JW
J.C. Walraven
Authored
19 records found
Self-compacting high-performance fiber concrete for foundations
Part 2—Fiber orientation and distribution
An investigation was executed into the applicability of self-compacting
high performance fiber concrete in foundations. The applied concrete has
a concrete cube strength of about 110 MPa and contains 60 kg/m3 hooked-end steel fibers (LF = 30 mm, DF = 0.38 mm).
This publication
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Assessment of existing structures in fib modelcode 2020
Solutions and examples
For the assessment of concrete structures in the new fib Model Code 2020 (fib MC 2020), three categories are distinguished: (1) the residual capacity of existing structures without damage, (2) the residual capacity of structures suffering deterioration, and (3) the residual capac
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Self-compacting high-performance fiber concrete for foundations
Part 1 -experimental verification and design considerations
An investigation is carried out into the applicability of self-compacting high-performance fiber concrete (HPFC) in foundations. A concrete mixture has been designed with a concrete cube strength of about 110 MPa. The concrete contains 60 kg/m3 steel fibers. The properties of the
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Punching shear in prestressed concrete deck slabs
A comprehensive study
A large number of bridges in the Netherlands have transversely post tensioned deck slabs cast in-situ between flanges of precast girders and were found to be critical in shear when evaluated by Eurocode 2. To investigate the bearing (punching shear) capacity of such bridges, a 1:
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Codes of practice
Burden or inspiration?
Building codes are a necessity. The first codes were simple, easy to apply for designers and offered residual capacity for a low price. Meanwhile codes are significantly more complicated. This is partly due to the development of more scientific background knowledge and partly to
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Critical shear displacement theory
On the way to extending the scope of shear design and assessment for members without shear reinforcement
This paper presents a new theory for the shear capacity of reinforced concrete members without shear reinforcement. While recognizing that there are multiple failure mechanisms, the theory attributes the opening of a critical flexural shear crack as the lower bound of the shear c
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fib Model Code 2020
Towards a general code for both new and existing concrete structures
Discussions have been underway in fib (Fédération Internationale du Béton) about advancing the fib Model Code for concrete structures. These include the fib international workshop in The Hague (June 2015), the fib MC2020 Core Group meeting in Madrid (December 2015), and a series
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fib Model Code 2020
Towards a general code for both new and existing concrete structures
Discussions have been underway in fib (Fédération Internationale du Béton) about advancing the fib Model Code for concrete structures. These include the fib international workshop in The Hague (June 2015), the fib MC2020 Core Group meeting in Madrid (December 2015), and a series
...
fib Model Code 2020
Towards a general code for both new and existing concrete structures
Discussions have been underway in fib (Fédération Internationale du Béton) about advancing the fib Model Code for concrete structures. These include the fib international workshop in The Hague (June 2015), the fib MC2020 Core Group meeting in Madrid (December 2015), and a series
...
Punching shear in prestressed concrete deck slabs
Parametric study
Most Dutch bridges were constructed around the middle of the twentieth century and considering the fact that traffic has increased exponentially since, it is important to find out if these bridges are still safe for use. Experiments on a 1:2 scale were carried out in the laborato
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Punching shear in prestressed concrete deck slabs
Parametric study
Most Dutch bridges were constructed around the middle of the twentieth century and considering the fact that traffic has increased exponentially since, it is important to find out if these bridges are still safe for use. Experiments on a 1:2 scale were carried out in the laborato
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Querkrafttragfähigkeit von Platten nahe Auflagern
Übersicht über diverse Versuche
In Anbetracht steigender Verkehrslasten und geringer angesetzter Tragfähigkeiten in den vor Kurzem eingeführten Eurocodes steht in den Niederlanden die Querkrafttragfähigkeit vieler bestehender Brücken mit Stahlbetonmassivdecke zur Debatte. In den Normvorschriften werden jedoch g
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Spatmechanisme bepalend voor brandveiligheid tunnels
Ontwikkeling EEM-spatmodel voor spatgedrag beton in tunnels in kader van promotieonderzoek
In een promotieonderzoek aan de TU Delft naar het spatgedrag van beton onder brand is een EEMmodel afgeleid dat zowel poriedrukken als thermische spanningen beschrijft. Dankzij deze gekoppelde benadering is dit model een waardevolle aanvulling op de huidige praktijk van brandveil
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Existing structures often no longer meet the demands formulated in contemporary design codes with respect to structural safety and serviceability. This occurs, for instance, if the loads on existing structures, like traffic loads on bridges, are larger than assumed in the origina
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The purpose of this paper is to investigate the feasibility of using artificial neural network programming for the prediction of the fresh properties of self-compacting concrete. The input parameters of the neural network were the mix composition influencing the fresh properties
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Service life of concrete infrastructure is severely compromised because of chloride-induced corrosion and measuring the chloride content is crucial to determine the remaining service life. DuraCrete provides a chloride ingress model based on Fick’s 2nd law. Although the diffusion
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This paper presents a new concept to evaluate the shear capacity of reinforced concrete beams without shear reinforcement having flexural shear failure. Based on experimental observations, it is proposed that the opening of the critical inclined crack can be considered as the low
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This paper presents a new concept to evaluate the shear capacity of reinforced concrete beams without shear reinforcement having flexural shear failure. Based on experimental observations, it is proposed that the opening of the critical inclined crack can be considered as the low
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Contributed
1 records found
The spalling damage observed to concrete structures after severe fire exposure has been the topic of scientific research for the past decades. This phenomenon is commonly characterised by the sudden and in some cases violent breaking off of concrete pieces from the cross-section.
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