Experiments on concrete filled and reinforced tubular K-joints of truss girder

Sakai, Yoshinaga; Hosaka, Tetsuya; Isoe, Akira; Ichikawa, Atsushi; Mitsuki, Kaoru

doi:10.1016/s0143-974x(03)00136-6

Cited by 80 publications

(29 citation statements)

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“…Due to the difficulty of performing experimental fatigue investigations on large-scale specimens, the majority of the tests on hollow section joints carried out to date have used isolated joints subjected to simplified loading [8][9][10]. The tests presented here belong to a relatively small group of tests of this size and configuration.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the fatigue behaviour of welded tubular K-joints for bridges

Schumacher

Nussbaumer

2006

Engineering Structures

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Fatigue tests were carried out on welded circular hollow section K-joints typical to bridges. The tests specimens were large-scale (approximately 9 m long and 2 m high) trusses loaded in the plane of the truss. Measured member stresses showed that a significant proportion of the load in a truss member may be due to bending, underlining the importance of considering correctly this load case in the design of these structures. Measured hot-spot stresses in the joints were compared with hot-spot stresses calculated using the current design guidelines. It was found that the measured values are considerably lower than the calculated values, calling into question the applicability of the design guidelines to these types of (bridge) structures.The S-N fatigue results from the current study, on the other hand, showed that the fatigue resistance of the joints that were tested is lower than the corresponding S-N design curves. This means that when the considerably higher calculated hot-spot stress range is applied to the corresponding design curve, the predicted resistance is similar to the resistance predicted using the lower measured hot-spot stresses in combination with the lower measured S-N curve too. This has highlighted the importance of relating hot-spot stresses to the appropriate, corresponding S-N curves.Evidence from the fatigue tests has clearly demonstrated the effect of size on the fatigue strength of welded tubular joints. A comparison of fatigue S-N results from smaller and larger welded circular hollow section (CHS) joints has shown the same trend indicated in design specifications: a thicker failed member results in a lower fatigue strength. The size correction factor integrated into the S-N design curves of the specifications, however, does not seem to represent this significant effect justly. In light of the size effect results presented in this paper and the major influence of this effect on the design of welded CHS joints in general, it is recommended that a soundly based solution with targeted S-N curves and a representative size effect should be sought.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the fatigue behaviour of welded tubular K-joints for bridges

Schumacher

Nussbaumer

2006

Engineering Structures

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“…In a CFST truss, the contribution of concrete to the strength of the tensile chord may be limited, but it may significantly enhance the joints between the chords and braces. As verified by experiments conducted by other researchers such as Packer [9], Sakai et al [10] and Udomworarat et al [11], filling the chord with concrete will greatly increase both the static and fatigue strength of the joint. Suggestion of partially filling the chords may work effectively for long span trusses because it can reduce the dead weight, but it may not be necessary for short span trusses.…”

Section: Introductionmentioning

confidence: 57%

Flexural behaviour of concrete filled steel tubular (CFST) chord to hollow tubular brace truss: experiments

Han

et al. 2015

Journal of Constructional Steel Research

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“…Substantial experiments (Liu et al, 2010;Packer, 1995;Sakai et al, 2004) and analysis of tubular structure indicate that the joints' strength and fatigue performance are governing factors in design (Hou et al, 2013;Liu et al, 2009;Machacek and Cudejko, 2009;Schumacher et al, 2009;Shi et al, 2012;Wang et al, 2013). In this paper, perfobond ribs (PBR) have been settled in chord joints for better performance than the hollow tubes.…”

Section: Introductionmentioning

confidence: 93%

Double-composite rectangular truss bridge and its joint analysis

Liu

Xiong

Luo

et al. 2015

Journal of Traffic and Transportation Engineering (English Edit

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Composite truss bridge Joint analysisPerfobond rib Concrete-filled tube a b s t r a c t This paper describes a novel composite tubular truss bridge with concrete slab and concrete-filled rectangular chords. With concrete slab plus truss system and joints reinforced with concrete and Perfobond Leiste rib, double composite truss bridge proved to be a fairly suitable solution in negative moment area. Perfobond Leiste shear connector (PBL) is widely implemented in the composite structure for its outstanding fatigue resistance. In this pilot bridge, Perfobond Leister ribs (PBR) were installed in the truss girder's joints, which played double roles as shear connector and stiffener. An erection method and overall bridge structural analysis were then presented. Typical joints in the pilot bridge were selected to analyze the effect of PBR. Investigation of the effect of PBR in concretefilled tubular joints was elaborated. Comparison has revealed that concrete-filled tubular joints with PBR have much higher constraint capability than joints without PBR. For rectangular tubular truss, the punching shear force of the concrete filled joint with PBR is approximately 43% larger than that of the joint without PBR. Fatigue performance of the joint installed with PBR was improved, which was found through analysis of the stress concentration factor of joint. The PBR installed in the joints mitigated the stress concentration factor in the chord face. Therefore, the advantages of this new type of bridge are demonstrated, including the convenience of construction using rectangular truss, innovative concept of structural design and better global and local performances. © 2015 Periodical Offices of Chang'an University. Production and hosting by Elsevier B.V. on behalf of Owner. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

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Experiments on concrete filled and reinforced tubular K-joints of truss girder

Cited by 80 publications

References 1 publication

Experimental study on the fatigue behaviour of welded tubular K-joints for bridges

Experimental study on the fatigue behaviour of welded tubular K-joints for bridges

Flexural behaviour of concrete filled steel tubular (CFST) chord to hollow tubular brace truss: experiments

Double-composite rectangular truss bridge and its joint analysis

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