A large proportion of Iranian railway bridge assets comprises masonry arch bridges, which have been in service for over 70 years. Seismic assessment such structures is very important, particularly highly seismic regions. This study assesses the performance Veresk bridge, longest network (span length 99 m), spanning a valley 110 m deep, through reliable sensor-based model updating. Dynamic tests...

Abstract The paper shows the influence of some design parameters on general stability a single-track railway bridge, having structure made circular steel arches with rigid vertical hangers. following structural were considered in this analysis: closed bridge an upper winding horizontal members without links (diagonals) between them; elements and ties form cross diagonals; static scheme arch tra...

For patients with shortened dental arches, many treatment options are available. The existing situation can be maintained by stabilizing the present dentition and improving the occlusion without extending the arch. Alternatively, the shortened dental arch can be extended by either a free-end saddle removable partial denture, cantilevered fixed bridge, or by an implant-supported prosthesis. The ...

The dynamic pressure exerted on an arch rib by inner water under seismic excitation was studied based the smoothed particle hydrodynamics (SPH) numerical model. Numerical cases of different excitations in both horizontal and vertical directions depths were carried out. fast Fourier transform (FFT) showed that spike frequency is related to depth. surface wave very close first frequency. comes se...

With the increase of bridge-required demolition/dismantling for reconstruction or modification, early warning construction emergencies is greatly needed monitoring structural safety bridges under construction. In this paper, based on multi-source data nearby and demolition a large-span RC arch bridge in China, Analytic Hierarchy Process (AHP) method adopted to analyze set threshold According an...

Congenital partial hypodontia is a common disorder, and many treatments have been developed for adolescents, but each has had one or more significant drawbacks. Maryland Bridge, widely available treatment option, appears to offer great strength aesthetics. The option discussed in this article along with successful application of it. A young male patient reported us the chief complaint mi...

The main purpose of this paper is to give an overview on the state of the art of inspection, assessment and maintenance of masonry arch railway bridges by the presentation of the results of an ongoing international research project run by the International Union of Railways (UIC) with the participation of 14 railway administrations. The survey has shown that the European railways partaking in t...

PURPOSE To prospectively assess the outcome of immediate rehabilitation of extremely atrophic mandibles by a full-arch fixed bridge anchored to four implants. MATERIAL AND METHODS Twenty patients with edentulous mandibles were included in the study. Each patient received a full-arch fixed bridge supported by two axial and two distal tilted implants. Prosthetic loading was applied within 48 ho...

Steel bridge erection requires a series of processes in the construction site including shipping, sequentially lifting, and installing bridge components that are fabricated in the factory. Each process is critical and the risks are high due to the fact that conditions in the field are far more complex than in the factory. A detailed lifting plan is important to ensure the successful completion ...