Stress and strain concentration factors of welded multiplanar tubular joints

The Fatigue Behaviour of Multiplanar Tubular Joints

Circular hollow sections are frequently used in structures subjected to fatigue loading such as bridges, offshore structures and cranes. These sections are generally connected by direct welding of the sections to each other. For the design of these welded connections, information is required on the fatigue behaviour. Especially for multiplanar...

The Fatigue Behaviour of T- and X-Joints Made of Square Hollow Sections

This work presents the results of experimental and numerical research on the fatigue behaviour of T- and X-joints between square hollow sections of which the brace is welded to the face of the chord, without any additional stiffeners. The work has been carried out in the framework of the CIDECT programme 7K "Fatigue behaviour ofuniplanar joints"...

Numerical analysis and discussion on the hot-spot stress concept applied to welded tubular KT joints

Nominal stresses have been used for a long time for the assessment of fatigue resistance of welded joints, however, this approach has strong limitations since the definition of the nominal stress may be subjective for complex welded details and/or complex loading. On the other hand, the hot-spot stress approach has been proposed to overcome...

Fatigue behaviour of root crack in stiffener-to-deck plate weld at crossbeam of orthotropic bridge decks

Steel Orthotropic Bridge Decks (OBDs) are widely used in long-span and movable bridges. Fatigue resistance analysis plays an important role in the design or assessment of OBDs. One possible fatigue failure is the crack initiating from the weld root of stiffener-to-deck plate connections at crossbeams. A full-scale experimental investigation...

Fatigue resistance of rib to deck, crossbeam to deck and deck to deck welds in orthotropic decks using structural stress

This study derives the fatigue resistance of welded details in orthotropic decks using structural stress (hot-spot stress where possible) based on tests described in literature and tests by the authors. The data are supported with linear elastic fracture mechanics simulations. Details covered are the rib to deck weld, the crossbeam to deck...

Fatigue evaluation on headed stud connectors with toe-plate failure mode using hot spot stress approach

The headed stud connectors are widely used in a variety of innovative engineering applications of the infrastructure sector. The fatigue life of headed studs is significantly affected by the residual stress introduced from welding procedures. It is very important to develop a reliable numerical method to predict the fatigue performance of...

Fatigue design investigation of the main- to cross-girder connection in steel railway bridges: A study on the beam railway bridges of the Oostertoegang in Amsterdam

Over the past few decades, the Netherlands has built numerous steel railway bridges to improve its infrastructure. The repeated loading from railway traffic makes steel bridges susceptible to fatigue damage. The stress ranges at fatigue-prone locations are generally higher in railway bridges than in road traffic bridges. Due to the limited space...

Fatigue assessment of rail track detail on movable bridge in Estonia based on 2D/3D Finite Element Modelling using hot-spot stresses

There are several methods to perform fatigue assessment as described by the Eurocode 3 and the International Institute of Welding (IIW). The codes establish the relation between stress ranges and their respective number of cycles until failure of the detail. This method is called S-N curves, however this is based mainly on nominal stresses. A...

Fatigue Life Assessment on the Star Frame of the Ampelmann System

Multiaxial fatigue: the influence of principal stress directions on the fatigue assessment of a stinger structure

The Allseas Group S.A. has made a name for itself in the field of offshore pipelaying and subsea construction by staying innovative. The company has six specialized vessels operating worldwide and the biggest vessel in the world is almost ready for operations. One of the company vessels is the Solitaire and lays pipe using the S-lay installation...

Improvements for the prediction of the fatigue life of the deck plate in orthotropic steel decks: A design optimization study

Fatigue is an important issue for orthotropic steel deck (OSD) bridges and therefore a design criterium. Cracks will initiate at several locations of the bridge deck. It is likely that a crack at the trough web to deck plate joint at the crossbeam will initiate first. This crack initiates at the weld root and propagates through the deck plate. A...

Fatigue of Welded Joints in Steel Marine Structures: Resistance of Double Sided Longitudinal Attachments and Single Sided Butt Joints ~ Design and Testing Considerations

Fatigue failure is a governing limit state for marine structures. Marine structures are composed of the numerous structural members connected by the welded joints which are the typically governing fatigue sensitive locations. In this thesis, attention has been paid to...

Finite element analysis of the closed stiffener to crossbeam connection in OSDs using the hot spot stress approach

An Orthotropic Steel Deck (OSD) is suspectable to fatigue and this forms an important design criterium. In this research the rib-to-crossbeam connection with a cope hole is studied using Finite Element Methods (FEM). The fatigue assessment is performed with the hot spot stress method making use of surface stress extrapolation. Two fatigue cracks...

Finite element modelling of open longitudinal stiffener to crossbeam connection in OSD bridges for hot-spot stress determination

The phenomenon of fatigue in orthotropic steel deck (OSD) bridges is a predominant problem because of complexity of the prediction methods. In the past, many researchers have studied the fatigue behaviour of various details in OSDs via both experiments and Finite Element Modelling (FEM). In the present research, the connection of open stiffener...

The Effective Notch Stress Approach for a Tubular Joint

Offshore wind energy production is increasing rapidly and optimising the design of support structures has the potential to significantly reduce steel and costs. Jacket structures are commonly selected for deeper waters, and the design of these structures is primarily influenced by the fatigue performance of the tubular joints. The fatigue...

Fatigue analysis of discharge area of 26kl tank container under railway transportation

Tank containers are intermodal containers for the transport of liquids, gases, and powders as bulk cargo However, hazardous vibration during transportation would generate fatigue damage at discharge area. This thesis aims at calculating fatigue damage at discharge area of a specified tank container. <br/><br/>The calculation is performed in time...

Fatigue assessment in finite element analysis: A post-processor to FEA output for hot spot stress calculation

For the fatigue assessment of welded structures, several design methods are described by the design codes of IIW, Eurocode3 and DNV. The relation between the stress range and cycles to failures were derived from experiments: the SN curves. With the increased accessibility of finite element software to engineers, a more flexible approach emerged:...