Simple Design Methodology for R.C. Slabs by Hybrid Reinforcing of Steel Rebars and Uniaxial or Triaxial Geogrids

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.

Keywords

• simple design relations
• reinforced concrete slabs
• hybrid reinforcing material
• uniaxial geogrids
• triaxial geogrids
• steel rebar