The present work focuses on the modeling and analysis of mechanical properties of structural steel. The effect of major alloying elements
namely carbon, manganese and silicon has been investigated on mechanical properties of structural steel. Design of experiments is used to
develop linear models for the responses namely Yield strength, Ultimate tensile strength and Elongation. The experiments have been
conducted as per the full factorial design where all process variables are set at two levels. The main effect plots showed that the alloying
elements Manganese and Silicon have positive contribution on Ultimate tensile strength and Yield strength. However, Carbon and
Manganese showed more contribution as compared to Silicon. All three alloying elements are found to have negative contribution
towards the response- Elongation. The present work is found to be useful to control the mechanical properties of structural steel by varying
the major alloying elements. Minitab software has been used for statistical analysis. The linear regression models have been tested for the
statistical adequacy by utilizing ANOVA and statistical significance test. Further, the prediction capability of the developed models is
tested with the help of test cases. It is found that all linear regression models are found to be statistically adequate with good prediction
capability. The work is useful to foundrymen to choose alloying elements composition to get desirable mechanical properties.
A strip yield model implementation by the present authors is applied to predict fatigue crack growth observed in structural steel specimens under various constant and variable amplitude loading conditions. Attention is paid to the model calibration using the constraint factors in view of the dependence of both the crack closure mechanism and the material stress-strain response on the load history. Prediction capabilities of the model are considered in the context of the incompatibility between the crack growth resistance for constant and variable amplitude loading.
To promote the application of aeolian sand resources for steel-concrete composite structures, an aeolian sand reinforced concrete column with I-shaped structural steel is proposed in this study. Four specimens are designed and manufactured with different replacement rates of aeolian sand. The seismic behaviour and damage evolution process of the specimens are studied by low-cycle repeated loading tests. Based on the test results, the mechanical characteristics, failure modes, hysteresis curves, skeleton curves, energy dissipation capacity, displacement ductility, and stiffness degradation of the specimens with different replacement rates of aeolian sand are analysed. In addition, the effects of the design parameters on the seismic behaviour of the specimens are also studied. The results show that the indexes of the seismic behaviour can be significantly improved by adding steel. Moreover, a revised damage model is proposed, to better reflect the evolution law of seismic damage of aeolian sand reinforced concrete columns with steel. The proposed model can provide an important reference for seismic damage assessment of the columns.