Karl-Christian Thienel

Strain-softening of concrete in uniaxial compression

0025-5432/97

Analysis and Design of Sandwich Structures Made of Steel and Lightweight Concrete

Reinforced concrete has been used in ship building for more than 150 years; particularly during war periods with shortage of steel. Unfortunately, this inexpensive material has proven not to be commercially viable, primarily because of added weight. A new concept for design of ships and marine structures has been developed using sandwich plates composed of steel skins with lightweight concrete as core material. New types of light-weight concretes have been developed and tested for this purpose. Very large structures can be built without increasing the core thickness considerably; scalability is achieved by way of a cellular structural concept.

Pullout-Tests mit glatten, dünnen und biegeweichen Stahlfasern

Ein neu entwickelter Versuchsaufbau wurde zusammen mit einer optimierten Schalung genutzt, um auf das Verbundverhalten glatter dunner Stahlfasern zu studieren. Den Schwerpunkt der Untersuchung bildeten Versuche zu verschiedenen betontechnologischen Einflussen wie Wasserzementwert, Flugaschegehalt und die verwendete Gesteinskornung. Letztere ruft neben dem Wasserzementwert die deutlichsten Unterschiede hervor.

Influence of Curing Methods on the Formation of Microcracks in High-Strength Concrete

The microstructure of concrete, especially of High Performance Concrete/High Strength Concrete (HPC/HSC), usually shows many microcracks. The aim of this research project is to investigate the reasons for microcracking in HSC, especially the influence of different curing methods.

Postpeak Behavior of Laterally Reinforced Concrete Panels in Compression-Tension

Complete stress-strain curves were obtained for 56 laterally reinforced high-strength and normal-strength concrete panels that were tested in biaxial compression-tension and uniaxial compression. Such thin elements may represent the response of such structures as shear walls, deep beams, and box girders. The results were compared with observations on similar specimens tested in uniaxial compression in a previous investigation. The study investigated the effect of concrete strength, lateral tensile loading, reinforcement ratio, reinforcing bar spacing, and panel height on strain-softening behavior, final crack formation, compressive strength, and strains at ultimate.