Abstract
The optimized-section precast slab with structural aesthetics (OPS) is a half precast concrete slab with multi-ribs that optimizes the cross-section by eliminating the unnecessary bottom flanges at mid-span and has good structural performance by utilizing prestressing strands and truss-type shear reinforcements. In addition, it is a member that is designed to highlight the structural aesthetics through the curved shape of a variable cross-section at the bottom of the flange which is created from a natural shape that is formed in the section optimization process. In this study, experimental research was carried out to examine the structural performance of the OPS, which includes flexure and shear tests on the precast concrete unit members for resisting construction loads, the composite members with cast-in-place concrete, and the continuous end section. The experiment results confirm that, in accordance with the current design code, the flexural performance of OPS is on the safe side regardless of the member type, whereas the shear performance of the precast concrete unit member differs slightly from that of the composite member due to the differences in the contributions of the shear reinforcement as the effective depth varies.
Highlights
The precast concrete (PC) construction method can reduce construction costs by shortening the construction period and can improve the member quality by prefabricating the members at the factory [1,2,3]
This study developed an optimized-section precast slab with structural aesthetics (OPS) that can reduce the quantity of materials through the efficient configuration of cross-sections, and one that is suitable for long-span implementation as a type of half PC slab
In the CF specimen, which was a composite PC slab member, a slightly larger deflection was measured in the linear variable differential transformers (LVDTs) that was located on the right after the maximum load was reached, and the failure occurred as the critical crack between the right loading point and the tension zone progressed
Summary
The precast concrete (PC) construction method can reduce construction costs by shortening the construction period and can improve the member quality by prefabricating the members at the factory [1,2,3]. Some PC structures, have often had problems with cracks or water leakages in the connections of the PC members due to their lack of integrity. For this reason, a half PC system that typically consists of lower PC parts that are prefabricated in a factory and upper parts that are cast in place has been widely used [6]. Many alternatives have been developed to enhance the load carrying capacity of PC slab members at the construction stage [7,8,9,10] and PC slabs with vertical ribs, such as a modified double tee slab (DTS) and a multi-ribbed slab (MRS), are some examples [11,12,13,14,15]. Many efforts have been made to develop slender half PC members with a long span-to-height ratio (l/h) to maximize space utilization while ensuring efficient structural resistance performance
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