
河北科技大学学报
第
29
卷第
2
期
2008
年
6
月
Journal of Hebei University of Science and Technology
文章编号
:1008-1542(2008)02-0124-04
Vo
l.
29.No.
2
June 2008
基于精细积分的桥梁移动荷载识别精度分析
黄立新
1
,
2
,邓子辰
1
,
3
,侯秀慧
1
(1.西北工业大学力学与土木建筑学院,陕西西安
710072;2.
华北水利水电学院基建处,河南郑州
450011;3.
大连理工大学工业装备结构分析国家重点实验室,辽宁大‘连
116024)
摘
要:为了识别作用于桥梁结构的移动荷载并对识别的敏感性进行分析,比较各参数对识别结果
的影响,首先有效地将桥梁结构振动微分方程转化为精细积分方法的一般形式,进而得出荷载识别
精细积分方法的
HP
D-
S
格式;基于
Matlab
仿真技术,重点讨论测量噪声、模态数、车速及来样频率
等几个主妥参数对识别结果的影响。仿真算例表明,该识别方法对模态数不敏感,但对采样频率敏
感性较高,车速与测量噪声是影响荷载识别精度的主要因素。通过选择适当的参数,该方法可以有
效地识别桥梁结构的移动荷载,从而为工程应用提供技术指导。
关键词:桥梁结构;精细积分;移动荷载;精度分析;荷载识别
中固分类号
:TU311
文献标识码
:A
Precision analysis for dynamic moving load identification of bridge
structure
based on precise integration method
HUANG
Li-xin
1
•
2
,
DENG
Zi-chen
1
•
3
,
HOU
Xiu-hui
1
(l.
School of Mechanics. Civil Engineering and
Architecture.
Northwestern
Polythechnical
University.
X
i:
an
Shaanxi 710072.
China;
2.
Department of Capital
Co
nstruction.
North
China University of
Water
Conservancy and Electric
Power.
Zhengzhou
Henan
450011.China;3.
State
Key Laboratory of
Structural
Analysis for lndustrial Equipment. Dalian University of Technolo-
gy.
Dalian Liaoning 116024.China)
Abstract:
The
vibration differential equation of bridge
structure
is converted into
the
general format
of
PIM
(precise integra-
tion method) in
order
to identify the moving load of bridge
structure
and to analyse
the
effect of various parameters
on
the
iden-
tification.
The
HP
D-S format
of
PIM
for moving load identification is
then
obtained. by using
Matlab
numerical technique.
the
effects of some primary
parameters.such
as measurement noise. mode
number.
vehicle speed and sampling frequency.are dis-
cussed. N umerical results show
that
the
method is not sensitive
to
the
number of
modes.
whereas it is sensitive to sampling fre-
quency. And
the
measurement noise and vehicle speed are identified as
the
two main obstacles leading to erroneous results.
With
a good choice of these
parameters.
it can identify moving load effectively. which is a good guide for engineering application.
Key
words:
bridge
structure;
precise integration; moving load; precision analysis; load identification
桥梁结构移动荷载识别是结构动态荷载识别的一个方向,属于结构动力学的第
2
类逆问题。已有不少
人在这方面做了深入的研究
[1-
飞特别是近几十年来,随着高速铁路的出现和大跨度桥梁的发展,桥梁结构
移动荷载识别问题在桥梁健康检测等方面发挥着越来越重要的作用。笔者将钟万艇、提出的精细积分方法
[4J
收稿日期
:2007-10-08;
责任编弱
g
冯
民
基金项目
g
国家自然科学基金资助项目(1
0572119)
作者简介
z
黄立新(1
966
寸,男,河南郑州人,博士研究生,主要从事结构荷载识别及结构健康监测方面的研究。