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In this study, based on the extended Kalman filter (EKF), an approach is proposed for identifying unknown ground motion time history and structural parameters by using the absolute acceleration measurements. First, the interfacial force of the lower boundary of the 1st floor is considered as the unknown excitation. The EKF-based approach is employed for the identification of this unknown excitation and the remaining structural stiffness parameters. Then, by using Fourier transform, the structural natural frequencies can be obtained from the acceleration measurements and used for identifying structural stiffness of the 1st floor. Finally, based on these identified structural parameters, the unknown interfacial force mentioned above is updated and employed for identifying ground acceleration with the aid of Newmark-β method. The effectiveness of the proposed approach is validated via a numerical frame structure and a five-story experimental model under shaking table tests.
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针对未知地震作用下框架结构的参数识别问题,提出了一种基于扩展卡尔曼滤波(extended Kalman filter,EKF)的地震动时程反演与结构参数识别方法。首先,将首层底板的层间边界力视作未知外激力,利用未知激力下的EKF算法识别此未知激励以及其余层的剪切刚度;其次,采用傅里叶变换,从绝对加速度时程中获取结构基频,进而根据特征方程识别首层刚度系数;最后,基于识别的结构参数,进一步修正未知边界力,并结合Newmark-β法反演地震加速度时程。文中通过5层框架模型数值算例和振动台试验验证了本文算法的有效性。
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1.College of Civil Engineering, Hunan University, Changsha 410000, China), AuthorCompanyExt(id=1245390266832634580, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, companyId=1245390266811663058, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1.湖南大学 土木工程学院,湖南 长沙 410000)]), AuthorCompany(id=1245390266924909276, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, xref=2., ext=[AuthorCompanyExt(id=1245390266933297885, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, companyId=1245390266924909276, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2.Key Laboratory of Wind and Bridge Engineering of Hunan Province, Changsha 410000, China), AuthorCompanyExt(id=1245390266945880799, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, companyId=1245390266924909276, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2.风工程与桥梁工程湖南省重点实验室,湖南 长沙 410000)])], figs=[ArticleFig(id=1245390269026255744, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Fig. 1, caption=
Absolute acceleration responses of the structure under ground motion, figureFileSmall=oHjiF47R3mPpdSilB1n4mA==, figureFileBig=Q2e41qTAwLe/86H0LF8Acg==, tableContent=null), ArticleFig(id=1245390269126919048, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=图1, caption=
地震作用下结构绝对加速度响应信息, figureFileSmall=oHjiF47R3mPpdSilB1n4mA==, figureFileBig=Q2e41qTAwLe/86H0LF8Acg==, tableContent=null), ArticleFig(id=1245390269370188693, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Fig. 2, caption=
Identification results of structural stiffness coefficients, figureFileSmall=f+u/v3BPM+PpqhSNGBxcmw==, figureFileBig=+HTiNzCndgyRqY/9vycuow==, tableContent=null), ArticleFig(id=1245390269487629213, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=图2, caption=
结构刚度系数识别结果, figureFileSmall=f+u/v3BPM+PpqhSNGBxcmw==, figureFileBig=+HTiNzCndgyRqY/9vycuow==, tableContent=null), ArticleFig(id=1245390269588292516, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Fig. 3, caption=
Inversion results of unknown seismic acceleration time history, figureFileSmall=TA9PQp5Vz8MsqO6hbM+zZg==, figureFileBig=/90PEdQgFEHDJHw1aBzRqQ==, tableContent=null), ArticleFig(id=1245390269688955819, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=图3, caption=
未知地震加速度时程反演结果, figureFileSmall=TA9PQp5Vz8MsqO6hbM+zZg==, figureFileBig=/90PEdQgFEHDJHw1aBzRqQ==, tableContent=null), ArticleFig(id=1245390269802202034, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Fig. 4, caption=
Shaking table tests of five-story structural model, figureFileSmall=5lyPG19LouvQmhtEnDisRw==, figureFileBig=DmcJyK174DbABH3RZYCNHQ==, tableContent=null), ArticleFig(id=1245390269898671032, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=图4, caption=
5层框架结构振动台试验, figureFileSmall=5lyPG19LouvQmhtEnDisRw==, figureFileBig=DmcJyK174DbABH3RZYCNHQ==, tableContent=null), ArticleFig(id=1245390269986751422, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Fig. 5, caption=
Identified stiffness coefficients of the structural model in the lab, figureFileSmall=5H0K/bd6acSUfu04Yej11w==, figureFileBig=5ICPapSA0jwcadUrCRAWEw==, tableContent=null), ArticleFig(id=1245390270066443203, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=图5, caption=
实验室结构模型层间刚度识别结果, figureFileSmall=5H0K/bd6acSUfu04Yej11w==, figureFileBig=5ICPapSA0jwcadUrCRAWEw==, tableContent=null), ArticleFig(id=1245390270188078025, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Fig. 6, caption=
Identification results of seismic acceleration time history, figureFileSmall=KmYx7kkNVgMnRkrdqy7mTA==, figureFileBig=sF46OwTNPM7MCF4j9m9tOw==, tableContent=null), ArticleFig(id=1245390270284547022, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=图6, caption=
地震加速度时程识别结果, figureFileSmall=KmYx7kkNVgMnRkrdqy7mTA==, figureFileBig=sF46OwTNPM7MCF4j9m9tOw==, tableContent=null), ArticleFig(id=1245390270397793238, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Table 1, caption=
Identification results of structural parameters of the numerical model (3% noise)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 真实值 | 识别值 | 误差/% |
|---|
| Kobe波 | El Centro波 | Kobe波 | El Centro波 |
|---|
| k1/(kN/m) | 120 | 116.30 | 114.80 | -3.06 | -4.35 |
| k2/(kN/m) | 120 | 118.50 | 119.20 | -1.26 | -0.68 |
| k3/(kN/m) | 120 | 117.70 | 120.10 | -1.93 | 0.12 |
| k4/(kN/m) | 120 | 121.90 | 120.60 | 1.62 | 0.51 |
| k5/(kN/m) | 120 | 119.60 | 119.70 | -0.34 | -0.28 |
| ξ1/% | 3 | 2.87 | 3.19 | -4.67 | 6.40 |
| ξ2/% | 3 | 2.95 | 3.09 | -1.33 | 3.09 |
), ArticleFig(id=1245390270473290715, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=表1, caption=
数值模型结构参数识别结果(3%噪声)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 真实值 | 识别值 | 误差/% |
|---|
| Kobe波 | El Centro波 | Kobe波 | El Centro波 |
|---|
| k1/(kN/m) | 120 | 116.30 | 114.80 | -3.06 | -4.35 |
| k2/(kN/m) | 120 | 118.50 | 119.20 | -1.26 | -0.68 |
| k3/(kN/m) | 120 | 117.70 | 120.10 | -1.93 | 0.12 |
| k4/(kN/m) | 120 | 121.90 | 120.60 | 1.62 | 0.51 |
| k5/(kN/m) | 120 | 119.60 | 119.70 | -0.34 | -0.28 |
| ξ1/% | 3 | 2.87 | 3.19 | -4.67 | 6.40 |
| ξ2/% | 3 | 2.95 | 3.09 | -1.33 | 3.09 |
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Identification results of the structural parameters of the numerical model (5% noise)
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| 参数 | 真实值 | 识别值 | 误差/% |
|---|
| Kobe波 | El Centro波 | Kobe波 | El Centro波 |
|---|
| k1/(kN/m) | 120 | 118.64 | 116.89 | -1.13 | -4.59 |
| k2/(kN/m) | 120 | 116.64 | 117.21 | -2.80 | -2.32 |
| k3/(kN/m) | 120 | 116.34 | 119.07 | -3.05 | -0.77 |
| k4/(kN/m) | 120 | 121.97 | 120.86 | 1.65 | 0.72 |
| k5/(kN/m) | 120 | 119.94 | 119.75 | -0.05 | -0.21 |
| ξ1/% | 3 | 3.23 | 3.22 | 7.52 | 7.36 |
| ξ2/% | 3 | 3.16 | 3.21 | 5.44 | 6.85 |
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数值模型结构参数识别结果(5%噪声)
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| 参数 | 真实值 | 识别值 | 误差/% |
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| Kobe波 | El Centro波 | Kobe波 | El Centro波 |
|---|
| k1/(kN/m) | 120 | 118.64 | 116.89 | -1.13 | -4.59 |
| k2/(kN/m) | 120 | 116.64 | 117.21 | -2.80 | -2.32 |
| k3/(kN/m) | 120 | 116.34 | 119.07 | -3.05 | -0.77 |
| k4/(kN/m) | 120 | 121.97 | 120.86 | 1.65 | 0.72 |
| k5/(kN/m) | 120 | 119.94 | 119.75 | -0.05 | -0.21 |
| ξ1/% | 3 | 3.23 | 3.22 | 7.52 | 7.36 |
| ξ2/% | 3 | 3.16 | 3.21 | 5.44 | 6.85 |
), ArticleFig(id=1245390270766892008, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=EN, label=Table 3, caption=
Identification results of the frame parameters of the structural model
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| 刚度系数 | 真实值/(kN/m) | 识别值/(kN/m) | 误差/% |
|---|
| k1 | 265.60 | 278.12 | 4.71 |
| k2 | 257.60 | 246.42 | -4.34 |
| k3 | 261.90 | 259.70 | -0.84 |
| k4 | 263.90 | 256.80 | -2.69 |
| k5 | 271.30 | 259.82 | -4.23 |
), ArticleFig(id=1245390270863361004, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245390258892816565, language=CN, label=表3, caption=
试验框架参数识别结果
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| 刚度系数 | 真实值/(kN/m) | 识别值/(kN/m) | 误差/% |
|---|
| k1 | 265.60 | 278.12 | 4.71 |
| k2 | 257.60 | 246.42 | -4.34 |
| k3 | 261.90 | 259.70 | -0.84 |
| k4 | 263.90 | 256.80 | -2.69 |
| k5 | 271.30 | 259.82 | -4.23 |
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