Prediction model for heating rate of section steel during the induction heating demolition process of steel reinforced Concrete：Experimental and numerical analysis

Abstract

Traditional demolition techniques face challenges in effectively separating steel and concrete components of steel-reinforced concrete (SRC) structures. To address this issue, our research group has developed induction heating demolition (IHD) technology, a method allowing for environmentally sustainable and recyclable separation of section steel and concrete. To clarify the underlying mechanisms of the induction heating (IH) process applied to section steel, we undertook experiments on 32 samples of section steel. Our investigations focused on delineating the roles of two key parameters: the heating power (P) and the size of the sections involved. We found the heating rate (V) of the section steel to be significantly influenced by P, in conjunction with the flange and web plate thicknesses. To further unravel the transformations occurring in the steel's internal physical properties throughout the IH process, we devised a numerical simulation approach capable of faithfully replicating the IH process as it applies to section steel. This analysis revealed a diminishing IH efficiency for the section steel, with values declining from 0.7 to roughly 0.4 as the temperature escalated. Utilizing both experimental and numerical data, we formulated a predictive model for the section steel's V, aiming to facilitate the planning stage of IHD implementations. The model exhibits a predictive deviation maintaining a margin within 10 %, demonstrating its substantial reliability. This investigation provides novel strategies to curtail construction waste emissions in building demolition endeavors, thereby presenting a promising avenue toward more sustainable practices in the industry.