Finite element-based method for residual stresses and plastic strains in cold-formed steel hollow sections

Yao, Ye; Quach, Wai-Meng; Young, Ben

doi:10.1016/j.engstruct.2019.03.010

Cited by 31 publications

(54 citation statements)

References 35 publications

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“…Figure 8 shows the transversal residual stress distributions on square hollow section specimens. In all cases, the through-thickness transverse residual stress shows zig-zag type nonlinear distributions, which is similar to work presented by Yao et al 9 Moreover, the transverse residual stress is dependent on the amount of springback action. [42][43][44] Thus, in contrast to the situation of longitudinal residual stress (Figure 7), there is now the possibility of the upper surface of the sheet in a compressive stress state.…”

Section: Through-the-thickness Transverse Residual Stress Variationssupporting

confidence: 87%

Investigations of the through‐thickness residual stress distribution during the partial heating roll forming process of square and rectangular hollow steel sections

Mehari

Han

2022

Engineering Reports

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With the growing demand for rectangular and square hollow steel sections in the last few decades, the cold roll forming process has become a widely acknowledged manufacturing method. However, the residual stress generated during the roll forming process is one of the primary concerns on roll-formed products. One of the leading sources of residual stress is the severe plastic deformation that sheet metal experiences. It is well-known that residual stress significantly affects the product's service life. In this regard, several researchers have conducted numerical and experimental investigations of residual stress distributions on roll-formed steel sections. However, most of the studies found in the literature have been confined to the measurement of residual surface stresses. On the other hand, experimental studies conducted on fatigue and load-carrying capacity of hollow structural steels have shown that there is indeed a simple relation between the through-thickness residual stress distributions and mechanical properties of structures. Thus, this article employed a proper numerical modeling procedure using LS-DYNA's finite element code to explore through-thickness residual stress distributions generated during the roll forming process of rectangular and square hollow steel sections from different material grades. Moreover, a small-scale parametric study was conducted to explore the effects of the partial heating roll forming method on through-the-thickness residual stress distributions.

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Section: Through-the-thickness Transverse Residual Stress Variationssupporting

confidence: 87%

Investigations of the through‐thickness residual stress distribution during the partial heating roll forming process of square and rectangular hollow steel sections

Mehari

Han

2022

Engineering Reports

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“…Due to a large percentage of inelastic damage occurring in the beam elements, existing seismic standard codes require a strong-column weak-beam mechanism during their design [ 13 , 14 , 15 ]. A better understanding of the bending behavior of these elements and an appropriate method of modeling this behavior is required before steel tubes can be used for seismic design applications [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Prediction of the Bending Behavior of Circular Hollow Steel Tube Sections Using Finite Element Analysis

et al. 2022

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Circular hollow steel tube columns are widely used in high-rise buildings and bridges due to their ductility and lower weight compared to reinforced concrete. The use of this type of steel section has several advantages over using reinforced concrete members. The present study investigates the bending behavior of steel circular hollow sections when subjected to bending loads. The variations in material characteristics with regard to position along the cross-section of a steel tube member is first considered in this experimental study, providing for a more accurate definition of the material behavior in the model. A supported beam tested by two-point loads is the loading type that is used to study the bending performance of steel tubes. Ten circular hollow beam specimens were prepared and tested up to and post the failure stage with the following dimensions: thickness (2, 3, and 6 mm), diameter (76.2, 101.6, and 219 mm), and span (1000, 1500, and 2000 mm). A finite element analysis has been conducted for these ten specimens using the ANSYS program. The finite element model is compared to experimentally obtained data to verify that both local and global behaviors are correctly considered. The load-deflection results of this analysis showed a good agreement with the experimental results. A parametric study also was performed that considered two variables, which were the effect of the presence of circular rings and the change of opening location in the length direction on the specimens’ behavior. This study showed that the presence of the circular rings in the specimen led to an increase in its ultimate strength (of 53.24%) compared with the non-presence of these rings. In contrast, the presence of openings at 30, 40, and 50% from the specimen length reduced the strength capacity by 8.76, 14.23, and 17.88%, respectively.

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“…Due to the large percentage of inelastic damage occurring in the beam elements, existing seismic standard codes require a strong-column weak-beam mechanism during the design [14][15][16]. To achieve this, a better understanding of the bending behavior of these elements and an appropriate method of modeling this behavior are required before steel tubes can be used for seismic design applications [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Steel Circular Hollow Section under Bending Loads: Comprehensive Study of Mechanical Performance

et al. 2022

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The present study aimed at evaluating the mechanical performance under bending loads of circular hollow sections of steel. Different bending tests have been carried out by applying two-point loads, to determine and examine the effects of the diameter, the thickness of the section, and the span of the beam on the performance of the steel tube. The effects of square opening and variation in the number of openings on the performance of these sections have also been examined. Ten samples of hollow circular beams of varying thickness (2 mm, 3 mm, and 6 mm), varying diameter (76.2 mm, 101.6 mm, and 219 mm), and varying span (1000 mm, 1500 mm, and 2000 mm) were fabricated and tested for pre-failure and post-failure stages. The dimensions of the reference specimen considered were 3 mm in thickness, 101.6 mm in diameter, and 1500 mm in span. The results have shown that on increasing the section thickness by 200%, ductility and bearing strength were enhanced by 58.04% and 81.75%, respectively. Meanwhile, decreasing the section thickness by 67%, ductility and bearing strength were reduced by 64.86% and 38.87%, respectively. Moreover, on increasing the specimen diameter and on decreasing span, a significant increase in bearing strength and stiffness was observed; however, ductility was reduced. Meanwhile, on increasing the span of the specimen, all the parameters observed, i.e., bearing strength, stiffness, and ductility, decreased. On observing the ultimate strength of each specimen with square opening, the ultimate strength was reduced by 17.88%, 19.71%, and 14.23% for one, two-, and three-square openings, respectively. Moreover, the ductility was significantly reduced by 72.40%, 67.71%, and 60.88% for one, two-, and three-square openings/apertures, respectively, and led to the sudden failure of these specimens. The local buckling failure dominated for specimens having a D/t ratio more than 50 and showed very negligible levels of ovalization of the cross-section. Local buckling failure was observed to be prevented after providing the circular rings in the specimen, since bearing strength increased compared with the specimen without rings.

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Finite element-based method for residual stresses and plastic strains in cold-formed steel hollow sections

Cited by 31 publications

References 35 publications

Investigations of the through‐thickness residual stress distribution during the partial heating roll forming process of square and rectangular hollow steel sections

Investigations of the through‐thickness residual stress distribution during the partial heating roll forming process of square and rectangular hollow steel sections

Evaluation and Prediction of the Bending Behavior of Circular Hollow Steel Tube Sections Using Finite Element Analysis

Experimental Analysis of Steel Circular Hollow Section under Bending Loads: Comprehensive Study of Mechanical Performance

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