Restoring force models（RFM）in sectional level can meet both computational accuracy and efficiency

it is extensively applied to beam-column element.However

the current sectional RFM

which is specified by′axial force-bending moment-curvature′cannot account for axial force and bending moment（AFBM）coupling flexibly

other RFMs based on yield surface（YS）did not consider strengthening effect.In this paper

the sectional kinematic-strengthening restoring force model considering AFBM coupling and its integration method is proposed.Firstly

the sectional kinematic-strengthening restoring force model is built based on YS.Secondly

the state of the section is determinated and the constitution relation is integrated according to plastic theory.Finally

the static cycle analysis of a cantilever column was implemented.The results show that:（1）the proposed RFM can well account for AFBM interaction

（2）the RFM based on extending YS is characterized by kinematic strengthening.（3）the computational accuracy of the proposed RFM is close to that of the fiber model with uniaxial material constitutive relation.