scholarly journals Enhanced Seismic Structural Reliability on Reinforced Concrete Buildings by Using Buckling Restrained Braces

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Victor Baca ◽  
Juan Bojórquez ◽  
Edén Bojórquez ◽  
Herian Leyva ◽  
Alfredo Reyes-Salazar ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Structural Reliability ◽  
Ground Motions ◽  
Soft Soil ◽  
Reinforced Concrete Buildings ◽  
Rc Buildings ◽  
Nsga Ii ◽  
Concrete Buildings ◽  
Buckling Restrained Braces

The control of vibrations and damage in traditional reinforced concrete (RC) buildings under earthquakes is a difficult task. It requires the use of innovative devices to enhance the seismic behavior of concrete buildings. In this paper, we design RC buildings with buckling restrained braces (BRBs) to achieve this objective. For this aim, three traditional RC framed structures with 3, 6, and 9 story levels are designed by using the well-known technique nondominated sorting genetic algorithm (NSGA-II) in order to reduce the cost and maximize the seismic performance. Then, equivalent RC buildings are designed but including buckling restrained braces. Both structural systems are subjected to several narrow-band ground motions recorded at soft soil sites of Mexico City scaled at different levels of intensities in terms of the spectral acceleration at first mode of vibration of the structure Sa(T1). Then, incremental dynamic analysis, seismic fragility, and structural reliability in terms of the maximum interstory drift are computed for all the buildings. For the three selected structures and the equivalent models with BRBs, it is concluded that the annual rate of exceedance is considerably reduced when BRBs are incorporated. For this reason, the structural reliability of the RC buildings with BRBs has a better behavior in comparison with the traditional reinforced concrete buildings. The use of BRBs is a good option to improve strength and seismic behavior and hence the structural reliability of RC buildings subjected to strong earthquake ground motions.

The Effects of Temporary Tower Cranes on the Construction Process and Seismic Behavior of Reinforced Concrete Buildings

2020 ◽  
Vol 24 (2) ◽  
pp. 580-595
Author(s):  
Eric Forcael ◽  
Guillermo Young ◽  
Alexander Opazo ◽  
Carlos Rodríguez ◽  
Arnaldo Bayona
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Construction Process ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings

scholarly journals Evaluation and considerations about fundamental periods of damaged reinforced concrete buildings

2013 ◽  
Vol 13 (7) ◽  
pp. 1903-1912 ◽  
Author(s):  
R. Ditommaso ◽  
M. Vona ◽  
M. R. Gallipoli ◽  
M. Mucciarelli
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Fundamental Period ◽  
L’Aquila Earthquake ◽  
Reinforced Concrete Buildings ◽  
Rc Buildings ◽  
Damage Level ◽  
Concrete Buildings ◽  
2009 L’Aquila Earthquake ◽  
Code Provisions

Abstract. The aim of this paper is an empirical estimation of the fundamental period of reinforced concrete buildings and its variation due to structural and non-structural damage. The 2009 L'Aquila earthquake has highlighted the mismatch between experimental data and code provisions value not only for undamaged buildings but also for the damaged ones. The 6 April 2009 L'Aquila earthquake provided the first opportunity in Italy to estimate the fundamental period of reinforced concrete (RC) buildings after a strong seismic sequence. A total of 68 buildings with different characteristics, such as age, height and damage level, have been investigated by performing ambient vibration measurements that provided their fundamental translational period. Four different damage levels were considered according with the definitions by EMS 98 (European Macroseismic Scale), trying to regroup the estimated fundamental periods versus building heights according to damage. The fundamental period of RC buildings estimated for low damage level is equal to the previous relationship obtained in Italy and Europe for undamaged buildings, well below code provisions. When damage levels are higher, the fundamental periods increase, but again with values much lower than those provided by codes. Finally, the authors suggest a possible update of the code formula for the simplified estimation of the fundamental period of vibration for existing RC buildings, taking into account also the inelastic behaviour.

scholarly journals Inelastic Seismic Response of RC Building with Control System

2011 ◽  
Vol 462-463 ◽  
pp. 241-246 ◽  
Author(s):  
Farzad Hejazi ◽  
Samira Jilani Kojouri ◽  
Jamal Noorzaei ◽  
M.S. Jaafar ◽  
W.A. Thanoon ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Analysis ◽  
Viscous Damper ◽  
Reinforced Concrete Buildings ◽  
Rc Buildings ◽  
Viscous Dampers ◽  
Earthquake Excitation ◽  
Finite Element Program ◽  
Concrete Buildings ◽  
Element Program

Conventional buildings are mainly designed based on elastic analysis of structures subjected to moderate earthquakes. In this case, the seismic forces are much smaller than the forces introduced by strong ground motions with the considered structural behavior going to nonlinear response during these severe earthquakes. Improving the earthquake resistance of reinforced concrete buildings using a variety of earthquake energy dissipation systems has received considerable attention in recent years by civil engineers. In the present study, a nonlinear computational scheme was developed to predict the complete nonlinear dynamic response of reinforced concrete framed buildings equipped with viscous damper device subjected to earthquake excitation. A finite element program code is developed based on the nonlinear analysis procedure of reinforced concrete buildings equipped with viscous damper devices and a two dimensional, five story models of RC buildings subjected to earthquake were analyzed. Result of nonlinear analysis of RC buildings which furnished by viscous dampers indicated that using of viscous dampers effectively reduced the damages occurring in the building and structural motion during severe earthquakes.

scholarly journals Structural damage aspects of the April 22, 1991 Costa Rica earthquake

1992 ◽  
Vol 25 (1) ◽  
pp. 17-36 ◽  
Author(s):  
M. J. Nigel Priestley
Keyword(s):  
Reinforced Concrete ◽  
Costa Rica ◽  
Structural Damage ◽  
Soft Soil ◽  
Highway Bridges ◽  
Reinforced Concrete Buildings ◽  
Soil Layers ◽  
Concrete Buildings ◽  
Epicentral Region

The magnitude M = 7.4 earthquake of April 22, 1991 occurred in a comparatively lightly inhabited region of Costa Rica. Despite dramatic geomorphological effects, including extensive landslides in the mountainous epicentral region, and uplift of the East Coastline by up to 1.5m, structural damage was comparatively light. A number of warehouses, and reinforced concrete buildings in or near the Port of Lim6n collapsed or were badly damaged, and a considerable number of houses supported on tall wooden piles failed. Of greatest interest was the failure of a number of modem highway bridges, due primarily to liquefaction of foundations, or excessive movement of soft soil layers in embankments.

scholarly journals BENEFIT FROM CHAINED MASONRY WALLS TO IMPROVE THE SEISMIC RESPONSE OF REINFORCED CONCRETE BUILDINGS

2021 ◽  
Vol 30 (2) ◽  
Author(s):  
Abdelkader Nour ◽  
Abdelkader Benanane ◽  
Humberto Varum
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Lateral Displacement ◽  
Response Spectrum ◽  
Masonry Walls ◽  
Base Shear ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Finite Element Software ◽  
Seismic Loadings

The multiple earthquakes have proved the effect of chained masonry walls on the seismic behavior of multistoried reinforced concrete buildings. The chained masonry walls have been considered one of the types of masonry infill walls but without gaps. This participation came intending to study this effect through the modeling of several two-dimensional frames for a multistoried reinforced concrete building, taking into account the hollow brick walls, which represent the most common type in Algeria. We analyzed the proposed models using ETABS finite element software, relying on the response spectrum method and respecting the most important requirements according to the applicable Algerian Seismic Code. After analysis of the different models, the results have been compared according to the parameters of the period, base shear, lateral displacement, and stiffness. Through a critical synthesis of the results, we concluded that these walls could significantly affect the seismic behavior of this type of buildings. Moreover, the neglect of these walls in the modeling process can lead designers to have a false perception of the behavior of these buildings towards seismic loadings.    

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