基于隔震改造的大型阀厅结构抗震性能评估
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摘要
大型换流站阀厅结构是生命线工程的关键建筑,相关研究表明阀厅结构在地震中损坏导致的功能中断将造成重大的经济损失和社会影响。以规范要求的"小震不坏,中震可修,大震不倒"为设防水准进行抗震设计虽可以保证结构强震下的生命安全,但不能满足现代社会对生命工程震后功能可持续的性能要求。隔震技术能降低地震能量输入的同时控制上部结构的损伤,在提高结构性能水平方面已有成功的实例。为提高阀厅结构性能水平,本文对某大型换流站阀厅结构进行隔震设计,采用ETABS、Perform-3D非线性分析软件对隔震前后阀厅结构进行模态分析和弹塑性时程分析,从结构动力特性、结构响应、结构耗能以及构件损伤等方面对比研究了原阀厅结构和隔震阀厅结构的抗震性能。分析结果表明:基底隔震能有效延长结构的自振周期,减小阀厅结构在地震作用下的基底剪力、顶点位移角;隔震支座耗散50%以上地震能量,使上部结构基本保持弹性状态,显著提升结构抗震性能水平。
Large-scale converter station valve hall structure is one of key structures of lifeline engineering, but researches already show that function failure caused by the destruction of valve hall structures under earthqueak will lead to significant economic losses and serious social impact. Seismic design based on seismic fortification specified by the codes is suitable for the level of safety of life, but not sufficient to guarantee seismic resilience of lifeline engineering after earthquake. Seismic isolation is a promising technique to decrease earthquake energy input and structural damage with many successful engineering applications. To improve earthquake resilience of valve hall structure, a large-scale converter station valve hall structure is renovated using seismic isolation technique. Model analysis and elastic-plastic time history analysis are proceed by using nonlinear FEM software, ETABS and Perform-3 D, to study seismic performances of original valve hall structure and isolated valve hall structure, including dynamic characteristics, structural responses, energy dissipating and component damages. The results show that the natural vibration period is extended effectively, the maximum top displacement angle of superstructure and base shear are significantly reduced by base isolation. More than half of the earthquake energy is dissipated by isolation bearings which keep the valve hall structure elastic and dramatically improve seismic resilience of large-scale valve hall structures under strong earthquakes.
Large-scale converter station valve hall structure is one of key structures of lifeline engineering, but researches already show that function failure caused by the destruction of valve hall structures under earthqueak will lead to significant economic losses and serious social impact. Seismic design based on seismic fortification specified by the codes is suitable for the level of safety of life, but not sufficient to guarantee seismic resilience of lifeline engineering after earthquake. Seismic isolation is a promising technique to decrease earthquake energy input and structural damage with many successful engineering applications. To improve earthquake resilience of valve hall structure, a large-scale converter station valve hall structure is renovated using seismic isolation technique. Model analysis and elastic-plastic time history analysis are proceed by using nonlinear FEM software, ETABS and Perform-3 D, to study seismic performances of original valve hall structure and isolated valve hall structure, including dynamic characteristics, structural responses, energy dissipating and component damages. The results show that the natural vibration period is extended effectively, the maximum top displacement angle of superstructure and base shear are significantly reduced by base isolation. More than half of the earthquake energy is dissipated by isolation bearings which keep the valve hall structure elastic and dramatically improve seismic resilience of large-scale valve hall structures under strong earthquakes.
引文
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[2] 张子引,赵彪,曹伟炜,等.四川汶川8.0级地震电网受灾情况调研与初步分析[J]. 电力技术经济,2008,20(4):1～4
[3] 吴必华,高湛,陈俊,等. ±800kV换流站阀厅结构扭转变形分析[J]. 电力建设,2011,32(11):28～30
[4] 吴嘉欣. 地震作用下带电力设备大型换流站阀厅结构抗倒塌性能研究[D]. 广州:广州大学,2012
[5] 陆祝贤,吴轶,杨春,等. 基于IDA的阀厅结构地震易损性分析[J]. 土木工程学报,2012,45(增刊):263～267
[6] 谭平,周福霖. 隔震技术的研究与工程应用[J]. 施工技术,2008,37(10):5～7
[7] 周云,吴从晓,张崇凌,等. 芦山县人民医院门诊综合楼隔震结构分析与设计[J]. 建筑结构,2013,43(24):23～27
[8] 郭永恒.基础隔震结构基于性能的设计方法研究[D]. 广州:广州大学, 2007
[9] GBJ 50011-2010, 建筑抗震设计规范[S]
[10] CECS160∶2004,建筑工程抗震性态设计通则[S]
[11] FEMA356. Prestandard and Commentary for the Seismic Rehabilitation of Buildings[S]. FEMA,2000
[12] CECS392∶2014 建筑结构抗倒塌设计规范[S]
[13] 史庆轩,杨文星,门进杰.单自由度体系非线性地震能量反应的计算[J].建筑科学与工程学报,2005,22(2):25～29