26,580 research outputs found
Star quilts, by Lois Rossetta Robison Bridges
No full textImage of a Star quilt created before 1950 by Lois Rossetta Robison Bridges. Also includes questionnaires describing the quilt completed by Max L. Day as part of the Utah Quilt Guild\u27s documentation days held from 1988-1994. Present owner, Max received it form Lila Day as a wedding gift in 195
Modelling Extreme Traffic Loading on Bridges Using Kernal Density Estimators
No full textInnovations on Bridges and Soil-Bridge Interaction (IBSBI 2011), Athens, Greece, October 13-15, 2011Kernel density estimators are a non-parametric method of
estimating the probability density function of sample data. In this paper, the
method is applied to find characteristic maximum daily truck weights on
highway bridges. The results are then compared with the conventional
approach.Deposited by bulk impor
Creating learning environments for compassionate care (CLECC) : a programme to promote compassionate care by health and social care teams
No full textMaximum dynamic stress on bridges traversed by moving loads
No full textMost current research on dynamic effects due to traffic load on simply supported bridges focuses on the mid-span section of the bridge, since this location corresponds to the worst static bending moment. However, the maximum total moment allowing for dynamics, may differ considerably from the maximum moment at mid-span. This paper shows how the maximum can occur in a section relatively far from mid-span with a significant difference in magnitude.Other funderJournal websitewww.bridgesjournal.comEuropean 6th Framework Programme ARCHES (Assessment and Rehabilitation of Central European Highway Structures)Publisher requires the journal URL to appear on the record: www.bridgesjournal.com. Could use Description web link: Journal website as in http://hdl.handle.net/10197/2437? - AV 1/11/2010 au ke SB. 15/11/'1
Using practitioner research to study vulnerable patients
No full textA study of the healthcare needs of patients with end-stage renal disease managed without dialysis was undertaken by the practitioner, Helen Noble. She and fellow authors Jackie Bridges and Julienne Meyer explain how this type of approach can yield unique result
Comparative structural response of two steel bridges constructed 100 years apart
No full textThis paper presents a comparative numerical analysis of the structural behaviour and seismic performance of two existing steel bridges, the Infiernillo II Bridge and the Pinhao Bridge, one located in Mexico and the other in Portugal. The two bridges have similar general geometrical characteristics, but were constructed 100 years apart. Three-dimensional structural models of both bridges are developed and analysed for various load cases and several seismic conditions. The results of the comparative analysis between the two bridges are presented in terms of natural frequencies and corresponding vibration modes, maximum stresses in the structural elements and maximum displacements. The study is aimed at determining the influence of a 1 century period in material properties, transverse sections and expected behaviour of two quite similar bridges. In addition, the influence of the bearing conditions in the global response of the Pinhao Bridge was evaluated
A mathematical model for assessment of material requirements for cable supported bridges: implications for conceptual design
No full textRecent technological developments have led to improvements in the strengths of materials, such as the steel and wire ropes used in the construction of cable supported bridges. This, combined with technological advancements in construction, has encouraged the design of structures with increasing spans, leaving the question of material and environmental costs behind. This paper presents a refined
mathematical model for the assessment of relative material costs of the supporting structures for
cable-stayed and cable suspension bridges. The proposed model is more accurate than the ones published to date in that it includes the self weight of the cables and the pylons. Comparisons of material requirements for each type of bridge are carried out across a range of span/dip ratios. The basis of comparison is the assumption that each structure is made of the same material (steel) and
carries an identical design load, q, exerted by the deck. Calculations are confined to a centre span of a three-span bridge, with the size of the span ranging from 500 m to 3000 m. Results show that the optimum span/dip ratio, which minimises material usage, is 3 for a cable-stayed (harp type) bridge, and 5 for a suspension structure. The inclusion of the self weight of cable in the analysis imposes limits on either the span, or span/dip ratio. This effect is quantified and discussed with reference to
the longest cable-supported bridges in the world completed to date and planned in the future
Experimental determination of dynamic allowance for traffic loading in bridges
No full textTransportation Research Board 89th Annual Meeting, Washington DC, 2010-1-10 to 2010-1-14Bridge codes adopt values for dynamic allowance in traffic load models that are necessarily conservative
to cover for an entire range of bridges with different mechanical characteristics, boundary conditions, and the large
number of uncertainties associated to the vehicle-bridge interaction problem. A further level of conservatism occurs
due to the independent manner in which the governing static load and the corresponding allowance for dynamics are
specified. In particular, certain bridges are not susceptible to high levels of vehicle-bridge interaction when loaded
by a critically heavy vehicle or a critical combination of vehicles. Recent advances in Bridge Weigh-In-Motion
technology allow not only to collect information on the weights, spacings and speeds of the traffic loads traversing a
bridge, but also to separate the maximum static strain from the total measured strain using a filtering procedure. In
this paper, maximum static and total load effects are collected and analysed for three different sites as part of the
European project ARCHES (6th RTD framework programme). Bridge measurements are used to discuss the
dynamics of the most frequent truck classes and the entire traffic sample. The measurements reveal a decrease in
percentage increment in dynamics and a reduction on the variability of the dynamic increment as the static load
effect increases. This phenomenon can be of particular relevance in the assessment of the dynamics of extreme
loading cases.Deposited by bulk impor
Non-Axisymmetric Effects on Long Liquid Bridges
No full textThe stability of long liquid bridges under non-axisymmetric disturbances like a microgravitational force acting perpendicular to the liquid bridge axis or a non-coaxiality of the disks is analyzed through an asymptotic method based on bifurcation techniques. Results obtained indicate that such non-axisymmetric effects are of higher order than those produced by axisymmetric perturbations
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