining it with the First-Order Reliability Method (FORM) and the appropriate response surfaces are constructed by combining the saturated design and the central composite design sampling schemes. Performances are defined in terms of Collapse Prevention (CP), Life Safety (LS), and Immediate Occupancy (IO), as commonly used in the profession. The corresponding risks are evaluated by exciting a 9-story steel frame designed by experts satisfying all post-Northridge seismic design requirements. It was excited by 20 earthquake time histories for each

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Section: Performance Levelsmentioning

confidence: 99%

A novel reliability technique for implementation of Performance-Based Seismic Design of structures

Gaxiola‐Camacho

Azizsoltani

Villegas-Mercado

et al. 2017

Engineering Structures

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“…They did not consider the inelastic behavior and energy dissipation of the structural elements existing in actual systems. Reyes-Salazar and Haldar [19][20][21][22] found that moment resisting steel plane frames are very efficient in dissipating earthquake-induced energy and that the dissipated energy has an important effect on the structural response. Reyes-Salazar [23] showed that the values of strength reduction factors depend on the amount of dissipated energy, which in turn depends on the plastic mechanism formed in the frames as well as on the loading, unloading and reloading process at plastic hinges.…”

Section: Literature Reviewmentioning

confidence: 99%

Strength or force reduction factors for steel buildings: MDOF vs SDOF systems

Reyes‐Salazar¹,

Llanes-Tizoc²,

Bojórquez³

et al. 2017

J. vibroeng.

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The nonlinear seismic responses of steel buildings with perimeter moment resisting frames (MRF), modeled as complex 3D MDOF systems, are calculated and the ductility demands, ductility reduction factors and the force reduction factors (), are studied. Equivalent 3D models with spatial MRF, two-dimensional models, and equivalent SDOF systems (SD), are also considered. Results indicate that the global and local force reduction factors significantly vary from one structural representation to another and that they are much larger for the SD models. One of the reasons for this is that, although there is equivalence between the SD and MDOF models, the dissipated energy and the number of incursions in the inelastic range are significantly larger for the SD models. In addition, while for the SD models total plasticization occurs, for the SAC and EQ models, even for significant yielding, plastic hinges are developed only in a relatively small number of structural members; therefore, using the factors of the SD models may be conservative. According to the results obtained in this research for the more realistic representation of the steel building (3D), the value of 8 suggested in many codes for the factor for ductile MRF cannot be justified. It is only justified for the SD systems. The implication of this is that non-conservative designs may be obtained if so large value is used. More transparence is needed in the codes regarding the magnitude and the components involved in the factor.

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“…El comportamiento inelástico de los elementos estructurales existentes en sistemas complejos, como edificios de varios niveles, y los mecanismos de disipación de energía que en ellos se presentan no han sido explícitamente considerados. , Reyes Salazar y Haldar (1999( , 2001a( , 2001b( ) y Bojórquez et al (2010 mostraron que la energía disipada tiene un efecto muy importante en la respuesta estructural de edificios de acero con marcos resistentes a momento. Más recientemente, ReyesSalazar et al (2004ReyesSalazar et al ( , 2008, mediante análisis paso a paso no lineales de sistemas complejos de varios grados de libertad, observaron que tanto la regla del 30% como la SRSS pueden subestimar la respuesta combinada para el caso de las componentes horizontales y que los mecanismos de disipación de energía se deben considerar de la forma más precisa posible.…”

Section: Revisión De Literatura Y Objetivosunclassified

Reglas De Combinación De Los Efectos De Las Tres Componentes De Terremotos Y Respuesta Crítica

Valenzuela-Beltran

Salazar

Escobedo

et al. 2015

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Revista de Ingeniería Sísmica No. 92 65-94 (2015) _____________________________________________ Artículo recibido el 24 de febrero de 2014 y aprobado para su publicación el 20 de agosto de 2015. Se aceptarán comentarios y/o discusiones hasta cinco meses después de su publicación.(1) Facultad de Ingeniería, Universidad Autónoma de Sinaloa, Calzada de las Américas y Boulevard Universitarios S/N, Ciudad Universitaria, Culiacán, Sinaloa, México, C.P. 80040. f.valenzuelab@hotmail.com, reyes@uas.edu.mx, eden@uas.edu.mx, alopezb@uas.edu.mx (2) RESUMENLa precisión de las reglas de combinación del 30% y SRSS, y la orientación crítica de las componentes de terremotos se estudian en este trabajo. Se analizan modelos estructurales complejos que representan edificios de baja y mediana altura. Se realiza un análisis estadístico de la precisión de las reglas de combinación aplicadas a parámetros de respuesta individuales y múltiples. El efecto de la correlación entre las componentes de los terremotos en dicha precisión también se estudia. Finalmente, se realizan análisis con varios ángulos de incidencia de las componentes con la finalidad de encontrar la orientación crítica. Los resultados muestran que las reglas subestiman la carga axial en columnas, pero sobreestiman razonablemente los cortantes de entrepiso. Ambas reglas son más conservadoras cuando los modelos se excitan por las tres componentes. Los efectos individuales pueden estar altamente correlacionados, incluso para componentes principales no correlacionadas. Las reglas no siempre son precisas para valores pequeños de coeficientes de correlación, y valores altos de éstos no siempre están relacionados a una estimación imprecisa de la respuesta combinada. La precisión de las reglas de combinación depende del grado de correlación de las componentes, del parámetro de respuesta, de la localización del elemento considerado y del nivel de deformación estructural.Palabras clave: códigos de diseño sísmico; edificios de acero; reglas de combinación; correlación de los efectos individuales; respuesta crítica COMBINATION RULES OF THE EFFECTS OF THREE COMPONENTS OF EARTHQUAKES AND CRITICAL RESPONSE ABSTRACTThe accuracy of the 30% and SRSS rules, the critical orientation of the components of earthquakes, and some related issues, are studied in this work. Complex structural models representing low and medium height buildings are analyzed. A statistical analysis of the precision of the combination rules, applied to individual and multiple response parameters, is performed. The effect of the correlation of the components of earthquakes in such precision is also studied. Finally, several analyses with various incidence angles of the components are performed with the purpose of finding the critical orientation. Results show that the rules underestimate the axial load in columns, but reasonably overestimate the interstory shears. Both rules are more conservative when the models

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Energy Dissipation at PR Frames under Seismic Loading

Cited by 32 publications

References 8 publications

A novel reliability technique for implementation of Performance-Based Seismic Design of structures

A novel reliability technique for implementation of Performance-Based Seismic Design of structures

Strength or force reduction factors for steel buildings: MDOF vs SDOF systems

Reglas De Combinación De Los Efectos De Las Tres Componentes De Terremotos Y Respuesta Crítica

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