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  卢滔,胡国瑞,何福,郭迅,霍敬妍.近场强震动记录基线校正方法的振动台实验研究[J].震灾防御技术,2017,12(3):625-634, DOI:10.11899/zzfy20170318.

近场强震动记录基线校正方法的振动台实验研究
摘要:    为了获取近场永久位移,通常采用基线校正方法,对近场加速度记录进行基线校正并积分得到永久位移值,但这一结果主观性较强,其可靠性也往往缺乏验证。为了解决这一问题,本文提出了一种能产生包含永久位移振动过程的振动台实验方案,采用振动台加滑动机构的方法,模拟记录到永久位移台站测点的真实振动情况;在实验中分别采用加速度计、摄影测量方法分别直接得到加速度和位移时程,对加速度时程进行基线校正并积分得到位移时程,将其与直接获得的位移时程进行对比,以验证采用基线校正方法的有效性。实验结果表明,在实验室条件下采用现有的基线校正方法校正后,通过积分能得到可以接受的位移时程。
作者单位
卢滔 防灾科技学院, 北京 101601 
胡国瑞 防灾科技学院, 北京 101601 
何福 防灾科技学院, 北京 101601 
郭迅 防灾科技学院, 北京 101601 
霍敬妍 防灾科技学院, 北京 101601 
关  键  词:近场  强震动记录  基线校正  永久位移  振动台实验
DOI:10.11899/zzfy20170318
基金项目:中央高校基本科研业务费专项资金创新团队资助计划项目(ZY20160110),地震科技星火计划项目(XH16002Y),国家自然科学基金(51208108)
收稿日期:2017-05-27
作者简介:卢滔,男,生于1979年。博士,副教授。主要从事工程地震理论和应用研究。E-mail:lutao@cidp.edu.cn
通讯作者:
Analysis on Baseline Correction Method of Strong Motion Accelerogram Recorded on Near-fault Site by the Shaking Table Test
Abstract:      For determining the near-fault site permanent displacement in some specialized methods, near-fault accelerogram was corrected with baseline, and integrated into the displacement time history. The above result is often of uncertain and even not easy to be validated because of using the subjective parameters in process. To solve this problem, we proposed a shaking table test scheme to simulate the shake process including the permanent displacement. In the test, a system comprising the shaking table and the specialized sliding mechanism were used to model the actual shake situation on the site recorded the permanent displacement. The accelerogram was recorded by the accelerometer on the sliding mechanism, and the actual displacement time history was achieved on close-range photogrammetry. The displacement integrated by the accelerogram corrected the baseline was compared with the actual displacement to prove the reliability of the correction method. Our results show that the accelerogram could be integrated to the reliable displacement time history under the laboratory condition, after the baseline corrected with the specialized method.
Keywords:  Near-fault site  Strong motion accelerogram  Baseline correction  Permanent displacement  Shaking table test
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