钢筋混凝土核心筒基于位移的抗震设计方法研究

Study on Displacement-Based on Seismic Design Method of Reinforced Concrete Core Walls

对于较重要的建筑结构,在基于性能抗震设计过程中,需要同时验算结构的抗震承载力和位移反应是否满足规范规定的限值.混凝土核心筒是我国超高层建筑中应用最为广泛的抗侧力单元,在承载力、刚度和延性方面均需进行详细的设计以满足更高的抗震要求.利用加速度反应谱和能力谱的基本原理,通过引入损伤指标及能力设计方法,本文提出一种混凝土核心筒基于位移的抗震设计方法,该方法可实现对目标位移和加速度(力)的双重控制,对结构进行更为合理的抗震设计.只要给定结构目标位移和目标加速度,即可利用该基于位移的方法进行抗震设计计算,得到混凝土核心筒在任一地震作用水平下的承载力和位移,同时,引入能力设计方法进行定量的构件构造措施设计,以保证构件在大震作用下具有足够的塑性变形能力.

For some important building structures, the structural strength and displacement are verified to comply with the codes or standards limits during the performance-based seismic design process. The concrete core wall is the most widely used lateral force resisting system in high-rise buildings in China. The bearing capacity, stiffness and ductility must be detailed design to meet the higher seismic requirements. Using Park-Ang damage index D and capacity design method, base on the acceleration-displacement response spectrum and the basic principle of capacity spectrum, a displacement-based on seismic design method of reinforced concrete core walls is proposed. This method is considered to be useful to develop a more rational seismic design method because the method makes it possible to verify the seismic safely of a structure from both the force and the displacement. Given both the target displacement and the target acceleration of the structure, the seismic design is proceed by the proposed method. And the demand strength and displacement are obtained in any design level earthquake. In addition, in order to ensure that the members of the core walls structure have enough plastic deformation capacity, the reinforcement in detail is designed by capacity design method.