Abstract
This paper’s objective is to provide simple design relations for the reinforced concrete slabs by a hybrid reinforcing of uniaxial or triaxial geogrids in addition to steel rebars. We hope this can provide guidance for further researchers to estimate the flexural bending capacity of the concrete slabs, the necessary grade of uniaxial or triaxial geogrids, and the necessary count of uniaxial or triaxial geogrids’ layers by conducting first-principles analytical, quantitative analyses for a previously published concrete slabs’ experimental data of reinforced concrete slabs by hybrid reinforcing of steel rebars and uniaxial or triaxial geogrids. Throughout this paper, simple design relations were added to estimate the concrete slabs’ experimental moment at the post-peak load based on the assumption that the uniaxial or triaxial geogrids’ tensile force (as concrete slab’s reinforcement) is equal to its peak tensile strength (obtained by the experimental axial tensile test). This resulted in a variance that frequently has a range of ±10% when compared with the actual experimental data. For more accuracy, simple design relations were added to estimate the uniaxial or triaxial geogrids’ characteristic tensile force at the post-peak load, which resulted in an estimated concrete slab’s experimental moment at the post-peak load with a variance that frequently has a range of ±5% when compared with the actual experimental data.
Highlights
The purpose of this paper is to provide a simple design relation to estimating the moment of resistance in the necessary grade of uniaxial or triaxial geogrids and their count of layers for the concrete slabs reinforced by hybrid reinforcing of steel rebars and geogrids by conducting a first-principles analytical, quantitative analysis for previously published experimental data of reinforced concrete slabs by a hybrid reinforcing of steel rebars and geogrids [18]
At the same time, during the experimental axial tensile test, the transverse bars or the integral nodes have free movement, so the carried tensile strength for each geogrids’ rib portions or hexagonal pitches is equal to the total tensile strength
Uniaxial geogrids as concrete slab-reinforcing material carried an approximately equal or greater tensile force in comparison to its experimental tensile strength corresponding to the same strain, which was obtained from the axial tensile test
Summary
Geogrids are one of the polymer materials classified as geosynthetic materials and are made primarily of polymer materials such as polyester, polypropylene, and polyethylene [1]. They are used in special civil works and infrastructure for stabilization and reinforcement [2]. The use of geogrids as reinforcing material has since extended to pavement systems, for reinforcing materials for asphalt layers as stabilization material for unbound layers [3], as an inter-layer system for the applications of pavement overlays [4], as a reinforcing material for shrinkage in Portland cement concrete [5,6], as a concrete pavement reinforcing material [7] and as an inter-layer system for mitigating the reflective cracking of concrete overlays [8,9] or for mitigating the reflective cracking of the asphalt overlays placed over jointed rigid pavements [10,11]
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