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随着科学的进步和生活的需要,建筑的高度越建越高,但是当高度超过一定范围,结构的侧向位移将成为结构的控制目标,结构师们为此设计了很多新的结构体系。在框架—核心筒结构中,通常是通过设置加强层来提高结构的抗侧刚度,使位移符合规范的要求。但是在地震的情况下,加强层附近的结构刚度突变会引发内力剧增,造成结构薄弱层的产生。在地震区设置加强层可采用“变刚度”或“有限刚度”的方法减小刚度和内力的突变,使结构在罕遇地震作用下也可以呈现“强柱弱梁”“强剪弱弯”的延性屈服机制。
With the progress of science and the needs of life, the height of the building is higher and higher. However, when the height exceeds a certain range, the lateral displacement of the structure will become the control target of the structure. Many new structural systems have been designed by the architects. In the frame-core tube structure, the lateral stiffness of the structure is usually increased by providing the reinforcement layer to make the displacement comply with the requirements of the specification. However, in the case of an earthquake, a sudden change in structural rigidity near the reinforcement layer will lead to a sharp increase in internal force, resulting in the production of a weak layer of structure. Stiffening and internal force mutations may be reduced by using “variable stiffness” or “limited stiffness” so that the structure can also exhibit “strong column weak beam” under the influence of rare earthquakes. “Strong shear weak bend ” ductile yield mechanism.