Prestressed hollow core slabs for topped slim floors – Theory and research of the shear capacity. (15th August 2021)

• Record Type: Journal Article
• Authors: Derkowski, Wit; Surma, Mateusz
• Is Part Of: Engineering structures. Volume 241(2021)
• Publication Date: 2021-08-15
• Subjects: Concrete topping -- Finite Element Modelling -- Flexible support beam -- Full-scale test -- Precast hollow core slab -- Slim floor -- Shear capacity; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.112464
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Brief state of the art of the shear capacity of HC unit in Slim Floor. Parametric analysis of design models for the shear capacity of HC unit in Slim Floor. Research on the influence of the flexibility of girders in Slim Floors. Full-scale experimental tests of shear capacity of 12HC slabs and numerical analysis. Additional layer of concrete topping significantly increases shear capacity of HCs. Abstract: This research paper discusses the influence of the flexibility of girders in Slim Floor structures on the reduced load capacity of prestressed HC slabs. The current state of knowledge in the field of the transverse behaviour of hollow core slabs is presented. Contradictory information provided in the literature as well as the computational comparative analysis of the existing theoretical models has demonstrated the need for better recognition of the issue of the effect of reinforced concrete topping layer on the load capacity of HC slabs. The paper includes the presentation of experimental tests, the purpose of which was to reproduce the actual work conditions of hollow core slabs depending on their location on the floor and the numerical analyses supplemented these studies. As a result of the conducted tests and analyses, it was found that the increased flexibility of the support beam resulted in an adverse change in the stress state of the hollow core slab, which may lead to the exceedance of the limit state of shear capacity, while laying an additional layer of structural topping on precast hollow core slabs significantly increased the shear capacity of the floor, and thus safety of the structure. The research also indicates that in all the tested topped elements full composite action up to the failure was shown.