Numerical study on existing RC circular section members under unequal impact collision

Abstract

Traffic accidents and derailed train-related incidents have occurred more often than ever in recent years, resulting in some economic damage and casualties. Reinforced concrete (RC) constructions often involve derailed train and vehicle accidents. Rarely are such side collisions studied in previous studies. To do this, high-fidelity simulation-based finite-element (FE) models are created in this paper to accurately simulate the collision of circular RC members with a derailed train. The reinforced concrete member structure is common in high-speed railway stations. The impact energy of the impact body is significant, causing structural member failure. It analyses the dynamic behavior of reinforced concrete members under unequal span impact loads. Numerical implementations of impact issues are discussed from the perspective of geometric, contact, and material properties. The reliability and precision of the ABAQUS code to solve impact issues are verified by comparing failure modes, impact, and deflection time history experimental outputs. By analysing the impact response characteristics, used the control variables to study the failure process and mode (including the characteristics of impact and reaction forces, deflection time history curve, impact force–deflection curve, and bearing reaction force–deflection curve). The reinforcement ratio, impact velocity, concrete strength, and slenderness ratio significantly affect shear crack pattern and development. Changes in impact velocity and slenderness ratio also affect member failure modes.

Effect of the axial load on the dynamic response of the wrapped CFRP reinforced concrete column under the asymmetrical lateral impact load

“…The finite element model adopts a separate common node model. The author's previous work adopts the definitions of impact body, material properties, and supports [26,27]. When establishing a finite element model of an RC column, the size of the mesh density has a significant impact on the calculation accuracy of the model.…”

“…For members with axial force, one side has fixed and others with roller boundary condition, to model the members on a roller support that can only move horizontally, constrain its vertical and rotational DOFs but leave its horizontal DOF unconstrained. Boundary conditions, loads, contact definition, strain-rate effects, mesh density, and convergence analysis calculations are mentioned in [19,27].…”

Feasibility Study of Steel Derailment Containment Provisions through Quasi-Static Experiments

“…HSR holds the potential to significantly reduce travel time, improve travel efficiency, and facilitate economic and personnel interactions across different regions and cities, playing a crucial role in promoting a sustainable economy [4]. Nevertheless, the heightened speed of rail has also brought about an augmented risk of derailments, thereby diminishing safety levels during operations [5,6]. Derailments represent the most common type of train accident, resulting in potentially catastrophic consequences for heavy loss of human life and property [7][8][9][10].…”

Experimental study and numerical analysis on axial compression of round-ended concrete filled CFRP-aluminum tube columns

“…To enhance the mechanical performance of aluminum alloy structural components, researchers have proposed various forms of composite structural components, such as aluminum alloy tube concrete composites, carbon fiber reinforced plastic (CFRP) reinforced aluminum alloy composites and CFRP-aluminum alloy composite tube concrete composites, and have conducted fundamental studies on their mechanical performance. Khalil et al [10][11][12][13] has proven that CFRP has good reinforcement effects and can significantly improve the impact resistance and stiffness of components. Regarding aluminum alloy tube concrete composites, Zhou and Young [14,15] conducted axial compression performance tests on aluminum alloy reinforced concrete columns and studied the effects of different cross-sectional areas (square, rectangular and circular) and dimensions on their mechanical properties.…”