Flexural behavior of assembled monolithic long-span composite beams with CIP reinforced concrete layer atop precast hollow core slabs

Industrialization of construction makes building operation more environmental friendly and sustainable. This change is necessary as it is an industry that demands large consumption of water and energy, as well as being responsible for the disposal of a high volume of waste. However, the transformation of the construction sector is a big challenge worldwide. It is also well known that the largest proportion of the material used in multistory buildings, and thus its carbon impact, is attributed to their slabs being the main contributor of weight. Steel-Concrete composite beams with precast hollow-core slabs (PCHCSs) were developed due to their technical and economic benefits, owing to their high strength and concrete self-weight reduction, making this system economical and with lower environmental footprint, thus reducing carbon emissions. Significant research has been carried out on deep hollow-core slabs due to the need to overcome larger spans that resist high loads. The publication SCI P401, in accordance with Eurocode 4, is however limited to hollow-core slabs with depths from 150 to 250 mm, with or without a concrete topping. This paper aims to investigate hollow-core slabs with a concrete topping to understand their effect on the flexural behavior of Steel-Concrete composite beams, considering the hollow-core-slab depth is greater than the SCI P401 recommendation. Consequently, 150 mm and 265 mm hollow-core units with a concrete topping were considered to assess the increase of the hollow core unit depth. A comprehensive computational parametric study was conducted by varying the in situ infill concrete strength, the transverse reinforcement rate, the shear connector spacing, and the cross-section of steel. Both full and partial interaction models were examined, and in some cases similar resistances were obtained, meaning that the same strength can be obtained for a smaller number of shear studs, i.e., less energy consumption, thus a reduction in the embodied energy. The calculation procedure, according to Eurocode 4 was in favor of safety for the partial-interaction hypothesis.

Download Full-text

Effect of Surface Roughness Characteristics on Structural Performance of Hollow Core Slabs

Materials ◽

10.3390/ma14102610 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2610

Author(s):

Yong-Jun Lee ◽

Hyeong-Gook Kim ◽

Chan-Yu Jeong ◽

Dong-Hwan Kim ◽

Sang-Pil Han ◽

...

Keyword(s):

Surface Roughness ◽

Peak Load ◽

Interface Roughness ◽

Flexural Behavior ◽

Structural Performance ◽

Hollow Core ◽

Cross Sectional ◽

Flexural Performance ◽

Long Span ◽

Effect Of Surface

This study was conducted to evaluate the flexural performance of hollow core slabs (HCS) incorporating the effect of surface roughness. The HCSs are suitable for long span structures due to reduced self-weight. The specimens were HCS with topping concrete and the variables were cross sectional height and surface roughness. The tests were conducted on simply supported beams under four-point loads. The results showed that specimens with interface roughness applied in the lengthwise direction of members exhibited ductile flexural behavior up to peak load than those with interface roughness applied in the member width direction. Their flexural strength was also higher by 1–7% on average, indicating that they are advantageous in improving structural performance.

Download Full-text

FLEXURAL BEHAVIOR OF REINFORCED CONCRETE COMPOSITE BEAMS WITH PRE-CAST UNITS CRACKED DUE TO CONSTRUCTION LOAD : Flexural behavior under sustained loading

Journal of Structural and Construction Engineering (Transactions of AIJ) ◽

10.3130/aijs.67.145_2 ◽

2002 ◽

Vol 67 (557) ◽

pp. 145-152

Author(s):

Zhenbao LI ◽

Yoshiteru OHNO ◽

Hiroaki MINAMI

Keyword(s):

Reinforced Concrete ◽

Composite Beams ◽

Flexural Behavior ◽

Sustained Loading

Download Full-text

Flexural Behaviors of Precast Reinforced Concrete -EPSfoam-Steel Deck Hybrid Panel

Journal of Advanced Civil and Environmental Engineering ◽

10.30659/jacee.4.2.113-122 ◽

2021 ◽

Vol 4 (2) ◽

pp. 113

Author(s):

Mardiana Oesman

Keyword(s):

Reinforced Concrete ◽

Failure Modes ◽

Bottom Layer ◽

Maximum Load ◽

Flexural Behavior ◽

Flexural Test ◽

Concrete Layer ◽

Load Increase ◽

Steel Deck

This paper presented the flexural behavior of the newly developed hybrid panel which included the comparison of the ultimate load, load-deflection behavior, and failure modes. The experimental study was carried out on precast reinforced concrete-EPSfoam-steel deck hybrid panels (CES)� consist of three layers of material : concrete� layer is on the top, the steel deck is located on the bottom layer, and the EPS foam layer as the core. The dimensions of CES are 300 mm x 1200 mm with thickness of concrete layer and EPS foam as variables. The concrete thick were 30 mm and 40mm. The density of EPS foam was 12 kg/m3, 20 kg/m3, and 30 kg/m3. The static flexural test of CES was conducted in accordance with the ASTM C 393-00 standard for determination of flexural strength on concrete, the load was applied at third-point loading. This test was carried out with monotonic static load, deflection control using a loading frame with capacity of 10 kN. The results show that increase the thickness of the concrete layer from 30mm to 40mm with� EPSfoam density of 12 kg /m3, 20 kg/m3, and 30 kg/m3 achieved a maximum load increase of 33.51%; 46,13%; and 37.35%, respectively.

Download Full-text