Hybrid Foundation for Temporary Support of Fixed Tripod or Jacket Structure

2017 ◽  
pp. 826-830
Author(s):  
T Drummen ◽  
BFJ van Dijk ◽  
J Peuchen
Keyword(s):  
Temporary Support ◽  
Hybrid Foundation

Research and Application of Time-Variation Analysis and Key Control Technology in Complex Steel Structures Construction

2011 ◽  
Vol 368-373 ◽  
pp. 2319-2326
Author(s):  
Yan Lin Guo ◽  
Guang Yu Tian ◽  
Xiao An Wang ◽  
Guo Dong Chen ◽  
Feng Fan
Keyword(s):  
Time Variation ◽  
Steel Structures ◽  
Internal Force ◽  
Integrated Model ◽  
Construction Process ◽  
Variation Analysis ◽  
Structural Force ◽  
Temporary Support ◽  
Control Technologies ◽  
Traditional Construction

This paper presents Integrated Cooperative Time-variation System (ICTS) and its application for constructional process of complex steel structures. ICTS is based on integrated model comprised of structures, boundary conditions, loads, material properties, construction facilities, where all those are supposed to be time-variation associated with a complex construction process. ICTS can deal with mainly time-variation analysis of construction processes, including pre-set deforming, integrated lifting, temporary support removal, rotation pulling, sliding and tensioning. Besides, several key control technologies of structural force and configuration during structure construction process are introduced, such as obtaining error criteria of cable’s length in tensile structures, controlling influence of constructional environmental temperature, estimating differences between internal and external tubes’ vertical deformation of skyscrapers due to shrinkage and creep of concrete of internal tube, evaluating residual internal force of complex welding structures. ICTS and these key control technologies reinforce traditional construction analysis by keeping continuity of constructional process and simulating interaction of different parts in integrated model precisely, and reach to a design-required structural state accurately after finishing constructional process.

Centrifuge study of the combined bearing capacity of a hybrid foundation system

2013 ◽  
pp. 487-492 ◽  
Author(s):  
N Cheng ◽  
C Gaudin ◽  
M Cassidy ◽  
B Bienen
Keyword(s):  
Bearing Capacity ◽  
Hybrid Foundation

scholarly journals On preventing the dripping effect of overhang constraints in topology optimization for additive manufacturing

2021 ◽  
Author(s):  
Alain Garaigordobil ◽  
Rubén Ansola ◽  
Igor Fernandez de Bustos
Keyword(s):  
Topology Optimization ◽  
Additive Manufacturing ◽  
Prevention Strategy ◽  
Alternative Strategy ◽  
Manufacturing Processes ◽  
Support Structures ◽  
Local Minimizers ◽  
Constraint Function ◽  
Temporary Support

AbstractThis article falls within the scope of topology optimization for Additive Manufacturing processes and proposes an alternative strategy to prevent the phenomenon known as the Dripping Effect. The Dripping Effect is when an overhang constraint is imposed on topology optimization processes for Additive Manufacturing and is defined as the formation of oscillatory contour trends within the prescribed threshold angle. Although these drop-like formations constitute local minimizers of the constraint function, they do not provide a printable feature, and, therefore, they neither eliminate the need to form temporary support structures. So far, there has been no general agreement on how to prevent the Dripping Effect, so this work aims to introduce a strategy that effectively prevents it, and that at the same time may be easy to extrapolate to other types of geometric overhang restrictions. This paper provides a study of the origin of the Dripping Effect and gives detailed instructions on how the proposed prevention strategy is applied. In addition, several benchmark examples where the Dripping Effect is prevented are shown.

scholarly journals The Performance of Tied-Back Sheet Piling in Clay

1972 ◽  
Vol 9 (2) ◽  
pp. 206-218 ◽  
Author(s):  
G. C. McRostie ◽  
K. N. Burn ◽  
R. J. Mitchell
Keyword(s):  
Field Measurements ◽  
Triaxial Tests ◽  
Deep Excavation ◽  
Sheet Pile ◽  
Vertical Movements ◽  
Field Situation ◽  
Stress Changes ◽  
Temporary Support ◽  
Current Design ◽  
Horizontal Displacements

In Ottawa in 1969 a tied-back sheet pile wall was installed to provide temporary support in one side of a 12 m deep excavation through Champlain Sea deposits to shale bedrock. The wall was designed to permit as little yield as possible in order to safeguard the vital operation of an adjacent transformer building.To assess the performance of this structure, measurements of vertical movements of the surface adjacent to the wall, horizontal displacements of the wall, tendon loads and ground-water pressures were made as the excavation progressed.A series of triaxial tests was carried out in the laboratory to determine the form and magnitude of soil deformations under stress changes approximating those derived from the field measurements. Reasonable correlation is obtained when the results of these tests are used to estimate soil displacements in the field situation. The measured tendon loads are compared with those that would be expected using current design methods.

scholarly journals Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Tingting Sun ◽  
Zhihua Zhang ◽  
Jixin Yang ◽  
Jingnan Yang ◽  
Xuan Zhang
Keyword(s):  
Coordination Number ◽  
Dynamic Characteristics ◽  
Vibrational Frequency ◽  
Steel Pipe ◽  
Major Influence ◽  
Influence Zone ◽  
Large Velocity ◽  
Temporary Support ◽  
Steel Pipe Pile ◽  
Surrounding Soil

When bridge construction has been completed, the temporary support system, such as a steel-pipe pile, is dismantled, and problems that are related to the steel-pipe piles pulling from the strata are encountered. It is difficult to measure the dynamic characteristics of the surroundings during the deep pile-pulling process. A numerical model of the pulling pile is established by using the discrete element method (DEM). A sinusoidal dynamic load is executed on the pile with various vibrational frequencies. The stress, bond, coordination number, porosity, and velocity field distribution of the surrounding soil during the pile-pulling process are studied. The results demonstrate that, during the pile-pulling process, the shearing state of the surrounding soil depends on the position of the pile. The number and area of bond fractures gradually increase, the coordination number decreases, and the porosity gradually increases when the pile-pulling distance increases. Under a vibrational load, the area that corresponds to particles with large velocity and displacement expands with the increase of the vibrational frequency. The major influence zone of the pile pulling on both sides is concentrated within 6dpile, which can be used to evaluate the safety of the existing bridge nearby during pile pulling.

Temporary Support of the Lungs - the Artificial Lung

2007 ◽  
pp. 717-728 ◽  
Author(s):  
W. Federspiel ◽  
P. Sawzik ◽  
H. Borovetz ◽  
G. D. Reeder ◽  
B. G. Hattler
Keyword(s):  
Artificial Lung ◽  
Temporary Support

Dynamic Pumping Performance of the Hemopump®-A Small Intraventricular Blood Pump

1992 ◽  
Vol 15 (8) ◽  
pp. 493-498 ◽  
Author(s):  
E.E. Kunst ◽  
J.A. Van Alsté
Keyword(s):  
Differential Equation ◽  
Order Differential Equation ◽  
Axial Flow ◽  
Pressure Head ◽  
Blood Pump ◽  
First Order ◽  
Mock Circulation ◽  
Temporary Support ◽  
Axial Flow Pump ◽  
Flow Pump

We studied the pumping characteristics of the Hemopump®, a commercially availabe miniature intraventricular blood pump for temporary support of failing hearts. The Hemopump® is an axial flow pump of which the characteristics can be described by turbomachine theory. Experiments with water and a mock circulation verified that the pumping characteristics of the Hemopump®, in terms of both pressure head and flow as a function of rotational speed, very well can be described by a first order differential equation. The influence of blood with its non-Newtonian character is being investigated

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