The Seismic Time History Analysis Of Heterotypic Truss-Concrete Frame Hybrid Structure

With the development of economic and social, the public buildings are not only satisfied with the requirements of utility, the demands for beauty has become higher and higher, thus a large number of space truss-concrete frame hybrid structures ermerged. This kind of structures is often of high safety level, once damaged, will cause great harm.Thus, the seismic research of truss-concrete frame hybrid strcture to be more important.Taking a long-span space structure as an example, the upper is a multi curved surface shaped truss, supporting structure is a frame structure, using ANSYS finite element software, mainly for the following aspects to research.Construct the truss roof model, the whole structure model without piles, the whole structure model with piles, analyze their vibration characteristics.Discuss the choice of parameters of the large span space structures under uniform multidimensional seismic excitation time-history analysis, selection of seismic wave, damping ratio selection, focusing on the steel roof in different damping ratio, the influence of nodal displacement and key member forces are analyzed.Using the time-history analysis method, to the three kind of model, the nodal displacements at the roof, the internal forces of the top chords, abdominal rods and bottom chords, bearing reaction force, compare the resluts of them to analyze. Also the influence of structure seismic response under different seismic inputs are discussed. Select some indexes of supporting structure, the bending moment, shear force and axial force of the column column, column equivalent stress, the interlayer displacement, absolute acceleration of the structure, To two kinds of model whether consideration of pile-soil interaction, compare the resluts of the indexes, introduce the reduction coefficient, and discuss whether can reduction,for such a large span structures considering the pile-soil interaction under the seismic action.The results show that,must consider the synergistic reaction between the top and bottom structre,the best choice is using the whole structure model, only considering the fuction of roof, produce the large error.Considering pile soil interaction,the response of various parts of the structure are obvious, especially the horizontal direction. The reduction coefficient of indexes of supporting structure is not the same, for such a large span structure, should not be reduced.