Cracking state analysis of reinforced concrete grain silos structures
Data publikacji: 12-02-2021
Zeszyty Naukowe Politechniki Częstochowskiej seria Budownictwo 2020;26(1):156–161
Silo structures are classified as objects with a higher degree of risk and disaster hazard compared to other engineering structures. In reinforced concrete silos, the following may occur: excessive cracks or strains, exceeding capacity of the wall or the floor to withstand bending moments and normal forces, corrosion of structural members, or explosions of a part or the whole silo bin. Silo failures may be caused by yet not fully recognized stress and strain states in sections of the silo chambers, which result from random and variable interactions of stored granular media in combination with temperature fields. Circadian fluctuations of ambient temperature that occur particularly during early winter and spring coupled with the static pressure of the granular medium produce overload states in the silo wall structures. As a result, additional tensile stresses combined with bending are produced. All these factors cause increased cracking in reinforced concrete silo walls, which may reduce the load capacity and durability of the silo structure. The paper presents assumptions and design procedures regarding verification of the cracking state in reinforced concrete silo chambers based on the latest recommendations given in EN 1992-3, EN 1992-1-1 and fib Model Code 2010.