Experiments of in-plane moment loaded welded tubular high strength steel T-joints of rectangular sections
Gavrilyuk, Danil (2020)
2020
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2020061418650
https://urn.fi/URN:NBN:fi:amk-2020061418650
Tiivistelmä
The purpose of this Bachelor’s thesis was to study high strength steel (HSS) welded joints. In recent times, application of HSS has increased significantly. However, current regulations offer rather conservative design approach by introducing reduction factor (k_HSS) and requirements for the minimum throat thickness of the fillet welds. These requirements provide designers with potentially uneconomical solutions, which clearly limit the application of HSS in building industry. The aim of the thesis was to support the claim stated in previous studies by Havula et.al (2018) regarding HSS T-joints design regulations review.
Six specimens of T-joints were made from welded rectangular hollow steel sections (RHSS) of S700 steel grade to be tested. Calculations were done in accordance with EN1993-1-8. The welds were 3D scanned in order to get accurate weld dimensions. The impact of heat affected zone (HAZ) on the joints was estimated by measuring the cooling time using infrared camera and related software. The process of the weld was measured and implemented in the calculations, in order to provide accurate input data for the comparative analysis.
The results of the thesis showed that the need for change of reduction factor in T-joints with S700 steel grade is required, as well as reduction of the minimum throat thickness.
Six specimens of T-joints were made from welded rectangular hollow steel sections (RHSS) of S700 steel grade to be tested. Calculations were done in accordance with EN1993-1-8. The welds were 3D scanned in order to get accurate weld dimensions. The impact of heat affected zone (HAZ) on the joints was estimated by measuring the cooling time using infrared camera and related software. The process of the weld was measured and implemented in the calculations, in order to provide accurate input data for the comparative analysis.
The results of the thesis showed that the need for change of reduction factor in T-joints with S700 steel grade is required, as well as reduction of the minimum throat thickness.