RESEARCH ON RESTORING FORCE MODEL OF RC COLUMNS STRENGTHENED WITH PRESTRESSED HIGH STRENGTH STEEL WIRE MESH

Based on the experimental results of 16 reinforced concrete (RC) columns strengthened with prestressed high strength steel wire mesh (PSWM) and 2 comparative RC columns under cyclic loadings and constant axial loading, the research of the restoring force model of RC columns strengthened with PSWM was carried out. According to the relevant experimental research, the materials’stress-strain relationships were determined;the stress-strain relationship equations of the reinforced concrete confined and strengthened with PSWM under axial loading were established. Considering the axial force of secondary moment effect, the calculation method of skeleton curves of the strengthened RC columns was presented. The restoring force model was established with Clough hysteresis rules. The research demonstrates that: by choosing the suitable material constitutive relationships and assumptions, and based on the force balance equations and existing simple hysteresis rules, the skeleton and hysteresis curves that agree well with the experimental results can be obtained. The restoring force model is simple, applicable and can be used to design and construction of RC columns strengthened with PSWM.