远场类谐和地震动下大底盘单塔楼隔震结构振动台试验研究

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摘要远场类谐和地震动具有长持时、低频成份丰富等特征，后期振动阶段产生多个循环脉冲，类似谐和振动，需分析与验证其对隔震建筑等长周期结构抗震性能带来的不利影响。首先讨论远场类谐和地震动峰值比、持时及反应谱特性。然后设计一个大底盘单塔楼钢框架结构，分别组装为抗震、基础隔震和层间隔震等三种试验模型，以普通地震动与远场类谐和地震动为激励输入，进行单向振动台试验与数值模拟，探讨地震波中的长周期成份与类谐和成份对隔震结构层间位移、楼层加速度、隔震层变形等减震性能的影响，分析塔楼水平向缩进尺寸比例为1:1.5、1:2 、1:2.5和1:3等条件下隔震结构的振动特性。结果表明：远场类谐和地震动作用下的抗震、层间隔震与基础隔震模型的楼层动力响应为普通地震动下结构响应的2-3倍，隔震结构的减震性能也明显劣于普通地震动下的减震性能，隔震层在远场类谐和地震动下的最大变形为普通地震动的3-4倍，易导致隔震支座变形过大而产生破坏；不同的塔楼水平向缩进尺寸比例对隔震结构振动特性并无明显影响。

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	颜桂云1
	方艺文1
	吴应雄2
	肖晓菲1

关键词 ：大底盘隔震结构, 远场类谐和地震动, 振动台试验, 减震性能, 振动特性

Abstract：Far-field harmonic-alike ground motions, in which multiple cycle pulses resembled harmonic vibrations were generated at the later stage of ground motions, were characterized by long duration and rich low frequency components.Its adverse influence on the seismic performance of long-period structures, such as the isolated structures, should be revealed and validated.To this end, the peak ratio of ground motion acceleration, duration and response spectrum characteristics of far-field harmonic-alike ground motions were discussed.Then, a single-tower steel frame structure with a large chassis was designed to form three test models, namely the aseismic structure, base-isolated structure and mid-story isolated structure.One-dimensional shaking table tests and numerical simulations were performed adopting common and far-field harmonic-alike ground motions as its external excitation input.The impacts of long-period components and harmonic-alike components on the story drift, acceleration and isolation layer deformation of these test models were explored.Further, the vibration characteristics of the single-tower isolated structures with horizontal indentation size proportions of 1∶1.5, 1∶2, 1∶2.5 and 1∶3 were examined.The results show that the dynamic responses of the aseismic and isolated structures when subjected to far-field harmonic-alike ground motions are 2-3 times as large as those when subjected to common ground motions, and the seismic-reduction performance under far-field harmonic-alike ground motions are not as good as that under common ground motions.The deformation of the isolation layer is also enlarged 3-4 times, which will result in the destruction of the isolation bearing owing to its excessive deformation.Further, there is no obvious difference in the vibration characteristics of the seismic-isolation structures with different horizontal indentation size proportion.

Key words： seismic-isolation structure with large chassis far-field harmonic-alike ground motions shaking table test seismic-reduction performance vibration characteristics

收稿日期: 2017-04-12 出版日期: 2018-09-15

引用本文:

颜桂云1，方艺文1，吴应雄2，肖晓菲1. 远场类谐和地震动下大底盘单塔楼隔震结构振动台试验研究[J]. 振动与冲击, 2018, 37(18): 86-94.
YAN Guiyun1，FANG Yiwen1，WU Yingxiong2，XIAO Xiaofei1. Shaking table tests on single-tower isolated structures with a large chassis under far-field harmonic-alike ground motions. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(18): 86-94.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I18/86

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