（东南大学土木工程学院，  南京  210096）

［摘要］以某高度为240m的异形截面钢筋混凝土烟囱为背景，首先建立三维有限元结构模型，并进行模态分析，然后详细地对该烟囱采用逐步增量时程动力分析（IDA）方法进行计算，具体包括：选择合适的地震动参数进行逐步调幅分析，得到水平地震作用下的IDA曲线，根据性能点明确结构的响应变化趋势以及对应的薄弱部位，从而全面地分析结构的抗震性能。研究结果表明，该烟囱结构满足7度罕遇地震作用设防要求，通过对洞口截面的改善、增强洞口配筋以及增加上部结构截面厚度可以进一步提高烟囱的抗震性能。本研究对于异形烟囱在高烈度地区的建设和设计提供了一定的借鉴和参考。

［关键词］异形烟囱； 逐步增量时程动力分析； 抗震性能

中图分类号：TU355文献标识码：A文章编号：1002-848X(2017)15-0031-05

Seismic performance research of special-shaped chimney structure

Zhu Fengqi, Liu Huanqin

(Department of Civil Engineering， Southeast University， Nanjing 210096， China)

Abstract:A reinforced concrete special-shaped chimney with height of 240m was taken as the background. First, the 3D finite element modeling of the structure was built and the modal analysis was carried out. Then, the gradual incremental time-history dynamics analysis (IDA) method was carried out on the chimney in detail. Suitable ground motion parameters were selected for gradual amplitude modulation analysis to obtain IDA curves under horizontal earthquake action, and structural response change trends and corresponding weak parts were determined according to the performance points, resulting in an overall analysis of the seismic performance of the structure. The research results show that the chimney structure meets the 7 degree fortification requirements under rare earthquake, and the seismic performance of the chimney can be further improved through the improvement of hole cross-section, reinforcement of rebar around holes and increase of cross-section thickness of the structure. This study provides some references and significances for the design and construction of special-shaped chimneys in high seismic intensity areas.

Keywords:special-shaped chimney; gradual incremental time-history dynamics analysis; seismic performance

*江苏省普通高校研究生科研创新计划项目（KYLX_0150）。

作者简介：朱峰岐，博士研究生，Email：fengqizhu_seu@qq.com。