长周期地震下错层隔震结构响应研究
西南林业大学, 土木工程学院, 云南昆明 650000
| 摘 要： | 错层隔震结构是由基础隔震结构发展而来的一种新型的隔震结构，目前在山地掉层结构中应用十分广泛，在普通地震下有良好的隔震效果。但在很多地区存在长周期地震动问题，在云贵川山地地区中也有发现。结构自振周期的延长与长周期地震动低频部分可能引发的共振不容忽视，长周期地震下错层隔震结构响应研究还不完善。建立了两个不同的错层隔震结构有限元模型，节选了六条地震波，在有限元软件SAP2000中进行了普通地震动和长周期地震动（包括近断层脉冲型长周期地震动和远场类谐和长周期地震动）下的非线性时程响应分析。结果表明：错层隔震结构周期延长，总体地震响应减小，有一定隔震效果；在长周期地震动作用下，错层隔震结构的层间剪力、支座位移和层间位移角等比普通地震波有所增大；在远场类谐和地震动作用下，结构支座位移、层间剪力、结构出铰量和结构应力明显区别于近断层脉冲型地震作用，并且两个结构存在显著差异。山地错层结构具有竖向刚度不均匀的特点，结构薄弱位置位于接地层附近，工程中应给予更多关注。 |
| 关 键 词： | 防灾减灾工程; 长周期地震动; 非线性时程响应分析; 错层隔震结构; 减震性能 |
| DOI： | 10.57237/j.se.2022.01.004 |
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收稿日期: 2022-10-28
接受日期: 2022-12-01
在线出版日期: 2022-12-15
Study on Seismic Response of Staggered Story Isolated Structure Under Long-period Earthquake
School of Civil Engineering, Southwest Forestry University, Kunming 650000, China
| Abstract: | The staggered story isolated structure is a new type of isolated structure developed from the base isolated structure. It has great isolation performance under ordinary earthquakes. However, the problem of long-period earthquakes exists in many areas. The prolongation of the natural vibration period of the structure and the resonance caused by the low-frequency part of the long-period earthquakes should not be ignored. The research on the response of the staggered story isolated structure under the long-period earthquake is not perfect. Two finite element models of staggered story isolated structure were established and non-linear time-history response analysis were carried out under ordinary earthquakes and long-period earthquakes, which including near-fault pulse-type long-period earthquakes and far-field harmonic-like long-period earthquakes. Results show that the natural vibration period of the staggered story isolated structure is prolonged, the seismic response is reduced. Under long-period earthquakes, the story drift angle, bearing displacement, story shear, plastic hinges and stress damage of staggered story isolated structure are partly larger than those of ordinary earthquakes. Under the far-field harmonic-like earthquakes, isolation performance is significantly different from those under the near-fault pulse-type earthquakes. And there are significant differences between the two models. The structure has the characteristics of vertically irregular structures and the weak position of the structure is located near the isolation layer, so more attention should be paid to the project. |
| Keywords: | Disaster Prevention and Mitigation Engineering; Long-period Earthquakes; Non-linear Time-history Response Analysis; Staggered Story Isolated; Isolation Performance |
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