P. Paramasivam’s research while affiliated with National University of Singapore and other places

... The structural behavior and design rules of perforated structural members have been extensively studied by many researchers. Experimental investigations were conducted by Yu and Davis (1973) for cold-formed steel compression members with perforated plate elements; Ritchie and Rhodes (1975) for simply supported uniformly compressed square and rectangular plates with central circular holes; Ortiz-Colberg (1981) for stiffened plates with circular perforations; Loov (1984) for cold-formed steel C-shaped studs with punched webs; Narayanan and Chow (1985) for thin shear loaded plates with square and circular holes; Shanmugam et al. (1985Shanmugam et al. ( , 1986 for axially compressed stiffened plates containing openings; Sivakumaran (1987) for uniformly compressed cold-formed steel sections with punched web; Sivakumaran and Zielonka (1989) for web crippling of C-shaped lipped channel sections with web openings; Shan et al. (1994) for local buckling flexural strength of webs with openings; Miller and Pekoz (1994) for cold-formed steel wall studs with rectangular web perforations; Rhodes and Schneider (1994) and Chung (1995) for web crippling of cold-formed sections with single and multiple web openings; Rhodes and Macdonald (1996) for compressed perforated plain channel sections; Abdel-Rahman (1997) for coldformed steel compression lipped channel sections with perforations; Pu et al. (1999) for symmetrically perforated lipped channels; Moen and Schafer (2008) for cold-formed steel lipped channel columns with prepunched slotted web holes; Acharya et al. (2013) for cold-formed steel joists with web opening in the shear zone. Furthermore, numerical investigations were performed by Dhanalakshmi and Shanmugam (2001) for perforated coldformed steel equal-angle stub columns; Satish Kumar and Prasada Rao (2006) for rectangular hollow section (RHS) beam-to-column connections with web opening; Uzzaman et al. (2012Uzzaman et al. ( , 2013 for web crippling behavior of cold-formed steel channel sections with offset web holes. ...

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Experimental Investigation of Aluminum Alloy Stub Columns with Circular Openings

... In conclusion, we can state that the apparatus designed and implemented for conducting direct tensile tests has been successfully proven, and machining waste (chips) can be effectively utilized by incorporating them into fiber concrete preparation for industrial flooring and shotcrete applications, particularly in tunnels and the repair of large-diameter pipelines (Casanova, 1995;Rossi, 1991;Bouafia et al., 2002;Rossi et al., 1989;Lim et al., 1987) Furthermore, this concrete can be employed to enhance the fire resistance of reinforced concrete, as the fibers would restrict crack openings and shield traditional reinforcements from thermal radiation. In perspective, it would be interesting to carry out tests on test specimens of real large dimensions, to carry out tests with flat fibers instead of wavy ones in order to reduce the voids (cavities) in the cement paste, and also to associate these fibers to traditional reinforcements. ...

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The Effect of Recovery Fibers and the Sand/Gravel Ratio on the Direct Tensile Behavior of Concrete

... Early attempts opted for a uniform residual tensile stress [33]. Later, a bilinear model was adopted and proved to fit the experimental data more accurately [34]. Rilem and the fib model code adopt such bilinear post-cracking tensile stress-strain relation to design FRC structures. ...

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Constitutive Relations for Modelling Macro Synthetic Fiber Reinforced Concrete

... From Fig. 4, it's evident that the contribution of uncracked shear-compression SFRC diminishes from 61 to 18% with λ increasing from 1.5 to 5.0, displaying minimal influence from changes in ρ. This aligns with the shift in shear failure, transitioning from shear-compression to diagonal tension even to flexure, predominantly dictated by the ratio of moment to shear force 47,55,74,85,89 . Consequently, the depth of the shear-compression zone decreases, leading to a reduction in its shear resistance 47,59,93 . ...

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Effectiveness evaluation of different steel fibers on the shear strength of reinforced SFRC slender beams without web rebars

... Several analytical and experimental studies have been carried out on the prediction of deflection of SFRC beams [9][10][11][12][13]. In addition, Alsayed [10] produced an experimental model that takes account of the volume fraction (V f ) and aspect ratio (ℓ f /d f ) of SFs to predict the flexural rigidity (EI) and deflection of RC beams. ...

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Experimental and numerical studyof the effectof stirrups and steel fibres on the shear capacity of reinforced concrete beams

... Experimental research is one of the most rigorous methods to analyse the mechanical behaviour of novel structures. Ultimate compressive experiments have been performed on various stiffened panels with openings, for example, Shanmugam et al. (1986); Paik (2007); Kim et al. (2009); Wang et al. (2009); Kumar et al. (2009aKumar et al. ( , 2009b; Saad-Eldeen et al. (2016, 2018 and Liu, Gao et al. (2021). Various types of openings were investigated, such as rectangular, circular and elongated-circular openings. ...

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Experimental and numerical analysis of the ultimate compressive strength of double-deck structures with a large opening