Tire‐derived aggregate layer performance in railway bridges as a novel impact absorber: Numerical and field study

Abstract

Summary The current paper aims to investigate the effects of tire‐derived aggregate (TDA) layer as a novel impact absorber in railway bridges. In the first step, a concrete short slab bridge was selected at Tehran‐Qom old railway line at 168 + 100 km of Tehran. In continue, for measuring field data, the nominated bridge was evaluated under moving train dynamic loads in both presence and absence of TDA layer as a damper material, which was located between the deck slab and ballast layer. In the second step, a 3D finite element model of selected railway bridge was developed, and corresponding results were compared with those obtained from the field and consequently, the numerical model validity was approved. Afterwards, basing on the verified model, a comprehensive parametric study was conducted on train wheel load, train moving speed, and TDA layer thickness to investigate their effects on track–bridge dynamic behavior.

The improvement of the dynamic behavior of railway bridge transition zone using furnace slag reinforcement: A numerical and experimental study

“…All the comparisons show that the simulation and measurement results have similar behavior and their values are in the same range. Considering the validation methods used in Refs., 7,49,54,55 it shows that the numerical model can be used for further studies, however, VIRM results have negligible incompatibility as 3.5% and 2% for soft-to-stiff and stiff-to-soft zones, respectively. This can be due to higher amount of axle load which influence on both behavior of FEM and field measurement.…”

“…To perform a comprehensive analysis on the dynamic behavior of the train-track system at the nominated bridge transition zone, a three-dimensional linear model was developed by the finite element software To assure that finer mesh has no influence on the final results, the size of meshes are chosen after a sensitivity analysis on the stress levels in ballast layer as Ref. 49 To decrease the time model run and saving cost based on a method in Ref. 50 for the FEM modeling, rails are modeled with a moment of inertia (I) and young modulus (E) of UIC54 and converted to rectangular shape as well as Ref.…”

Experimental and numerical study on the mechanical behavior of Kunststof Lankhorst Product (KLP) sleepers

“…The results were incorporated in the Matlab program [52]. Using Fast Fourier Transformer (FFT), the accelerations were converted to the frequency domain to obtain dominant frequencies of HDPE-25 [29]. is almost 8% higher than that of timber sleeper as 0.31.…”

“…Recently, composite sleepers are increasingly being used due to lower weight, thermal and electrical conductivity, and higher corrosion resistance, damping ratio and durability [25][26][27]. Composite sleepers are mostly regarded as a substitution for timber sleepers according to their geometrical and mechanical properties, especially in critical areas such as turnouts [28], bridges [29,30], and tunnels that damping and ductility features are more needed [31]. Recently, the new generation of KLP sleeper type with steel bars is offered to the market which has sufficient mechanical properties against high train axle loads.…”

Comparison study of crack propagation in rubberized and conventional prestressed concrete sleepers using digital image correlation

“…In this application, with a higher track stiffness, the dynamic impact is higher and consequently leads to more sleeper breakage. 4,5 In this regard, some researchers have proposed that using timber sleepers on bridge decks can provide more flexibility against train loads. 6 Although this approach can offer more flexibility, it is impossible to use timber sleepers in high-speed railway track due to their low stiffness, load capacity and durability.…”