Joost Walraven - Academia.edu (original) (raw)

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Papers by Joost Walraven

Research paper thumbnail of Combined effect of fibers and steel rebars in high performance concrete

In this paper a brief overview on the effect of tension stiffening in normal strength concrete an... more 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 validated using the results of a

Research paper thumbnail of Steel fiber reinforced concrete cylinders under uniaxial compressive loading: preliminary tests

Research paper thumbnail of Prefabrication of Conrete Structures: Proceedings of the International Seminar Delft 1990, Delft, The Netherlands, October 25-26, 1990

Research paper thumbnail of Experimental Study of Shear Capacity of Reinforced Concrete Slabs

Structures Congress 2011, 2011

When assessing the capacity of existing reinforced concrete slab bridges under the increased traf... more When assessing the capacity of existing reinforced concrete slab bridges under the increased traffic loads prescribed in the current codes, shear may become the critical failure mode. To better evaluate the shear capacity of reinforced concrete slab bridges, a series of experiments is carried out on continuous one-way slabs loaded close to the support. Eight continuous slabs of 5m x 2,5m x 0,3m are tested. The loading position is taken at different a/d ratios. Six slabs with a standard concrete mixture and two slabs with a higher strength concrete are tested. The influence of the loading history, the shear span to depth ratio and the concrete compressive strength is discussed. Conclusions on the influence of these parameters on the one-way shear capacity of reinforced concrete slabs are drawn.

Research paper thumbnail of fib Model Code for Concrete Structures 2010: a landmark in an ongoing development

Structural Concrete, 2013

Research paper thumbnail of Shear Capacity of Normal, Lightweight, and High-Strength Concrete Beams according to Model Code 2010. II: Experimental Results versus Nonlinear Finite Element Program Results

Journal of Structural Engineering, 2013

Research paper thumbnail of Time‐Dependent Shear Transfer in Cracked Concrete: Part I

Journal of Structural …, 1991

There is a lack of information about the behavior of cracked concrete subjected to in‐plane susta... more There is a lack of information about the behavior of cracked concrete subjected to in‐plane sustained shear loading. Tests are conducted on 46 push‐off specimens, each provided with a central crack, widths less than 0.10 mm. Cracks usually initiate along the relatively ...

Research paper thumbnail of Parameter-study on the influence of steel fibers and coarse aggregate content on the fresh properties of self-compacting concrete

Cement and concrete research, 2001

Self-compacting concrete (SCC) offers several economic and technical benefits; the use of steel f... more Self-compacting concrete (SCC) offers several economic and technical benefits; the use of steel fibers extends its possibilities. Steel fibers bridge cracks, retard their propagation, and improve several characteristics and properties of the concrete. Fibers are known to significantly ...

Research paper thumbnail of Recommendations for the Shear Assessment of Reinforced Concrete Slab Bridges from Experiments

Structural Engineering International, 2013

Upon assessment of existing reinforced concrete short-span solid slab bridges according to the re... more Upon assessment of existing reinforced concrete short-span solid slab bridges according to the recently implemented Eurocodes that include more conservative shear capacity provisions and heavier axle loads, a number of these structures were found to be shear-critical. The results from recent experimental research on the shear capacity of slabs indicate that slabs benefit from transverse load distribution. Recommendations for the assessment of solid slab bridges in shear are developed on the basis of these experiments. A load spreading method for the concentrated loads is proposed and the applicability of superposition of loading is studied. The resulting most unfavourable position for the design trucks is provided and implemented in the so-called Dutch "Quick Scan" method (QS-EC2). Cases of existing bridges are studied with the previously used QS-VBC as well as with the QS-EC2 that includes the recommendations. As a result of the assumed transverse load distribution, the shear stress to be considered at the support based on the recommendations becomes smaller.

Research paper thumbnail of Combined effect of fibers and steel rebars in high performance concrete

In this paper a brief overview on the effect of tension stiffening in normal strength concrete an... more 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 validated using the results of a

Research paper thumbnail of Steel fiber reinforced concrete cylinders under uniaxial compressive loading: preliminary tests

Research paper thumbnail of Prefabrication of Conrete Structures: Proceedings of the International Seminar Delft 1990, Delft, The Netherlands, October 25-26, 1990

Research paper thumbnail of Experimental Study of Shear Capacity of Reinforced Concrete Slabs

Structures Congress 2011, 2011

When assessing the capacity of existing reinforced concrete slab bridges under the increased traf... more When assessing the capacity of existing reinforced concrete slab bridges under the increased traffic loads prescribed in the current codes, shear may become the critical failure mode. To better evaluate the shear capacity of reinforced concrete slab bridges, a series of experiments is carried out on continuous one-way slabs loaded close to the support. Eight continuous slabs of 5m x 2,5m x 0,3m are tested. The loading position is taken at different a/d ratios. Six slabs with a standard concrete mixture and two slabs with a higher strength concrete are tested. The influence of the loading history, the shear span to depth ratio and the concrete compressive strength is discussed. Conclusions on the influence of these parameters on the one-way shear capacity of reinforced concrete slabs are drawn.

Research paper thumbnail of fib Model Code for Concrete Structures 2010: a landmark in an ongoing development

Structural Concrete, 2013

Research paper thumbnail of Shear Capacity of Normal, Lightweight, and High-Strength Concrete Beams according to Model Code 2010. II: Experimental Results versus Nonlinear Finite Element Program Results

Journal of Structural Engineering, 2013

Research paper thumbnail of Time‐Dependent Shear Transfer in Cracked Concrete: Part I

Journal of Structural …, 1991

There is a lack of information about the behavior of cracked concrete subjected to in‐plane susta... more There is a lack of information about the behavior of cracked concrete subjected to in‐plane sustained shear loading. Tests are conducted on 46 push‐off specimens, each provided with a central crack, widths less than 0.10 mm. Cracks usually initiate along the relatively ...

Research paper thumbnail of Parameter-study on the influence of steel fibers and coarse aggregate content on the fresh properties of self-compacting concrete

Cement and concrete research, 2001

Self-compacting concrete (SCC) offers several economic and technical benefits; the use of steel f... more Self-compacting concrete (SCC) offers several economic and technical benefits; the use of steel fibers extends its possibilities. Steel fibers bridge cracks, retard their propagation, and improve several characteristics and properties of the concrete. Fibers are known to significantly ...

Research paper thumbnail of Recommendations for the Shear Assessment of Reinforced Concrete Slab Bridges from Experiments

Structural Engineering International, 2013

Upon assessment of existing reinforced concrete short-span solid slab bridges according to the re... more Upon assessment of existing reinforced concrete short-span solid slab bridges according to the recently implemented Eurocodes that include more conservative shear capacity provisions and heavier axle loads, a number of these structures were found to be shear-critical. The results from recent experimental research on the shear capacity of slabs indicate that slabs benefit from transverse load distribution. Recommendations for the assessment of solid slab bridges in shear are developed on the basis of these experiments. A load spreading method for the concentrated loads is proposed and the applicability of superposition of loading is studied. The resulting most unfavourable position for the design trucks is provided and implemented in the so-called Dutch "Quick Scan" method (QS-EC2). Cases of existing bridges are studied with the previously used QS-VBC as well as with the QS-EC2 that includes the recommendations. As a result of the assumed transverse load distribution, the shear stress to be considered at the support based on the recommendations becomes smaller.

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