TY - JOUR

T1 - Duktilitätssteigernde Bewehrungssysteme für fließgefertigte Stabelemente aus UHFB

AU - Markowski, Jan

AU - Meyer, Max

AU - Haist, Michael

AU - Lohaus, Ludger

N1 - Funding Information: Die Autoren danken der Deutschen Forschungsgemeinschaft (DFG) für die Förderung des Projekts „Qualitätsgesicherte Fließfertigung leichter UHFB-Stabelemente mittels Künstlicher Neuronaler Netze“ – Projektnummer 423958617.

PY - 2022/12/8

Y1 - 2022/12/8

N2 - Ductility-increasing reinforcement systems for fabricated column elements made of UHFB. In order to build faster, lighter and more precisely with concrete, a new modular construction concept based on ultra-high performance concrete (UHPC) was investigated, which has a highly advantageous ratio of axial compression load-bearing capacity and dead weight [1]. In order to enable proper manufacturing of this column element, which is referred to as a winding-reinforced UHFB hybrid tube, in an automated extrusion process, a novel reinforcement concept has to be developed without the usual steel reinforcement. In an extrusion process, a supporting inner steel tube is encased with UHPC and advanced together with the UHPC. Subsequently, a ductility-enhancing confinement reinforcement is applied to the surface of the components from the outside in a process that can be automated. As UHPC fragments damage the CFRP reinforcement in case of failure, this paper investigates which protective layer/reinforcement system can be used to achieve ductile component behavior for beam structures subjected to axial compression. For this purpose, different textile reinforcement layers were applied to UHPC specimens and their influence on the load-bearing behavior of the components was determined with special consideration of ductility and residual load-bearing capacity after exceeding the maximum load. A combination of aramide fabric and carbon fiber textile showed favorable load-bearing behavior with enhanced quasi-ductility in experimental investigations.

AB - Ductility-increasing reinforcement systems for fabricated column elements made of UHFB. In order to build faster, lighter and more precisely with concrete, a new modular construction concept based on ultra-high performance concrete (UHPC) was investigated, which has a highly advantageous ratio of axial compression load-bearing capacity and dead weight [1]. In order to enable proper manufacturing of this column element, which is referred to as a winding-reinforced UHFB hybrid tube, in an automated extrusion process, a novel reinforcement concept has to be developed without the usual steel reinforcement. In an extrusion process, a supporting inner steel tube is encased with UHPC and advanced together with the UHPC. Subsequently, a ductility-enhancing confinement reinforcement is applied to the surface of the components from the outside in a process that can be automated. As UHPC fragments damage the CFRP reinforcement in case of failure, this paper investigates which protective layer/reinforcement system can be used to achieve ductile component behavior for beam structures subjected to axial compression. For this purpose, different textile reinforcement layers were applied to UHPC specimens and their influence on the load-bearing behavior of the components was determined with special consideration of ductility and residual load-bearing capacity after exceeding the maximum load. A combination of aramide fabric and carbon fiber textile showed favorable load-bearing behavior with enhanced quasi-ductility in experimental investigations.

KW - aramid

KW - carbon fiber reinforced plastic

KW - ductility

KW - fiber-plastic composite system

KW - load-bearing behavior

KW - ultra-high strength concrete

UR - http://www.scopus.com/inward/record.url?scp=85137046738&partnerID=8YFLogxK

U2 - 10.1002/best.202200062

DO - 10.1002/best.202200062

M3 - Artikel

AN - SCOPUS:85137046738

VL - 117

SP - 998

EP - 1007

JO - Beton- und Stahlbetonbau

JF - Beton- und Stahlbetonbau

SN - 0005-9900

IS - 12

ER -