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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。
Taking a 240m irregular shaped reinforced concrete chimney as a background, a three-dimensional finite element model was established and modeled. Then the chimney was calculated by using incremental incremental time-history dynamic analysis (IDA) The method includes the following steps: selecting suitable ground motion parameters to carry out stepwise amplitude modulation analysis, obtaining IDA curve under horizontal earthquake, and according to the performance point, the structural response trend and corresponding weak parts are analyzed to comprehensively analyze the seismic performance of the structure. The results show that the chimney structure can meet the seismic fortification requirements of rare earthquakes of degree 7, and the seismic performance of the chimney can be further improved by improving the cross-section of the tunnel, reinforcing the reinforcement of the tunnel and increasing the thickness of the superstructure. This study provides some reference and reference for the construction and design of shaped chimney in high intensity areas.