Some achievements have been gotten by the research of the influence law about connection stiffness and connection position to the structural performance.

By attaching an auxiliary surface between the assembled parts, defining the material properties of the auxiliary surface and connecting the assembled parts with the Multi-Point Constraints(MPC) technique, the practical connecting stiffness of the assembly structure can be simulated .

Finite element analysis of stiffness of connection between steel beam and CFT column with stiffener ring plate;

According to Hook law, the displacement stiffness and rotation stiffness were gotten when spring plank was connected with swing bolsters, different connection stiffness values were obtained by changing spring plank radius.

Research on continuous stiffness mapping of planar parallel 3-DOF manipulator with flexible joints;

were investigated and the influence law of the load on the coupling stiffness and the contact state of the spline joint structure were also investigated.

The paper introduced a method combined finite element analysis and field static test, made a security appraisal to a pin scaffold temporary stand, analyzed how the coupling stiffness between rail and upright stanchion affect the stability ultimate bearing capacity.