CALCULATION METHOD OF SHIRINKAGE CRACK WIDTH IN REINFORCED CONCRETE WALL USING BOND-LOSS LENGTH

Abstract

The crack width due to drying shrinkage of RC members is calculated by integrating a difference of strain of reinforcing steel and concrete along bond loss region. This value is correspond to the multiply of the equivalent bond-loss length(L_b) and the sum of the strain of reinforcing steel and concrete at the crack. If L_b is used, crack width can be simply calculated. In this paper, a parameter study was carried out by the bond analysis to investigate the influence of several variables on L_b, and the estimation equation of L_b was proposed. Parameter study (reinforcing steel ratio, concrete strength and so on) was carried out by using L_b to investigate the effect of crack width due to drying shrinkage.