The finite-element analyses are done by assuming higher values of tensile strength of the brick masonry and the filler material in such a way that no cracks are developed from increasing axle loads. The analysis is carried by increasing the axle loads on the BOXNEL wagons in steps of 48 kN (5 t) from an initial value of 245 kN (25 t). The corresponding loads of the 168 sleepers loaded on BRN wagons are scaled up proportionately. The lateral boundary of the abutment of Span 1 on the CR end (Fig. 1) is assumed to be on springs simulating the partially filled up land arches. The spring constant (1,300 N/mm) is calibrated such that for an axle load of 245 kN (25 t) on the BOXNEL wagons, the deflection at the crown of Spans 1 and 2 match the field measurements.
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