An analytical study of residual displacements in RC bridge columns subjected to near-fault earthquakes

2012 ◽  
Vol 8 (1) ◽  
pp. 35-45 ◽  
Author(s):  
M. Saiid Saiidi ◽  
S.M. Seyed Ardakani
Keyword(s):  
Analytical Study ◽  
Bridge Columns ◽  
Near Fault ◽  
Residual Displacements ◽  
Near Fault Earthquakes ◽  
Rc Bridge Columns

Research on the influencing factors for residual displacements of RC bridge columns subjected to earthquake loading

2016 ◽  
Vol 14 (8) ◽  
pp. 2229-2257 ◽  
Author(s):  
Hu Cheng ◽  
Hongnan Li ◽  
Dongsheng Wang ◽  
Zhiguo Sun ◽  
Guiqian Li ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Bridge Columns ◽  
Earthquake Loading ◽  
Residual Displacements ◽  
Rc Bridge Columns

scholarly journals Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings

2020 ◽  
Vol 11 (1) ◽  
pp. 82
Author(s):  
Fabio Mazza ◽  
Mirko Mazza
Keyword(s):  
Base Isolation ◽  
Nonlinear Models ◽  
Vertical Component ◽  
Computer Code ◽  
Nonlinear Phenomena ◽  
Isolation System ◽  
Elastomeric Bearings ◽  
Near Fault ◽  
Base Isolation System ◽  
Near Fault Earthquakes

Elastomeric bearings are commonly used in base-isolation systems to protect the structures from earthquake damages. Their design is usually developed by using nonlinear models where only the effects of shear and compressive loads are considered, but uncertainties still remain about consequences of the tensile loads produced by severe earthquakes like the near-fault ones. The present work aims to highlight the relapses of tension on the response of bearings and superstructure. To this end, three-, seven- and ten-storey r.c. framed buildings are designed in line with the current Italian seismic code, with a base-isolation system constituted of High-Damping-Rubber Bearings (HDRBs) designed for three values of the ratio between the vertical and horizontal stiffnesses. Experimental and analytical results available in literature are used to propose a unified nonlinear model of the HDRBs, including cavitation and post-cavitation of the elastomer. Nonlinear incremental dynamic analyses of the test structures are carried out using a homemade computer code, where other models of HDRBs considering only some nonlinear phenomena are implemented. Near-fault earthquakes with comparable horizontal and vertical components, prevailing horizontal component and prevailing vertical component are considered as seismic input. Numerical results highlight that a precautionary estimation of response parameters of the HDRBs is attained referring to the proposed model, while its effects on the nonlinear response of the superstructure are less conservative.

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.

Displacement-based design of RC bridge columns in seismic regions

1995 ◽  
Vol 24 (12) ◽  
pp. 1623-1643 ◽  
Author(s):  
Mervyn J. Kowalsky ◽  
M. J. Nigel Priestley ◽  
Gregory A. MacRae
Keyword(s):  
Bridge Columns ◽  
Seismic Regions ◽  
Displacement Based ◽  
Rc Bridge Columns

Seismic performance of circular hollow RC bridge columns

2014 ◽  
Vol 19 (5) ◽  
pp. 1456-1467 ◽  
Author(s):  
Jae-Hoon Lee ◽  
Jin-Ho Choi ◽  
Do-Kyu Hwang ◽  
Im-Jong Kwahk
Keyword(s):  
Seismic Performance ◽  
Bridge Columns ◽  
Rc Bridge Columns
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