Experimental Study on the Static Behavior of Reinforced Warren Circular Hollow Section (CHS) Tubular Trusses

Yang, Wenwei; Lin, Jiankang; Gao, Ni-na; Yan, Ruhao

doi:10.3390/app8112237

Cited by 15 publications

(6 citation statements)

References 66 publications

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“…The ultimate bearing capacity of the CFST under axial compressive load has been investigated by scholars [14][15][16]. Scholars also have investigated the behavior of tubular trusses and a new form of bolted connection with a precast reinforced concrete shear wall [17,18]. Moreover, the influence of cracks on chloride diffusivity in concrete has been studied by scholars Jianxin Peng et al [19].…”

Section: Introductionmentioning

confidence: 99%

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

et al. 2019

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Forty-eight circular concrete-filled steel tube (CFST) columns subjected to lateral impact were tested to investigate the behavior of circular CFST columns under axial compressive load. Analyses of effects of concrete compressive strength, impact location and impact energy on residual ultimate axial capacity, ductility and initial stiffness are provided in this paper. It is found that lateral impact has negative effects on residual ultimate axial capacity of circular CFST columns from test results. Residual ultimate axial capacity decreases as impact energy increases and impact location comes close to the end of the specimen. It is also found that increasing concrete compressive strength can reduce the negative effects of impact location on residual ultimate axial capacity. Ductility and the initial stiffness of circular CFST columns decrease as impact energy increases. Ductility and the initial stiffness increase as impact location varies from middle-length to the end of specimens. When impact energy and impact location are constant, the ductility of the specimen with 30 MPa of concrete compressive strength is better than that of other specimens with different compressive strength. Besides, analyses of strain developments for 12 typical specimens to investigate failure modes under axial compressive load are provided in this paper. Strain developments have indicated that the steel at impact location becomes plastic faster than that at other locations. Based on the test results, a calculation formula is presented to predict the residual ultimate axial capacities of circular CFST columns subjected to lateral impact, and good agreement with experimental results has been achieved.

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Section: Introductionmentioning

confidence: 99%

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

et al. 2019

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“…The nominal steel grade was S275, with hot-finished tubes for tests 1, 2, 5 and 6, but cold-formed tubes for tests 3 and 4. To simulate the material behavior, isotropic bilinear hardening was assumed [42]. In the case of tests 3 and 4, a proportionality limit of 85% of the elastic limit was adopted, in accordance with [43].…”

Section: Validation Of Finite Element Modelingmentioning

confidence: 99%

The Resistance of Welded Joints of Galvanized RHS Trusses with Different Vent Hole Geometries

et al. 2019

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A worldwide-accepted technique to protect steel lattice girders with welded hollow sections against corrosion is the hot-dip galvanizing process. In this process, vent holes are required in braces to fill the inner part protecting them from corrosion, to allow the immersion of the structure in the zinc bath and to recover the excess fluid after the bath. The cross-section reduction due to the vent hole could lead to a decrease in the effective brace resistance; this is not easily quantified, because there are neither prescriptions nor recommendations in the design codes to assess this effect. Therefore, the hollow structural sections could be underutilized due to doubts regarding the safety of this type of joint. This research was conducted in order to categorize different geometries and positions of vent holes in order to determine the best in terms of joint efficiency. A validated finite element model considering welds on lattice girders joints was extended to take into account different vent hole shapes. This research concludes that the presence of ventilation holes such as the ones considered in this study does not significantly affect the joint resistance, and that all the analyzed hole shapes could be proposed as a valid solution for machining vent holes. The conclusions drawn up from this work could be useful for structural steel designers, providing them with valuable design recommendations.

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“…Nodes are affected by the bearing capacity and fatigue life, resulting in the node being the weak point in the overall structure. In order to improve the bearing capacity of the structure, the nodes are usually reinforced, and the commonly used forms of node reinforcement are pouring concrete inside the main tube, using internal stiffening ring reinforcement, external stiffening rib reinforcement, external stiffening ring reinforcement, and adding pads and ring mouth plates at the main tube nodes [1][2][3][4][5]. When the steel structure is subjected to strong seismic action, fracture damage will occur; fracture is a failure mode of the steel structure.…”

Section: Introductionmentioning

confidence: 99%

Study on the hysteresis performance of X-type round steel pipe stiffening rib coherent node based on microscopic fracture model

Wang,

Yang

2023

Preprint

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The cyclic cavity expansion model (CVGM model) is programmed into the VUSDFLD subroutine of ABAQUS software using the Frotran language to simulate the N-type circular steel tubular joints. Compared with the experimental results, it is found that the finite element simulation is in good agreement with the experimental results, which verifies the feasibility of using the CVGM model to predict the plane circular steel tubular joints. 14 X-type circular steel tubular joints and stiffener-reinforced X-type circular steel tubular joints were designed, The CVGM model was used to predict the fracture of these 14 joints, and the hysteretic behavior of the joints was studied. The results show that when the node is cracked, it is not destroyed immediately, and the node bearing capacity can continue to improve, at which time the hysteretic performance of the node is controlled by the degree of crack extension; The stiffening ribs can improve the ultimate bearing capacity, stiffness, ductility, and energy dissipation capacity of X-type round steel pipe coherent nodes so that the rate of node stiffness degradation is reduced and the seismic performance of the nodes is improved. An increase in the diameter-to-thickness ratio γ of the nodal main tube increases the ultimate load-carrying capacity, stiffness, ductility, and energy dissipation capacity of the coherent nodes of the stiffened rib-reinforced X-type circular steel tube but has a smaller effect on the rate of stiffness degradation; Node branch pipe and main pipe outer diameter ratio β increases, stiffening rib reinforced X-type round steel pipe coherent node of the ultimate bearing capacity, stiffness will increase, but the node ductility and energy dissipation capacity will be reduced, stiffness degradation of the speed of acceleration; Stiffening rib length L increases, the ultimate load carrying capacity, stiffness, ductility, and energy dissipation capacity of the coherent node of X-type round steel pipe reinforced by stiffening ribs will be increased, and the rate of node stiffness degradation will be less affected; The thickness of the stiffening rib tp increase, the ultimate bearing capacity, stiffness, ductility, and energy dissipation capacity of the coherent node of the stiffening rib reinforced X-type round steel pipe will increase, and the effect on the node stiffness degradation rate is small.

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Experimental Study on the Static Behavior of Reinforced Warren Circular Hollow Section (CHS) Tubular Trusses

Cited by 15 publications

References 66 publications

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

Behavior of Circular CFST Columns Subjected to Different Lateral Impact Energy

The Resistance of Welded Joints of Galvanized RHS Trusses with Different Vent Hole Geometries

Study on the hysteresis performance of X-type round steel pipe stiffening rib coherent node based on microscopic fracture model

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