Simplified material models for post-fire seismic performance of RC columns: Does the confinement model matter?

2021 ◽  
Author(s):  
Ioanna Ioannou ◽  
David Rush ◽  
Tiziana Rossetto
Keyword(s):  
Seismic Performance ◽  
Material Models ◽  
Rc Columns ◽  
Confinement Model

Analysis of Seismic Performance of RC Frames with Centrally Reinforced Columns

2013 ◽  
Vol 671-674 ◽  
pp. 1319-1323
Author(s):  
Zi Xue Lei ◽  
Yu Hang Han ◽  
San Sheng Dong ◽  
Jun Qing Guo
Keyword(s):  
Seismic Performance ◽  
Cross Sections ◽  
Carrying Capacity ◽  
Pushover Analysis ◽  
Seismic Load ◽  
Load Carrying Capacity ◽  
Rc Columns ◽  
Rc Column ◽  
Rc Frames ◽  
Load Carrying

A centrally reinforced column is a new type of RC columns, formed by providing a reinforcement skeleton at the central part of the cross section of an ordinary RC column. Tests have shown that as compared with an ordinary RC column, this type of columns has a higher load carrying capacity and ductility. From the pushover analysis of a frame composed of ordinary RC columns and one consisting of centrally reinforced columns, their seismic performance under seismic load of 9-degree intensity was studied according to Chinese code, including target displacements, story-level displacements, interstory drifts, appearance and development of plastic hinges. The results indicate that although the dimensions of cross sections of columns in the frame with centrally reinforced columns are smaller than those of the ordinary frame, the former still has a higher overall load carrying capacity and seismic performance than the latter.

Seismic Performance of CFRP Jacketed Sub-standard RC Columns Under High Axial Stress and Shear Demand

2021 ◽  
pp. 1278-1290
Author(s):  
Merve Nur Demir ◽  
Ugur Demir ◽  
Cem Demir ◽  
Alper Ilki
Keyword(s):  
Seismic Performance ◽  
Axial Stress ◽  
Rc Columns ◽  
Shear Demand

scholarly journals Seismic performance assessment of RC columns with interlocking hoops

2021 ◽  
Author(s):  
Tae-Hoon Kim
Keyword(s):  
Reinforced Concrete ◽  
Performance Assessment ◽  
Seismic Performance ◽  
Evaluation System ◽  
Damage Index ◽  
Seismic Performance Assessment ◽  
Rc Columns ◽  
Rc Structures ◽  
Damage Indices ◽  
Transverse Steel

The aim of this study is to analytically assess the seismic performance of reinforced concrete (RC) columns with interlocking hoops using a novel damage index, and to provide data for developing next generation seismic design criteria. Seismic performance of RC columns is controlled by the level of confinement provided by transverse steel. Interlocking hoops are commonly used in RC columns because they can provide more effective confinement than rectangular hoops. Three RC interlocking columns were tested under a constant axial load and a cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), is used to analyze RC structures. Novel damage indices aim to provide a means of quantifying numerically the performance level in RC columns with interlocking hoops sustained under earthquake loading. The proposed numerical method for the seismic performance assessment of interlocking columns is verified by comparison with the experimental results.

Seismic Performance of Large Rupture Strain (LRS) FRP-Wrapped Circular RC Columns

2021 ◽  
pp. 1914-1922
Author(s):  
Yu-Feng Zhang ◽  
Yu-Lei Bai ◽  
Peng-Xuan Sun ◽  
Jian-Guo Dai
Keyword(s):  
Seismic Performance ◽  
Rc Columns ◽  
Rupture Strain

scholarly journals Cyclic Performance of RC Columns with Inadequate Lap Splices Strengthened with CFRP Jackets

Fibers ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 39
Author(s):  
George Kalogeropoulos ◽  
Alexander-Dimitrios Tsonos
Keyword(s):  
Seismic Performance ◽  
Shear Capacity ◽  
Design Parameters ◽  
Cyclic Performance ◽  
Rc Columns ◽  
Lap Splices ◽  
Lap Splice ◽  
Reinforced Polymer ◽  
Lateral Displacements ◽  
Ultimate Shear Capacity

The cyclic performance of non-seismically designed reinforced concrete (RC) columns, strengthened with carbon fiber reinforced polymer (CFRP) jackets, was analytically and experimentally investigated herein. Three cantilever column specimens were constructed, incorporating design parameters of the period 1950s–1970s, namely with concrete of a low compressive strength, plain steel bars, widely-spaced ties and inadequate lap splices of reinforcement. The specimens were strengthened using CFRP jackets and were subsequently subjected to cyclic inelastic lateral displacements. The main parameters examined were the length of the lap splices, the acceptable relative bar slipping value and the width of the jackets. The hysteresis behaviors of the enhanced columns were compared, while also being evaluated with respect to those of two original columns and to the seismic performance of a control specimen with continuous reinforcement, tested in a previous work. An analytical formulation was proposed for accurately predicting the seismic responses of the column specimens, comparing the actual shear stress value with the ultimate shear capacity of the concrete in the lap splice region. The test results verified the predictions of the analytical model, regarding the seismic performance of the strengthened columns. Moreover, the influences of the examined parameters in securing the ductile hysteresis performance were evaluated.

scholarly journals EFFECT OF SIDE WALLS ON SEISMIC PERFORMANCE OF OLD RC COLUMNS

2008 ◽  
Vol 73 (633) ◽  
pp. 2001-2008
Author(s):  
Hongri JIN ◽  
Manabu YOSHIMURA ◽  
Takaya NAKAMURA ◽  
Kazuaki HOKI
Keyword(s):  
Seismic Performance ◽  
Rc Columns ◽  
Side Walls
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