Closure to 'Punching Shear Strengthening of Reinforced Concrete Flat Plates Using Carbon Fiber Reinforced Polymers' by Baris Binici and Oguzhan Bayrak

摘要

The writers thank the discussers for their contribution and for highlighting the oversight on the writers' part for failing to refer to their work (Sissakis 2000). It is important to recognize-that at the time our original paper was prepared and submitted for publication, Sissakis (2002) was not published. We are also glad to have this opportunity to clarify the differences between their work and the results reported in our original paper. Although the differences are not limited to the issues discussed below, the writers consider the following to be significant: Geometric Properties: The discussers indicate that their specimens were 59 X 59 X 6 in. whereas the specimens tested in our research measured 84 X 84 X 6 in. These dimensions indicate a difference of about 45 percent in the shear span-to-depth ratio. This significant difference is also reflected in the moment-shear ratios calculated at the critical perimeter for both bending axes. The different loading plate sizes used by the discussers (8 in.) and the writers (12 in.) result in significantly different b_o/d ratios in the two test series. An examination of Sissakis (2002) indicates that the discussers used two flexural reinforcement ratios: 1.49 and 2.23 percent. The flexural reinforcement ratio used in our tests was kept constant at 1.76 percent. CEB-FIP MC 90 (1990) and BS 8110-97 (1997) consider the punching shear resistance as a function of longitudinal reinforcement ratio. Hence, it is well established that punching shear strength of flat plates is significantly influenced by the flexural reinforcement ratio.