Seismic Repair and Strengthening of a Severely Damaged Concrete Frame

Stoppenhagen, Dan R.; Jirs, James O.; Wyllie, Loring A.

doi:10.14359/1157

Cited by 10 publications

(2 citation statements)

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“…Techniques generally applied for retrofitting include the addition of extra concrete, either normal concrete or ultra-high performance concrete, to damaged RC members (Júlio et al. , 2003; Rodriguez and Park, 1991; Stoppenhagen et al. , 1995; Thermou and Elnashai, 2006; Zhang et al.…”

Section: Introductionmentioning

confidence: 99%

“…Techniques generally applied for retrofitting include the addition of extra concrete, either normal concrete or ultra-high performance concrete, to damaged RC members (J ulio et al, 2003;Rodriguez and Park, 1991;Stoppenhagen et al, 1995;Thermou and Elnashai, 2006;Zhang et al, 2019;Zhu et al, 2020); providing external reinforcements: near surface mounted (NSM) bars (Abdzaid and Kamonna, 2019;ACI Committee 440, 2017;Asplund, 1949;Hawileh, 2012;Razaqpur et al, 2011;Thermou and Elnashai, 2006;Wu et al, 2014); steel angles (Mondal, 2019;Thermou and Elnashai, 2006); plates of steel and fiber reinforced polymers (FRPs) (Al-Tamimi et al, 2011;L'Hermite and Bresson, 1967;Mondal, 2019;Sevuk and Arslan, 2005;Thermou and Elnashai, 2006); or utilizing FRP sheets of either carbon or glass or basalt (Arowojolu et al, 2017;Cervantes et al, 2014;Chahrour and Soudki, 2005;Duic et al, 2018;Franco et al, 2020;Ombres and Verre, 2019;Pohoryles et al, 2019). All of them proved to increase the strength and confinement of the structure.…”

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Simulation of reinforced concrete beam retrofitted with steel angles subjected to flexure

Shakib

Morshed

Kholil

et al. 2022

MMMS

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PurposeThe study focused on improving stiffness and premature failure, the weaknesses of the other retrofitting techniques and the retrofitted beam. A detailed study regarding the section properties and effective length of the angles was also carried out in this study.Design/methodology/approachIn this article, a comprehensive study was carried out using a finite element method to investigate the behavior and performance of steel angles as a retrofitting technique subjected to flexure. A model was developed in ABAQUS and validated with the available experimental works. The model was then applied to examine the beams retrofitted with the steel angles.FindingsFrom the investigation, the strengthening technique successfully enhanced the flexural capacity and stiffness of the beam. The stiffness of the retrofitted beam achieved more than 2.5 times of the controlled beam. The thickness and flange width of the angles improved both the load capacity and stiffness whereas, web width, having same flange width, improved the stiffness only. This study also illustrates that a premature failure can be minimized by maintaining L/S (length to span) ratio between 0.7 and 1.0 along with the welding to provide the connections between the angles and stirrups.Practical implicationsThe developed model and the findings can be used for designing the retrofitting technique for the damaged as well as beams to be increased their capacity.Originality/valueThe research focused on the implication of a new technique of retrofitting, steel angles to improve the stiffness of beam, which is one of the major drawbacks of traditional techniques. Moreover, the research aimed to improve premature failure by bonding the retrofitting materials with the stirrups of the mother beam through welding.

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