Joop den Uijl

Joop den Uijl
Delft University of Technology | TU · Department of Structural Engineering

Ms

About

41
Publications
14,776
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686
Citations
Citations since 2017
5 Research Items
470 Citations
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080

Publications

Publications (41)
Article
A recent contest of shear tests modelling was carried out in 2019. Teams from universities and consultancies around Europe were invited to predict the shear capacity of two reinforced concrete beams. The basics of the numerical models were to be set up according the Dutch NLFEM Guideline RTD 1016-1:2017. In the contest, two reinforced concrete beam...
Article
Full-text available
An experimental program was carried out to investigate the shear capacity of High-Performance Fiber-Reinforced Concrete (HPFRC) I-beams. The main parameters were assigned as the fiber content and presence of shear reinforcement. To study the effect of these main parameters on the shear capacity, testing of six I-beams and other control specimens wa...
Article
An experimental program was carried out to investigate the shear capacity of High-Performance Fiber-Reinforced Concrete (HPFRC) I-beams. The main parameters were assigned as the fiber content and presence of shear reinforcement. To study the effect of these main parameters on the shear capacity, testing of six I-beams and other control specimens wa...
Article
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 lower bound for the shear capacity of a structural member. It is also pro...
Article
Synopsis 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 capacity. It proposes that the shear displacement of an existi...
Article
Full-text available
In part I of this paper, dedicated to the subject of shear resistance under sustained loading (Sarkhosh 2015), a series of tests on reinforced concrete beams without shear reinforcement was described, which were subjected to high sustained shear loads close to the short-term failure load. The goal of this research project was to investigate the beh...
Article
Several experiments were carried out on reinforced concrete beams without shear reinforcement subjected to high sustained shear loads close to the short-term failure load. The goal was to investigate the behaviour of shear-critical concrete beams under sustained loading. The beams were subjected to the load for a minimum period of three months. Mea...
Article
Full-text available
The ModelCode 2010 allows the analyst to perform a nonlinear analyses for the design or re-examination of concrete structures since 2012. Before 2012 only level I, the partial factor level, which is also recommended in the Eurocode serie, was used in practical engineering. Re-examination of existing structures needs more then only the partial facto...
Article
The design shear resistance of an existing structure can be evaluated with analytical design procedures and numerical procedures provided by non-linear finite element analyses. The new fib Model Code 2010 proposes different calculation methods that fall into four different levels of approximation. As the level of approximation rises, so the complex...
Article
Long-term tests on large-scale Concrete beams without shear reinforcement, which are tested for more than two years under sustained loading close to the ultimate shear capacity (load ratio ranging from 87% to 95%) under climate controlled condition, show that sustained loading has no significant effect on the shear capacity. Although many flexural...
Article
Full-text available
The experimental program presented in this paper deals with the influence of the spatial variation of the concrete strength in width direction on the shear capacity of one way slabs. Two test series are designed, in which the spatial variation of the concrete strength is exaggerated. The influence of the concrete strength variation on the inclined...
Article
Full-text available
The paper presents a research program dealing with the shear capacity of existing solid slab bridge decks without shear reinforcement. The widely applied design formula in Eurocode regarding beam structures without shear reinforcement is evaluated as a reference. The research program is subdivided into several test series. The research topics inclu...
Article
Full-text available
Due to an unfortunate turn of events this article is published on the preceding pages with an erroneous version of Eq. 12. Please find below the correct Eq. 12 that should be regarded by the reader as the final version. (Formula presented).
Article
Under sustained loading, the propagation of cracks in concrete is assumed to be related to the elastic deformation, material parameters and time. Based on the fictitious crack model (FCM), a finite element method is proposed to explain the behavior of cracks in time using current constitutive relations to approximate the time-dependent crack strain...
Article
According to the new fib Model Code 2010 the design shear resistance of a reinforced concrete (RC) structure can be evaluated through analytical and numerical calculation methods that fall into four different levels of approximations; the complexity and the accuracy of the calculated shear resistance increases with increasing the level of approxima...
Article
Energy consumption and CO2-emission of concrete can be reduced when cement is replaced by secondary materials such as residual products from other industries. However, for the design of such environmentally friendly concretes, predicting its performance is very important. In this article a cyclic design method is presented, which can predict the st...
Article
For the design of defined-performance concrete, predicting the material properties of concrete becomes more and more important. To be able to select the right type of fillers and control the water demand in such mixtures, an extension to the compressible packing model was developed to optimize the particle packing of aggregates as well as powders i...
Article
Optimizing concrete mixtures with regard to cement content is one of the most important solutions in sustainable concrete design. Workability of these low cement content or ecological mixtures is very important. Eleven mortar mixtures are presented, which show how a higher packing density can be used to obtain mixtures that require less water. High...
Article
Full-text available
Ecological concrete can be designed by replacing cement with fillers. With low amounts of cement it becomes increasingly important to control the water demand of concrete mixtures. In this paper a cyclic design method based on particle packing is presented and evaluated on the basis of experiments on cement pastes combined with quartz powder. The p...
Article
Full-text available
In this paper a brief overview on the effect of tension stiffening in normal strength concrete and High Performance Fiber Concrete (HPFC) is given. On the basis of an existing model, several simplifications are proposed to describe the post-cracking performance of HPFC, and a simplified model for practical application is developed. This model is va...
Article
Full-text available
In order to gain a better understanding of the complex structural lining behaviour of bored tunnels in the soft Dutch soil, a test set-up has been developed at Delft University of Technology. In this facility a full-scale model has been subjected to construction and serviceability loading conditions. Finally, two tests have been performed in which...
Article
Full-text available
Steel fibres are known to enhance the toughness of concrete in compression and in tension. Steel fibres also improve the bond properties between concrete matrix and reinforcing steel bars. In order to investigate the effect of steel fibres on the rotation capacity of reinforced concrete members, four simply supported beams were loaded in three-poin...
Article
Full-text available
Since the beginning of the nineties of the last century numerous viaducts in the Netherlands have been traced that suffer from ASR. Uniaxial tensile tests on cores drilled from the bridge decks sometimes showed a dramatically low tensile strength. Since these decks are not provided with shear reinforcement, the question was raised whether the resid...
Conference Paper
Full-text available
Pull-out tests were performed on 10 mm diameter ribbed bars embedded along three times the bar diameter in 200 mm cubes made of plain and steel fiber reinforced concrete (SFRC) of normal strength (B45). The fiber content was 60 and 120 kg/m3, respectively, the aspect ratio of the fibers was 45 and 80 and the concrete cover was 15, 25, 35 and 95 mm....
Article
Full-text available
A new bond model for ribbed bars embedded in concrete has been developed. The model is based on the confining capacity of the concrete surrounding the bar. This confinement capacity is evaluated with the help of a thick-wailed-cylinder model, with which the relation between the radial displacement and the radial compressive stress at the steel-to-c...
Article
Full-text available
The bond properties of strands are generally studied in connection with pretensioning, where the anchorage of the tendons is achieved by bond. Most research is aimed at the assessment of the transfer length, hence considering the magnitude and distribution of the stresses involved only implicity. These stresses can be resolved into two components:...
Article
Deelproject 3, afschuifdraagvermogen van lichtbeton. Experimenteel onderzoek aan balken met afschuifwapening.
Article
Full-text available
As a result of a number of reasons new interest developed into the use of lightweight aggregate concrete. Within the scope of this development, a modernized code for lightweight concrete had to be written. In order to support this development, a number of research projects have been carried out. The aim of the research was to verify the appropriate...

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