Analysis of RC structures with different design mistakes under explosive based demolition

Abstract

Most of the RC buildings in Turkey have reached the end of their economic lifespan, so urban transformation studies have been accelerated in recent years. Considering the fact that these buildings do not meet the construction regulations and have structural defects in terms of earthquake resistance is concluded the necessity of renewal of this building stock. For this reason, it is needed to study the explosive based demolition technique, which have been widely used in the future in Turkey. The aim of this study is to analyze the structural behavior of buildings planed for demolition by using explosive materials and demonstrating the effect of structural faults on the demolition process. In this context, the effect of structural defects on structural behavior is investigated under explosive based demolition for a typical RC framed building model. Within the scope of the study, it is aimed to investigate the effects of design errors frequently encountered in reinforced concrete structures during the demolition of the building using explosives. The main objective of the study is to determine the effects of design errors, which may be present in the building on important results such as demolition of reinforced concrete structures that are planned to be demolished in two different types using an explosive inside or towards a selected direction, distribution of the parts scattered after demolition and the demolition time. In this way, it is aimed to prevent accidents or unwanted demolition patterns that may occur in demolition works of reinforced concrete structures with design errors. A 12‐storey square building in plan with 6x6 axles (5 m axle opening) is selected as a structural system. The selected structure has been designed with Ide Static Structural Analysis Program. The same structure is also modeled with extreme loading for structures (ELS) program for low concrete strengths, reinforcement defects, and locally located structural defects considering inside and side demolition used explosives. All building models have been subjected to the same blast planning. It is observed that reduced the concrete strength and reinforcement faults shorten the time of destruction of buildings scheduled for demolition by using explosive materials and all the structural defects effect the debris affecting area. It is generally concluded that, all the structural defects are affective on the structural behavior of buildings under explosive based demolition.