Numerical and experimental tests of steel-concrete composite beam with the connector made of top-hat profile

Lacki, P.; Nawrot, Jacek; Derlatka, Anna; Winowiecka, J.

doi:10.1016/j.compstruct.2018.12.035

Cited by 30 publications

(11 citation statements)

References 33 publications

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“…Steel arch shotcrete composite support is frequently employed in the initial support of tunnels because it offers several benefits, including timely support, flexible operation, muscular flexibility, and excellent seismic performance. [1][2][3][4] However, in high geostress environments, steel and shotcrete composite structures frequently support heavy loads. [5][6][7] The steel and the spray mixing generate significant sliding because of the chemical bonding and friction.…”

Section: Introductionmentioning

confidence: 99%

Research on the bond‐slip behavior and constitutive relationship between I‐shaped steel and shotcrete in tunnel

Lü

Ran

et al. 2023

Structural Concrete

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The failure of the initial support of the tunnel caused by the synergistic deformation of steel and shotcrete under high‐ground stress is expected to be solved by arranging studs and steel webs to enhance the structure's bearing capacity. Hence, the bond‐slip mechanism of steel shotcrete with or without studs is unclear. This study aims to determine the bond behavior of the interface between the steel and shotcrete composite structure for tunnel support. The findings of push‐out experiments demonstrate that shotcrete on steel flange longitudinal splitting failure is the failure mode of natural bonding specimens. Tensile failure and expansion failure under the effect of studs is the failure mechanisms of stud steel‐sprayed concrete specimens. Furthermore, experimental data and a mathematical model establish the bond‐slip constitutive law of natural bonding and stud specimens. Finally, in addition to providing a theoretical foundation for the research of bond‐slip, the constitutive model put forward in this paper also supports the prevention of initial support failure in tunnel engineering.

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Section: Introductionmentioning

confidence: 99%

Research on the bond‐slip behavior and constitutive relationship between I‐shaped steel and shotcrete in tunnel

Lü

Ran

et al. 2023

Structural Concrete

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“…The primary support is typically made of shotcrete, steel arch frame, steel mesh, and rock bolts as it moves through the segment with bad surrounding rock conditions, such as, weak stratum or weathered capsule groove 4 . In primary support, the steel arch frame is often I‐shaped steel, because steel reinforced concrete (SRC) has several advantages over traditional reinforced concrete (RC), such as high bearing capacity and high rigidity 5,6 . I‐shaped steel wrapped in shotcrete is prone to rust due to the electrochemical action caused by chloride ion attack.…”

Section: Introductionmentioning

confidence: 99%

“…4 In primary support, the steel arch frame is often I-shaped steel, because steel reinforced concrete (SRC) has several advantages over traditional reinforced concrete (RC), such as high bearing capacity and high rigidity. 5,6 I-shaped steel wrapped in shotcrete is prone to rust due to the electrochemical action caused by chloride ion attack. The reason is that shotcrete has better penetration properties for Cl −1 , and Wang et al 7 attributed these to the porosity generated during shooting and the ''looseness'' of the microstructure due to the fast formation of ettringite and C S H gel.…”

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confidence: 99%

Experimental research and mechanical analysis on the bond‐slip behavior between concrete and corroded I‐shaped steel

Zhang

Wang

Guo

et al. 2021

Structural Concrete

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Corrosion of I-shaped steel in the primary support of the subsea tunnel is inevitable due to high chloride ion content, which will weaken the bond performance between concrete and I-shaped steel, resulting in a reduction in the service time of the subsea tunnel. Based on Xiang'an subsea tunnel, the bond-slip behavior between concrete and corroded I-shaped steel was studied by the accelerated corrosion tests and push-out tests, the experimental results indicated that: (1) The cracks of experimental specimens could be divided into two main forms: splitting failure (corrosion rate less than 5.79%); spalling failure (corrosion rate more than 5.79%). (2) A three-stage bond-slip law for concrete and corroded I-shaped steel was proposed, and the formulae for calculating the bond strength were established. Furthermore, the degradation process of bond-slip caused by corrosion was analyzed by energy principle and damage mechanics. Based on energy principle, it found that the elastic energy stored in the interface increased before the peak point of bond-slip curve and decreased after the peak point, while the dissipated energy in the interface always increased with slip value. Finally, the interface relative damage variable was defined based on secant line anti-sliding modulus and slip equivalent principle. The interface damage development process can be divided into three stages: initial damage, rapid damage development, and slow damage accumulation.

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“…The composite lining composed of initial support and secondary lining is often used in the subsea tunnel support system constructed by drilling and blasting method. Since SRC has several advantages over the traditional reinforced concrete (RC): these include high bearing capacity, high rigidity, good ductility and energy dissipation [5,6], I-shaped steel is generally installed in the initial support in the soft rock section of the subsea tunnel. Shotcrete employed for initial support is sprayed onto the substrate at a high speed through a pneumatic hose or pipe under the action of air pressure and compacted instantaneously [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bond-Slip Behavior between Corroded I-Shaped Steel and Concrete in Subsea Tunnel

et al. 2019

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Degradation of the bond between I-shaped steel and concrete due to the corrosion of I-shaped steel significantly affects the durability of steel reinforced concrete (SRC) structures. This study carried out the accelerated corrosion test and push-out test to study the bond-slip behavior and characteristics considering the corrosion of I-shaped steel, and test results indicated that: (1) The performance degradation of the bond-slip accelerated when the corrosion ratio reached 12%. (2) The corrosion failure pattern of SRC experienced slip phase and destruction phase in the rising stage. (3) Based on the principle of minimum potential energy, the bond stress was obtained only with the load and the displacement in the free end and the loading end. (4) Meanwhile, a new bond-slip degradation model was developed using the interface damage theory. Finally, the proposed model agreed with the experimental results.

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Numerical and experimental tests of steel-concrete composite beam with the connector made of top-hat profile

Cited by 30 publications

References 33 publications

Research on the bond‐slip behavior and constitutive relationship between I‐shaped steel and shotcrete in tunnel

Research on the bond‐slip behavior and constitutive relationship between I‐shaped steel and shotcrete in tunnel

Experimental research and mechanical analysis on the bond‐slip behavior between concrete and corroded I‐shaped steel

Experimental Study on Bond-Slip Behavior between Corroded I-Shaped Steel and Concrete in Subsea Tunnel

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