Fatigue Capacity of Load Carrying Fillet-Welded Connections Subjected to Axial and Shear Loading

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Axial Loading ◽  
Steel Structures ◽  
Fatigue Tests ◽  
Shear Loading ◽  
Fillet Welds ◽  
Strength Analysis ◽  
Load Carrying ◽  
Eurocode 3 ◽  
The Status ◽  
Current Design

The status on current design recommendations concerning the fatigue capacity of load carrying fillet welds was presented by Maddox (Maddox, S., 2006, “Status Review on Fatigue Performance of Fillet Welds,” Proceedings of the OMAE Conference, Hamburg, Germany, Jun., Paper No. OMAE2006-92314) based on a literature survey. In order to examine the validity of the recommendations and to supplement the fatigue test database, a test matrix with 33 specimens was developed. This included 8 simple fillet-welded cruciform joints that were subjected to axial loading and 25 fillet-welded tubular specimens that were subjected to axial load and/or torsion for simulation of a combined stress condition in the fillet weld. The data obtained from these fatigue tests are presented in this paper. The test data are also compared with design guidance from IIW (1996, Fatigue Design of Welded Joints and Components: Recommendations of IIW Joint Working Group XIII-XV, A. Hobbacher, ed., Abington Publishing, Cambridge), Eurocode 3 (1993, Eurocode 3: Design of Steel Structures—Part 1–1: General Rules and Rules for Buildings), and DNV-RP-C203 (DNV, 2005, DNV-RP-C203, Fatigue Strength Analysis of Offshore Steel Structures).

Fatigue Capacity of Fillet Welded Connections Subjected to Axial and Shear Loading

2006 ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Test Data ◽  
Stress Condition ◽  
Axial Loading ◽  
Fatigue Tests ◽  
Shear Loading ◽  
Cruciform Joints ◽  
The Status ◽  
Current Design ◽  
Tubular Specimens ◽  
Design Guidance

The status on current design recommendations concerning the fatigue capacity of fillet welds was presented by Maddox (2002), based on a literature survey. In order to examine the validity of the recommendations and to supplement the fatigue test data base, a test matrix with 33 specimens was developed. This included 8 simple fillet welded cruciform joints that were subjected to axial loading and 25 fillet welded tubular specimens that were subjected to axial load and/or torsion for simulation of a combined stress condition in the fillet weld. The data obtained from these fatigue tests are presented in this paper. The test data are also compared with design guidance from IIW (1996), Eurocode 3 (1993) and DNV-RP-C203 (2005).

Fatigue Analysis of Load-Carrying Fillet Welds

2005 ◽  
Vol 128 (1) ◽  
pp. 65-74 ◽  
Author(s):  
John Dalsgaard Sørensen ◽  
Jesper Tychsen ◽  
Jens Ulfkjær Andersen ◽  
Ronnie D. Brandstrup
Keyword(s):  
Steel Structures ◽  
Offshore Structures ◽  
Fatigue Tests ◽  
Fillet Welds ◽  
Fatigue Lifetime ◽  
Fatigue Stress ◽  
Wide Range ◽  
Load Carrying ◽  
Plate Connection ◽  
Throat Section

The fatigue strength of load-carrying fillet welds is, in most codes of practice, performed neglecting the influence of bending in the weld throat section. However, some commonly applied structural details give rise to significant bending in the weld throat section. An example of such a detail is a doubler plate connection, which is often applied in connection with modifications of offshore structures. As a part of the present work, fatigue tests have been performed with test specimens fabricated by the current industry standard for welded offshore steel structures. The fatigue tests show that the degree of bending (DOB) has an influence on the fatigue lifetime. The fatigue lifetime decreases significantly when increasing the bending stress. In order to take into account the effect of the bending, a new fatigue stress definition applicable for fillet welds failing through the weld is presented. Using the test results, it is shown that the new definition of fatigue stress can be used for a wide range of DOB with a low standard deviation of the resulting SN curve.

An Experimental Study on the Shear Strength of Steel Structures Joints

2012 ◽  
Vol 268-270 ◽  
pp. 279-282
Author(s):  
Piero Morelli
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Failure Modes ◽  
Axial Loading ◽  
Steel Structures ◽  
Shear Loading ◽  
Testing Device ◽  
Static Loads ◽  
Structural Joints ◽  
Structure Collapse

The results of an experimental investigation on the shear strength of structural joints are presented and discussed. Joint typologies generally employed in structural frames of industrial warehouses and intermediate floors are taken into consideration. Specimens were supplied by an industrial shelving manufacturer, in two different configurations: the first one characterized by steel pressed geometrical connectors and the second one consisting in bolted fittings to angular welded supporting plates. A specific testing device has been designed in order to transfer axial loading into shear loading applied to a couple of joints in a symmetrical testing configuration. Quasi-static loads were applied with increasingly intensity steps, until the yielding of the material or the overall structure collapse were reached. Failure modes of the tested joints are analyzed and discussed.

The strength of fillet welds under longitudinal and transverse shear: a paradox

1985 ◽  
Vol 12 (1) ◽  
pp. 226-231 ◽  
Author(s):  
D. J. Laurie Kennedy ◽  
Gary J. Kriviak
Keyword(s):  
Longitudinal Direction ◽  
Longitudinal Axis ◽  
Fillet Welds ◽  
Strength Analysis ◽  
Design Standards ◽  
Transverse Strength ◽  
Strength Based ◽  
Current Design ◽  
Longitudinal Strength ◽  
Vector Sum

Fillet welds loaded only by transverse forces exhibit considerably greater strength than those loaded only by longitudinal forces. Current design standards in North America generally base the strength on the minimum value obtained in the longitudinal direction and consider that the strength is independent of the direction of loading. These standards require as well, that fillet welds loaded simultaneously by both longitudinal and transverse components be designed such that the vector sum of the components does not exceed the longitudinal strength. Experimental data, although limited, indicate that this vector approach is very conservative. Some standards do allow an ultimate strength analysis, although the method is not given. The transverse strength of fillet welds is about 1.45 times the longitudinal strength, and for angles of loading of up to 45° from the longitudinal axis, welds with transverse components have longitudinal capacities in excess of the longitudinal strength. Based on available test data, two alternative interaction relationships are proposed for the design of fillet welds loaded simultaneously by longitudinal and transverse forces. Key words: connections, design, fillet welds, longitudinal strength, transverse strength, steel.

Sign in / Sign up

Export Citation Format

Share Document