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书 书 书

53

 

2018

       

西

 

 

 

 

 

 

 

JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY

        Vol. 53  No. 1 Feb. 2018

稿

20160929

:国

目(

51578056

);中

2015G001L

2015G001B1

);

2016JBM037

:钟

1988

),男

,博

,研

Email

14115338@ bjtu. edu. cn

:高

1968

),男

,教

,博

,研

Email

lgao@ bjtu. edu. cn

:钟

,高

,侯

西

2018

53

):

3845

63. ZHONG Yanglong

GAO Liang

HOU Bowen. Shear behavior of mortar layer in continuous slab track with different arrangement schemes of embedded steel bars

. Journal of Southwest Jiaotong University

2018

53

):

3845

63.    

02582724

2018

01003809    DOI

10. 3969 / j. issn. 02582724. 2018. 01. 005

不同植筋方案纵连板轨道

砂浆层抗剪性能分析

 

 

 

1.

,北

100044

2.

,北

100044

 

:为

,采

,考

线

,建

,并

,细

:植

;层

10. 5 ℃

30 ℃

;温

20 ℃

,采

16 + 8 + 8

,温

20 ~ 30 ℃

,采

16 + 16 + 16 + 10 + 8

,超

30 ℃

,需

:铁

;植

;抗

;温

;基

U211. 3   

Shear Behavior of Mortar Layer in Continuous Slab Track with

Different Arrangement Schemes of Embedded Steel Bars

ZHONG Yanglong

  GAO Liang

  HOU Bowen

1. School of Civil Engineering

Beijing Jiaotong University

Beijing 100044

China

2. Beijing Key Laboratory of Track Engineering

Beijing 100044

China

Abstract

In order to study the reasonable arrangement scheme of embedded steel bars under different

temperatures

a threedimensional finite element model of continuous slab track was established. In the

model

a surface based cohesive zone model

SCZM

was introduced and utilized to simulate the

complex interaction between track slab and mortar layer in the process of shear failure

which was

bondingdebondingcontact.

Nonlinear constraint characteristic of shearing steel bars were also

considered. Based on the model validated by the results of longitudinal shear test of slab track

shear

behaviors of CA mortar layer were analyzed particularly. The results show that embedded steel bars can

significantly improve interlayer shear performance of slab track. The increasing extent of temperature

when interlayer is cracking increases from 10. 5 ℃ to 30 ℃ . It is suggested that the 16 + 8 + 8

arrangement scheme of embedded steel bars could be used when the temperature rise less than 20 ℃

and 16 + 16 + 16 + 10 + 8 is also proposed when the temperature rise at 20 ~ 30 ℃

Over 30 ℃

other

measures should be used.

(2)

,等

:不

Key words

railroad track

embedded steel bar

shear strength

temperature

surface based cohesive

zone model

SCZM

   

,由

、稳

、维

12

广

CRTS Ⅱ

型纵

,已

、沪

、京

、沪

线

,运

5 000 km

CRTSⅡ

使

,但

(如

高温

),个别薄弱区段出现了轨道板上拱离

、宽

,在较大温度力作用下可能

,并

,对

,在

,国

:苗

,采

,该

便

,但

;针

,任

,并

CA

,且

线

,计

,并

;谭

CA

,建立无砟轨道空间耦合实体模

,分析了植筋锚固对轨道板离缝上拱的整治

、孙

、刘

、戴

811

,结

,在

脱黏

接触的剪切

,轨

,层

,将

方案研究时虽然考虑了

CA

线

,但

CA

本文采用基于表面的内聚力模型

12

SCZM

surface based cohesive zone model

)模

,对

,并

,为

1 

1. 1 

   

δ

)非

线

(图

),并

,基

,采

,巧

接触过程的模拟

目前

,基于

广

13

、编

14

、耐

、水

δ

δ

1 

Fig. 1  Tractionseparation behavior of SCZM

(如

)可

)初

,牵

线

,表

线

,此

,无

)当

ult

,伤

,伤

损萌生判定条件为二次名义应力准则

15

quadratic nominal stress criterion

(

?

?

)

(

)

(

)

= 1

、第

、第

分别为法向

、第一切向

、第二切向

(3)

西

 

 

 

 

 

 

 

53

??表

)伤

,界

,伤

,称

14

D =

δ

δ

max

- δ

δ

max

δ

- δ

),

δ

max

0 ~ 1

:当

D = 0

,表

;当

D = 1

,表

,层

,牵

13

1 - D

δ

  δ

> 0

δ

  δ

≤0

{

3a

1 - D

δ

3b

1 - D

δ

3c

分别为法向

、第一切向

、第二切向各

δ

δ

δ

、第

切向

、第二切向

,因

线

,层

13

(

)

(

)

(

)

= 1

)时

,界

,层

,接

:法

,本

“硬

”模

16

;切

1. 2 

   

,不

,为

,由

,因

,忽

,模

17

,模

CA

,层

18

,砂

,本

,砂

,通

65 m.

,而

CA

,以

,另

,完

,同

、砂

19

同时借鉴文献[

18

]的网格大

,通

0. 10

0. 05 m

0. 02 m 3

计算结果后

,确定本文模型网格单元尺寸为

0. 1 m.

块板上的剪力筋布置形式主要有

10

16

,则

16

,剪

线

60 kN

,错

0. 6 mm

,可

2 

Fig. 2  Forcedisplacement constitutive of shearing steel bar

线

,通

线

,赋

线

2.

,采

ABAQUS

立的无砟轨道

(4)

,等

:不

1. 3 

   

CA

状态

,国内外开展了一系列实尺模型的推板试

911

,其

被广泛应用于

型板式轨道的设计与研究

10

17

行对比以

1. 2

,改

,且

,其

线

1 

Tab. 1  Track parameters

目 弹

/ GPa

比 密

kg

·

m- 3

) 热

× 10- 5 ℃- 1

) 宽

/ m

/ m

36. 0 0. 2 2 400 1. 0 2. 55 0. 20

25. 5 0. 2 2 400 1. 5 2. 95 0. 20 CA

8. 0 0. 2 2 400 1. 5 2. 55 0. 03

2 

CA

Tab. 2  Interface parameters of track slabCA mortar layer

目法

·

m- 3

)切

·

m- 3

) 抗

/ Pa

/ Pa

·

m- 2

) 摩

2 × 1012 5 × 107 5. 4 × 105 2. 5 × 104 10 ~ 35 0. 35

3 

Fig. 3  Finite element model of slab track

4 

Fig. 4  Comparison of longitudinal shear test results

,两

,计

412 kN

),与

410 kN

10

,本

,表

2 

层间剪切破坏过程分析及植筋方

   

,并

,分

2. 1 

   

,计

、层

、内

损伤变量

CSDMG

damage variable for cohesive

surfaces

)(取

0 ~ 1

,意

1. 1

)等

的轨道板与

CA

线

,虚

线

16 + 16 + 10

(5)

西

 

 

 

 

 

 

 

53

A + B + C +

…的

,以

:升

1 ℃

,层

,剪

(自

)最

,往

;当

5 ℃

,无

,自

,而

,说

,承

;当

10 ℃

,无

,而

,层

;当

15 ℃

,无

,且

,层

,结

,层

进一步扩展

,但层间并未开裂

,轨道依然保持

)升

1 ℃

)升

5 ℃

)升

10 ℃

)升

15 ℃

5 

Fig. 5  Shear failure process of track interface under temperature load

   

,层

,且

,提

10 m

CSDMG

,如

6.

:植

,尤

;以

,层

10. 5 ℃

22. 1 ℃

110. 5%

;距

,层

,而

线

:无

,在

10. 5 ℃

,轨

;当

10. 5 ℃

,层

,轨

,轨

;当

(本

)密

,实

线

,伸

,轨

;有

,在

22. 1 ℃

,轨

,表

16 +

(6)

,等

:不

16 + 10

;当

22. 1 ℃

,轨

,说

,有

)端

)距

2 m

)距

6 m

)距

10 m

6 

CSDMG

线

Fig. 6  CSDMGtemperature curves at different positions

7 

线

Fig. 7  Slab longitudinal displacementtemperature curve

   

2. 2 

   

13

,如

10 m

CSDMG

:随

,层

,而

10 m

;在

,从

,再

3 

Tab. 3  Preliminary designed arrangement schemes of embedded steel bars

× × × × × × × 0 1 8 × × × × × × 8 2 8 8 × × × × × 16 3 10 8 × × × × × 18 4 16 8 × × × × × 24 5 16 8 8 × × × × 32 6 16 10 8 × × × × 34 7 16 16 8 × × × × 40 8 16 16 10 × × × × 42 9 16 16 10 8 × × × 50 10 16 16 16 8 × × × 56 11 16 16 16 10 8 × × 66 12 16 16 16 16 10 8 × 82 13 16 16 16 16 16 10 8 98

;在

10 m

,从

(7)

西

 

 

 

 

 

 

 

53

,而

11

:轨

,往

,往

,这

,没

,避

,如

,也

)轨

)距

10 m

8 

CSDMG

线

Fig. 8  CSDMGtemperature curve under different arrangement schemes of embedded steel bars

线

:在

13 ℃

,各

地限制轨道板位移

;升温幅度超过

13 ℃

,植

,随

,轨

;当

30 ℃

,植

,建

30 ℃

,需

10

5 ~ 45 ℃

10

,同

,随

,轨

,且

,使

9 

Fig. 9  Slab longitudinal displacementtemperature curve under different arrangement schemes of embedded steel bars

10 

Fig. 10  Maximum longitudinal displacement of slab under different arrangement schemes of embedded steel bars and temperature

,得

10 ~ 45 ℃

,如表

所示

其中

,由于升温幅度超过

30 ℃

,植

限位效果不明显

,因此未给出最佳

便

,不

,因

:升

5 ~ 20 ℃

,推

,即距离解锁自由端由近到远的第

、第

板分别植筋

16

;对于温升

20 ~

30 ℃

,建

11

,即

参照

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