Große Stabdurchmesser und hohe Bewehrungsgrade.

Large diameter bars and high reinforcement ratios – part 1: anchorages and laps According to Eurocode 2, large diameter bars > ∅ 32 mm may only be positioned taking additional rules into account. In contrast, the proposal for Eurocode 2 does not include any additional rules for large diameter bars. The additional rules were investigated with ∅ 40 mm reinforcing bars within two comprehensive experimental investigations at three institutes. After the investigation of ∅ 40 mm reinforcing bars, tests with ∅ 28 mm bars were also conducted to find the connection to conventional bar diameters. This article describes the experimental bond tests conducted at RWTH Aachen University that comprised beam‐end tests, four‐point bending tests with laps and end anchorages in simply supported beams. The test results are used to relax some additional rules. In the following, different design approaches are analysed with a database evaluation for the maximum steel stress to be developed in anchorages and laps. The design approaches for the calculation of necessary anchorage and lap lengths were compared on the basis of a database. [ABSTRACT FROM AUTHOR]