Flexural Capacity and Stiffness of Monolithic Biaxial Hollow Slabs

Abstract

The article presents a research on flexural behaviour of hollow monolithic reinforced concrete slabs. It focuses on the results of experimental investigation into full-size hollow reinforced concrete slabs and analyses their flexural capacity and stiffness. The self-weight of the slabs directly depends on the shape and number of hollows. An increase in the hollowness of a slab significantly reduces the load caused by self-weight. This allows increasing the estimated length of the slab under the same payload. An increase in the amount of hollows of the slab changes the stiffness of the slab cross-section that has a direct impact on slab deflection. Considering the shape of the slab cross-section, theoretical calculations of the flexural capacity and deflection of experimental slabs were made. The design of a new type of slabs and variations in different parameters of the slab experience difficulties in conducting a large amount of experimental tests. Therefore, the initial analysis may apply to numerical simulation. The paper describes the principles of designing a numerical model. The calculations were made using DIANA software. The stiffness and flexural capacity of the hollow slabs were established employing numerical simulation compared to the results of experimental investigations. The findings indicate that numerical simulation can be applied for analysing the stress state of the examined structures.

Punching behavior of BubbleDeck type reinforced concrete slabs

“…The existing research on the BD type RC slabs with RPHS is basically dedicated to their flexural and shear capacity assessed in one‐way prototypes (working like shallow beams), which is not representative of slabs supported on columns …”

“…14 The existing research on the BD type RC slabs with RPHS is basically dedicated to their flexural and shear capacity assessed in one-way prototypes (working like shallow beams), which is not representative of slabs supported on columns. 2,[15][16][17] The present work aims to investigate experimentally the behavior of real scale BD type RC prototypes tested in conditions where only axial load is transferred from the slab to the supporting column. These conditions are representative of slabs supported on internal columns of building structural systems.…”

Investigation of flexural and shear behaviors of biaxial voided slabs containing steel cages

“…Chung et al studied stiffness and flexural strength in biaxial voided slabs using six specimens 210 mm in thickness . Valivonis et al investigated the flexural capacity of two biaxial voided specimens 6,000 mm in length to develop a numerical model using the DIANA …”

“…7 Valivonis et al investigated the flexural capacity of two biaxial voided specimens 6,000 mm in length to develop a numerical model using the DIANA. 8 The shear capacity of a reinforced concrete cross section lacking any shear reinforcement is the sum of different individual bearing mechanisms. More specifically, compression chord action, V c, comp , aggregate interlock action, V c, cr , and the dowel action, V c, D , all contribute to the overall shear capacity of the section (Figure 1a).…”

Evaluation of calculation methods used for estimating the ultimate moment resistance of bridge decks reinforced with frp bars

“…Additionally to reinforcement bars, wires and ropes, FRP can be used in the form of strips, sheets and lamellas. FRP reinforcement can also be applied not only for reinforcing new concrete constructions as internal reinforcement, it can also be used in strengthening the structures as external reinforcement (Aktas, Sumer 2014;Barris et al 2012;Benzaid, Mesbah 2014;Daugevičius et al 2012;Fayyadh, Razak 2014;Lale Arefi et al 2014;Lapko, Urbanski 2015;Marčiukaitis et al 2007;Meisami et al 2013;Mostofinejad, Ilia 2014;Mostofinejad, Moghaddas 2014;Nelson, Fam 2014;Pakrastinsh et al 2006;Serdjuks et al 2003;Skuturna, Valivonis 2014a;Sprince et al 2013;Sundarraja, Prabhu 2013;Szolomicki et al 2015;Valivonis et al 2014). FRP reinforcement, as compared to steel, is lighter, resistant to corrosion, has a higher tensile strength, and is transparent to magnetic fields and electrically nonconductive.…”