FEM analysis of truss hollow section joint (original) (raw)

Numerical Modelling of Y Joints of Trusses Made of Steel Hollow Sections

Tehnicki vjesnik - Technical Gazette, 2020

The use of welded structural hollow sections in civil engineering is relatively new. Constructing and dimensioning joints of steel trusses made of welded structural hollow sections requires a more specified approach, compared to traditional joints, achieved by gusset plates. Stress and local deformations at the contact between elements are non-linear and very complex. In this paper, the FEM modelling of the Y-joint was performed, accounting for the non-linear behaviour of steel. The ultimate bearing capacities of the joint were determined numerically, by applying different failure criteria. The results showed very good agreement with the experimental data.

Joint Flexibility in Rectangular Hollow Section Trusses

1991

The normal practice in designing steel trusses is initially to consider them as being pin-jointed for preliminary sizing of the members. Subsequently the sections might then be checked for the combined effect of the axial and shear forces, and the bending moments that could be derived from a rigid joint analysis. In the case of trusses formed from Rectangular Hollow Sections (RHS), this method does not allow for the punch-in and pull-out effects of the struts and ties on the chords to which they are connected. In other words, the rigid joint assumption implies that full displacement and slope continuity exists between adjoining members. However, trusses welded from RHS members are neither rigid nor pinned, but have some intermediate flexibility between these two extreme cases.

Structural Analysis of T and KT Joints of a Steel Truss Structure using the Finite Element Method

Proceedings of the Tenth International Conference on Civil, Structural and Environmental Engineering Computing

The structural analysis of an outdoor footbridge designed as a 3D tubular steel truss structure is presented. Special emphasis was given to the study of the joints, of two different types: a "T"-joint and a "KT"-joint. Their behaviour is discussed and analysed using the Eurocode 3 methods and finite element models. These numerical models are extensively presented and discussed, reflecting the performed linear and both full material and geometric non linear analysis. An assessment of the applicability and accuracy of the code models is discussed, by comparing their results to the numerical results.

Finite element model for rectangular hollow section T joints

Rakenteiden Mekaniikka, 2018

Major developments in hardware and software enable researchers and engineers to apply non-linear finite-element analyses to study the behavior of tubular structures. However, to provide reasonable results, constructed finite element models should be verified and validated with experimental data. This article develops a finite element model for high strength steel rectangular hollow section T joints. The joints are considered under in-plane bending moment and axial brace loading. The paper determines the most suitable finite elements and the number of layers in the thickness direction for the numerical assessment of initial stiffness and modeling the whole action-deformation behavior of joints. Finally, the proposed FE model is validated with the series of experimental tests. The validation shows that the developed model properly captures the local behavior of tubular joints and can efficiently serve as a reliable tool in routine numerical analyses.

Experimental analysis of an original type of steel space truss node joint

Facta universitatis - series: Architecture and Civil Engineering, 2009

In the paper is presented experimental analysis of an original type of node joint for a steel space truss. The joint sample was loaded by spatial set of forces that simulate real condition of the structure with eight balanced member forces (4 chord and 4 diagonal members), up to structure failure. It was realized in a specially designed test facility. Tested node joint samples were made in real scale, according to the model originated after FE analysis and optimization. Basic idea was to construct and test a node joint that can be made in average technology conditions, without special tools and requirements. Besides, results of a stress-strain FE analysis are presented and comparison of the two analyses is given for the most critical regions of the node joint. Values of measured and calculated strains across model samples and characteristic measuring points are presented.

Nodes of Hollow Core Profile Truss Bridges with Incomplete Welds

Proceedings of International Structural Engineering and Construction, 2022

Among the various types of steel bridge girders, trusses seem one of the most powerful and reliable. The individual members may be simple, but the nodes are the complex parts, especially if more than 4 members are connected. In view of the complexity, internal welds become inevitable and are inaccessible after finishing, which is overlooked easily during construction. The proposal is to eliminate those of the inside welds that may be dispensable. If some of them would be eliminated, the consequences may be acceptable, or require minor modifications only. The assumption is tried out on the example of a structure replacing a historic bridge. This structure is composed of rectangular hollow profiles, connected at nodes. Member forces and bending moments, have been determined. If the internal welds are about to be eliminated, an alternative load path is found. The calculation of stresses in the various fillet welds is based on the assumption of evenly distribution of forces. The weld stresses can be calculated by the derived formulas. The results show some welds require strengthening, due to the elimination of the more complicated internal welds. This concerns ultimate limit state. Thus, the possibility is confirmed that some of the internal welds may be eliminated, although there still is no proof the method may be applied to more complex nodes. Research must be continued to clarify this. For the type of hollow core members being considered, omitting of some internal welds may well be an acceptable alternative.

Maximisation of buckling resistance in structural members made of circular hollow sections

2020

This paper deals with the optimisation of the joint for thin-walled compressed elements that have circular hollow sections (CHS). A steel pipe is studied that has 3 m length, 52.3 mm diameter and 3 mm thick wall. Few examples of joint shapes are proposed. The first of them uses two extra plates that are perpendicular to the circular section. They are both in the shape of an isosceles triangle with 100 mm long and 3 mm thick sides. The second option uses four of those triangle plates. The next step is to provide perforation only in the joint area as well as along the whole element. The last option is to use a short smaller pipe inside the base pipe. Results have been compared to each other and conclusions are summarised.

ANALYSIS OF STRESS IN CIRCULAR HOLLOW SECTION BY FEA AND ANALYTICAL TECHNIQUE

This study focus on stress calculation in a cantilever beam by FEA &Analytical techniques. To know the value of maximum load bearing capacity of any particular beam this study has been generated. Structural analysis is foremost requirement in a design process. Also when we perform FEA analysis of any structure we cannot blindly trust on its result. If we don't have any past result data of that structure, it became difficult for us to know the deviation of result. For that purpose we may require analytical calculation result in order to compare result value of FEA. Hence in this study a range of load values are applied on cantilever beam by both techniques. Later graph has been plotted for different load values & verification of results is carried out.

Behaviour of a Space Inverted Triangular Steel Truss

The Baltic Journal of Road and Bridge Engineering

Behaviour of the inverted triangular truss, which is widely used as a bridge girder, was investigated analytically and experimentally. Cold-formed square hollow cross-sections of steel grade S355J2H with dimensions 80 mm × 4 mm, 90 mm × 4 mm and 40 mm × 4 mm were selected for the top and bottom chords and bracing elements of the truss with 12.56 m span, correspondingly. Five FEM models were developed using software Dlubal RFEM. The main specific feature of the models is the difference in modelling of joint behaviour considering plastic behaviour and stiffness of truss connections. It was shown that the FE model of the truss where the members were modelled by the truss type finite elements and the joints modelled by the shell type ones allows predicting behaviour of the truss with precision of up to 3.9%. It was shown that precision of the suggested FEM model grows 4.36 to 4.62 times in comparison with the traditional FEM models where the members were modelled by the truss finite ele...