Response to seismic sequences of short-period structures equipped with Buckling-Restrained Braces located on the lakebed zone of Mexico City

Guerrero, Héctor; Ruiz‐García, Jorge; Escobar, J. Alberto; Terán‐Gilmore, Amador

doi:10.1016/j.jcsr.2017.06.010

Cited by 23 publications

(17 citation statements)

References 27 publications

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“…As a recommendation, and based on previous studies (e.g. Guerrero, 2016;Guerrero et al, 2018a & b), this material thickness should be between 10% and 20% of the bar diameter. It is highlighted that a thinner thickness of the unbonding material could generate negative effects on the device performance.…”

Section: Figure 1 Scheme Of a Typical Brbmentioning

confidence: 95%

Experimental Behaviour of a Low-Cost Seismic Energy Dissipation Device

Bobadilla¹,

Romero²,

Sánchez³

et al. 2020

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Safety during earthquakes should be a human right and shall be accessible not only to those who can pay for proprietary high-tech devices but to everyone. Based on that, this study has been developed with the intention of helping to improve the seismic safety in the developing world. Within this paper, a low-cost, low-tech seismic energy dissipation device is proposed. Its experimental behavior under seismic loading is assessed. The device type is buckling-restrained brace (BRB) and, according to its characteristics, it is suitable for new and existing, medium- to low-rise structures. First, the device characteristics and fabrication process are presented. Then, its structural response, in terms of the hysteretic behavior, ductility, and dissipated energy – as obtained from experimental tests – is shown. Experimental results show an excellent behavior of the proposed device. As a result, it can be said that the device is reliable and its use is recommended for new, and retrofitting/upgrading existing, structures. Design recommendations are also provided.

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Section: Figure 1 Scheme Of a Typical Brbmentioning

confidence: 95%

Experimental Behaviour of a Low-Cost Seismic Energy Dissipation Device

Bobadilla¹,

Romero²,

Sánchez³

et al. 2020

RIS

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“…A type of BRB, recently proposed by Guerrero [28], was used during this experiment. Figure 17 shows its composing parts.…”

Section: Brb Used In the Experimentsmentioning

confidence: 99%

“…[24][25][26][27]). Certainly, for protecting soft storey structures located in seismic regions, like Mexico City, BRBs could be an effective alternative [28].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Simulation Tests of a Soft Storey Frame Building Upgraded with a Buckling-Restrained Brace (BRB)

Guerrero¹,

Terán‐Gilmore

Zamora³

et al. 2020

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Hybrid simulation (HS) is an experimental technique possessing advantages over other testing methods and, in several cases, it is the only available method to test structural systems with reliability. In this paper, HS is used to assess the effects of upgrading a soft-storey frame building using a Buckling-Restrained Brace (BRB). This topic is of paramount significance in seismic regions like Mexico, where more than 40 structures collapsed and thousands resulted with different levels of damage during the September 19, 2017 Mw 7.1 Earthquake. Unfortunately, one of the still-remaining challenges in many seismic countries is the use of seismic protective technologies (SPT) that help to mitigate damages in structures. With the aim of encouraging the use of SPT, this paper presents the results of an experimental program that shows the effectivity of buckling-restrained braces (BRBs) to improve safety and reduce damages in structures with one of the most typical causes of failure, i.e. the soft storey problem. A reinforced concrete five-storey frame building was selected first. Then, a numerical 2D model of the structure was subjected to nonlinear dynamic analyses using several earthquake ground motions. In many analyses, collapse was observed in the structure model. After that, the model was upgraded by introducing a BRB in the soft storey. HS was used to assess the performance of the upgraded structure under severe earthquake action. While the frame building was modelled numerically, the BRB was tested physically. The tests were repeated using a conventional brace instead of the BRB. The results show that introducing the BRB in the soft storey was an effective measure to improve the structure performance under seismic loading; while the disadvantages of the conventional brace were exposed.

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“…A consecuencia de la réplica ocurrida al día siguiente, varias estructuras incrementaron su estado de daño, o terminaron con desplazamientos laterales permanentes excesivos al final de la excitación. No obstante este hecho, muy pocas investigaciones se han desarrollado para investigar el efecto de las réplicas en la respuesta de estructuras desplantadas en terreno blando (Ruiz-García et al, 2014;Díaz-Martínez et al, 2014;Guerrero et al, 2017). Otro ejemplo de la acción de réplicas intensas se pudo observar durante la secuencia sísmica evento principal-réplicas ocurrida en Nueva Zelanda en los años 2010-2011, dado que el evento principal ocurrió el 4 de septiembre de 2010 (Mw=7.1) y, posteriormente, ocurrieron una serie de réplicas intensas, siendo la más intensa la ocurrida el 22 de febrero de 2011 (Mw=6.3).…”

Section: Introductionunclassified

Comportamiento De Edificios De Acero Con Contraventeos Excéntricos Ante Secuencias Sísmicas

García

Mora

Villar

et al. 2019

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En este artículo se presentan los resultados de un estudio analítico enfocado a evaluar el comportamiento sísmico de edificios de acero estructurados a base de marcos y contraventeos excéntricos (MCE). Para tal fin, se modelaron dos MCE de 4 y 8 niveles mediante la plataforma computacional OpenSees. En particular, se modeló el comportamiento histerético de los eslabones en los contraventeos excéntricos considerando un criterio de falla, así como la zona del panel en las uniones viga-columna. Los MCE en estudio fueron sometidos a un conjunto de secuencias sísmicas evento principal-réplicas artificiales, las cuales son representativas de secuencias registradas en terreno blando de la Ciudad de México. Los resultados de está investigación indican que los eslabones pueden fallar ante la acción de réplicas intensas, lo cual conduce a un incremento de sus demandas de distorsión máxima de entrepiso respecto a las originadas por el evento principal. Ante esta situación, se observó que las vigas y columnas cercanas al eslabón que falla exhiben un comportamiento inelástico, lo cual es contrario a su filosofía de diseño. Finalmente, se aprecio que los MCE exhiben una concentración de distorsión máxima de entrepiso en los pisos inferiores dado que los eslabones no tienen un comportamiento histerético uniforme en la altura, lo cual desaprovecha su capacidad de disipación de energía.

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Response to seismic sequences of short-period structures equipped with Buckling-Restrained Braces located on the lakebed zone of Mexico City

Cited by 23 publications

References 27 publications

Experimental Behaviour of a Low-Cost Seismic Energy Dissipation Device

Experimental Behaviour of a Low-Cost Seismic Energy Dissipation Device

Hybrid Simulation Tests of a Soft Storey Frame Building Upgraded with a Buckling-Restrained Brace (BRB)

Comportamiento De Edificios De Acero Con Contraventeos Excéntricos Ante Secuencias Sísmicas

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