Method of Combining Virtual Laminated Elements and Bar Elements for Analysis of Prestressed Concrete Bridge Structures

Research actuality and numerical calculation of prestressed concrete structure were evaluated, and a kind of element aiming at prestressed concrete structure analysis was proposed. By the method of transforming the node DOF of the space bar element to the node DOF of the space virtual laminated element, that is, the node of bar element need not fixed on the node of space solid element, the prestressed concrete structure were simulated together. Selective integral method were adopted to calculate element matrix, which can simulate complex sections with less elements. Moreover, independent space bar element was adopted to simulate prestressed strand, which can directly solve the displacement and internal forces of the structure by prestress. It is shown that through prestressed concrete structure analysis by using this kind of element, a comparably accurate result can be obtained even the finite element gridding is sparse. It is a more simple and accurate method than the traditional method of prestress calculating.