scholarly journals Seismic Performance Improvement of MDOF Reinforced Concrete Moment Frame Retrofitted Steel Jacket

2013 ◽  
Vol 13 (1) ◽  
pp. 69-77 ◽  
Author(s):  
Jun-Young Kim ◽  
In-Kju Jung ◽  
Soon-Eung Park
Keyword(s):  
Reinforced Concrete ◽  
Performance Improvement ◽  
Seismic Performance ◽  
Moment Frame ◽  
Steel Jacket

Seismic Strengthening of the Majestic Centre, Wellington, New Zealand

2020 ◽  
pp. 95-126
Author(s):  
Joe White ◽  
Hamish McKenzie
Keyword(s):  
Reinforced Concrete ◽  
New Zealand ◽  
Seismic Performance ◽  
Seismic Loading ◽  
Hollow Core ◽  
Seismic Strengthening ◽  
Moment Frame ◽  
Strengthening Exercise

<p>The Majestic Centre is a 30-storey office tower in the centre of Wellington, New Zealand. The structure has a dual lateral system (reinforced concrete (RC) moment frame + shear cores) and hollow-core floors. The building’s assessed seismic performance was found to be below expected levels, leading to a strengthening exercise. Over a period of 5 years, the structures performance was raised to meet current seismic loading requirements, at a cost of €50M.</p>

scholarly journals Experimental Research on Reinforced Concrete Columns Strengthened with Steel Jacket and Concrete Infill

2021 ◽  
Vol 11 (9) ◽  
pp. 4043
Author(s):  
Aleksandar Landović ◽  
Miroslav Bešević
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Experimental Research ◽  
Failure Modes ◽  
Steel Tube ◽  
Rc Columns ◽  
Rc Column ◽  
Steel Jacket ◽  
Ductile Behavior

Experimental research on axially compressed columns made from reinforced concrete (RC) and RC columns strengthened with a steel jacket and additional fill concrete is presented in this paper. A premade squared cross-section RC column was placed inside a steel tube, and then the space between the column and the tube was filled with additional concrete. A total of fourteen stub axially compressed columns, including nine strengthened specimens and five plain reinforced concrete specimens, were experimentally tested. The main parameter that was varied in the experiment was the compressive strength of the filler concrete. Three different concrete compression strength classes were used. Test results showed that all three cross-section parts (the core column, the fill, and the steel jacket) worked together in the force-carrying process through all load levels, even if only the basic RC column was loaded. The strengthened columns exhibited pronounced ductile behavior compared to the plain RC columns. The influence of the test parameters on the axial compressive strength was investigated. In addition, the specimen failure modes, strain development, and load vs. deformation relations were registered. The applicability of three different design codes to predict the axial bearing capacity of the strengthened columns was also investigated.

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