Article(id=1228295923411907219, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228295917908980268, articleNumber=null, orderNo=null, doi=10.16385/j.cnki.issn.1004-4523.2025.03.011, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1688400000000, receivedDateStr=2023-07-04, revisedDate=1695052800000, revisedDateStr=2023-09-19, acceptedDate=null, acceptedDateStr=null, onlineDate=1770778168776, onlineDateStr=2026-02-11, pubDate=1741536000000, pubDateStr=2025-03-10, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1770778168776, onlineIssueDateStr=2026-02-11, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1770778168776, creator=13701087609, updateTime=1770778168776, updator=13701087609, issue=Issue{id=1228295917908980268, tenantId=1146029695717560320, journalId=1225147924628267009, year='2025', volume='38', issue='3', pageStart='449', pageEnd='662', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1770778167464, creator=13701087609, updateTime=1770949125482, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1229012967862235389, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228295917908980268, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1229012967862235390, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228295917908980268, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=550, endPage=557, ext={EN=ArticleExt(id=1228295923718091421, articleId=1228295923411907219, tenantId=1146029695717560320, journalId=1225147924628267009, language=EN, title=Analytical research on dynamic amplification factor of multi-degree-of-freedom system, columnId=null, journalTitle=Journal of Vibration Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=
In the dynamic impact response analysis of the structure,the dynamic amplification factor(DAF)is usually used to simplify the calculation of the dynamic response of the structure. However,the size of DAF in engineering structures is still controversial. In order to solve this problem,the analytical expression of DAF of multi-degree-of-freedom system(MDOF)is derived in this paper,and the precondition of DAF greater than 2.0 is analyzed. The accuracy of the analytical expression is verified by the single-degree-of-freedom(SDOF)and MDOF example models,and the reason why the DAF of the MDOF is greater than 2.0 is explained. Finally,based on the DAF analytical method proposed in this paper,the DAF distribution law of beam string under cable breaking impact is analyzed. The analysis results show that when the contribution of a first-order modal shape is opposite to the static response,the DAF of the beam string may be greater than 2.0. Even for the damping system,the DAF of the beam string may be greater than 2.0.
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在结构动力冲击响应分析中,通常采用动力放大系数(DAF)简化计算结构的动力响应。但是,目前工程结构中对DAF的取值还存在争议。针对此问题,本文推导了多自由度(MDOF)体系的DAF解析表达式,分析了DAF大于2.0的前提条件;分别通过单自由度(SDOF)体系和MDOF体系算例模型验证了解析表达式的准确性,解释了MDOF体系的DAF大于2.0的原因。基于所提出的DAF解析表达式分析了张弦梁剩余结构在断索冲击作用下的DAF分布规律。分析结果表明:当某一阶模态振型的分量与静力响应值反向时,张弦梁的DAF可能会大于2.0;即使在有阻尼情况下,张弦梁的DAF也可能会大于2.0。
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Schematic diagram of simple supported beam models, figureFileSmall=1KSYD+oCk2WN449OQkSotw==, figureFileBig=lwUUogU6G8lZ0mRhbHxVuA==, tableContent=null), ArticleFig(id=1228312953762541844, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图1, caption=
简支梁模型示意图, figureFileSmall=1KSYD+oCk2WN449OQkSotw==, figureFileBig=lwUUogU6G8lZ0mRhbHxVuA==, tableContent=null), ArticleFig(id=1228312953892565280, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Fig.2, caption=
Vibration mode of model 1(f=8. 57 Hz), figureFileSmall=qtaRXN7HBlcAZhEfwcc0lw==, figureFileBig=/040vUBvUN8oLH6K4Ka0gQ==, tableContent=null), ArticleFig(id=1228312953976451364, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图2, caption=
模型1模态振型(f=8.57 Hz), figureFileSmall=qtaRXN7HBlcAZhEfwcc0lw==, figureFileBig=/040vUBvUN8oLH6K4Ka0gQ==, tableContent=null), ArticleFig(id=1228312954072920364, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Fig.3, caption=
The first 3 orders vibration modes of model 2, figureFileSmall=H7KglBJIRwh4hsrgisD2Jw==, figureFileBig=F4SJ/pcgYpNL7/JKV5IRTg==, tableContent=null), ArticleFig(id=1228312954169389363, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图3, caption=
模型2的前3阶模态振型, figureFileSmall=H7KglBJIRwh4hsrgisD2Jw==, figureFileBig=F4SJ/pcgYpNL7/JKV5IRTg==, tableContent=null), ArticleFig(id=1228312954282635578, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Fig.4, caption=
Schematic diagram of string beam, figureFileSmall=aDIfkGOxKRPHjFP2NPSW5Q==, figureFileBig=cE+p9kAfHWOCJvW5HBTy3g==, tableContent=null), ArticleFig(id=1228312954391687489, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图4, caption=
张弦梁算例示意图, figureFileSmall=aDIfkGOxKRPHjFP2NPSW5Q==, figureFileBig=cE+p9kAfHWOCJvW5HBTy3g==, tableContent=null), ArticleFig(id=1228312955817750863, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Fig.5, caption=
Calculation diagram of residual structure of string beam model, figureFileSmall=xMhMmBXcSdIYQX7/L+K3+g==, figureFileBig=0yTcItO0J6ELnajcXuNcVg==, tableContent=null), ArticleFig(id=1228312955922608471, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图5, caption=
张弦梁剩余结构模型计算简图, figureFileSmall=xMhMmBXcSdIYQX7/L+K3+g==, figureFileBig=0yTcItO0J6ELnajcXuNcVg==, tableContent=null), ArticleFig(id=1228312956052631907, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Fig.6, caption=
Cumulative modal mass participation coefficient of residual structure of string beam model, figureFileSmall=XWmTiXFRV+yipIJ+susqwg==, figureFileBig=GyXtCOwlSh4R1Oz3o6r96A==, tableContent=null), ArticleFig(id=1228312956157489514, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图6, caption=
张弦梁剩余结构模型累积模态质量参与系数, figureFileSmall=XWmTiXFRV+yipIJ+susqwg==, figureFileBig=GyXtCOwlSh4R1Oz3o6r96A==, tableContent=null), ArticleFig(id=1228312956321067382, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Fig.7, caption=
The first 5 orders vibration modes of residual structure of string beam model, figureFileSmall=4iib0JLUbFGonpdhPDURSw==, figureFileBig=IUbPOZ67pTVzBK/EEVrkVw==, tableContent=null), ArticleFig(id=1228312956430119289, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图7, caption=
张弦梁剩余结构模型前5阶模态振型, figureFileSmall=4iib0JLUbFGonpdhPDURSw==, figureFileBig=IUbPOZ67pTVzBK/EEVrkVw==, tableContent=null), ArticleFig(id=1228312956518199680, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Fig.8, caption=
Comparison of DAF results calculated by AM method and NM method, figureFileSmall=UlvxG7//nEIV9ziC6XfERg==, figureFileBig=42BTF9QfNLRyQuyD1vVaZA==, tableContent=null), ArticleFig(id=1228312956648223109, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=图8, caption=
AM法与NM法计算的DAF结果对比, figureFileSmall=UlvxG7//nEIV9ziC6XfERg==, figureFileBig=42BTF9QfNLRyQuyD1vVaZA==, tableContent=null), ArticleFig(id=1228312956769857933, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Tab.1, caption=
Calculation results comparison of model 1
, figureFileSmall=null, figureFileBig=null, tableContent=
| 求解方法 | ust/mm | ud/mm | DAF |
|---|
| AM | -4.60 | 9.20 | 2.0 |
| NM | -4.60 | 9.20 | 2.0 |
), ArticleFig(id=1228312956916658581, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=表1, caption=
模型1计算结果比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| 求解方法 | ust/mm | ud/mm | DAF |
|---|
| AM | -4.60 | 9.20 | 2.0 |
| NM | -4.60 | 9.20 | 2.0 |
), ArticleFig(id=1228312957034099100, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Tab.2, caption=
Calculation results comparison of different nodes in model 2
, figureFileSmall=null, figureFileBig=null, tableContent=
| 节点编号 | 求解方法 | ust/mm | un,d/mm | ∑un,d/mm | DAF |
|---|
| u1,d | u2,d | u3,d |
|---|
| D2 | AM | -2.30 | -4.86 | 0.00 | 0.06 | -4.80 | 2.1 |
| NM | -2.30 | — | — | — | -4.80 | 2.1 |
| D3 | AM | -4.60 | -8.89 | 0.00 | -0.31 | -9.20 | 2.0 |
| NM | -4.60 | — | — | — | -9.20 | 2.0 |
| D4 | AM | -2.30 | -4.86 | 0.00 | 0.06 | -4.80 | 2.1 |
| NM | -2.30 | — | — | — | -4.80 | 2.1 |
), ArticleFig(id=1228312957172511142, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=表2, caption=
模型2中不同节点的计算结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 节点编号 | 求解方法 | ust/mm | un,d/mm | ∑un,d/mm | DAF |
|---|
| u1,d | u2,d | u3,d |
|---|
| D2 | AM | -2.30 | -4.86 | 0.00 | 0.06 | -4.80 | 2.1 |
| NM | -2.30 | — | — | — | -4.80 | 2.1 |
| D3 | AM | -4.60 | -8.89 | 0.00 | -0.31 | -9.20 | 2.0 |
| NM | -4.60 | — | — | — | -9.20 | 2.0 |
| D4 | AM | -2.30 | -4.86 | 0.00 | 0.06 | -4.80 | 2.1 |
| NM | -2.30 | — | — | — | -4.80 | 2.1 |
), ArticleFig(id=1228312957273174446, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Tab.3, caption=
Calculation results comparison of different nodes in model 3
, figureFileSmall=null, figureFileBig=null, tableContent=
| 节点编号 | 求解方法 | ust/mm | un,d/mm | ∑un,d/mm | DAF |
|---|
| u1,d | u2,d | u3,d |
|---|
| D2 | AM | -2.00 | -2.66 | -1.01 | -0.32 | -4.00 | 2.0 |
| NM | -2.00 | ─ | ─ | ─ | -4.00 | 2.0 |
| D3 | AM | -2.30 | -4.84 | 0.00 | 0.04 | -4.80 | 2.1 |
| NM | -2.30 | ─ | ─ | ─ | -4.80 | 2.1 |
| D4 | AM | -1.00 | -2.66 | 0.03 | -0.27 | -2.90 | 2.6 |
| NM | ─ | ─ | ─ | ─ | ─ | ─ |
), ArticleFig(id=1228312957474501046, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=表3, caption=
模型3中不同节点的计算结果对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 节点编号 | 求解方法 | ust/mm | un,d/mm | ∑un,d/mm | DAF |
|---|
| u1,d | u2,d | u3,d |
|---|
| D2 | AM | -2.00 | -2.66 | -1.01 | -0.32 | -4.00 | 2.0 |
| NM | -2.00 | ─ | ─ | ─ | -4.00 | 2.0 |
| D3 | AM | -2.30 | -4.84 | 0.00 | 0.04 | -4.80 | 2.1 |
| NM | -2.30 | ─ | ─ | ─ | -4.80 | 2.1 |
| D4 | AM | -1.00 | -2.66 | 0.03 | -0.27 | -2.90 | 2.6 |
| NM | ─ | ─ | ─ | ─ | ─ | ─ |
), ArticleFig(id=1228312957575164345, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=EN, label=Tab.4, caption=
Dynamic analysis results of residual structure of string beam model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 节点编号 | 位移/mm | 1st Mode | 2nd Mode | 3rd Mode | 4th Mode | 5th Mode | ∑un/mm | DAF |
|---|
| D4 | un,st | -13.69 | -4.12 | -0.36 | 0.31 | 0.09 | -17.77 | — |
| un,d | -27.36 | -7.98 | -0.66 | 0.17 | 0.08 | -35.75 | 2.1 |
| un,d(ζ) | -25.92 | -5.51 | -0.37 | 0.31 | 0.09 | -31.40 | 1.8 |
| D7. | un,st | -32.03 | -3.50 | -0.01 | -0.16 | -0.03 | -35.72 | — |
| un,d | -64.02 | -6.05 | -0.39 | -0.37 | -0.06 | -70.89 | 2.0 |
| un,d(ζ) | -60.64 | -4.38 | -0.02 | -0.32 | -0.03 | -65.39 | 1.8 |
| D10 | un,st | -32.02 | 3.50 | 0.15 | 0.32 | -0.03 | -28.08 | — |
| un,d | -64.02 | 0.31 | 0.02 | 0.10 | -0.02 | -63.61 | 2.3 |
| un,d(ζ) | -60.64 | 4.15 | 0.16 | 0.32 | -0.03 | -56.04 | 2.0 |
| D13 | un,st | -13.69 | 4.12 | -0.36 | -0.31 | 0.09 | -10.15 | — |
| un,d | -27.36 | 0.23 | -0.27 | -0.51 | 0.05 | -27.86 | 2.8 |
| un,d(ζ) | -25.92 | 4.13 | -0.36 | -0.31 | 0.09 | -22.37 | 2.2 |
), ArticleFig(id=1228312957705187779, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228295923411907219, language=CN, label=表4, caption=
张弦梁剩余结构模型的动力分析结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 节点编号 | 位移/mm | 1st Mode | 2nd Mode | 3rd Mode | 4th Mode | 5th Mode | ∑un/mm | DAF |
|---|
| D4 | un,st | -13.69 | -4.12 | -0.36 | 0.31 | 0.09 | -17.77 | — |
| un,d | -27.36 | -7.98 | -0.66 | 0.17 | 0.08 | -35.75 | 2.1 |
| un,d(ζ) | -25.92 | -5.51 | -0.37 | 0.31 | 0.09 | -31.40 | 1.8 |
| D7. | un,st | -32.03 | -3.50 | -0.01 | -0.16 | -0.03 | -35.72 | — |
| un,d | -64.02 | -6.05 | -0.39 | -0.37 | -0.06 | -70.89 | 2.0 |
| un,d(ζ) | -60.64 | -4.38 | -0.02 | -0.32 | -0.03 | -65.39 | 1.8 |
| D10 | un,st | -32.02 | 3.50 | 0.15 | 0.32 | -0.03 | -28.08 | — |
| un,d | -64.02 | 0.31 | 0.02 | 0.10 | -0.02 | -63.61 | 2.3 |
| un,d(ζ) | -60.64 | 4.15 | 0.16 | 0.32 | -0.03 | -56.04 | 2.0 |
| D13 | un,st | -13.69 | 4.12 | -0.36 | -0.31 | 0.09 | -10.15 | — |
| un,d | -27.36 | 0.23 | -0.27 | -0.51 | 0.05 | -27.86 | 2.8 |
| un,d(ζ) | -25.92 | 4.13 | -0.36 | -0.31 | 0.09 | -22.37 | 2.2 |
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