A novel seismic strengthening method of RC columns confined by direct fastening steel plates

2020 ◽  
Vol 218 ◽  
pp. 110838
Author(s):  
Z.W. Shan ◽  
D.T.W. Looi ◽  
R.K.L. Su
Keyword(s):  
Steel Plates ◽  
Seismic Strengthening ◽  
Rc Columns ◽  
Strengthening Method

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.

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 Mechanical Behavior of RC Columns Damaged by Alkali-Silica Reaction and Proposal of Strengthening Method.

2002 ◽  
pp. 129-142
Author(s):  
Mitsuyasu IWANAMI ◽  
Hiroshi YOKOTA ◽  
Kazutoshi OKUYAMA ◽  
Kazuyuki TORII
Keyword(s):  
Mechanical Behavior ◽  
Alkali Silica Reaction ◽  
Rc Columns ◽  
Strengthening Method

Seismic Behaviour on Composite Strengthening for Existing Reinforced Concrete Short Columns

2011 ◽  
Vol 194-196 ◽  
pp. 1986-1989
Author(s):  
Gen Tian Zhao
Keyword(s):  
Shear Failure ◽  
Experimental Studies ◽  
Steel Plates ◽  
Shear Mode ◽  
Seismic Behaviour ◽  
Shear Strengthening ◽  
Moment Capacity ◽  
Short Column ◽  
Short Columns ◽  
Strengthening Method

In order to develop an effective seismic shear strengthening method for improving the earthquake behavior of existing R/C short columns, experimental studies are conducted by using four beam-column sub assemblage specimens with a short column. Three short columns of these specimens are strengthening by steel plates and concrete, while other one is without any steel plate strengthening. All the specimens are tested under a constant gravity load and alternately repeated lateral forces. Test results demonstrate that, if the short column is strengthened by a welded square tube and concrete, then brittle shear failure does not occur and the column can develop its ultimate flexural moment capacity. It is also shown by tests that the proposed strengthening method using steel plates and concrete is applicable to repair and rehabilitate the damaged short columns failed in the brittle shear mode.

Seismic Strengthening on Masonry Structure of Primary and Secondary School Buildings

2011 ◽  
Vol 71-78 ◽  
pp. 626-630
Author(s):  
Xue Feng Zhou ◽  
Xiang Chen
Keyword(s):  
Secondary School ◽  
School Buildings ◽  
Seismic Strengthening ◽  
Project Proposal ◽  
Security Risks ◽  
Quality Detection ◽  
Site Survey ◽  
Earthquake Resistant ◽  
Strengthening Method ◽  
Primary And Secondary School

It is an important issue for engineers and technicians that how to conduct safe identification and earthquake resistant strengthening of the primary and secondary school buildings after Wenchuan earthquake. The paper comprehensively reviewed aspects of quality detection, safety identification and strengthening design of the primary and secondary school buildings in Xi’an district. To address existed security risks, construction progress, construction complexity and period were comprehensively considered to choose corresponding seismic strengthening method based on seismic qualification and site survey. Project proposal was given according to problems in the design, which provides reference to design and construction of following similar projects.

Seismic Strengthening Design and Construction of Rocking Piers of a Road Bridge

2019 ◽  
Author(s):  
Osamu Sanada ◽  
Yasuto Takahashi ◽  
Nobuhiro Shibano ◽  
Kazunari Akizawa ◽  
Yao Luan
Keyword(s):  
Nonlinear Dynamic Analysis ◽  
Side Surface ◽  
Steel Plates ◽  
Seismic Strengthening ◽  
Cross Section Area ◽  
Starting Point ◽  
Bending Capacity ◽  
Pile Caps ◽  
Short Time ◽  
Design And Construction

<p>On April 14, 2016, an earthquake of magnitude 7.3 hit in Kumamoto Prefecture, Japan. 12 bridges were damaged and could not be restored in a short time, significantly impacting the transportation of relief supplies through emergency roads to the disaster areas. Among them, an expressway bridge supported by rocking piers collapsed, which had never occurred in past earthquakes. The collapse was caused by the failure of restraint details on an abutment. The rocking piers, however, failed to prevent the superstructure from falling subsequently, because the pier joints with the girders and pile caps were all hinges that provided no restraint to superstructure. With this collapse as a starting point, seismic strengthening of bridges with rocking piers has started being implemented all over Japan. The authors’ company launched a strengthening project in July 2017. Among the expressways under our management, the Tomei Expressway has the largest traffic volume. Any bridge falling of the expressway may cause enormous damage. This paper presents a strengthening design and construction of a bridge in the Tomei Expressway for ist rocking piers. The rocking piers were strengthened by installing braces between each two neighboring piers. In addition, based on a nonlinear dynamic analysis, the pile caps under the piers were strengthened by thickening the cross section area and rigidizing their joints with the piers using reinforced concrete, in order to provide sufficient shear and bending capacity. The pivot bearings of the piers that support the girders were also strengthened, by installing restrainers and side surface steel plates. The strengthening construction was started in August 2018 and completed in March 2019.</p>

Seismic Strengthening of Primary and Secondary Schools in the Region of High Seismic Intensity

2011 ◽  
Vol 71-78 ◽  
pp. 1379-1382
Author(s):  
Wei Hou ◽  
Xue Feng Zhou ◽  
Xiang Chen
Keyword(s):  
Secondary School ◽  
Seismic Intensity ◽  
Project Design ◽  
School Buildings ◽  
Seismic Strengthening ◽  
Construction Period ◽  
Quality Detection ◽  
Earthquake Resistant ◽  
Strengthening Method ◽  
Primary And Secondary School

An important issue our engineers and technicians met is that how to do safe identification and earthquake resistant strengthening of the primary and secondary school buildings after WenChuan earthquake. The paper reviewed entirely the quality detection, identification and strengthening design of the primary and secondary school buildings in Xi'an. In this paper, the influences of the construction progress, complexity and construction period are all taken into account in order to choose the corresponding seismic strengthening method which are based on the seismic qualification and on-the-spot survey. Problems existed in project design are presented in this paper, which can be taken for example on similar engineering.

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