【作者】 张小清；

【导师】 刘桂秋； 舒兴平；

【作者基本信息】 湖南大学 ， 结构工程， 2006， 硕士

【摘要】 本文利用有限元程序ABAQUS 6.5-1对钢框架—钢筋混凝土核心筒混合结构的受力性能进行研究。首先计算三个平面结构在顶层水平位移作用下的结构反应,把混合结构与钢筋混凝土结构、纯钢结构进行对比分析,研究不同材质结构体系的混合给受力性能带来的改变。然后模拟分析了一个典型的空间高层钢框架—钢筋混凝土核心筒混合结构,分别对它施加顶层单调水平位移、循环位移、基底水平地震作用,并且考察钢梁—钢筋混凝土筒体的连接形式、筒体配筋、以及钢材牌号的影响。分析表明:①这种结构体系综合了钢筋混凝土结构和钢结构两者的优势,受力前期有较大的抗侧刚度,后期有很好的变形能力和持荷能力,因此表现出较好的抗侧性能。②结构受力性能在屈服前、后分别由钢筋混凝土结构部分、钢结构部分占主导地位。③钢框架部分能起到抗震设计要求的二道防线的作用。④结构具备较强的能量吸收和耗散的能力,有利于抗震。⑤钢梁与筒体铰接使得结构的抗侧刚度有所减弱,屈服荷载减小较多。⑥加大筒体配筋的影响不大,主要是整体刚度有所增强,强度变化很小。⑦提高钢材牌号对结构屈服以后的影响较大,极限承载力增加了很多,钢柱所承担的水平反力份额有所提高。筒体在受力初期承担了绝大部分的水平剪力和倾覆力矩,导致筒体首先开裂。筒体的刚度下降之后,抵抗水平作用的重心逐渐向钢框架转移,到结构屈服时钢柱承担了约一半左右的水平剪力和倾覆力矩。筒体开裂后并没有因外框架刚度不足导致整个结构变形过大而引起结构迅速破坏。最后,根据它的受力特点,对它的实际应用提出建议,并对进一步的研究提出设想。更多还原

【Abstract】 This paper utilized the ABAQUS 6.5-1 FEA program to study the mechanical character of steel frame-RC corewall hybrid structure. At First computed the response of three plane structures when a lateral displacement was acted on their roof, and compared the hybrid structure with the RC structure and the steel structure, to research the change of the mechanical property which was caused by the hybrid of different material structure system. Then simulated and analyzed a classical spacial high-rising steel frame-RC corewall hybrid structure as it carried three kind of actions singly, which were monotone/cyclic lateral displacement on the roof and lateral earthquake action on the base, and the influence of the connection between steel beam and RC corewall, the reinforcement of corewall and the level of steel were taken into account.The analysis indicated:①This kind of structure system integrates the advantage of RC structure and steel structure. At the earlier stage of load it has greater lateral stiffness, and at the later stage it behave better ability of deformation and load endurance, so it possesses better capability to resist the lateral action.②Its mechanical character is dominated by the part of RC structure or steel structure respectively before or after the structure yielded.③The part of steel frame can play the role as the second line in the resistance.④The structure has better capacity to absorb and dissipate energy, which is profitable for seismic fortification.⑤The join connector between steel beam and RC corewall will lead decrease in structure yield load and lateral stiffness.⑥When the reinforcement of corewall is increased, the stuctrue stiffness will increase also.⑦When the level of steel is raised, the structure maximum load has a greater increase.At the earlier stage of load the corewall carries most part of shearing force and overturning moment, and it leads the corewall to crack. After the stiffness of corewall decreases, the steel frame becomes more important to resist the lateral action. When the structure yields, the steel frame bares about half shearing force and overturning moment. The crack of corewall does not cause the structure collapse rapidly.In the end, according to its mechanical character, some suggestions were made for its practical usage and the farther study.更多还原