Adam, VivianeVivianeAdamHerbrand, MartinMartinHerbrandHegger, JosefJosefHegger2025-10-232025-10-232020-11Bauingenieur 95 (11): 397-407 (2020)https://hdl.handle.net/11420/58188Increases in traffic loads and more restrictive design rules lead to higher demands on concrete bridges. Assessment of existing prestressed bridges revealed deficiencies in shear capacity. In a research project assigned by the German Federal Highway Research Institute (BASt), experimental and theoretical investigations were carried out aiming at proposing more refined design approaches for shear. In this paper, large-scale tests on continuous prestressed concrete beams conducted at the Institute for Structural Concrete of RWTH Aachen University are presented. The girders with rectangular or I-shaped cross-section featured small shear reinforcement ratios and distributed loads. Based on the findings, a refined shear design approach was developed. The modified truss model with additive concrete contribution allows considering additional shear capacity reserves compared to the current assessment guideline.de1436-4867202011397407VDI FachmedienTechnology::600: TechnologyTechnology::620: Engineering::620.1: Engineering Mechanics and Materials ScienceTechnology::690: Building, ConstructionJournal Article10.37544/0005-6650-2020-11-55Journal Article