Stress-Strain Relationships of Lightweight Concrete Containing Nano Silica and Steel Fibers under Compressive Cyclic Loading

Document Type : Research Paper

Authors

1 Saroyeh Institute of Higher Education, Sari, Iran

2 University of Kurdistan, Sanandaj, Iran

Abstract

Modelling and simulation of the response of a structure under different conditions requires statistical data from the material behavior. Concrete, as a non-homogenous material has a complex behavior pattern. The loading condition and the ingredients of mix compositions affect the concrete behavior. In order to accurately predict the structural response of concrete members by finite element analysis, the effect of materials used on the behavior of concrete under various loading conditions should be determined. Hence, this research investigates the improvement of the material properties of lightweight aggregate concrete (LWAC) for structural applications and deals with the effects of nano-silica (NS) and steel fibers on the compressive behaviour of LWAC under cyclic loading. The key parameters of compressive stress-strain curve under cyclic loading, namely reloading and unloading curves, common point, plastic strain, unloading and reloading strains were investigated. Results showed that the cyclic compressive behavior of lightweight concrete was affected by nano-silica and fiber reinforcement. According to the experimental findings, empirical stress- strain models were proposed considering the effects of NS and steel fiber to simulate the structural behavior of concrete. The comparative studies indicated an acceptable agreement between the experimental data and proposed models for cyclic compressive stress-strain curve.

Keywords

References

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