Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Yu, Zhixiang; Zhao, Lei; Guo, Liping; Liu, Yao‐Peng; Yang, Cheng-Fu; Zhao, Shichun

doi:10.1155/2019/7934696

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…They also developed a formula to calculate the internal forces of the optimized shed structure, and the results showed a reduction of approximately 20% in the maximum bending moment of the transverse and longitudinal beams after optimization. Yu et al [16] proposed a new piston-rod-supported flexible structure system based on flexible protective nets. The system demonstrated buffering, self-recovery, and rock ejection capabilities, with an impact force approximately 60% of that of sand and EPS cushioning layers under the same impact energy.…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact Cushioning Performance and Structural Optimization of a Modular Composite Buffering Structure

2024

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The traditional concrete rockfall shed, relying on a sand cushion for impact energy absorption, suffers from limited buffering performance, long recovery cycles, and inadequate resilience in emergency disaster prevention. To address these issues, this paper proposes a modular composite buffering structure comprising a flexible steel buffer and a sand cushion. A 500kJ impact test was conducted on the structure to investigate its mechanical behavior and rockfall cushioning performance. The test revealed the energy dissipation mechanism between the flexible steel buffer and the sand. Using the LS-DYNA platform, a FEM-DEM coupled dynamic numerical model was established to compare the cushioning performance of the buffering structure with other typical cushions. Additionally, the supports under the concrete slab and the structural layout of the flexible buffer were optimized to achieve better buffering and structural perfoemance. The research demonstrates that the composite buffering structure exhibits excellent cushioning performance, remaining intact under 500 kJ impact. Compared to sand material and EPS-sand cushion, the composite buffering structure reduces impact force by 62% and 20%, respectively. After replacing the supports under the slab by buckling corrugated tubes, the composite system is able to bear 1000kJ impact and the slab’s bearing capacity is improved. With its superior cushioning performance, the composite buffering structure shows great potential for engineering applications.

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Section: Introductionmentioning

confidence: 99%

Study on the Impact Cushioning Performance and Structural Optimization of a Modular Composite Buffering Structure

2024

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“…The lateral impact is one of the dynamic loads that cannot be ignored, which can cause serious damage and even the collapse of bridges and buildings [1,2]. Therefore, the impact resistance of structures has been studied by using several experiments and numerical simulations [3][4][5][6][7][8][9]. According to the impact load measured from lateral impact tests, the dynamic response process of a beam can usually be divided into three stages: the peak value stage, the platform stage, and the unloading stage [10].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis Method for the Peak Value Stage of Concrete-Filled Steel Tube Beams Under Lateral Impact

2019

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This paper proposes a dynamic response analysis method of concrete-filled steel tube (CFST) beams at the peak value stage under lateral impact load. Targeted calculation of the peak value stage, finite element analysis (FEA) was carried out to determine the calculation model suitable for the analysis of the peak value stage and the simplified trend curve of beam acceleration at the impact point. Then, an analysis method for calculating the dynamic response of a fixed-fixed supported CFST beam is proposed, which consists of the travelling hinge theorem and a prediction model of the simplified trend curve. The predicted simplified trend curve is applied to replace the motion constraint assumption of the impactor and beam in the travelling hinge model. In the meantime, the elastoplastic behaviour of the CFST beams is considered in the analysis process. Through the comparison of experimental results and analysis results, this analysis method can predict the time history curves of the acceleration and impact force of CFST beams reasonably.

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“…e wire-ring net shows complex nonlinear mechanical properties due to the under loading geometry of the ring, the nonlinear ring-toring contact, and the nonlinear material law of steel wire. Upon impact, these nonlinear mechanical properties are reflected by mechanical phenomena, including the bending and tensile stages of a wire ring, ring-to-ring contact with sliding friction, the flattening effect of steel wire bundles, and the rupture behavior of steel wire [5,8,9]. ese nonlinear processes result in highly complex analyses and wire-ring net designs, making it a subject for challenging research.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Numerical Modeling of the Wire‐Ring Net for Flexible Barriers

Liu

Guo

et al. 2019

Shock and Vibration

Self Cite

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To investigate the nonlinear mechanical behavior of the wire-ring net, this paper presents a new numerical model that can collectively consider equivalence between numerical and actual wire rings. Quasi-static tests, including tensile tests on steel wires and one-ring specimens, and puncturing tests on net specimens were conducted. Based on the test results, the axial constitutive curves of steel wires were obtained. The linear correlation equations for the breaking loads of the one-ring specimens and the puncturing strength of wire-ring nets were established, both of which were related to the number of windings. The wire rings were modeled via an equivalent structure with a single winding and a circular cross section. Equivalence between the numerical and actual wire rings in terms of bending and tensile strength, total mass, contact with sliding friction, and rupture behavior were also derived and presented. In particular, the emphasis was on simulating the flattening effect, a phenomenon rarely accounted for in conventional numerical models. All dominant factors were reflected in a model with the material law by the input of material parameters. The proposed mechanical model was calibrated and verified by the data from the tests of the wire-ring net. The calibrated mechanical model is also shown to successfully simulate a full-scale test of a flexible rockfall protection barrier according to the ETAG027 standard.

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Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Cited by 8 publications

References 30 publications

Study on the Impact Cushioning Performance and Structural Optimization of a Modular Composite Buffering Structure

Study on the Impact Cushioning Performance and Structural Optimization of a Modular Composite Buffering Structure

Dynamic Response Analysis Method for the Peak Value Stage of Concrete-Filled Steel Tube Beams Under Lateral Impact

Nonlinear Numerical Modeling of the Wire‐Ring Net for Flexible Barriers

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