2012
年
9
月
第
28
卷第
5
期
沈阳建筑大学学报(自然科学版)
Journal
of
Shenyang
Jianzhu
University
(Natural
Science)
文章编号
:2095
-1922(2012)05 -0782
-06
Sep.
2012
Vo
l.
28
, No.5
混凝土双轴拉压动态强度及破坏准则试验
尚世明，宋玉普
(大连理工大学海岸及近海工程国家重点实验室，辽宁大连
116024)
摘
要:目的研究不同应变率和不同侧拉应力对普通混凝土强度的影响，建立普通混凝土的
动态拉压强度准则.方法利用大连理工大学自行研制的大型静、动三轴伺服试验系统，对带有
螺栓的哑铃形变截面试件和立方体试件，进行了不同侧拉应力和不同应变率下混凝土动态强
度试验.结果混凝土动态双轴拉压强度随拉应力的增加而逐渐减小，随着应变率的增加而增
加.当应变率为
10-
2
S-I
时，羊轴抗拉强度增加幅度最小，为
8.9%
;当侧拉应力为1.
4
MPa
时
增加最大，为
32.8%.
结论通过数据拟合得到了混凝土动态拉压破坏准则，为分析混凝土在动
态拉压应力状态下混凝土结构的数值分析提供了依据.
关键词:混凝土;拉压;动态强度;应变率;动态破坏准则
中图分类号
:TU502.6
文献标志码
:A
Experimental Study of Concrete Dynamic Strength and Failure
Criterion under Biaxial Tensile-Compressive Load
SHANGShiming ,SONG Yupu
(State
Key
Lab.
of
Coast
and
Offshore
Eng.
D
a1i
an
University
of
Technology
,D
a1i
an
,
China
,
116024)
Abstract:
The
influenc
四
of
different strain rates and different later
a1
tensile stresses to ordinary concrete
were studied; the dynarnic tensile-compressive failure criteriön was established. By the large static and dy-
n
缸咀
c
triaxi
a1
servo test system developed by Dalian University
of
Technology , under the differenttensile
由
esses(O
MPa,
O.
7 MPa,1. 4 MPa ,
2.
1 MPa and
2.8
MPa) ,anddifferent strain rates(
10
-5
S
-1
,10
-4
s
-1
,
10
-3
S
-1
,and
10
-2
S -1) ,dynarnic biaxi
a1
tensile-~ompressive
s
住
'ength
of
concrete was tested. The concrete
dynarnic strength
is
decreased with the increase
of
later
a1
tensile stress and increased with the increase of
strain rate.
When the strain rate is 10
-2
S
-1
, the increased
sc
a1
e
of
uniaxi
a1
tensile strength
扭曲
e
smallest
( 8. 9 % ) ; when later
a1
tensile stress is
1.
4 MPa, the increased
sc
a1
e
of
strength
is
由
e
biggest(32.
8%).
By
fitting
也
e
experimen
ta1
data, concrete dynarnic tensile-compressive failure criterion was established. The es-
tablished failure criterion could providethe basis for an
a1
yzing concrete failure under
dyn
组回
c
tensile-com-
pressive load.
Key
words: concrete ; tensile-compressive ; dynarnic strength; strain rate; dynarnic failure criterion
混凝土的抗拉强度只有其抗压强度的
118-
1110[1]
设计中普遍把混凝土的单轴抗拉强度作
为计算混凝土大坝抗裂安全系数的指标
[2]
实际
应用中，混凝土常处于复杂的拉压应力状态
[3]
收稿日期
:2012
-06 -02
基金项目:国家自然科学基金项目
(90815026)
已有的静态试验表明，混凝土在拉压应力组合状
态下，其抗压强度和抗拉强度分别比单轴抗压强
度和单轴抗拉强度降低
[4-6]
所以把混凝土单轴
抗拉强度作为设计依据是不安全的.
Abrams[7]
经
作者简介:尚世明
(1980
一)
，男，博士研究生，主要从事土木工程方向研究.
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