【摘要】 尽管近年来大型换流站阀厅结构越建越多,但是对阀厅结构的易损性研究仍十分缺乏。考虑到大型换流站阀厅结构在电力系统中的重要性,对这类结构易损性开展深入地研究是十分必要的。在数值模型正确性得到验证基础上,对阀厅结构开展在不同类型地震动作用下的增量动力分析(IDA),基于增量动力分析结果建立阀厅结构处于不同破坏状态的地震易损性曲线。研究结果表明当地震动峰值加速度小于0.5g时,阀厅结构刚度降幅比较缓慢,而随着峰值加速度增大,其刚度降幅逐渐增快。由地震易损性曲线可知,在罕遇地震作用下阀厅结构处于不同破坏状态的超越概率均小于5%,该阀厅结构抗震设计满足要求并具有较大安全储备。更多还原

【Abstract】 Although more and more valve hall structures in large-scale converter stations were built in recent years,investigations about the seismic fragility of valve hall structures were still deficiency.Due to the importance of valve hall structures in power system,it is necessary to further study the seismic fragility of this type structure.Based on the verification of the numerical simulation model,the Incremental Dynamic Analysis(IDA) of the valve hall structure was carried out under different ground motions,and the seismic fragility curves of the valve hall structure corresponding to different damage state were established.The results show that the decline of the structural stiffness is gradually increased with the increase of PGA after the PGA value is lager than 0.5g.The exceeding probabilities corresponding to different damage states were less than 5% under the strong ground motions based on the seismic fragility analysis.The seismic design of the valve hall structure meet the requirement of ’no collapse under strong earthquake actions’,and the structure is of sufficient safe margin.更多还原