摘 要 本文以门克庆矿井主立井井塔工程为依托，将该井塔底部抽柱方案中的转换大梁设计为型钢混凝土转换梁，并利用有限元软件SAP2000对型钢混凝土转换梁与转换梁所支撑的上部框架构件在水平和竖向荷载下的内力分布变化情况进行静力弹性分析，并与落地框架下相应部位的构件内力相比较，分析并总结转换梁内力及上部框架内力的变化规律，从而探索减小转换梁内力的上部框架构件的刚度调整方案；并利用有限元软件ABAQUS对大跨度型钢混凝土转换梁受力性能进行了竖向和水平荷载下拟静力弹塑性分析研究，研究了型钢腹板厚度、配筋率、型钢保护层厚度等因素对转换梁受力性能的影响，得到以下结论，可供井塔结构设计时参考。 ⑴与落地框架相比，转换梁上部框架构件的内力有向边柱方向集中的趋势，尤其是与转换层直接相连的一层，应该是设计中引起重视的部位。在水平荷载作用下，随着上部框架侧移量的增大，转换梁上部框架构件的内力也有较大增幅。 ⑵对大跨度转换梁结构体系来说，增大转换梁上部框架边梁和边柱刚度能有效降低转换梁的内力，增大上部框架中柱并不能明显地降低转换梁的内力。 ⑶在竖向荷载作用下，托柱转换梁顶部压应力向梁端方向逐渐减小，仅在端部小范围内混凝土受拉；转换梁底部的拉应力向梁端方向逐渐减小，仅在端部小范围内混凝土受压。型钢混凝土转换梁在靠近梁端部位主要由纵向钢筋和箍筋来承担内力，在跨中方向主要由型钢来承担内力。在满足转换梁刚度和承载力的情况下，适当的增大型钢保护层厚度可以改善转换梁的延性及受力性能，型钢翼缘宽度对转换梁的延性影响较小。 ⑷在需要降低转换梁挠度和增强转换梁承载力时，应优先考虑增大型钢腹板厚度的方式来改善转换梁的受力性能，但提高型钢腹板厚度转换梁的延性影响较大。 ⑸提高转换梁的配筋率，会降低转换梁的延性，对结构抗震不利，易造成型钢梁柱节点处的施工困难；适当的增大转换梁配筋率，可以提高转换梁的承载力，有利于型钢和纵筋的共同工作性能。

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 concrete 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.