Thermo-mechanical behaviour of ultra-high strength concrete encased steel columns in standard fires

Du, Yong; Qi, Hong-hui; Jian, Jiang; Liew, J.Y. Richard; Li, Shan

doi:10.1016/j.engstruct.2020.111757

Cited by 16 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The λ of specimens (1,2,3,4,5,6), (7,8,9,10,11,12), and (13,14,15,16,17,18) were designed as 1.5, 2.5 and 3.5, respectively, and the net lengths (l 0 ) of corresponding specimens were 1080, 1440, and 1800 mm. The shear bending section between the loading point and supporting point bore shear force and bending moment, whose lengths (l sb ) were 270, 450, and 630 mm, respectively.…”

Section: Shear Span Ratio λmentioning

confidence: 99%

“…Through statistical analysis, the volume ratio of longitudinal reinforcements and stirrups of SRC beams in engineering applications is between 1% and 3%. [42,43] To study the effect of steel fiber on crack elongation and mechanical properties of SSFRC beams with similar steel content, specimens (1,3,7,9,13,15), (2,4,8,10,14,16), and (5,6,11,12,17,18) were designed with ρ sf of 1%, 2% and 3%, respectively.…”

Section: Steel Fiber Volume Ratio ρ Sfmentioning

confidence: 99%

“…Specimens (1,2,7,8,13,14), (3,4,5,9,10,11,15,16,17), and (6,12,18) were equipped with No.10, No.12, and No.14 shaped steel, corresponding to the ρ ss of 5.67%, 7.18%, and 8.53%, respectively. The ρ ss was the ratio of the section area of shaped steel (A s ) to the section area of specimen, that is, ρ ss = A s /(b Â h).…”

Section: Shaped Steel Ratio ρ Ssmentioning

confidence: 99%

See 2 more Smart Citations

Experimental study on mechanical properties of steel and steel fiber reinforced concrete beams

Zhang

Lin³

et al. 2022

Structural Design Tall Build

View full text Add to dashboard Cite

Summary According to the construction difficulties in steel reinforced concrete (SRC) structures, rebar cages were discretized into steel fibers to form steel and steel fiber reinforced concrete (SSFRC) structures. The 18 SSFRC beams without rebar cages were tested under bending, and the effect of the steel fiber volume ratio (ρsf), shaped steel ratio (ρss), and shear span ratio (λ) on mechanical properties were investigated. Increasing ρsf could not only turn shearing failure and debonding failure into bending failure, and effectively reduce the sudden decrease of load, but also enhance the bearing capacity, ductility, and damage resistance of specimens to a certain extent. As the ρss ascended, the mechanical properties were obviously improved. However, ρsf should be accordingly increased to avoid adverse effects of excessive ρss. The specimen with small λ had the better bearing and energy dissipation capacity and poor ductility. A large λ meant that ρss and ρsf should be appropriately increased to prevent premature failure of specimens.

show abstract

Section: Shear Span Ratio λmentioning

confidence: 99%

Section: Steel Fiber Volume Ratio ρ Sfmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on mechanical properties of steel and steel fiber reinforced concrete beams

Zhang

Lin³

et al. 2022

Structural Design Tall Build

View full text Add to dashboard Cite

show abstract

“…As a preferred structural element type adopted in high-rise, large span and other heavily loaded structures, Steel Reinforced Concrete (SRC) column has been extensively researched in the past decades (El-Tawil et al, 1995; Lai and Liew, 2020a; Wang et al, 2019; Wu et al, 2019; Yang et al, 2018). Previous investigation covers a wide scope including the axial performance (Khan et al; Lai and Liew, 2021; Lai et al, 2019a; Lee et al, 2020; Khan et al, 2020a; Zhu et al, 2014; Yu et al, 2021), buckling behavior (Kim et al, 2014; Lai and Liew, 2020a, 2020b; Yang et al, 2019), flexural response (Kabir et al, 2020; Lai et al, 2021), fire resistance (Du et al, 2021; Li et al, 2021), shear strength (Xue et al, 2020; Xue et al, 2021), as well as the seismic performance under cyclic loading for a single member (Gautham and Dipti, 2021; Fang et al, 2015; Xue et al, 2019; Xue et al, 2020; Zhu et al, 2016) and a large-scale three-dimensional (3D) building frame (Liu et al, 2021). In addition to conventional steel and concrete materials, the behavior of SRC members made of Fiber Reinforced Concrete, Ultra High-Performance Concrete and Engineered Cementitious Composites have also been studied experimentally (Khan et al; Kabir et al, 2020; Lai et al, 2019b; Huang et al, 2020) and numerically (Khan et al, 2020b).…”

Section: Introductionmentioning

confidence: 99%

Numerical parametric study on the uniaxial and biaxial compressive behavior of H-shaped steel reinforced concrete composite beam-columns

Lai

Tan

Feng

et al. 2022

Advances in Structural Engineering

View full text Add to dashboard Cite

As a follow-up work of previous experimental efforts, this paper aims to further explore the compressive behavior of Steel Reinforced Concrete (SRC) composite beam-columns with assistance of nonlinear Finite Element Analysis. The FE model was developed in ABAQUS software and it delivered desirable accuracy after calibrating against the dataset collected from published literatures. The validated FE model was then employed to evaluate the fundamental performance of SRC beam-columns under uniaxial eccentric compression and biaxial eccentric compression. On top of that, the fiber section analysis was adopted to build the three-dimensional axial force-bending moment (N-M) interaction diagrams, followed by a parametric study to investigate the effect of material grade, steel ratio, cross-section geometry, load eccentricity and load inclination on the load-carrying capacity of SRC beam-columns, and disclose the complex biaxial interaction mechanism that is not well-considered in current design codes. Based on the numerical data generated from parametric study, the Support Vector Machine method is utilized to intelligently estimate the biaxial moment contours under varying load levels, which exhibits improved accuracy and consistency than the code-specified method and conventional empirical formulae.

show abstract

“…[1][2][3] Nevertheless, there are still many disadvantages to SRC. During construction, the simultaneous existence of the rebar cages and shape steel results in positional conflicts between shape steel and steel bars, which leads to the deterioration of the quality when pouring concrete and the difficulty of reinforcing steel binding, [4][5][6] as shown in Figure 1a. In addition, holes are usually opened on the flange and web of the shape steel during fabrication to prevent steel bars from being truncated, [7] as shown in Figure 1b.…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation and damage on the interface of steel and steel fiber‐reinforced concrete composite column

Qian

Zheng

et al. 2022

Structural Design Tall Build

View full text Add to dashboard Cite

To address the problems faced with steel-reinforced concrete (SRC) in construction, such as positional conflicts between steel and steel bars or difficulty in pouring concrete, a novel "Steel and Steel Fiber-Reinforced Concrete" (SSFRC) composite structure was proposed. Push-out tests of 34 SSFRC composite columns were carried out in this paper to study the interfacial bond performance from the perspective of energy dissipation. Based on loading-displacement (P-D) curves, the interfacial energy dissipation (W b ) and energy dissipation factor (λ) were introduced, and the influence of embedded length (L e ), steel fiber volume rate (ρ sf ), thickness of concrete cover (C ss ), and section type on W b and λ were analyzed. Test results indicated that circular column is better than square column in terms of W b and λ. The increase of L e , C ss , or ρ sf is beneficial to the improvement of W b , and λ is positively correlated with ρ sf and C ss but negatively correlated with L e . Additionally, the interfacial damage (D a ) was defined by the relationship between elastic deformation energy (W a ) and W b . It can be concluded that the ascent of L e and C ss can effectively delay the appearance of D a and inhibit the development of D a , respectively, and D a develops slowly with the increase of ρ sf at the later loading stage.

show abstract

Thermo-mechanical behaviour of ultra-high strength concrete encased steel columns in standard fires

Cited by 16 publications

References 25 publications

Experimental study on mechanical properties of steel and steel fiber reinforced concrete beams

Experimental study on mechanical properties of steel and steel fiber reinforced concrete beams

Numerical parametric study on the uniaxial and biaxial compressive behavior of H-shaped steel reinforced concrete composite beam-columns

Energy dissipation and damage on the interface of steel and steel fiber‐reinforced concrete composite column

Contact Info

Product

Resources

About