STUDIES AND RESEARCHES Annual Review of Structural Concrete Volume 31 – 2011/2012 Foreword – Premessa ......................................................................................................... 5 Pietro G. Gambarova, Antonio Migliacci and Paola Ronca, editors Technical Papers A Simpler Compression-Field Theory for Structural Concrete…..………………………………………………………………………..11 Luisa Mara Gil-Martin, Enrique Hernández-Montes, Mark A. Aschheim and Stavroula J. Pantazopoulou Shear Resistance of R/C Beams Provided with Differently-Inclined Transverse Reinforcement ……………………………………..……………………………….43 Piero Colajanni, Lidia La Mendola, Giuseppe Mancini and Antonino Recupero On the Role of Fibre-Reinforced Concrete in Improving the Shear Resistance of R/C Beams……………………………....……………………………63 Fausto Minelli and Giovanni A. Plizzari Mechanical and Cracking Behavior of Concrete Beams Reinforced with Steel Bars and Short Fibers…………….....................................................91 Emilia Vasanelli, Francesco Micelli, Maria Antonietta Aiello and Giovanni A. Plizzari Strengthening of R/C Beams with High-Performance Jackets………………………………115 Alberto Meda, S. Mostosi and Paolo Riva Concrete Slabs under Impact Load : Drop Tower Experiments…………………………….135 Birgit Beckmann, Anja Hummeltenberg, Tony Weber and Manfred Curbach An Experimental Methodology to Assess the Performance of Steel Fiber-Reinforced Self-Compacting Concrete (FR-SCC)..……………………….…155 Liberato Ferrara, Patrick Bamonte, Alessio Caverzan, Abdisa Musa and Irem Sanal