Crack control according to DAfStb Guideline “Steel Fibre Reinforced Concrete”

The residual tensile strength of steel fibre reinforced concrete (FRC) is determined based on the characteristic residual flexural strength of the performance class L1 (L1 value) and L2 (L2 value). The L1 value is used for the serviceability limit state design (SLS) and the L2 value for the ultimate limit state design (ULS). Nonetheless, the L2 value is used in DAfStb Guideline “Steel Fibre Reinforced Concrete” for the crack control of steel fibre reinforced concrete with reinforcement.

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Fatigue of prestressed tendons

Prestressed concrete members with pre-tensioned tendons are used e.g. in crane runway beams, slabs in industrial constructions, towers of wind turbines, poles or bridges which are subjected to severe dynamic loads with high load cycles. These concrete members need to be designed against fatigue failure, while the fatigue of the prestressing steel is often the decisive failure mode.

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ConJack - Investigation of foundation structures of offshore wind energy power plants on the basis of framework structures made of concrete

Within the joint project “ConJack - Investigation of foundation structures of offshore wind energy power plants on the basis of framework structures made of concrete”, an alternative solution for a foundation should be investigated, which has technical and ecological advantages over existing steel structures (steel jackets, monopiles) for plants in water depths greater than 40 m.

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Effect of mechanical degradation of concrete on shear response of reinforced concrete constructions

The growing load demand on existing bridges together with mechanical degradation of materials under cyclic loading and inherent deficiencies increase the demand on structural assessments. An exact estimation of existing bearing capacities is therefore the aim of these structural assessments. 

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Rules for design and detailing of large diameter bars and high reinforcement ratios – Structural behaviour of compression members and compression splices

Modern structures are increasingly carried out with fewer columns, whose slenderness increase steadily. Due to this circumstance the remaining compression members have to bear higher loads. Hence compression members with large diameter bars are becoming more and more important.

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Innovative, ultra-high performance concrete (UHPC) components reinforced with non-metallic Basalt Fibre Reinforced Plastic Bars (BFRP)

The use of non-metallic Basalt Fibre Reinforced Plastic (BFRP) Bars in extremely durable, thin-walled concrete structures made of ultra-high performance concrete (UHPC), for example in offshore wind energy plants or coastal and harbour structures is investigated within this research project. Components such as columns and beams made of spun concrete are analysed.

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Priority Program 1542 “Concrete Light” (2nd funding period) – Ultra-light, thin-walled hollow concrete members

During the 2nd funding period further theoretical and experimental research on the load conditions shear and torsion will follow. With the results of these investigations basics for the design, construction and manufacturing of ultra-light, thin-walled concrete members under general loads will be available.

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