general kind of encroachment of river is constructing a bridge on it. purpose of encroachment of river is occupation part of river and flood plain for constructing bridge. often being economical of bridge innovation affirmated that most of encroachment take place to river and flood plain, which this encroachment can be in form of embankment in flood plain of river or into the main bed of river ...

in this paper the effectiveness combination of bed sill and collar in reduction of local scour depth at cylindrical piers under clear water flow condition was investigated (v/vc=0.9). in the first of experiments, the bed sill was located in downstream and different distances from the piers. results indicated that minimum distance of the bed sill from the piers in downstream has maximum reductio...

A static and a dynamic analysis model are separately established using ABAQUS finite element program to study the mechanical properties of track structure and running stability and safety of the vehicle under the condition that uneven settlement of bridge piers exists. The static model is aimed at studying the effects caused by uneven settlement alone and the dynamic one is for the effects indu...

Abstract Bridge pier is a common feature in hydraulic structure. Its impact to the river usually occurs group form rather than single pier, so this challenging piers-group influence towards hydraulics and turbulence needs be explored. In paper, measurements were conducted using an Acoustic doppler velocimeter (ADV) study velocities three dimensions (longitudinal, transversal, vertical). Based o...

To investigate their adequacy as energy dissipating elements during earthquakes, this paper reports on cyclic inelastic tests executed to determine the maximum strength and ductility of four concrete-filled circular steel piers joined to a foundation detail proposed to develop the full composite strength at the base of these columns. Column diameters considered were 324 and 406 mm, with D/t rat...

This paper reports the findings of research examining the blast resistance of bridge piers that are designed in accordance with current knowledge and specifications to ensure ductile seismic performance. Blast testing was conducted on 1/4 scale ductile RC columns, and nonductile RC columns retrofitted with steel jacketing. The seismically designed RC and steel jacketed RC columns did not exhibi...

Plastic hinge models are widely used in earthquake engineering to predict the load-deformation relationships of reinforced concrete members. For the seismic assessment of bridges, it is appealing to use those relatively simple models if the response is predicted with sufficient accuracy. The applicability of these models to wall-type bridge piers with weak seismic detailing is examined. Flexura...

taining Lipoproteins in Obese Girls, Piers R. Blackett, Robin Germany, Boureima Sambo, and Petar Alaupovic, ( Department of Pediatrics, 2 University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104; 3 Medical Research Foundation, Oklahoma City, OK 73109; * address correspondence to this author at: Children’s Hospital of Oklahoma, Room 2426, 940 NE 13th St., Oklahoma City, OK 73104; f...

Diphenylamino(divinyl)borane (1a) adds two molar equivalents of Piers' borane [HB(C6F5)2] to give the expected double hydroboration product. In contrast diisopropylamino(divinyl)borane (1b) reacts cleanly already with one molar equivalent of HB(C6F5)2 to give the α-borylated tetrahydroborole derivative 10 in good yield. Subsequent treatment of 10 with benzaldehyde proceeded by retro-hydroborati...

In this paper, a forward-looking infrared (FLIR) video surveillance system is presented for collision avoidance of moving ships to bridge piers. An image pre-processing algorithm is proposed to reduce clutter noises by multi-scale fractal analysis, in which the blanket method is used for fractal feature computation. Then, the moving ship detection algorithm is developed from image differentials...