基于抗侧刚度比的混凝土框架结构减震性能分析

Damping Performance Analysis of Concrete Frame Structures Based on Side Stiffness Ratio

【目的】酒店结构常常会因为建筑使用功能的要求首层层高做得很高,随之而来的是首层会出现薄弱层结构在地震作用下必然会在首层应力集中,加剧结构的破坏。【方法】对于这类问题,本研究以实际的酒店工程为例,通过有限元软件ETABS,对纯混凝土框架结构和增加屈曲约束支撑刚度比为0.5、1.0、1.5、2.0的结构建模分析,并按规定选取二条天然波和一条天然波,对其进行动力特性分析及动力响应分析。【结果】从分析中可知,随着抗侧刚度比的增加,结构的层间位移角、楼层位移等都有明显的减小趋势,当抗侧刚度比为1.0时,效果最明显。继续增加抗侧刚度比,结构的动力特性减小不再显著,但顶部楼层的动力响应有增大趋势。【结论】因此,通过合理设置支撑与结构的抗侧刚度比可以实现很好的耗能减震效果。

[Purposes]The hotel structure is often because of the requirements of the building use function of the first layer is high,followed by the first layer will appear weak layer.Under the action of earthquake,the stress concentration in the first layer of the structure will aggravate the failure of the structure.[Methods]For this kind of problem,this paper takes a practical hotel project as an example,through the finite element analysis software ETABS program,the plain concrete frame structure and increase the buckling constraint support stiffness ratio 0.5,1.0,1.5,2.0,the structure of the modeling analysis,and in accordance with the provisions,select two natural wave and natural wave,the dynamic characteristics analysis and dynamic response analysis.[Findings]It can be seen from the analysis that with the increase of the anti-lateral stiffness ratio,the interstory displacement Angle and floor displacement of the structure have an obvious trend of decreasing,and the effect is most obvious when the anti-lateral stiffness ratio is 1.0.With the increase of lateral stiffness ratio,the dynamic characteristics of the structure do not decrease significantly,but the dynamic response of the top floor tends to increase.[Conclusions]Therefore,reasonable setting of the side stiffness ratio between the support and the structure can achieve good energy dissipation damping effect.