Research And Application Of The Grillage Method Based On Secondary Development Of ANSYS

With the sustaining and fast development of economy and transportation in our country, bridge constructing has come into a brand new stage. New bridge structures, such as cable-stayed bridge,suspension bridge,curved box grider bridge and wide box grider bridge, have put into practice. Gradually, traditional analysis methods based on pole systems and landscape orientation distribution theories could not satisfy the need of engineering design. Therefore, it is necessary to analyze the space internal force and live load effect of bridge structures.Comparing to other commonly used bridge structure analysis methods, grillage method is clear in concept and convenient for understanding and applying. Moreover, its computing has high efficiency and the output results which are simple and accord with current bridge criterions could meet the needs of general design precision. As the space problem transferred into plane problems, the precision and applicability of live-load effect method is determined by load landscape orientation distribution theory .The emphases and difficulties of grillage method application are how to mesh girder and calculate component stiffness. With basic equivalent principles of girder method, this paper has discussed general rules and ways of meshing various bridge deck girders and reckoning component section characteristic equivalent. Then, based on large FEM software ANSYS, this paper has developed a program to the demand of practical engineering design. With tools such as Fortran, C programs and APDL and UFPs in ANSYS, this paper has also written coherent programs to analyze live load effect in space and share data with ANSYS.Finally, the effectiveness and correctness of girder computing program and live load effect program has validated by several exemple...