By computing the point flexible matrix of the curved beam element and inverting it,the curved beam element stiffness matrix can be derived by the stiffness translating matrix.

Based on the semi-experience and semi-theory formula,the calculation methods of the T-type rigid connection joints in circular tube structure and the effects of joint flexibility on the structure system are presented.

The nonlinear dynamic response of frames with flexible nodes is analyzed by using a four parameters Richard model to simulate the nonlinear moment and rotation relationship of the nodes and Masing rule to simulate the unloading and reloading seismic behavior.