![](https://csdnimg.cn/release/download_crawler_static/19008926/bg1.jpg)
第
33
卷第
9
期
振动与冲击
JOURNAL
OF
VIBRATION
AND
SHOCK
地下拱形结构爆炸晌应计算二维和三维模型比较
洪武
1
,
2
徐迎金丰年范华林
2
,
3
Vo
l.
33
No.9
2014
(1.解放军理工大学国防工程学院,南京
210007
;2.
重庆交通大学(桥梁)结构工程重点试验室,重庆
400074;
3.
河海大学力学与材料学院/岩土力学与堤坝工程教育部重点试验室,南京
210098
)
摘
要:数值计算是研究地下拱形结构在爆炸荷载作用
F
动力响应问题的一种较好方法,数值计算过程中将三维
(3D)
模型简化为二维
(20)
模型能提高数值计算效率,同时也会造成一定的计算误差。为了研究二维计算模型能否等效
三维计算模型以及等效的前提条件和范围,采用数值计算分别对
30
模型和
20
模型爆炸冲击作用下地下拱形结构动力
响应进行比较分析。计算结果表明:在两种计算模型中,自由场压力峰值的计算结果在装药周围差异较大,随着装药距离
的增加趋于吻合;在
20
模型中拱形结构的约束条件被增强,导致
20
模型计算得到的应力、应变和质点振动速度偏小;当
比例爆距大于一定值时
20
模型和
30
模型的计算结果吻合较好,计算表明该临界值为临界比例距离为
2.76
m/
kg
1
/
3
o
关键词:地下拱形结构;爆炸;二维数值模拟方法;三维数值模拟方法
中图分类号
:
T
U3
91
文献标志码
A
OOI:
10.
13465/j. cnki. jvs.
2014.
09.
026
Comparison
between
2D
and
3 D
models
for
computing
blast
responses
of
buried
arching
structures
HONG
Wu
1
,2 , XU Ying
1
,
]l
N
Feng-ni
α
n
1
,
FAN
Hu
α
_lin
2
,
3
(1.
Engineering
Institute
of
Corps
Engineers ,
College
of
Science ,
PLA
University
of
Science
and
Technology
,
Nanjing
210007
, China;
2.
Key
La
boratory
of
Bridge-structure
Engineering
,
Chongqing
Jiaotong
University
,
Chongqing
400074 , China;
3.
College
of
Mechanics
and
Mate
r:i
als
&
Key
Laboratory
of
Ministry
of
Education
for
Geomechanics
and
Embankment
Engineering
,
Hohai
University
,
Nanjing
210098
, China)
Abstract:
The buried arching structures' responses to explosion are always a hot tonic
in
protective engineering.
In
current practice , computing underground structures' responses to explosion mainly
depends
on empirical formulae
by
simplifying structure members' interaction
but
pertinent experimental
data
are
extremely scarce. Finite element method
is
an available way to do it. However, a
3D
modl
needs
an
efficient computer
and
consumes much time , a
2D
model
is
considered to replace the
3D
mode
l.
It
is important to compare performances of
2D
and
3D
models in order
to
find
conditions for neglecting the differences between the computing results of
2D
and
3D
models.
Here
, the responses
of
underground arching structures
subjected
to explosion were simulated with
2D
and
3D
models using LSDYNA soft ware ,
respectively.
The
computation results with
2D
and
3D
models were compared.
It
was shown that the computing results with
2D
and
3D
models agree well
just
under
the condition that the distance between the response point computed and
the
charge explosive position is beyond a certain
value;
the computing results of structural vibrations with
2D
and
3 D models
agree better.
Key
words:
underground
structure;
arching
structure;
blast wave propagation; numerical simulation
爆炸荷载作用下地下防护结构计算通常采用美国
TM5
_855[1]
建议的三系数法,将结构和介质分别考
基金项目:国家自然科学基金创新研究群体科学基金
(51021001
,
51321064)
;国家自然科学基金
(51078351)
;重庆交通大学(桥梁)结
构工程重点实验室开放基金(
CQSLBF
-
ZII
- 1 )
;岩土力学与堤坝
工程教育部实验室(河海大学)开放基金(
GH200905)
资助项目
收稿日期
2012-05-21
修改稿收到日期
:2013
-02 -26
2
在-作者洪武男,博士生,
1980
年生
通信作者范华林男,博士,教授,
1974
年生
虑,忽略介质和结构的相互作用,在试验数据的基础上
修正自由场的应力,从而使其可以适用于地下结构的
荷载计算和结构响应,但是适应区域范围受到较大局
限,例如当爆炸源与结构相距较远时计算结果有明显
的偏差;另一种计算方法利用相互作用理论分析地下
结构荷载,在此基础上可采用单自由度等效计算理论、
数值计算和解析方法等
[2
叫
O
相比于以上近似分析方
法,数值计算方法能够更加准确的定性分析复杂地下