New rocking column with control of negative stiffness displacement range and its application to RC frames

2020 ◽  
Vol 206 ◽  
pp. 110133 ◽  
Author(s):  
G. Ríos-García ◽  
A. Benavent-Climent
Keyword(s):  
Negative Stiffness ◽  
Rc Frames ◽  
Rocking Column

Concentrated plasticity modelling of RC frames in time-history analyses

2021 ◽  
Vol 243 ◽  
pp. 112716
Author(s):  
Eleonora Bruschi ◽  
Paolo M. Calvi ◽  
Virginio Quaglini
Keyword(s):  
Time History ◽  
Rc Frames

Influence of the column-to-beam flexural strength ratio on the failure mode of beam-column connections in RC frames

2021 ◽  
Vol 20 (2) ◽  
pp. 441-452
Author(s):  
Gong Maosheng ◽  
Zuo Zhanxuan ◽  
Sun Jing ◽  
He Riteng ◽  
Zhao Yinan
Keyword(s):  
Flexural Strength ◽  
Failure Mode ◽  
Strength Ratio ◽  
Rc Frames

scholarly journals Seismic Response of RC Frames with a Soft First Story Retrofitted with Hysteretic Dampers under Near-Fault Earthquakes

2021 ◽  
Vol 11 (3) ◽  
pp. 1290
Author(s):  
Santiago Mota-Páez ◽  
David Escolano-Margarit ◽  
Amadeo Benavent-Climent
Keyword(s):  
Cost Effective ◽  
Far Field ◽  
Soft Story ◽  
Near Fault ◽  
Rc Frames ◽  
Story Drift ◽  
Number Of Cycles ◽  
Rc Frame Structures ◽  
Near Fault Earthquakes ◽  
Hysteretic Dampers

Reinforced concrete (RC) frame structures with open first stories and masonry infill walls at the upper stories are very common in seismic areas. Under strong earthquakes, most of the energy dissipation demand imposed by the earthquake concentrates in the first story, and this eventually leads the building to collapse. A very efficient and cost-effective solution for the seismic upgrading of this type of structure consists of installing hysteretic dampers in the first story. This paper investigates the response of RC soft-story frames retrofitted with hysteretic dampers subjected to near-fault ground motions in terms of maximum displacements and lateral seismic forces and compares them with those obtained by far-field earthquakes. It is found that for similar levels of total seismic input energy, the maximum displacements in the first story caused by near-fault earthquakes are about 1.3 times larger than those under far-field earthquakes, while the maximum inter-story drift in the upper stories and the distribution and values of the lateral forces are scarcely affected. It is concluded that the maximum displacements can be easily predicted from the energy balance of the structure by using appropriate values for the parameter that reflects the influence of the impulsivity of the ground motion: the so-called equivalent number of cycles.

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