Issue 78

D. D. Joshi et alii, Fracture and Structural Integrity, 78 (2026) 315-345; DOI: 10.3221/IGF-ESIS.78-19

measures adopted to enhance the progressive collapse performance of RC structures is presented in Fig. 3. Several important parameters of the selected experimental studies related to strengthening of reinforced concrete systems are summarized in Tab. 2, whereas Tab. 3 presents key observations from these studies, including the main findings, limitations and failure modes.

Figure 3: Strengthening techniques for progressive collapse mitigation of RC structures

Specimen scale and Column removal scenario One-third scale

Author / Nature of study

Strengthening material

Structural system

Strengthening configuration

Loading protocol

Bao et al. [11] Experimental

Beam column assembly (Two bays frame)

BFRP sheets

Two different BFRP sheets configuration around the beam-column joint region in addition to longitudinal BFRP strips at beam soffit L shape CFRP strips at corner, U shaped wraps to the beam end, strip from the bottom, wraps on the column, continuous strip at the beam Wrapping of CFRP around the beam-column junction

Quasi-static load (5 to 10 mm/min)

Middle column

Liang et al. [12] Experimental and analytical Li et al. [13] Experimental and numerical

Beam-column assembly with extended beam (Two bays frame)

One-half scale Penultimate and edge column

CFRP strips and wraps

Quasi-static loading (0.5 mm/min)

four-bay x two story frame

One-third scale Middle

CFRP wraps

Quasi-static loading

column from ground storey

Qian and Li [14] Experimental and numerical

Beam-column slab sub assembly (One bays frame)

One-third scale

CFRP laminates

Orthogonally and diagonally oriented CFRP laminates, L strip at corner, CFRP strip wrapped around the column

Quasi-static loading

Corner column

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