A case study of replacement of external post-tensioning cables

Rammer, Yves; Espion, Bernard

doi:10.1680/bren.13.00019

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…The general concept most likely came from Magnel, but the detailed design was performed by the engineer Alexandre Birguer. The prestressing tendons in that bridge were replaced in 1990, and the author is aware of at least five other bridges built in Belgium before 1960 with external prestressing, where the corroded tendons had to be replaced, which was not always straightforward (Rammer and Espion, 2014).…”

Section: Michel Provost Mcengmentioning

confidence: 99%

Discussion: Civil engineering heritage: country profile – Belgium

Espion

EngelsRobin²,

ProvostMichel

et al. 2018

Proceedings of the Institution of Civil Engineers - Engineering

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). Each bay has four beams of 165 ft (50 m) span at 33 ft (10 m) centres of 8 ft (2·4 m) depth. Each beam is of box-girder shape with internal Magnel-Blaton prestressing cables. The front beam over the doors is rectangular and the other three are trapezoidal. Each beam was constructed on the ground and jacked into place using temporary ladders fixed to the sides of the columns. Caston-site reinforced-concrete roof slabs span front to back on the main beams. Grimbergen mushroom hangarsThe two circular aircraft hangars were originally described in La Technique des Travaux for January-February 1952, as in UK (Anon., 1953a(Anon., , 1953b. The roof is a circular concrete shell of 164 ft (48·7 m) dia. and maximum height of 23 ft (7 m). It comprises a central dome of 72 ft (22 m) dia. supported on four double columns around the perimeter, with an outer cantilevered 46 ft (14 m) beyond the columns. Roof thickness varies between 3 inches (76 mm) in the central dome to 4·75 inches (120 mm) in the outer cantilever. The hangar is closed by sliding doors covering the 490 ft (149 m) circumference. The design was by M. Hardy of Quievrain, the engineers were Blaton-Aubert of Brussels. Other early post-WW2 prestressed-concrete structures in BelgiumProfessor Gustave Magnel lists various applications of prestressed concrete in his 1949 paper (Magnel, 1949). These include a railway bridge in Brussels, road bridges at Eecloo and Ghent, a footbridge at Malheyre, textile factories in Brussels and Ghent, cement silos at Tournai, spun-concrete pressure pipes and underpinning works as well as hangars at Rotterdam and Melsbroek, as above.

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Section: Michel Provost Mcengmentioning

confidence: 99%

Discussion: Civil engineering heritage: country profile – Belgium

Espion

EngelsRobin²,

ProvostMichel

et al. 2018

Proceedings of the Institution of Civil Engineers - Engineering

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“…It was proposed to apply the partial stress release method (stress release by notching and restoration by flat jacks) that had already been successfully used at the request of the same project authors for measuring the stress state on site in a large masonry arch bridge [7]. The results of the experimental evaluation of the residual prestressing can be found in [8].…”

Section: First Generation Prestressed Concrete Structuresmentioning

confidence: 99%

Three Case Studies of Construction History Applied to the Assessment of Engineering Heritage Structures

Espion

Rammer

Hellebois³

et al. 2015

IABSE Reports

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The paper will illustrate the contribution of research into Construction History in condition assessment or residual carrying capacity situations for three old types of concrete constructions. We will address: -the problem of assessing the actual carrying capacity of "Hennebique" reinforced concrete type beams with their characteristic reinforcement system, widespread in many countries before the First World War.-the replacement of the external post-tensioning tendons within a hollow box girder railway bridge built in the early 1960s with the "Blaton-Magnel" anchorage system developed in Belgium from 1941 onwards, and used until the early 1960s, in Belgium and abroad.-the structural assessment of thin concrete hyperbolic paraboloid shells, which were highly popular with architects and engineers in 1950s-1960s.

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“…The paper by Rammer and Espion (2014) starts by offering an insight into the early development of Belgian post-tensioning before focusing on one of the last applications of the BlatonMagnel 'sandwich' system. The prestressing cables, being external to the concrete and only protected by cement grout, became so severely corroded as to jeopardise the safety of the structure.…”

mentioning

confidence: 99%