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Additional load bearing capacity of prestressed hollow core slabs due to membrane action
Due to their efficient design, economic production process and quick installation, prestressed concrete hollow core slabs are frequently used in all kinds of constructions. These prefabricated units are typically installed as single span elements, which are at the joints tied to the neighbouring elements with additional rebars. In a final step, the joints at the edges and between the elements are filled with grout, or a second layer of cast in-situ concrete is added on top of the elements. Although the execution of the joints and the stiffness of the surrounding structure provide a certain level of rigidity, hollow core slabs are typically designed as simply supported single span elements. However, the stiffness of the surrounding structure might facilitate compressive membrane action, which can increase the bearing capacity of the elements. This additional load bearing capacity, which is usually not taken into account, can be beneficial in accidental loading situations. This paper evaluates the additional load bearing capacity of prestressed concrete hollow core slabs due to compressive membrane action using two detailed 3D non-linear finite element models in Abaqus. The influence of the longitudinal restraint forces on the load bearing capacity of a single hollow core element is evaluated and compared to a simply supported configuration. The influence of the element geometry and span to height ratio on the additional load bearing capacity is investigated for both reinforced and prestressed hollow sections.
Additional load bearing capacity of prestressed hollow core slabs due to membrane action
Due to their efficient design, economic production process and quick installation, prestressed concrete hollow core slabs are frequently used in all kinds of constructions. These prefabricated units are typically installed as single span elements, which are at the joints tied to the neighbouring elements with additional rebars. In a final step, the joints at the edges and between the elements are filled with grout, or a second layer of cast in-situ concrete is added on top of the elements. Although the execution of the joints and the stiffness of the surrounding structure provide a certain level of rigidity, hollow core slabs are typically designed as simply supported single span elements. However, the stiffness of the surrounding structure might facilitate compressive membrane action, which can increase the bearing capacity of the elements. This additional load bearing capacity, which is usually not taken into account, can be beneficial in accidental loading situations. This paper evaluates the additional load bearing capacity of prestressed concrete hollow core slabs due to compressive membrane action using two detailed 3D non-linear finite element models in Abaqus. The influence of the longitudinal restraint forces on the load bearing capacity of a single hollow core element is evaluated and compared to a simply supported configuration. The influence of the element geometry and span to height ratio on the additional load bearing capacity is investigated for both reinforced and prestressed hollow sections.
Additional load bearing capacity of prestressed hollow core slabs due to membrane action
Thienpont, Thomas (Autor:in) / De Corte, Wouter (Autor:in) / Caspeele, Robby (Autor:in) / Zhao, Bin / Lu, Xilin
01.01.2020
Concrete structures for resilient society, Proceedings of the fib symposium 2020 ; ISSN: 2617-4820 ; ISBN: 9782940643042
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
DDC:
690
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