نتایج جستجو برای: centering pier
تعداد نتایج: 4390 فیلتر نتایج به سال:
Original scientific paper The objectives of this paper are to perform a comparative analysis of the large-scale system of a high-pier railway bridge subjected to stationary and nonstationary spatially varying earthquake excitations using the pseudo-excitation method (PEM), and to estimate whether or not the non-stationary stochastic analysis of the high-pier railway bridges under tri-directiona...
An aqueduct is a bridge-like structure that supports canal passing over river or low ground, and it an important part of water conveyance system. Aqueduct piers are extremely vulnerable to damage during strong earthquakes can result in structural collapse. Further, excessive seismic displacement will also fracture aqueduct’s rubber water-stop interrupt the normal service after earthquake. There...
An experimental approach was carried out to study the time development and extension of scouring around a circular pier protected by a collar. The experiments included the study of scouring around an unprotected pier as well as the pier protected with collars located at different levels. Width of collars was 3 times the pier diameter. It was found that with collars, though the scour depth and t...
Submerged vanes are low aspect ratio flow-training structures mounted vertically on the river bed at an angle to the prevailing flow. The aim of application of vane is to generate a secondary circulation in the main flow, designed to modify the near-bed flow pattern and thus redistribute flow and sediment transport within the channel cross section. Collar is a flat sheet with low thickness fixe...
Flow pattern around the bridge piers includes water surface profile, velocity profile, shear velocity, shear stress distribution, etc. In this research, the effects of the base shape along with scale effects on the flow pattern around the rectangular bridge piers were numerically calculated through "Fluent Software", using Horizontal Velocity Distribution (Vx) and Vertical Velocity Distribution...
The use of slot through a pier is a new method proposed to control local scour at bridge piers. In this study, control of local scour at bridge pier is studied using 20 pier models under clear water conditions. The models consist of one circular pier without slot, three round-nosed piers without slot, and 16 piers with slot. Two slot lengths were chosen (yl=b and yl=2b, where y1 is the length o...
Pelicci, Leonardo Flenghi, Massimo F. Martelli and Antonella Santucci Roberto Giardini, Antonella Aiello, Hans-Dieter Foss, Iguacyra Araujo, Marco Fizzotti, Pier-Giuseppe Wolf-Peeters, Gregor Verhoef, Fabio Menestrina, Giuseppe Todeschini, Marco Paulli, Mario Lazzarino, Brunangelo Falini, Stefano Pileri, Pier Luigi Zinzani, Antonino Carbone, Vittorina Zagonel, Chris Lymphoma: Clinico-Pathologic...
introduction: transportation is an important iatrogenic endodontic error which might cause failure. this study evaluated the canal transportation caused by neoniti and protaper instruments, using cone-beam computed tomography (cbct) cross sections. methods and materials: this in vitro experimental study was performed on 40 mesiobuccal roots of maxillary first molars. the teeth were scanned with...
Massimo Cugno1, Mara Cabibbe1, Monica Galli 2, Pier Luigi Meroni3, Sonia Caccia4, Rosaria Russo4, Bianca Bottasso1, Pier Mannuccio Mannucci.1 1Department of Internal Medicine and Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, IRCCS Maggiore Hospital and University of Milan, Milan, Italy. 2Department of Hematology, Ospedali Riuniti, Bergamo, Italy. 3Department of Internal Medicine, Univ...
A nonlinear approach for the life-cycle cost (LCC) analysis is proposed. Computational procedure for the analysis of LCC for seismically isolated bridges in a region of low to moderate seismicity is established. To compute the failure probability of critical structural components, most probable failure modes for the structure-isolator system are defined as unseating failure of a superstructure,...
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