A new flexibility-based nonlinear finite element model that considers shear deformation and coupled flexural-shear effects is proposed in this article. Cyclic loading tests of T-shaped and L-shaped shear wall specimens were conducted to verify the validity of the proposed model. All specimens exhibited a flexural failure mode characterized by the crushing of the concrete and the buckling of the reinforcement at the free web boundary. Closer stirrups and longer confined boundary elements should be used in the free web end to prevent premature failure when compressed. The seismic design of the boundary element at the web-flange junction could be relaxed, as no concrete spalling was observed at the web-flange junction. The ductility decreased as the shear span ratio decreased. The specimens exhibited higher strength and stiffness but lower ductility when the flange was in tension. Numerical simulation of the cyclic loading test of the RC flanged shear wall was conducted based on the proposed model, demonstrating that the model efficiently simulates the nonlinear response of RC flanged shear walls, as proved by satisfactory agreement between the analytical results and the test results.