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The presence of CFRPs was expected to improve the joint confinement and to avoid the failure of the CFRP anchors (Ozbakkaloglu and Saatcioglu 2009; Brena and McGuirk 2013).
Past earthquakes showed that, for these buildings, shear failure in beam column joints can lead to structural collapse mainly due to the inadequate joint confinement.
All test specimens included (with at least a minimum amount of joint transverse reinforcement necessary for proper joint confinement) were subjected to cyclic lateral loading, and had no out-of-plane members (transverse beams or slabs).
This strength enhancement is a function of the degree of joint confinement provided by the surrounding slab, and even corner slab-column connections showed some degree of strength enhancement.
UNICEF also recommends abolishing the practice of joint confinement of children with adults.
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It also delays the crack initiation at the joint through confinement due to FRP reinforcement.
The effect on column slab joint strength of confinement by rectangular hoops and slab portions extending in all directions from the joint are investigated.
As shown in the figure, in the negative direction, the retrofitted specimen J-H exhibited higher stiffness than that of the control specimen J-0; this was attributed to the enlargement of the joints and the enhanced concrete confinement in the joints by using the steel haunch elements.
As the PL signal from PS has been attributed to the joint contribution of quantum confinement and the surface states [12], dominant PL contribution can be attributed to the microporous film (pore dimension <2 nm) prevailing on the entire PS surface (at the top of the macropores) including the walls of the macropores as well.
The variation of reinforcement details, confinement and joints angle are considerable factors which affect the ultimate limit moment of joints and joints efficiency.
Reconnaissance reports on structures damaged or collapsed by severe earthquakes have revealed several common characteristics in their structural members and systems, such as insufficient reinforcement details in beam-column joints and transverse confinements, low aspect ratios, soft and or weak stories, and eccentric plans.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com