the national bridge stock of iran consists of about 330,000 bridges, of which around 50% are older than 30 years. since 2010, iran road maintenance & transportation organization has started implementing a comprehensive bridge management system in order to manage this aged stock efficiently. to predict future conditions of bridge stock, a heuristic numerical method is presented. this methodology...

FOREWORD This research project was performed to investigate the possibility that, by measuring the dynamic response characteristics of a bridge substructure, it might be possible to determine the condition and safety of the substructure and identify its foundation type (shallow or deep). Determining bridge foundation conditions with this approach may be applied to quantify losses in foundation ...

This paper presents a stability investigation of a special-shape arch bridge with a span of 180 m. Its structure and mechanics are significantly different from normal arch bridges because of its single arch rib skewing across the girder, its hangers hanging unevenly along the arch rib with different aslant angle, and its arch rib being subjected to massive axial compression force, bending momen...

Railway track components located at bridge transition zones or approach areas suffer from impact load and vibrations caused by abrupt changes in track stiffness on the bridge and the subgrade. The numerous strategies that can be used to mitigate these abrupt track stiffness changes rely on one of two concepts. The first concept is that of providing a gradual stiffness change, and the second is ...

Heunks, Leo M. A., Mark J. Cody, Paige C. Geiger, P. N. Richard Dekhuijzen, and Gary C. Sieck. Nitric oxide impairs Ca21 activation and slows cross-bridge cycling kinetics in skeletal muscle. J Appl Physiol 91: 2233–2239, 2001.—The effects of the nitric oxide (NO) donor spermine NONOate (Sp-NO, 1.0 mM) on cross-bridge recruitment and cross-bridge cycling kinetics were studied in permeabilized r...

This article presents a numerical study that aims to explore the impacts of stiffness elastomeric bearings on dynamic behavior railway bridges under train-induced vibrations. For this purpose, finite element code considers vehicle–bridge interaction using coupled approach was developed. The software validated by comparing response analytical solution. analysis single- and multi-span with varyin...

Length changes of muscle fibers have previously been shown to result in a temporary reduction in fiber stiffness that is referred to as thixotropy. Understanding the mechanism of this thixotropy is important to our understanding of muscle function since there are many instances in which muscle is subjected to repeated patterns of lengthening and shortening. By applying sinusoidal length changes...

The PRE (numerical simulation-based vehicle and bridge parameter road roughness estimation) method uses vibration data to identify the vehicle’s bridge’s mechanical parameters estimate unevenness simultaneously. This randomly assumes first. Secondly, it solves IEP (input estimation problem) DRS (dynamic response simulation) from obtain profiles of front rear wheels. Repeat random assumption min...