Search

Load‐bearing and fatigue behaviour of butt welds in plates of different thicknesses The cross‐section of long‐span steel structures is usually adapted to the bending moment distribution. For this purpose, a thickness transition is applied in the area of butt‐welded joints in flanges of I‐shaped beam members. The fatigue behaviour of these constructional details is complex and differs from a butt‐welded joint in steel plates of the same thickness. This paper presents the results of 30 notch detail tests and compares the behaviour of butt‐welded joints in plates with a thickness transition with those of the same thickness. The statistical analysis of the experimental studies shows a higher fatigue resistance for butt‐welded joints with a thickness transition compared to butt welds of plates of the same thickness. The classification of the latter constructional detail in detail category 90 acc. to FprEN1993‐1‐9:2024 can be confirmed. The prognosis of the notch detail tests with the Two‐Stage‐Model confirms its applicability for the analytical‐numerical prediction of the service life of complex welded constructional details. In addition, the application of the model proves the influence of the thickness ratio and stress ratio on the service life of butt‐welded joints with thickness transition. [ABSTRACT FROM AUTHOR]

On‐site fire inspection by German fire brigades – fire tests in situ The German fire brigades have been systematically recording significant fires in buildings since 2016. Part of this recording is checking whether objectives are being violated. Together with the Technical University of Munich, the Munich fire brigade on behalf of the expert group for fire prevention of the German fire brigades evaluates this data on behalf of all fire brigades involved in Germany. This article presents the method and the first findings from these statistics. First trends show a considerably high number of smoke spreads, the direct effect of fire‐fighting measures and of organizational fire protection measures. [ABSTRACT FROM AUTHOR]

Abstract: A large data set of material property tests of neat seawater‐mixed OPC grout is analysed and compared with existing assumptions of EN 19902. Cube tests and cylindrical compressive strength tests show higher standard deviation than normal concrete and recommendations for acceptance criteria for quality and conformity control are made. The effect of high heat of hydration was investigated but no significant effect on strength development in the time frames considered could be reported. [ABSTRACT FROM AUTHOR]