第
31
卷第
21
期
振动与冲击
JOURNAL
OF
VIBRATION
AND
SHOCK
Vo
l.
31
No.21
2012
基于解析模态分解法的桥梁动态应变监测数据温度影晌的分离
李苗
1
气任伟新胡异丁
1
，
3
王宁波
I
(1.中南大学土木建筑学院，长沙
410075;
2.
湖南城市学院土木工程学院，湖南益阳
4130
∞;
3.
五邑大学信息工程学院，广东江门
529020)
摘
要:对于大跨度桥梁结构，温度荷载会对结构应变产生显著影响。为得到桥梁在动荷载下的真实应变，对其
运营状况做出正确评估，有必要将温度变化对应变的影响从结构应变中剔除。对比分析了悬索桥钢街架跨中上弦杆的温
度应变片和工作应变片数据的功率谱密度，得到应变片输出信号在各频段的能量分布特征，确定了工作应变片数据中温
度应变信息和动荷载应变信息的分界频率;采用解析模态分解法，根据分界频率将工作片原始应变时程分离为慢变成分
和快变成分两部分。结果表明，由温度变化产生的应变时程波动(慢变成分)得到有效分离，该方法不仅能去除温度变化
引起的应变片自身的应变，同时温度应力引起的应变亦得到有效剔除;通过雨流计数法对提取出的快变成分进行检验分
析。结果表明，快变成分较好地保留了桥梁动荷载产生的应变信息，具有较高的工程利用价值。
关键词:悬索桥;健康监测:解析模态分解法;温度变化;应变;信号分离
中图分类号
U441
文献标识码
:A
Separating
temperature
effect
from
dynamic
strain
measurements
of
a
bridge
based
on
analytical
mode
decomposition
method
LI
Mmo1
,2 , REN
Wei-zirt
, HU
Yi-ding1
，
3
，即
'A
NG
Ning-bo
1
(1.
School
of
Ci
vil
Engineering
and
Architecture
,
Central
South
University
,
Changsha
410075
, China;
2.
College
of
Ci
vil
Engineeri
吨，
Hunan
City
University
,
Hunan
Yiyang
413000
,
China;
3.
School
of
Information
Engineeri
吨，
Wu
Yi
University
,
Guangdong
)iangmen
529020
,
China)
Abstract:
Under temperature load , structural stress of a long-span bridge changes and its strain is affected
remarkably. For proper assessment of bridge operation condition , i
t'
s highly necessary
to
remove the effect of
va
巧
rmg
temperature on the strain data and get the structure strain induced by dynamic load on the bridge. Here , dynamic strains
of the active strain gauges fixed on chord of steel truss at mid span of a suspension bridge and
inactiv~
strain gauges not
sensing mechanical surface strains but temperature variation induced strains were analyzed. According to normalized power
spectral density
(PSD) ratio , the information in strain data of the active gauges were separated into
two
parts in frequency
domain
，也
ey
were respectively dominated by varying temperature and dynamic load and the value of dividing frequency
was obtained.
Mter
the a nalytial mode decomposition method was applied to the strain data, the slow-varying component
and fast-varying component were obtained.
1t
was shown that the fast-varying component does not fluctuate periodically;
the
slow-valγing
component including strain of gauges themselves and structural strain induced by temperature variation
can
be
effectively eliminated from the strain data of the active strain gauges.
Th
rough test analysis with the rain-flow
counting method
, it was indicated that the strain amplitude information of the fast-varying component and that of the
original data from active gauges are sim
i1
ar;
the fast-varying component properly retains the strain information produced by
dynamic load and has some practical engineering value.
Key
wor
d.s:
suspension bridge; health monitoring; analytical mode decomposition method; temperature variation;
strain; signal separation
正常运营中的桥梁结构，特别是悬索桥、斜拉桥等
多次超静定结构系统，温度对结构的边界条件和连续
基金项目:国家自然科学基金
(51078357
)
收稿日期，
2012
-04-10
修改稿收到日期，
2012
-05 -28
第-作者李苗男，博士生，
1980
年
8
月生
条件有显著影响
[1
-5]
环境因素(如温度)的改变导致
结构动力学参数和结构响应的变化不容忽视。国内外
学者进行了大量的有关环境因素对结构固有频率影响
的试验研究，但往往无法区分是环境因素变异造成结
构固有频率的变化，还是因结构真实损伤造成的固有
频率改变
[6
-7]
。文献
[8J
分析了温度改变对结构响应
资源评论
weixin_38610052
- 粉丝: 6
- 资源: 942
最新资源
- springboot279基于javaweb的影院订票系统的设计与实现.zip
- springboot279基于javaweb的影院订票系统的设计与实现_0303174040.zip
- springboot280基于WEB的旅游推荐系统设计与实现.zip
- springboot280基于WEB的旅游推荐系统设计与实现_0303174040.zip
- 基于C语言罗斯方块游戏实现示例与解析
- springboot281旅游网站.zip
- springboot281旅游网站_0303174040.zip
- springboot282基于web的机动车号牌管理系统_0303173844.zip
- springboot282基于web的机动车号牌管理系统.zip
- springboot282基于web的机动车号牌管理系统_0303174040.zip
- springboot059课程答疑系统.zip
- springboot283图书商城管理系统.zip
- springboot059课程答疑系统_0303152757.zip
- springboot256基于springboot+vue的游戏交易系统_0303174040.zip
- springboot256基于springboot+vue的游戏交易系统.zip
- springboot061基于B2B平台的医疗病历交互系统.zip
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
