The Mechanical Analysis Of Transfer Beam In Well Tower Structure

Based on the shaft tower of Menkeqing as the background,in this project,the well bottom smoke column of conversion girder design for steel reinforced concrete transfer beam, and by using the finite element software SAP2000 the steel reinforced concrete transfer beam and transfer beam supporting the upper part of the frame member under horizontal and vertical load of the internal force change on the static elastic analysis, and the ground under the framework, in comparison with the corresponding parts of the component internal force analysis and summary the internal force variation law of transfer beam and the upper frame, so as to explore reduce internal force of the transfer beam stiffness adjustment scheme of the frame components;And byusing the finite element software ABAQUS long-span steel reinforced concrete transfer beam mechanical performance under the vertical and horizontal load of quasi static elastoplastic analysis research, and study the steel web plate thickness, reinforcement ratio, steel protective layer thickness on the stress influence the performance of the transfer beam.Get the following conclusion can be used for reference in the shaft tower structure design:⑴Compared with the ground framework, the internal force of transfer beam’supper frame memberhas a tendency to focus in the direction of side column,particularly a layer which attached directly to the transformation layer, should be attention in the design of parts.Under horizontal load, with theincreas of upper frame’slateral, the internal force of the upper frame member also has a larger increase.⑵For a long-span transfer beam structure system,by increasing the stiffness of upper frame’sside beam and side column can effectively reduce the internal force of the transfer beam, by increasing the stiffness of the upper frame’s middle column did not significantly reduce the internal force of the transfer beam. ⑶Under the vertical load, the column transform beam at the top of the compressive stress decreases in the direction of beam end, and in the end only a small scale co ncrete in tension;Transfer beam tensile stress at the bottom of the beam end direction gradually decreases, and in the end only a small scale compression of concrete.Steel reinforced concrete transfer beam near the beam end part is mainly composed of longitudinal reinforcement and stirrup to shoulder the responsibility of the internal force in the cross direction is mainly composed of steel for internal force.To meet under the condition of transfer beam deflection and bearing capacity, increase the steel protective layer thickness properly, can improve the ductility of the transfer beam and the mechanical properties,Steel flange width smaller influence on the ductility of the transfer beam. ⑷Once in the need to reduce conversion beam deflection and enhance the bearing capacity of transfer beam, priority should be given to increase the thickness of the steel web plate to improve the mechanical properties of the transfer beam, but increase the ductility of the steel transfer beam web thickness, increases to a certain extent, can cause "strong beam weak column", go against earthquake. ⑸Being supplied to improve the transfer beam reinforcement ratio, can reduce the ductility of transfer beam, adverse to the aseismic, easy cause steel beam-column node construction difficulties;Appropriate increase of transfer beam reinforcement ratio, can improve the bearing capacity of transfer beam, is advantageous to the steel and the work performance of the longitudinal reinforcement.