PSI - Issue 64

Asad-ur-Rehman Khan et al. / Procedia Structural Integrity 64 (2024) 1065–1072 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Details of the internal reinforcement used in the beams are presented in Figure 1. Shear span is represented by distance " a " as described in Table 1.

Figure 1: Longitudinal and transverse reinforcement for all the control and strengthened beams

Table 1: Nomenclature and details of distance w.r.t a/d ratios Shear Span/depth ratio (a/d) ID for Control Beams ID for corresponding Strengthened Beams

Shear Span from near support ( a )

Length of TRM Wrap in shear ( 2a )

Length of TRM Flexural strip ( 2a+e )

1 2

CT1 CT2

TRM1 TRM2 TRM2.5

406 812

812 1624 2032

2945 3148 3250

2.5

CT2.5

1016

The location of U-shaped TRM wraps applied was from the left support up to a length ‘2 a ’ , covering a distance ‘ a ’ on either side of the applied load, resulting in obtaining the full span of the shear wrap equal to double the shear span. For flexure, the length of the TRM strip was decided based on an assumption that TRM application may increase the moment capacity up to double the value of original moment capacity of unstrengthened beam. If that length is more than ‘ 2a ’, then the flexural strip is extended to a distance ‘ e ’ beyond ‘ 2a ’, thereby, making the length of flexural strip as ‘ 2a+e ’ (Figure 2). The description of the lengths of TRM provided for shear and flexural strengthening is provided in Table 1 and shown in Figure 3.

Figure 2: Calculation of length of flexural TRM strip for strengthened beams

Figure 3: Details of beams strengthened with basalt fibre based TRM