Strain Behavior of Penetrating Rebar in Perfobond Strip and Its Evaluation of Shear Resistance

Abstract

A perfobond strip is widely used as the validated shear connector in various steel-concrete hybrid structures. In general, the penetrating rebar is arranged in the perforation to suppress the brittle fracture of the perfobond strip due to the shear failure of the concrete at the perforation. However, the effect of the penetrating rebar on the shear resistance, and the effect of the perforation diameter, the penetrating rebar diameter, and the thickness of the steel plate on the behavior of the penetrating rebar have not been clarified until now. In this research, in order to investigate the effect of the penetrating rebar on the shear resistance of the perfobond strip, simple push-out tests were conducted paying attention to the relation between the perforation diameter and the penetrating rebar diameter, and the variations in the steel plate thickness. Furthermore, to obtain the shear contribution of the penetrating rebar to the shear resistance of the perfobond strip, a nonlinear numerical analysis was conducted. As a result, a design formula was constructed to evaluate the shear resistance of the perfobond strip with the penetrating rebar.

Evaluation of formulations for predicting the shear strength of concrete filled circular holes in steel plates

“…The other formulations presented higher scatter of the data even though in some cases [11], [16] the correction factor was close to one, as desired.…”

“…Observing the points referring to the experimental results of Xiao et al [12] in Figure 7, it is noted that for most formulations the results of the push-out (triangles) and plug-in (circles) tests laid vertically aligned in the diagrams, indicating that these formulations are unable to predict a strength increase as the depth of the connection increases. Only the formulation by Nakajima and Nguyen [11] was able to predict higher strength values for plug-in shear tests. The Oguejiofor and Hosain [7], [14]; Medberry and Sharooz [16] and Veríssimo [17] formulations showed the opposite trend, i.e., they incorrectly predicted higher strength for push-out tests.…”

“…Nakajima and Nguyen [11], conducted 34 plug-in shear tests in order to evaluate the influence of the transverse reinforcement in the CFH strength. The specimens varied in transverse rebar diameter, hole diameter, plate thickness and material properties.…”

“…Oguejiofor and Hosain [7], [14]; Hosaka et al [15]; Medberry and Shahrooz [16]; Veríssimo [17]; Al Darzi et al [18]; Ahn et al [19] and Zheng et al [13] derived regression analysis equations, evaluating the shear strength of CFH, obtained by means of push-out tests. He et al [10] and Nakajima and Nguyen [11] proposed analytical models based on plug-in tests results, Zhao and Liu [20] based their formulation both push-out and plug-in test results and Braun [21] proposed a formulation for the case of application of the CFH in composite slim floor beam (CoSFB). ( ) Notation: A is the hole area (mm 2 ); Ab is the area of the contact surface between the steel plate and the concrete (mm 2 ); Ac is the section area of the concrete dowel, Ac = π(d 2 -ds 2 )/4; Acc is the shear area of concrete per connector (mm 2 ), which is the longitudinal slab area minus the connector area; Al is the side area of the concrete block (mm 2 ); As is the section area of the transverse rebar in one hole (mm 2 );…”

“…Vδ b Hosaka et al [15] 0.2568 0.7769 Zhao and Liu [20] 0.2714 1.0125 He et al [10] 0.2838 1.0306 Braun [21] 0.3689 1.6258 Al-Darzi et al [18] 0.3701 0.8767 Ahn et al [19] 0.3705 2.0104 Nakajima and Nguyen [11] 0.3842 1.0407 Zheng et al [13] 0.4158 1.1943 Oguejiofor and Hosain [14] 0.4493 0.9028 Oguejiofor and Hosain [7] 0.4597 0.4483 Medberry and Shahrooz [16] 0.5056 1.0395 Veríssimo [17] 0.5359 0.6072 Braun [21] Al-Darzi et al [18] Ahn et al [19] Nakajima & Nguyen [11] Zheng et al [13] Oguejiofor & Hosain [14] Oguejiofor & Hosain [7] Medberry & Shahrooz [16] Veríssimo [17] Vd b Table 5. Formulations ranked by approximation of average slope of q × fc, d, t and ds curves in relation to the slope defined by experimental points.…”