In this study, the performance of prestressed reinforced self-consolidating concrete (SCC) slabs strengthened with carbon fiber-reinforced polymer (CFRP) sheets has been investigated experimentally and numerically. Effects of prestressing force and number of CFRP sheets on the force–deflection curve, cracking behavior, and energy absorption have been studied. The increase in the prestressing force increased the flexural strength and reduced the crack width; however, it led to a slight reduction in the energy absorption due to reduced deformation. The strengthening of the slab section with one layer of CFRP enhanced the flexural strength and energy absorption by about 30% and 71%, respectively, and reduced the crack width by 23% over that of the control specimen. Applying two layers of CFRP did not enhance the flexural capacity significantly; however, it prevented the CFRP rupture in the transverse direction. Prestressing force reduced the tensile strains in the whole section; however, CFRP-strengthening reduced the concrete tensile strain at the interface between concrete and CFRP sheet. The CFRP-strengthening technique was more effective than increasing the prestressing force in enhancing the performance of reinforced SCC slabs. Furthermore, the results of the parametric study performed on the numerical model of the slabs showed that increasing the eccentricity ratio increased the load bearing capacity by up to 80%, while the effect of concrete compressive strength and applying more than two CFRP layers was insignificant. The findings of the present research showed that combined application of prestressing and using one layer of CFRP sheet can increase the load bearing capacity and ductility of reinforced SCC slabs significantly. Also, combining the prestressing and CFRP-strengthening techniques delayed the debonding of the CFRP layer from the concrete due to reduced cracking and tensile strain.

在这项研究中，已对碳纤维增强聚合物（CFRP）板增强的预应力增强自固结混凝土（SCC）板的性能进行了实验和数值研究。研究了预应力和CFRP板数对力-挠度曲线，开裂行为和能量吸收的影响。预应力的增加增加了弯曲强度，减小了裂缝宽度。但是，由于变形减少，导致能量吸收略有减少。用一层CFRP加固平板截面分别使抗弯强度和能量吸收分别提高了约30％和71％，并且裂缝宽度比对照样品降低了23％。施加两层CFRP不能显着增强挠曲能力。但是，它防止了CFRP在横向方向上破裂。预应力减小了整个截面的拉伸应变。但是，CFRP加固降低了混凝土与CFRP板之间界面处的混凝土拉伸应变。CFRP加固技术在增强SCC增强平板性能方面比增加预应力更为有效。此外，对板的数值模型进行的参数研究结果表明，增加偏心率可将承载能力提高多达80％，而混凝土抗压强度和施加两层以上CFRP层的影响并不明显。本研究结果表明，预应力的联合应用和使用一层CFRP板可以显着提高钢筋混凝土SCC板的承载能力和延性。而且，由于减少了开裂和拉伸应变，预应力和CFRP加固技术的结合延迟了CFRP层与混凝土的剥离。