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根据已有的对高墩高塔结构地震易损性研究,薄壁高墩在地震作用下容易发生破坏的部位主要位于墩底和墩顶区域;也有文献表明,高墩高塔结构受到自身高阶振型影响,完全损伤发生在距离基础顶面3/4~1/3处.本文在已有研究的基础上,提出不同的钢筋混凝土圆形空心高墩加固方案;考虑环向及纵向碳纤维增强复合材料(Carbon Fiber Reinforced Polymer,CFRP)的布置位置,布置数量及预应力大小等因素,通过动力特性及地震反应谱分析的结果,得到最优的加固方案;进一步通过地震时程分析,进行方案优选,给出钢筋混凝土圆形空心截面高墩的抗震加固的合理方案.结果表明,采用CFRP对圆形空心高墩同时进行环向及纵向加固能提高墩柱的抗震性能,并且纵向CFRP施加的预应力越大,墩柱的抗震性能越好.
According to the existing research on the seismic vulnerability of high pier high-rise structures, the damaged parts of high-rise thin-wall high pier prone to earthquakes are mainly located at the bottom of the pier and the top of the pier. There are also reports that high-rise pier structures are affected by their high-order vibration Type of impact, complete damage occurred in the distance from the base of the top 3/4 ~ 1 / 3. Based on the existing research, this paper proposed different reinforced concrete hollow circular hollow pier reinforcement plan; consider the circumferential and longitudinal carbon fiber reinforced composite According to the dynamic characteristics and the result of seismic response spectrum analysis, the optimal reinforcement scheme is obtained through the arrangement of CFRP materials, the number of arrangements and the magnitude of prestressing force. Furthermore, through the seismic time history analysis, , A reasonable scheme of aseismatic strengthening of high pier with hollow circular hollow section is given.The results show that the use of CFRP to circular and longitudinal reinforcement of circular hollow pier at the same time can improve the seismic performance of pier, The greater the stress, the better the seismic performance of the pier.