THE STABILITY OF THE PRESTRESSED CONCRETE FILLED STEEL TUBULAR MEMBER
预应力钢管混凝土组合构件的稳定性研究

The calculating methods of the initial force and effective tensile force of prestressing tendon are given in this paper. The differential equation for the prestressed concrete filled steel tubular member is established, and the formulas for buckling load of the composite members are derived by using the theory of elasticity and the energy principle. On the basis of the strength condition, the limit slenderness ratio is deduced. The numerical examples show that the stability bearing capacity of the prestressed concrete filled steel tubular member exceeding the limit slenderness ratio can be raised by prestressing.