中文摘要：

基于增量动力分析法,对高耸钢筋混凝土烟囱结构的抗倒塌性能进行了概率性分析,得到了结构的侧向倒塌地震易损性曲线,定量评价了烟囱结构的抗倒塌能力和抗倒塌安全储备。为了探讨土-结构相互作用对烟囱结构倒塌能力的影响,提出了适用于烟囱结构的土体-基础-上部结构共同工作的整体非线性有限元分析模型。研究表明：在7度罕遇地震（PGA=0.22 g）下,该烟囱结构发生倒塌的概率几乎为0%,能够满足规范规定的＂大震不倒＂的要求。不考虑土-结构相互作用与考虑土-结构相互作用的结构平均抗倒塌能力分别为PGA=2.16 g和PGA=1.34 g,相应的结构倒塌安全储备系数分别为9.82和6.09。两种情况下,虽然烟囱结构的抗倒塌安全储备都比较大,但是土-结构相互作用显著削弱了结构的抗倒塌能力,其降低幅度达38%,因此,对于高耸钢筋混凝土烟囱,在进行抗地震倒塌分析时必须考虑土-结构相互作用。该文的研究结果可为烟囱抗震设计和地震风险评估提供理论依据。

英文摘要：

The seismic collapse resistance capacity of a typical tall reinforced concrete（RC） chimney is studied within the probabilistic framework. On the basis of the incremental dynamic analysis（IDA）, the lateral collapse fragility curves are derived and the collapse performance of the reference chimney is evaluated. In order to investigate the effects of soil-structure-interaction（SSI） on the collapse probability, a detailed integral soil-foundation-superstructure model is presented. The numerical study indicates that the collapse probability of the reference chimney is close to 0% and can meet the collapse resistance requirement under the 7-degree rarely-occurred earthquake with a peak ground acceleration（PGA） of 0.22 g. The median collapse capacity are PGA=2.16 g and 1.34 g for the cases with and without considering the SSI effects,and the corresponding structural collapse margin ratio（CMR） are 9.82 and 6.09, respectively. Even though the CMRs are generally large for both cases, the SSI reduces the collapse capacity of the RC chimney by 38%. It is suggested that the SSI effect should be considered in order to systematically evaluate the collapse performance of high RC chimney structures. The results obtained in this paper for the RC chimney are expected to be helpful for seismic risk assessment, seismic retrofit and could be used for performance-based design of RC chimney structures.