scholarly journals FLEXURAL STRENGTH OF THE STRENGTH-DUCTILITY TYPE SEISMIC RETROFIT TECHNIQUE OF RC COLUMNS USING PC BAR PRESTRESSING AND STEEL PLATES

2020 ◽  
Vol 85 (767) ◽  
pp. 97-104 ◽  
Author(s):  
Kozo NAKADA ◽  
Tetsuo YAMAKAWA ◽  
Pasha JAVADI ◽  
Mohammad Zahid NOORI ◽  
Kazuo KANEDA
Keyword(s):  
Flexural Strength ◽  
Seismic Retrofit ◽  
Steel Plates ◽  
Rc Columns

scholarly journals Strengthening Design of RC Columns with Direct Fastening Steel Jackets

2021 ◽  
Vol 11 (8) ◽  
pp. 3649
Author(s):  
Zhiwei Shan ◽  
Lijie Chen ◽  
Kun Liang ◽  
Ray Kai Leung Su ◽  
Zhao-Dong Xu
Keyword(s):  
Flexural Strength ◽  
Load Capacity ◽  
Design Procedure ◽  
Load Ratio ◽  
High Strength ◽  
Lateral Load ◽  
Steel Plates ◽  
Flexural Stiffness ◽  
Rc Columns ◽  
Strengthening Method

For non-seismically designed columns with insufficient strength and flexural stiffness, intense inter-story drift can be incurred during a strong earthquake event, potentially leading to the collapse of the entire building. Existing strengthening methods mainly focus on enhancing axial or flexural strength but not the flexural stiffness of columns. In response, a novel direct fastening steel jackets that can increase both flexural strength and stiffness is introduced. This novel strengthening method features straightforward installation and swift strengthening as direct fastening is used to connect steel plates together to form a steel jacketed column. This new connection method can quickly and stably connect two steel components together by driving high strength fasteners into them. In this paper, the design procedure of RC columns strengthened with this novel strengthening method is originally proposed, which includes five steps: (1) estimating lateral load capacity of damaged RC columns; (2) determining connection spacing of steel jacket; (3) estimating the lateral load capacity of strengthened RC column; (4) evaluating the axial load ratio (ALR) of strengthened RC columns; and (5) estimating effective stiffness of strengthened RC columns. Lastly, an example is presented to illustrate the application of the proposed design procedure.

Retrofit of Artificially Perforated Shear Wall in Existing Dominant Wall Structure

2007 ◽  
Vol 348-349 ◽  
pp. 917-920
Author(s):  
Chang Sik Choi ◽  
Yun Cheul Choi ◽  
Hyun Ki Choi ◽  
M.S. Lee
Keyword(s):  
Carbon Fiber ◽  
Axial Stress ◽  
Shear Wall ◽  
Seismic Retrofit ◽  
Lateral Loading ◽  
The Other ◽  
Steel Plates ◽  
Wall Structure ◽  
Test Results ◽  
Different Types

A series of three shear wall specimens were tested under constant axial stress and reversed cyclical lateral loading in order to evaluate the seismic retrofit that had been proposed for the shear wall with the opening induced by remodeling. One of these specimens was tested in the as-built condition and the other two were retrofitted prior to testing. The retrofit involved the use of carbon fiber sheets and steel plates (a thickness of 3mm) over the entire face of the wall. The test results showed that the failed specimens had shear fractures and that two different types of retrofitting strategies had different effects on the strengths of each specimen.

scholarly journals Seismic retrofit for RC columns by NiTi and NiTiNb SMA wires

2009 ◽  
Author(s):  
E. Choi ◽  
K. T. Yang ◽  
G. H. Tae ◽  
T. H. Nam ◽  
Y. S. Chung
Keyword(s):  
Seismic Retrofit ◽  
Rc Columns

VULNERABILITY ASSESSMENT OF SEISMIC RETROFIT MEASURES FOR FRAME AND WALL PRE-CODE BUILDINGS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Aman Mwafy ◽  
Anas Issa
Keyword(s):  
Positive Impact ◽  
Seismic Retrofit ◽  
Steel Plates ◽  
Fiber Reinforced Polymers ◽  
Earthquake Scenarios ◽  
Building Inventory ◽  
Lateral Capacity ◽  
Earthquake Losses ◽  
Wide Range ◽  
Before And After

The number of existing buildings that may be at risk because of insufficient seismic design provisions cannot be underestimated. Recent studies have confirmed the pressing need for the seismic retrofit of pre-code structures to reduce their probability of collapse. A number of retrofit approaches are therefore assessed in this study, namely reinforced concrete jacketing, fiber reinforced polymers wrapping, and installing externally unbonded steel plates. Detailed structural design and fiber-based modeling are carried out for five reference structures representing frame and shear wall multi-story buildings before and after retrofit. Forty earthquake records are selected to represent potential earthquake scenarios in a region of medium seismicity that was selected as a reference study area. A large number of inelastic pushover and dynamic analyses are performed to assess the lateral capacity and to derive a wide range of fragility relationships for the reference structures. The highest positive impact of retrofit is observed on the pre-code flat slab-column systems. The reductions in the vulnerability of the retrofitted structures confirmed the effectiveness of the selected techniques for mitigating the earthquake losses of pre-code building inventory.

Seismic Retrofit of RC Columns with Continuous Carbon Fiber Jackets

1997 ◽  
Vol 1 (2) ◽  
pp. 52-62 ◽  
Author(s):  
Frieder Seible ◽  
M. J. Nigel Priestley ◽  
Gilbert A. Hegemier ◽  
Donato Innamorato
Keyword(s):  
Carbon Fiber ◽  
Seismic Retrofit ◽  
Rc Columns ◽  
Continuous Carbon Fiber
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