Selection of butt-welded connections for joints between tubulars and cast steel nodes under fatigue loading

Veselcic, M.; Herion, Stefan; Puthli, Ram

doi:10.1201/9780203734964-72

Cited by 4 publications

(2 citation statements)

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“…Detailed information on the manufacturing processes was presented in former publications mentioned above. Details on quality levels and welding parameters mentioned in this section are described in detail in Veselcic et al (2006Veselcic et al ( , 2009.…”

Section: Testing Programmentioning

confidence: 99%

New experimental determination of fatigue strength of tubular truss joints in steel grades up to S690

Herion¹,

Ummenhofer²,

Veselcic³

et al. 2015

Tubular Structures XV

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In this paper research work on welded butt weld connections between hot-rolled seamless tubes and steel castings are presented. Comparison is made between different weld preparations for the butt welds including different steel grades, repair methods, the influence of residual stresses and a study on large scale trusses. The steel grades investigated include S550QH as well as S690QH to complement previous test results on lower steel grades. These investigations are intended to lead towards the development of a concept for improving the fatigue life for bridges using such end-to-end connections. ANALYSIS OF BUTT WELDED JOINTS OverviewButt welds are used in bridge constructions in multifaceted varieties as a connection of two chords or between cast steel joint and steel tube. These connections are butt welds with or without weld backing. All welds can be carried out as single side welds only. Within the scope of this project different variants for butt weld designs are investigated.Since the chemical as well as the mechanicaltechnological properties of the used cast steel parts are nearly the same as for the hot-rolled hollow sections, all following assumptions are not only valid for butt welds between hollow sections and cast steel parts but furthermore for butt welds connecting hollow sections also.The tests carried out on butt-welded specimen have been performed in close cooperation between Karlsruhe Institute of Technology (KIT) and the Center of competence for tubes and hollow sections (CCTH). On the basis of the test results derived from project P591(2010) and in close collaboration with EPFL Lausanne and the involved participants of the industry in the monitoring group of the project the research program for the examination of the butt welds was proposed. The objective was to reduce the previously investigated variants to the decisive ones and maintain a wide spectra of possible butt welded joints to perform an economic feasibility study with the different variants.In the first part the testing program with the different variant is presented. Subsequently the chosen materials are given and the fabrication of the test specimens is described. Special attention is placed on the non-destructive examinations. Furthermore, repair welding on different test specimens is considered. One of the main aspects of the project was on the investigation of high strength steels. These test results are illustrated with a detailed analysis.Furthermore, FE-calculations concerning the influence of the different wall-thicknesses and geometries have been performed. However, these results are not part of this paper. Testing ProgramDetailed information on the manufacturing processes was presented in former publications mentioned above. Details on quality levels and welding parameters mentioned in this section are described in detail in Veselcic et al. (2006Veselcic et al. ( , 2009.For the research projects steels according to Table 1 are considered for the tests. With the use of high strength steel, a reduction of the mem...

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Section: Testing Programmentioning

confidence: 99%

New experimental determination of fatigue strength of tubular truss joints in steel grades up to S690

Herion¹,

Ummenhofer²,

Veselcic³

et al. 2015

Tubular Structures XV

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“…Recently, a few tests have been conducted to obtain fatigue behaviour of the butt welds between cast steel joint and hot‐rolled steel tubular members. Veselcic compared fatigue strength of six types of weld detail by using four‐point bending tests and tension tests on small specimens. Haldimann–Sturm and Nussbaumer proposed recommendations for the design and fabrication of cast steel joints from the viewpoint of fatigue based on analytical and experimental research on cast steel joints connected with steel tubular members by butt welds.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance of butt welds between cast steel joint and steel tubular members

Han

Guo

Yin

et al. 2016

Fatigue Fract Eng Mat Struct

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Cast steel joints have gained increasing popularity for use in engineering. The fatigue performance of butt welds between cast steel joint and steel tubular members, however, is not yet well characterized. A series of fatigue tests were conducted on a new type of welding detail, cast steel joint with sloped end and integrated backing ring (Type C), for butt welds between cast steel joint and steel tubular members. Fatigue failure mechanism and S–N curves obtained from the tests were compared with those of Type A connection with backing ring and Type B cast steel joint with integrated nose obtained in literature. Fatigue behaviours of all three welding details were successfully predicted by local strain approach, the results of which are consistent with test results, especially for Types A and B welding details. According to the results of tests and analysis, fatigue cracking of butt welds between cast steel joint and steel tubular members always initiates from the bottom of the weld root, and the fatigue performance of Type C welding detail is better than those of Types A and B because of its lower stress concentration level. A simplified fatigue design equation was then proposed based on the results of local strain approach, in which the fatigue notch factor was adopted in fatigue behaviour evaluation. The accuracy of this simplified fatigue design equation was verified for Type C welding details with various geometry configurations.

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Defect Tolerance for Cast Steel Connections in Braced Frames

Iwashita

Packer

Oliveira³

2012

J. Struct. Eng.

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Selection of butt-welded connections for joints between tubulars and cast steel nodes under fatigue loading

Cited by 4 publications

References 0 publications

New experimental determination of fatigue strength of tubular truss joints in steel grades up to S690

New experimental determination of fatigue strength of tubular truss joints in steel grades up to S690

Fatigue performance of butt welds between cast steel joint and steel tubular members

Defect Tolerance for Cast Steel Connections in Braced Frames

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